Add/Rename item in Cookbook (#2821)
* Add/Rename item in Cookbook Made a "Lambda Magic" cookbook item, where we can gather interesting Lambda implementations. * Update lambda_magic.rst * Update lambda_magic.rst * Update lcd_display.rst
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H. Árkosi Róbert
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@ -266,6 +266,7 @@ See Also
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- :doc:`/components/switch/gpio`
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- :doc:`/components/binary_sensor/gpio`
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- :ref:`LCD Menu <lcd_menu>`
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- :ref:`Add pages to LCD display <lambda_magic_pages>`
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- :doc:`/components/pcf8574`
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- `HD44780U (LCD-II) datasheet <https://www.sparkfun.com/datasheets/LCD/HD44780.pdf>`__
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- `Charset cheatsheet <https://user-images.githubusercontent.com/1550668/173113487-9c98e866-8ee4-4a3c-a83f-61fe62057c5f.png>`__
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@ -1,10 +1,109 @@
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Custom UART Text Sensor
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=======================
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Lambda Magic
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============
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.. seo::
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:description: Instructions for setting up a custom uart text sensor.
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:description: Recipes for various interesting things you can do with Lambdas in ESPHome
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:image: language-cpp.svg
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Here are a couple recipes for various interesting things you can do with :ref:`Lambdas <config-lambda>` in ESPHome.
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These things don't need external or custom components, and show how powerful :ref:`Lambda <config-lambda>` usage can be.
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.. _lambda_magic_pages:
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Display pages alternative
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-------------------------
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Some displays like :ref:`lcd-pcf8574` don't support pages natively, but you can easily implement them
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using Lambdas:
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.. code-block:: yaml
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display:
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- platform: lcd_pcf8574
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dimensions: 20x4
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address: 0x27
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id: lcd
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lambda: |-
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switch (id(page)){
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case 1:
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it.print(0, 1, "Page1");
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break;
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case 2:
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it.print(0, 1, "Page2");
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break;
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case 3:
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it.print(0, 1, "Page3");
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break;
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}
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globals:
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- id: page
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type: int
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initial_value: "1"
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interval:
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- interval: 5s
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then:
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- lambda: |-
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id(page) = (id(page) + 1);
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if (id(page) > 3) {
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id(page) = 1;
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}
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.. _lambda_magic_udp_sender:
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Send UDP commands
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-----------------
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There are various network devices which can be commanded with UDP packets containing command strings.
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You can send such UDP commands from ESPHome using a Lambda in a script.
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.. code-block:: yaml
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script:
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- id: send_udp
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parameters:
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msg: string
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host: string
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port: int
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then:
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- lambda: |-
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int sock = ::socket(AF_INET, SOCK_DGRAM, 0);
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struct sockaddr_in destination, source;
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destination.sin_family = AF_INET;
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destination.sin_port = htons(port);
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destination.sin_addr.s_addr = inet_addr(host.c_str());
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// you can remove the next 4 lines if you don't want to set the source port for outgoing packets
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source.sin_family = AF_INET;
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source.sin_addr.s_addr = htonl(INADDR_ANY);
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source.sin_port = htons(64998); // the source port number
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bind(sock, (struct sockaddr*)&source, sizeof(source));
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int n_bytes = ::sendto(sock, msg.c_str(), msg.length(), 0, reinterpret_cast<sockaddr*>(&destination), sizeof(destination));
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ESP_LOGD("lambda", "Sent %s to %s:%d in %d bytes", msg.c_str(), host.c_str(), port, n_bytes);
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::close(sock);
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button:
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- platform: template
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id: button_udp_sender
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name: "Send UDP Command"
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on_press:
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- script.execute:
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id: send_udp
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msg: "Hello World!"
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host: "192.168.1.10"
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port: 5000
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Tested on both `arduino` and `esp-idf` platforms.
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.. _lambda_magic_uart_text_sensor:
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Custom UART Text Sensor
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-----------------------
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Lots of devices communicate using the UART protocol. If you want to read
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lines from uart to a Text Sensor you can do so using this code example.
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@ -87,8 +186,7 @@ And in YAML:
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text_sensors:
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id: "uart_readline"
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Example usage
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-------------
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**Example usage**
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Here is an example switch using the uart text sensor to set switch state.
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@ -123,4 +221,7 @@ See Also
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- :doc:`/components/uart`
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- :doc:`/custom/uart`
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- :ref:`lambda <config-lambda>`
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- :ref:`automation`
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- :ghedit:`Edit`
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@ -789,7 +789,7 @@ Cookbook
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ESP32 Water Leak Detector, cookbook/leak-detector-m5stickC, leak-detector-m5stickC_main_index.jpg
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BME280 Environment, cookbook/bme280_environment, bme280.jpg
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Time & Temperature on OLED Display, cookbook/display_time_temp_oled, display_time_temp_oled_2.jpg
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Custom UART Text Sensor, cookbook/uart_text_sensor, language-cpp.svg
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Lambda Magic, cookbook/lambda_magic, language-cpp.svg
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Endstop Cover, cookbook/endstop-cover, window-open.svg
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Non-Invasive Power Meter, cookbook/power_meter, power_meter.jpg
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Sonoff Fishpond Pump, cookbook/sonoff-fishpond-pump, cookbook-sonoff-fishpond-pump.jpg
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