3.3V difference between Uno and MKR

Using Arduino Project Guidance
1

Hi

I need to control 5 relays with an MKR 1400. I can control them with a Arduino UNO using a 3.3 V but with MKR 1400 the relays do not turn on. Do i need to add something to the project to control it? Thanks in advance.

2

Please post a link to the relay, or its data.

3

A wiring could also be helpful.

4

Probably some type of driver or buffer.

5

The relays are this:

The wire is this (for the MKR 1400):

I test again with 1 relay and works fine, but when i increase 2 or more relays to the circuit they don't turn on. Would a logic signal converter resolves my issue?

logic signal converter:

6

7

Idahowalker, any sugestion how to solve this? Thanks

8

Do you have the bare relays, or the ones you linked to which appear to have some driver circuitry?

Do you know the "5" refers to the coil voltage, 5 volts? It is odd they work at all with 3.3.

And you can't power them like that off the Arduino board, you need a separate more adequate source of 5 volts for the relays and some of the standard method for driving a relay with an Arduino output pin, which you can google a variety of, at least a transistor, a resistor and a diode.

Here, let me google that for you:

https://forum.arduino.cc/index.php?topic=197898.0

HTH

a7

9

Just add add a external power supply and it's working

thanks to all

10

petersain:
Just add add a external power supply and it's working

thanks to all

Glad you figured out how to solve Scotty's problem.

You are welcome.

11

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.