Asked
Resolved by DJ Sures!
Anyone know of a good way to monitor power of the battery and feed voltage into ARC so I know when PC Is about to die? I monitor Power of EZB but I can't monitor power PC has. I share the same 12v battery for PC, Servo's EZB etc but I keep voltage at 7.5v for EZB with a voltage regulator and for the PC I use a step up converter. Step up converter starts to fail around 10.5v but EZB is still happy and doesn't record a voltage drop. End Result is PC on robot dies without making it back to dock on time to recharge battery.
Note: I used prevent PC sleep as question but really it is pc shutdown due to no power. I selected Rock PI X but using NUC but assume relevant.
Related Hardware Rock Pi X
Related Control
Prevent PC Sleep
I don’t think you need to set up. The rock pi x only requires 5 volts.
The ezb adc port can monitor the voltage of you decide to continue using the step up. You’ll need a voltage divider circuit and voila
I only had choice to select Rock PI (yes maybe a bad selection) but as per comment I am using a NUC and that is 19v
Oh and the nuc needs 11v? Won’t run off 5?
then voltage divider to ARC it is
Check this out: https://ohmslawcalculator.com/voltage-divider-calculator
Not my area of expertise, but don't voltage dividers lose a lot of power to waste heat compared to a buck converter? I imagine for a micro computer you don't need to worry too much about not being able to pull enough amps.
Alan
Today I have the following 12 volt battery driving the EZB with a voltage regulator that reduces voltage to 7.5v because my servo's run at 7.5v. I have a Boost converter to PC that increases voltage to 19v because the NUC prefers 19v. The NUC will die when voltage drops below 14v especially when using Cameras etc. So what I need is a way to measure the voltage coming into the PC to know when it drops below say 16 volts so the Robot knows to go back to the charger.
You need a voltage divider LOL
no current is being consumed. Make a voltage divider with the link I found and pasted for you. Connect it to ezb adc
This is an option and we can modify the arduino code to shut down the PC or send robot home to charge. It is also a voltage divider. The LCD is optional.
https://www.electroschematics.com/arduino-digital-voltmeter/