Hi Everyone,
I'm trying to use this relay board in my project and have accidentally gotten it to work, but would like to confirm that I'm not damaging my Netduino if I leave my current configuration alone.
I'm using the following relay board:
http://www.sainsmart...-ttl-logic.html
Basically here's the process I followed:
1. Wired the 3.3V output of the Netduino to the 5V of the relay board's input (I read that this should be enough voltage to trigger the relays)
2. Wired the GND to GND, and desired outputs to the desired relay board's inputs
3. Wrote up the code.
4. Plugged in the Netduino through USB and powered the relay board only to find the LED on the Netduino flashing weirdly (seemed like it was in some type of error state).
5. Unplugged the Netduino USB and reset and discovered that all of a sudden my code was working and the relays were switching
It appears I made a false assumption that the relay boards inputs were isolated from its power supply and that the relay board is somehow powering the Netduino.
So I'm just wondering if this is bad for the Netduino, meaning that I should wire together some opto-isolators (or a shift register [color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]74HC595? can anyone confirm that this would isolate the Netduino?) to properly isolate the Netduino.[/color]
[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Thanks[/color]