Topic: Power problems
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Aug 22, 2019, 03:54 am
Hey Helpful people
I've attached to videos to try to describe what our issues are. Basically if the Arduino is plugged into the computer with a with a 12v battery pack powering the led's it works. BUT when we try to run it without the computer and have a 9v battery plugged into the board and 12v powering the led's, the Arduino board lights up showing it's turning on but the led lights have no sign of life.
We're desperate for help as the work is due next week and also a presentation tomorrow night. So any help would be super appreciated.
Attached is a video of it circuit working correctly when connected to computer, a video demonstrating our problem and also a wiring diagram
The last thing you did is where you should start looking.
Re: Power problems
Aug 22, 2019, 04:05 am
: Aug 22, 2019, 04:05 am by larryd
Show us a 'good' schematic of your circuit.
Show us a good image of your wiring.
Give links to components.
Forget about using dropbox.
Double check your grounds.
Check for broken jumper wires.
Use a DVM to confirm supply voltages at all points
example: 3.3v and 5v Arduino pin, power rails . . .
No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.
Design and Repair of industrial control systems.
Electronics Engineer/Industrial Control
Re: Power problems
Aug 25, 2019, 01:07 pm
: Aug 25, 2019, 01:08 pm by TomGeorge
In the first video, where does the 12V from your battery pack go to on the UNO board.
Your "circuit" diagram does not show where 12V positive of the battery is connected to
of the UNO.
Do you have a DMM to measure voltages around your circuit?
You seem to have all the gnds connected on each protoboard and the UNO, but no connection for the 12V battery positive to connect to
on the UNO.
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Everything runs on smoke, let the smoke out, it stops running....