I am using a small microcontroller with 5V output lines to try to turn a relay on and off.
I tried to follow an Arduino tutorial and I've almost got the setup working...
I say almost because the relay IN line doesn't seem to get enough power, and the Green LED on the module that indicates the IN line's voltage is very dim.
I tested the module by putting the IN line directly on the 5V input, and it seems to work fine.
I made a video that explains and demonstrates the problem
You can also connect an external power source to the microcontroller, and I tried that, too, with similar results
Can anyone help me understand why the relay doesn't work when hooked up to the 5V output line of the microcontroller?
Attempt at drawing out configuration in first video, where the A* microcontroller is getting 5V of power from its usb plug:
Attempt at drawing schematic of video 2
Attempted schematic for a new 3rd video, trying to power the relay separately.
Actually got it working with 2 pins in this 4th video
Does this mean that the problem was current all along?