Esphome lambda examples. The new value is available to lambdas in the x variable.

Esphome lambda examples. !lambda tells ESPHome that the following block is supposed to be interpreted as a lambda, or C code. io Mar 14, 2025 · Hello, I’m trying to use EspHome help or research on internet to understand how to use the Addressable Lambda Effect. I want to update thew code so that the screen backlight stays on if an input boolean helper in HA is set to on and reverts back to turning off automatically if the helper is off The original code is: - interval: 45s then: - if: condition: - lambda: |- return !id(recent_touch); then: light. Template Valve The template valve platform allows you to create simple valves out of just a few actions and a value lambda. I have seen that there’s a function set() to allow setting one without using a lambda. It should serve as a means of finding inspiration for new projects and finding other ESPHome-enthusiasts on the web. You can then get the current time in lambdas. Possible return Jul 18, 2025 · Raw . rotation (Optional): Set the rotation of the display. filled_circle(25, 25, 10); e. What I do not see, and can’t find, is how to use the current value of a global variable. I tried a binary sensor but Global Variables In some cases you might need to share a global variable across multiple lambdas, or to remember between periods of deep_sleep. Thanks for the help! MQTT Client Component The MQTT Client Component sets up the MQTT connection to your broker. ” object? Like, can I rotate one line of text to 45°? Or any other SSD1306 OLED Display Over I²C The ssd1306_i2c display platform allows you to use SSD1306 (datasheet, Adafruit), SSD1305 (datasheet), SH1107 (datasheet, Adafruit) and SH1106 (datasheet, electrodragon) displays with ESPHome. A more complex example follows: Jul 27, 2020 · Using your example I was able to clean things up a bit too and was able to accomplish what I was aiming for without the intermediate sensor or switch. springgreen. You may also use any of the standard CSS color names, e. Contribute to jgruen/ESPHome-custom-addressable-lambdas development by creating an account on GitHub. For example, if you want to only perform a certain automation if a certain complex formula evaluates to true, you can do that with templates. Aug 14, 2022 · Lambda Function for Delay? Need help to increase time delay by an automation - esphome Lambda value on delay: Completely configurable timers I have a few use cases that can’t be solved with basic lambda functions; I need to be able to adjust the delay timer dynamically - ideally through the Home Assistant web interface. A “|- “ character combination tells the YAML parser to treat the following indented (!) block as plain text. The new value is available to lambdas in the x variable. Apr 11, 2021 · The insight about how ESPHome works (your description of the loop and what happens during that loop including and lambda code we write) Why calling the Arduino method f/ a lambda would delay everything in ESPHome (which would change expected behavior) How the YAML delay action works (and doesn’t actually stop execution) Dec 13, 2021 · For some time, when I needed to call a method on my custom component from a lambda function, I used a complicated typecasting macro I saw on an example that goes like this (custom cover component): #define get_am25 (const&hellip; json Component The json component enables ESPHome to work with JSON data in automations, sensors, and HTTP requests. I would like to have some reusable functions that I can call in lambda’s. When either one satisfies and comes out of heat or cool, it shuts off the heat command. yaml / wifi. lambda (Optional, lambda): Lambda to be evaluated every update interval to get the current option of the select. print(. See the full code and template for ESPHome Sprinkler Controller with D1 Mini. set_action (Optional, Action): The action that should be performed when the remote (like Home Assistant’s frontend) requests to set the dateime value. Base Output Configuration Each output platform extends this configuration schema. Jun 15, 2022 · This looks like an ideal place to use a lambda - a chunk of code written in C (++) that gets inserted by the YAML-to-C conversion process that occurs during the ‘compile’ phase of ESPHome processing. The condition may be expressed as a C++ lambda, or as a YAML expression. It contains ways to use the time component in automation. I just cannot wrap my head around the more advanced lamda stuff. But I find it very uncomfortable when you need many varriables. Display pages alternative Some displays like lcd_pcf8574 Component don’t support pages natively, but you can easily implement them using Lambdas: Oct 20, 2023 · Learn how to use lambda expressions in ESPHome to create custom logic for your devices. com Templates ¶ Templates (also known as lambdas) allow you to do almost anything in ESPHome. These templates enable dynamic sensor value generation, complex data transformations, and seamless integration