I have a question with the $50 robot circuit - the LED does not light when the microcontroller is installed and 7 V is connected, and I have no voltage across the VCC and the PD4 pin. Should the LED light when voltage is applied to the finished circuit before programming?
I have checked the following with my circuit:
-All connections seem to be correct when I checked with a voltmeter.
-I have 4.95 V on the microcontroller circuit past the regulator.
-The LED lights when 7V is applied directly to the LED sub-circuit without the microcontroller installed. The LED circuit between VCC and PD4 is good and has a ~ 1V drop.
- The LED is installed correctly with the positive end on the VCC side.
Do I need to wait until it is programmed to have a voltage across PD4 and VCC?
Thank you in advance!