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How do you control a relay module with an ESP32?
The code to control a relay with the ESP32 is as simple as controlling an LED or any other output. In this example, as we’re using a normally open configuration, we need to send a LOW signal to let the current flow, and a HIGH signal to stop the current flow.
How do you control a relay module?
Controlling a relay module with the Arduino is as simple as controlling an output – you just need to send HIGH or LOW signals using an Arduino digital pin. With the relay module you can control almost any AC electronics appliances (not just lamps).
What kind of voltage does the ESP32 relay module control?
It can be controlled with low voltages, like the 3.3V provided by the ESP32 GPIOs and allows us to control high voltages like 12V, 24V or mains voltage (230V in Europe and 120V in the US). There are different relay modules with a different number of channels.
Do you need a GND for an ESP32 relay?
Also, both devices need to have a common GND. Depending on the ESP32 board you are using, it may have an output pin that can be used to power the relay with 5v. Nonetheless, if you are not sure of the maximum current draw it can provide from this pin, it is safer to use an external power supply.
Can a relay module be powered by 5V?
There are relay modules whose electromagnet can be powered by 5V and with 3.3V. Both can be used with the ESP32 – you can either use the VIN pin (that provides 5V) or the 3.3V pin. Additionally, some come with built-in optocoupler that add an extra “layer” of protection, optically isolating the ESP32 from the relay circuit.
What kind of power supply do I need for Arduino relay?
When we use an ESP8266 or ESP32 microcontroller with an operation voltage of 3.3V, we have to use the VIN or 5V output from the USB connection as power supply for the relay module and power the ESP8266 or ESP32 board via USB. The following picture shows the wiring between the most used Arduino, ESP8266 and ESP32 microcontroller and a relay module.