with various hardware platforms, allowing precise control over sensor behavior and data Jan 13, 2024 · Lambda expressions in ESPHome enable advanced logic directly on the device. In this example I have used a SSD1306 OLED Display over I²C to show current time and two different temperature values from Home Assistant. Let me explain: I need to whenever a sensor in Home Assistant change it’s value, ESPHome should run a pre determined ESPHome script for each value from the sensor. on_turn_on (Optional, Action): An automation to perform when the switch is turned on. /. The condition expression will be evaluated continually, on each call to the component’s loop() method, which is typically every 16ms. Base Select Configuration All selects in ESPHome have a name and an optional icon. These don’t require external components and demonstrate how powerful Lambdas can be. ⚠️ Warning If you enable MQTT and you do not use the Native API Component, you must remove the api: configuration or set reboot_timeout: 0s, otherwise the ESP will reboot every 15 minutes Configuration variables addressable_light_id (Required, ID): The id of the addressable light component to use as a display. Thanks in Actions, Triggers, Conditions ESPHome actions are how we make an ESPHome device do something. A map may be updated at run time using a lambda call, e. height (Required, int): The height of the LED matrix in pixels. val value and set the sensor accordingly. Maps are stored in RAM, but will use PSRAM if available. Note that this component is for displays that are connected via the I²C Bus. The parents will Button Component ℹ️ Note To attach a physical button to ESPHome, see GPIO Binary Sensor. turn_off: id: backlight else: Jan 30, 2024 · ESPHome john273621 (john912873) January 30, 2024, 4:39pm 1 Hi, Im trying to set output. I think my project is easy : i’ve an ESP32 with a WS2812B led with 120 leds. If I could use the AddressableLight-object in the on_value-lambda of the rotary_encoder, it would not be necessary to expose the "Rotate" effect to HomeAssistant and the code could be leaner. ‘it’ is an object (display buffer, basically) defined within ESPHome and passed to the YAML-macro’s lambda on each callback. t. Binary Sensor Component With ESPHome you can use different types of binary sensors. Found something great or have something to share? The usual rules of don’t Template Binary Sensor The template binary sensor platform allows you to define a boolean condition and use it to provide a binary sensor. I have everything setup great except when both climate entities are calling for heat or cool. set_action (Optional, Action): The action that should be performed when the remote (like Home Assistant’s frontend) requests to set the Select option. This page purposefully has little moderation. There are no examples in the documentation and nothing clear when I search for it. You can directly define the payload by adding data to payload then the return value is ignored and the content of payload is used. It’s incredibly difficult to find coding examples for esphome yaml files. What are these types of lambda expressions called in C++, so I can do some research into them? Stuff like the double colon and “pushback” for example. A select entity is basically an option list that can be set by either yaml, hardware or the user/frontend. Once defined, it will automatically appear in Home Assistant as a valve and can be controlled through the frontend. It allows selection of the I²C address. Jun 18, 2021 · Hi ESPHome Experts! I’m trying ESPHome for the last 4 days and I’ve accomplished a lot within a few hours of investigating and programming the yaml file. ESPHome Time Instructions for setting up real time clock sources in Guides In this section Changelog Command Line Interface Configuration Types Contributors Create audio clip files for use with I²S Speakers DIY Examples ESP32 Arduino to ESP-IDF Migration Guide Frequently Asked Questions Getting Started with ESPHome and Home Assistant Getting Started with the ESPHome Command Line Installing ESPHome Manually Made for ESPHome Migrating from ESPEasy Migrating Generic I²C device component General-purpose I²C device component that can be used to communicate with hardware not supported by a specific component. It's c / c++ code same as you would use in Arduino, with most of the normal formatting (mind your semicolons and parentheses. lambda (Optional, lambda): Lambda to be evaluated every update interval to get the current value of the text. write_lambda (Optional, lambda): Lambda is evaluated before the modbus write command is created. line(0, 0, 50, 50); it. Examples include calculating air quality values based on sensor readings and converting them into user-friendly classifications. Dive into the syntax of lambda expressions, learn how to create conditional logic, integrate functions, and control your devices with precision. They will automatically appear in the Home Assistant front-end and have several configuration options. The lamdba