Current and Relay Help

Hey,
I am currently turning on a heater,pump and fan with 5V relays. I am using a bi directional logic converter to convert the 3.3v from the photon to 5v to relay signal. ( I have 3 relays being turned and on and off in a cycle). All of this is getting powered by the Yw robot breadboard powersupply. The circuit works fine when there are 2 relay on, but when the 3rd relay is turned on (pump), the photon crashes. Anyone got any suggestions on how to fix this?

What is the current draw of your relays and what’s the power output of your supply?
If your supply is the one that I found googling (providing links is usually prefered) then it can only supply max. 700mA.
With the Photon using 300mA (on WiFi connect even more) you haven’t got a lot of room to drive the relay coils.

1 Like

I think the relays draw 70-100ma each. So ill try power them with a seperate power supply.

Cheers

1 Like

It worked! thanks @ScruffR

1 Like