11/19/2023 0 Comments Arduino relay timer code![]() If for example you want to only perform a certainĪutomation if a certain complex formula evaluates to true, you can do that with templates. With templates inside ESPHome, you can do almost everything. For the cases where the “pure” YAML automations don’t work,ĮSPHome has another extremely powerful tool to offer: Templates. They’re a powerful tool to automate almostĮverything on your device with an easy-to-use syntax. Now that concludes the introduction to automations in ESPHome. ![]() In the first example, this range is defined as “any value above or includingĦ5.0”, and the second one refers to once the humidity reaches 50% or below. That’s a lot of indentation □ on_value_range is a special trigger for sensors that trigger when the value output Sensor : - platform : dht humidity : name : "Living Room Humidity" on_value_range : - above : 65.0 then : - switch.turn_on : dehumidifier1 - below : 50.0 then : - switch.turn_off : dehumidifier1 temperature : name : "Living Room Temperature" Hopefully a bit easier to read and understand than Home Assistant’s.įor example, this configuration would achieve your desired behavior: With it, youĬan write some basic (and also some more advanced) automations using a syntax that is That’s why, starting with ESPHome 1.7.0, there’s a new automation engine. Ideally the IoT should work without an internet connection and should not break with You could write an automation to do this task in Home Assistant’s automation engine, but That’s why you haveĭecided to also install a simple push button next to the dehumidifier on pin GPIO4.Ī simple push on this button should toggle the state of the dehumidifier. But in many cases,Ĭontrolling everything strictly from the frontend is quite a pain. Of the dehumidifier in your living room from Home Assistant’s front-end. With this file you can already perform some basic tasks. ![]() For example, if it is to supply a heating resistor, it is better to have the circuit open if the relay does not work correctly anymore.Switch : - platform : gpio pin : GPIO3 name : "Living Room Dehumidifier" binary_sensor : - platform : gpio pin : GPIO4 name : "Living Room Dehumidifier Toggle Button" When the relay is activated, the circuit will open, and the connected device will no longer be powered.Ĭhoosing the least dangerous mode is safer in case of a control failure (or if the relay is out of service). On the other hand, by choosing the terminals COM and NC, the circuit will be closed by default (when the relay is not activated): the device is switched on. The circuit will be closed only when a signal is sent to the relay. By choosing NO, the relay will be open by default (the electrical circuit will not be closed). The device in the circuit will be connected to the terminal COM and NO or NC depending on your application. ![]() NO → Normally Open: Normally Open contact. The relay has a 3-pin terminal block on the power side:ĬOM → the middle pin is called common (COM). ![]() The last pin, represented by -, is the ground connected to a pin GND. The middle pin is the power supply connected to the 5V of the ESP32 (3V3 if it is the SRD- module 03VDC -SL-C). It allows sending a signal to drive the relay. The pin S, on the left, is connected to a pin of the ESP32 (here GPIO32 ). On the model SRD-05VDC-SL-C, there are three pins to drive the relay: So if you plan to drive several power circuits separately in one project, it is more interesting to take a multi-relay module. Generally, they come in 2 categories: a module with a single relay and another with several relays simultaneously. In most Arduino kits, the modules use the SRD-05VDC-SL-C from the manufacturer Songle. Very briefly, it’s a mechanical switch that you control via the ESP32 to turn on/off a strong DC electrical circuit (RGB led strips, pumps) or a device connected to the 220V mains (fans, lights, heater, motor…). In that case, you should consult a:ref:` more theoretical article on how a relay works `. Suppose you have never used a relay before or are curious to understand how it works, its use cases and its limitations. I strongly encourage you to take a ready-made module that integrates the relay with its minimal circuit rather than using the relay alone and making the circuit for the logic part yourself (the relay itself does not fit on a breadboard and should not be put on it anyway). ![]()
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