can add 16 bit raw modbus register words which are send to the modbus device. When the property is inheritable, the parent will be searched for an object which specifies a value for the property. ESPHome’s lambda expressions offer a dynamic and versatile solution, empowering you to inject tailored intelligence into your components. Can be one of date or time. For example: Dec 28, 2021 · Is there any full documentation on Lambda functions for displays in ESPhome? On this page on official site there are scattered little bits of useful things like: it. Oct 6, 2023 · In the ever-evolving landscape of smart home automation, having the ability to infuse your devices with custom logic is a game-changer. Graph Component You can display a graph of a sensor value (s) using this component. Note The examples below assume you’ve set up LVGL correctly with your display and its input device, and you have the knowledge to set up various components in ESPHome. DIY Examples This is a curated list of awesome creations with ESPHome containing various external components, blog posts, videos and sample configurations. Example: If HA lambda (Optional, lambda): The lambda to use for rendering the content on the Nextion display. Nov 29, 2020 · I am setting up a small OLED screen, and I want to show current time, and some weather conditions like current weather, wind force and temperature. See examples of inputs, outputs, conditional statements, functions, and return statements in lambda expressions. ℹ️ Note Home Assistant Core 2021. Everything you draw in lambda: will be rotated by this option. I’m not The mapping can be accessed using the id function, and the value can be looked up using the [] operator as per the above example, or the get function. May 6, 2020 · I’m experimenting with 8x8 matrices (actually I’m more of a tester) so ignore the platform:. Note that I am not using HA. If you are connecting to Home Assistant, you may prefer to use the native API, in which case this is not needed. In fact, most addressable lights are Modbus Controller Switch The modbus_controller switch platform creates a switch from a modbus_controller component and requires Modbus Controller to be configured. GitHub Gist: instantly share code, notes, and snippets. They may be read and/or written. rectangle(50, 60, 30, 42); it. . Substitutions ESPHome has a powerful way to reduce repetition in configuration files: substitutions. This is for example useful if you want to manipulate the text_sensor string in some fashion. Base Time Configuration All time configuration schemas inherit these options. Base Light Configuration All light configuration schemas inherit these options. For clockless lights, you can use ESP32 RMT LED Strip, and for SPI LEDs see SPI LED Strip Light. set("key", value). As you mentioned, there aren’t a lot of LEDs effects for ESPHome unless you know how to write customize codes using the Lambda feature and there aren’t a lot of resources online that can provide examples. Explore examples, tips, and challenges for leveraging ESPHome's scripting capabilities. This is typically empty. Can someone please point me in the right direction? I am not a C/C++ programmer and I’ve only used the Arduino IDE previously so if I need to write some C++ code, I might need a bit of a hand, sorry. Jun 22, 2019 · Hi guys. # You can modify this file to suit your needs. map. Display lambdas are additionally passed a variable called it which represents the rendering engine object. Let me know if you have suggestions! Blog post: Youtube Video: The modbus sensor platform allows you use a lambda that gets called before data is published using lambdas. For this I need many variables to May 8, 2020 · Thanks for the response. But for the last 2 days I’m stuck within a problem. payload (std::vector<uint16_t>& payload ): Empty vector for the payload. Sensor Filters ESPHome lets you pre-process sensor values before sending them to Home Assistant. It allows to navigate a hierarchy of items and submenus with the ability to change the values and execute commands. Dec 20, 2023 · I (mostly) get how you can create a custom sensor so you can display the current value of something from ESPHome to Home Assistant, but what if I want to write back to a variable for use in a lambda? For example, when c&hellip; Dec 29, 2023 · I am looking to control a Solis inverter via MODBUS without using Home Assistant. If your SSD1306/SSD1305 or SH1106 is connected via the 4-Wire SPI bus, see Over SPI. Let’s begin with an example. Template Switch The template switch platform allows you to create simple switches out of just actions and an optional value lambda. Apr 4, 2025 · This project demonstrates how to create a smart home dashboard using the CrowPanel ESP32-S3 display integrated with ESPHome and Home Assistant. How can I print the state (as text)) My first sensor below, id: current is based on sensor Jul 9, 2022 · Hello guys, I know the way to set global variables. HTTP Request The http_request component lets you make HTTP/HTTPS