2pcs DC 5V Relay Module 4 Channel Relay Board Shield with Optocoupler Isolation Suport High/Low Level Trigger

I've been using these [opto isolated relay modules] for years! Like being able to select Hi or Low triggers and, if necessary, isolate the board power from the relay drivers.

Works as advertised. I do like the ability to change the control input from either a hi or lo signal to control the relays. Most only work with a hi control input.

Found these on Amazon to go with the Elegoo UNO R3 controller. The set that came in the "starter kit" had pins to activate the relays and that didn't seem to secure. These have screw terminals. These also have a high/low activation setting so you can switch the high/low back and forth. I would suggest that if you need relays, these will be a better choice.

Worked fine with 3.3V pico on test

Nice to be able to switch logic levels.

The board performed as expected. It was quite simple to figure out how the board works, and how to make the necessary connections.

This relay board has a small footprint yet includes the all-important jumpers to select high or low trigger input. This will save you the headache of changing your circuit and only cost a little extra. The small Screw terminals are kind of average among brands. They are undersized for the wire size that fits compared to the amperage rating on the relay.

Both of these and a 4 pack of 2 relay boards all found with good solder connections and working perfectly.