Raspberry Pi's GPIO are 3.3V so it may not be able to activate a 5V relay.
Max total current out of Raspberry Pi GPIO pins is 50 mA, while "each one [relay] needs 15-20mA Driver Current".
This means you need something in between the RPi and the relays, something that triggers to high at around 3V, and outputs 5V with enough current to pull the relays.
If you search the forums you'll find solutions on how to put transistors and diodes (important, but the relay board seems to have protective diodes already in place) between the RPi and the relay.
Max total current out of Raspberry Pi GPIO pins is 50 mA, while "each one [relay] needs 15-20mA Driver Current".
This means you need something in between the RPi and the relays, something that triggers to high at around 3V, and outputs 5V with enough current to pull the relays.
If you search the forums you'll find solutions on how to put transistors and diodes (important, but the relay board seems to have protective diodes already in place) between the RPi and the relay.
Statistics: Posted by deepo — Sat Jan 13, 2024 12:57 pm