Milliohmmeter Case

thingiverse

This is a challenge for a precision millivoltmeter panel that measures the voltage drop across a resistor to be measured. The constant current source is powered by 12V from a barrel jack. You can choose another voltage, but it might not be high enough for the current source to push its 100mA through the load (the resistor). This problem occurs with larger resistances. Since the current through the resistor should be 100mA, you have to multiply the reading by 10 to get the resistance in ohms. I was inspired by this video: https://youtu.be/ReHFli7gAq4. Instructions for the electrical part are available in the video. If you want to build a significantly better version of this, watch this video series: https://youtu.be/anE0jDeBuxo. I purchased my meter from here, and it seemed well-calibrated upon arrival: https://www.aliexpress.com/item/Mini-Digital-0-36inch-LED-Display-5-Bits-DC-0-33-000V-Voltmeter-Panel-Volt-Voltage/32898586722.html. If you build this project and want to give me something back in return, I'd be extremely happy to see a post under "Makes"!