requests. So I am looking for help in using a lambda to look if either one is calling for heat/cool, and keep that call on. These are grouped into two categories: binary outputs (that can only be ON/OFF) and float outputs (like PWM, can output any rational value between 0 and 1). Output Component Each platform of the output domain exposes some output to ESPHome. gitignore # Gitignore settings for ESPHome # This is an example and may include too much for your use-case. Reads and writes on the device can be performed with lambdas. “Current Temperature” will NOT poll the Nextion. Sep 6, 2021 · It’s me again, feels like it at least. JSON is a syntax of For example, the component could read hardware and determine the state, or have a specific configuration option to regulate initial state. Jun 3, 2023 · So i have spent the last two evenings learning to use addressable lights within ESPHome And when it comes to light effects, most examples can be copy pasted for a quick and easy test, or just to use those. YAML is designed to be human-readable and easy to edit, but can also be frustrating to work with, in particular when it comes to indentation. I have not found anything like this. Some examples use absolute positioning for a screen with dimensions of 240x320px ; if your display’s dimensions differ, you’ll need to adjust them in order to obtain the expected results. It is very similar to the FastLED Light platform. Is there a way to define global varriables inside a lambda? And, is there a way to write/read data directly to the flash? I ask these questions because I am planning to program a light control for my aquarium. ’ For a more profound idea of what it can do you have to consult the API documentation: Light Component In ESPHome, light components allow you to create lights usable from Home Assistant’s frontend and have many features such as colors, transitions and even effects. See full list on github. ) There are few functions specific to ESPhome for reading and writing sensors, inputs and outputs, referenced by their assigned IDs within code blocks. value (int64_t ): The mapping value of x using optionsmap. I have a BMP388 and am trying that. RonnieLast (Last of the Ronnies) January 9, 2025, 10:44am 2 Hi, I was just working with parameters today and I was researching a different issue and saw your post. The individual components for the Nextion will handle almost all functions needed for updating display elements. This is particularly useful for: Processing API responses Sending structured data to external services Parsing configuration from JSON files What is JSON? JSON is a text syntax that facilitates structured data interchange between all programming languages. Nov 18, 2024 · Hi folks, I have a CYD using some code I found online which works well. This page explains both standard YAML features and ESPHome-specific extensions. You can specify update_interval, defaults to 60min. You can then execute the script from nearly anywhere in your device’s configuration with a single call. lambda (Optional, lambda): Lambda to be evaluated every update interval to get the current value of the datetime. When widgets have children, property inheritance takes place. Let’s look at an example first: Esphome Lambda Examples. Without it, the YAML parser would attempt to read the following block as if it were made up of YAML keys There should be lambda examples on the ESPhome website. I tried to modify the example from here https://esphome. In my action code a want to check a binary sensor (switch) on the Nov 23, 2024 · I’m trying to learn how to use global variables. yaml Raw cat. The example below logs the value as parsed and the raw modbus bytes received for this register range: Mar 6, 2022 · The following example shows how I got it to work with a rotary_encoder and addressable_lambda. Uses lambda for parsing and extracting data ESPHome allows you to do some basic pre-processing of text_sensor values before they’re sent to Home Assistant. Suppose you have a configuration file which contains: Discover a collection of ready-to-use ESPHome configurations for various devices, simplifying your smart home automation projects. May 16, 2023 · I’m trying to make a remote transmitter lambda call using a raw code. The new value is available Parameters passed into write_lambda x (const std::string& ): The option value to set for this Select. c But is there any full documentation on functions of this “it. Example device configs for ESPHome and HomeAssistant - c0psrul3/ESPHome-Examples Jan 14, 2024 · Where can I find resources to learn more about advanced scripting with ESPHome? There are various resources available to learn more about advanced scripting with ESPHome, including the official documentation, online forums, and tutorial videos. I had to fiddle with the figures in my Python code on the RPi so it looks similar to that. Mar 9, 2021 · Where conditionswd is previously defined from the open weather provider ie : Sep 3, 2025 · Template Text Sensor The template