Can ESP32 drive 5V relay?

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.

Table of Contents

How do I power a relay module with Arduino?

The connections between the relay module and the Arduino are really simple:

GND: goes to ground.
IN1: controls the first relay (it will be connected to an Arduino digital pin)
IN2: controls the second relay (it should be connected to an Arduino digital pin if you are using this second relay.
VCC: goes to 5V.

How do you trigger an Arduino relay?

Just start by defining the digital pin number 2 of the Arduino as the Relay pin. Then define the pinMode as OUTPUT in the setup section of the code. Finally, in the loop section we are going to turn on and off the relay after every 500 CPU cycles by setting the Relay pin to HIGH and LOW respectively.

Can I power ESP32 with 3.7 V?

No. Well you can’t really, the ESP32 has a VCC of 3.3v, the LiPo will vary between 3.7v-4.2v and the internal regulator requires more than the 3.7v minimum. So No. the easiest is to use a converter like a MT3608.

How many relays can an Arduino control?

For example, Arduino Uno has 14 digital pins (D0 to D13) and 6 analog input pins ⇒ Arduino Uno can control up to 20 LED or relays.

Can Arduino drive 12V relay?

Yes, I’m quite sure you can use this with an Arduino. The module has a relay with 12V coil, so a separate 12V power supply is needed. It’s a good thing to have a separate supply anyways, because if you’re controlling a higher voltage AC load, the added opto isolation gives a much needed benefit.

Can I use a Mosfet instead of a relay?

A MOSFET relay offers superior performance to an electromechanical relay in many applications. It is a solid-state device that replaces a coil-activated mechanical switch with an optically isolated input stage driving a MOSFET.

Will 3.3 V trigger a 5V relay?

Most likely the 3.3v pin cannot provide sufficient power (even stepped up to 5V) to activate a relay. It sounds as though you have a 5V supply available. A transistor is a cheap and easy way to send supply voltage to a relay coil (as suggested in post #7).