Full disclosure: I'm a beginner electronics enthusiast. Here is my setup:
(1) Arduino Nano
(1) Arduino 24v 3 amp Relay Shield
(1) MR5A001A1 12v 30 amp Relay from an Isuzu Rodeo
(1) ATX Power Supply Model ATX-1956D
(1) 12v 50w Halogen Light Bulb
So the end goal is to drive the halogen bulb with the Arduino. Be able to turn it on and off as needed. For my first setup, I connected the Arduino to the relay shield, ran a 12v line from the power supply unit to the common on the relay, and the NO from the relay to the halogen bulb. I did not take the amps of the bulb into account at first but soon realized my mistake when the relay fried. I replaced the Arduino relay and the PSU just to be sure and added the car relay. My current setup is Arduino Nano connected to the Arduino relay, one 12v line from the PSU is connected to the common on the Arduino relay, the NO on the Arduino relay is connected to the trigger(?) of the car relay, one 12v line from the PSU is connected to the common on the car relay, and the bulb is then connected to the NO of the car relay. The Arduino and the Arduino relay shield are both powered from a 5v line from the PSU.
The issue I'm having is when the Arduino relay switches on and turns on the car relay, the PSU just shuts down. Now, I can power the bulb directly with the PSU, no problem. But when connected up in this setup something's causing the PSU to shut off. Strangely enough, If I connect the bulb to the NC of the car relay, the bulb powers up with no problem. Then, as expected, when the Arduino relay switches on the car relay, the bulb goes off, but when the Arduino relay switches off and turns off the car relay, activating the NC of the car relay again, the PSU immediately shuts down like before.
Anyone have any ideas or suggestions about this? All the parts seem to be in order. There's not too much voltage going into any part and, now, all the parts should be able to handle the amperage with the PSU being more than enough to power the whole system. What am I missing here?
