I'm currently having trouble with my relay, and I suspect it's a problem with my setup. Here's how I have it setup.
I have a raspberry pi 3 B. I want to power something using the 5V output, so I have bought this relay.
Right now I have the relay powered to
VCC -> 5V / GPIO 2
GND -> GND / GPIO 39
SIG -> pin 7 /GPIO 4
I know the relay is powered since the D0 light has turned blue to indicate it is on.
I am running a python program to power HIGH GPIO 4 for 5 seconds, then LOW for 5, and loop.
I have a bubble machine that I'm trying to power from the raspberry pi, and have tested it's red line & GND line is working by hooking it up straight to the Raspberry PI directly and it turning on.
So, even if I have gotten the low/high trigger wrong, I know that the power should turn on eventually.
Here's my problem. When running the python script, I hear the "click" of the system, and a red light turn on. No matter what though, I never get any voltage when I hook the power line of the bubble machine to the outputs (shown on photo). I have tried just tapping it with the metal end on the wire for all 3, I have un screwed and rescrewed it into the openings, and even tried tapping the wire to the soldered points on the bottom.
What am I doing wrong? Which of the three points should I be expecting to send out 5V for the machine? Am I assuming correctly that it will output 5V?