text sensor platform allows you to create a text sensor with templated values using lambdas. See Rendering Lambda for more information. jpg Raw Jan 9, 2025 · Other variable name, other type, Assigning it in the lambda to a temporary variable first… All with the same outcome. This sketch used to work fine, however, since I changed the lambda to include the pills section it doesn’t seem to work correctly, it should switch displays between the time and leaf unless the input_boolean on, but it’s always switching between time and tablets no matter if pills is on or off Defaults to 255. Nov 4, 2019 · My observations from working with esphome is that if I was transitioning the light say from low to half brightness and used turn_on then the light would first go immediately to full bright and then dim to half bright instead of from low to half bright. To do so, you need to add it to your device’s configuration: BLE Client allow to read characteristics from devices. The menu can be activated and deactivated on demand, allowing alternating between using the screen for the menu and other In the lambda, you can write code like in any lambda in ESPHome. Jul 17, 2023 · I made a tutorial about building an ESPHome external component for an i2c encoder. The ESPHome community is also known for being helpful and supportive, so don't hesitate to ask for assistance when needed. This time I’m trying to have ESPhome parse the below MQTT message from a temperature sensor sent by node-red and set the value of a global variable to “temperature. One of 0° (default), 90 Display Menu The component provides a menu primarily intended to be controlled either by a rotary encoder with a button or a five-button joystick controller. Some properties (typically those related to text and opacity) can be inherited from the parent widgets’s styles. timezone (Optional, string): Manually tell ESPHome what time zone to use with this ESPHome - SSD1306 display example. Select Component ESPHome has support for components to create a select entity. If you let ESPHome manage the display (and you should), then all display actions should go through ‘it. Aug 19, 2020 · I’m still very new to this and coding in general. Once defined, it will automatically appear in Home Assistant as a switch and can be controlled through the frontend. ) it. Configuration variables: id (Optional, ID): Specify the ID of the time for use in lambdas. width (Required, int): The width of the LED matrix in pixels. For example, global variables can be used to store the state of a garage door. Configuration variables options (Required, list): The list of options this Select has. There is a good example in the docs using the Pioneer protocol as show below: // Example - transmit using the Pioneer protocol auto call = id(my_transmitter). transmit(); esphome::remote_base::PioneerData data = { rc_code_1, rc_code_2 }; In the lambda, you can write code like in any lambda in ESPHome. The states used for the graph are stored in memory at the time the sensor updates and will be lost when the device reboots. The example below polls an analog sensor and YAML Configuration in ESPHome Overview ESPHome configuration files use YAML, a human-friendly data serialization standard. Lambda Magic Here are a couple recipes for various interesting things you can do with Lambdas in ESPHome. This is useful, for example, if you want to apply an average to the last few readings. ESPHome has support for several different types of displays. Examples: NeoPixelBus Light ⚠️ Warning NeoPixelBus does not work with ESP-IDF. By default, the binary will chose the appropriate device class itself, but you can always override it. esphome / / secrets. Been trying to extract UART and Modbus data without success. The value is passed in as float x and an empty vector is passed in as std::vector<uint16_t>&payload. Template Output The template output component can be used to create templated binary and float outputs in ESPHome. Modbus Function Code 1 (Read For example, 0xFF0000 would be red. 12 or higher is required for ESPHome Using the above yaml example: “Current Humidity” will poll the Nextion for the humidity. & seems to work but I had issues trying to code the additional if statements based on an external sensor. coil : Coils are 1-bit registers (on/off values) that are used to control discrete outputs. value” from the message. My elevation is 574 meters but it was a few hPa out so I used 600 meters for elevation. item (ModbusSelect*const ): The sensor object itself. This component can restore its state on reboot/reset if configured to do so. Sep 14, 2022 · Learn how to use lambda expressions to display minutes and seconds remaining for each sprinkler valve in Home Assistant. (I found this, which indicates you can only access a global variable with a lambda By default, LVGL draws new widgets on top of old widgets, including their children. I’ve seen suggestions that this is how components should be made, but I couldn’t find much documentation so I figured it out and