Hello! I am a newbie on arduino. I would like to ask if what I want to implement is possible with Arduino. I would like to build a voltmeter wherein the LED will also tell me PASS/FAIL conditions.
For example, I would like 2 conditions.
≤100Vdc = PASS
< 100Vdc = FAIL
Is this possible to be done? I've read that it can be implemented using Voltage Divider and an Opto-isolator. I am very grateful for the guidance I would be given through this forum. Thank you.
Maybe you could explain
Below 100 is a fail, above 100 is undefined state..
A voltage divider might be your solution, but the logic needs clarification.
Hello! I appreciate your reply. This voltmeter is used in an ESD Safety Application and is defined by industry standards. To simplify it, it says that when the body voltage is less than or equal 100Vdc, it is safe to handle Electrosensitive Devices. If it is more than 100Vdc, it is no longer safe to handle Electrosensitive devices since ESD will take place. Our upper limit is set to 250Vdc since that is also the upper limit of our scope.
I am considering the voltage divider concept since the sensor I encountered that can measure up to 250Vdc (Yoctovolt) is not available in my country. However, is doing voltage divider with arduino dependable?
Dependable - yes as long as you implement and observe circuit protection
Over voltage on pins etc… common 0V / ground.
Hi,
Your device will have to be of extremely high input impedance, as an ESD charge is usually very high impedance source.
Just measuring the ESD voltage could decrease its measured value, bringing it into the safe range even if the non test value exceeds the threshold level.
Have you Googled;
measuring ESD voltage
Tom... 
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