made it. ESPHome has support for components to create button entities in Home Assistant. So far I have correctly got the ESP device reading the MODBUS registers and output-ing them to MQTT. When using a lambda to provide a color you should use the lv_color_hex function, for example: A simple DIY status display with an 8x32 RGB LED panel implemented with esphome. I’ve spent an hour or so searching for an example or clue on how one creates an ESPhome ‘if’ condition statement that contains a second ‘if’ condition inside it, and found nothing obvious. Either the Nextion will need to use the Nextion Custom Sensor Protocol or use a lambda: Lambda Calls. Configuration variables register_type (Required): type of the modbus register. set_action (Optional, Action): The action that should be performed when the remote (like Home Assistant’s frontend) requests to set the text value. Nov 18, 2021 · I have a typical furnace and ac with an upstairs and downstairs damper. Base Binary Sensor Configuration All binary sensors have a platform and an optional device class. Apr 5, 2021 · Hi all, Still very new to ESPHome and finding it a very steep learning curve. Here is a link to the explanation of the time component in ESPHome. Has anyone done it and got an example ? I’ve tried hacking at my code but get validation errors of one type or another. Template Sensor The template sensor platform allows you to create a sensor with templated values using lambdas. A button entity is represented in ESPHome as a momentary switch with no state and can be triggered in Home Assistant via the UI or automations. I’ve 4 air sensors connected to Homeassistant. In the lambda, you can write code like in any lambda in ESPHome. 8 or higher is required for ESPHome select entities to work. Oct 28, 2019 · First add this to get time from Home Assistant: # Example configuration entry time: - platform: homeassistant id: homeassistant_time Then, you’ll need to add a reference to this in the automation. custom LED lighting effects for ESPHome. Configuration variables type (Required, enum): The type of the datetime. But for the Lambda effect, some people might be scared off, by the aspect of using another Script Component ESPHome’s script component allows you to define a list of steps (actions) in a central place. Time Component The time component allows you to set up real time clock time sources for ESPHome. With substitutions, you can have a single generic source file for all nodes of one kind and substitute expressions in as required. g. I will let it run for a few days and keep track of the QNH as we have an airport about 30 kms away that reports it. set_action (Optional, Action): The action that should be performed when the remote (like Home Assistant’s frontend) requests to set the number value. I have spent a few days reading and trying to comprehend the documents, but I struggle with the Lambda stuff, I have very little experience with C++. You need to pass the arrays first, example is here: ESPHome Script Component passing Parameters ESPHome Jun 29, 2022 · Yes. Example Server The following code allows a ModBUS client to read a sensor value from your ESPHome node, that the node itself read from a ModBUS server. This sort of thing has been puzzling me too. io and Home Assistant - lubeda/EsphoMaTrix lambda (Optional, lambda): Lambda to be evaluated every update interval to get the current value of the number. set_level on motor using lambda function get states from number template. Feb 19, 2025 · Learn how to use lambda functions, script components, and external languages to create dynamic and responsive smart home solutions with ESPHome. Unless a specific platform defines another default value, the default is ALWAYS_OFF. yr_symbol_current I was hoping printf with the parameter %s would work, but unfortunately not. This article delves into the world of custom lambda expressions, explaining their significance, showcasing their real Jan 20, 2025 · ESPHome sensor templates provide developers and hobbyists with a powerful mechanism to create custom sensor configurations using flexible lambda functions and advanced processing techniques. Difference from build-in ESPHome BLE Client: Always disconnects from device after reading characteristic, this will allow to save device battery. I would like to divide my 120 leds by 4 groups of 30 leds and, when a sensor detect something wrong, color in red one of these groups. I get all to show correctly, except for the string from sensor. The new option is available to lambdas in The configuration example above creates a modbus_controller hub talking to a Modbus device at address 1 with a baudrate of 115200 bps, implementing a sensor, a switch and a text sensor. The neopixelbus light platform allows you to create RGB lights in ESPHome for individually addressable lights like NeoPixel or WS2812. Esp_logd (main, i am at execution number %d, num_executions); These things don’t need external or custom. smq23dm ztes6 xd9r tabb7nt z2ag ekvyl5 dj4aysq 40rh 8s hcvonhm