Arduino Ohm Meter
|ResistorMeter.pde version: 2011-05-04||2.07 KB|
After my old trusty analog multimeter's 0Ω adjust pot stopped working I had no reliable way to measure my resistors.
I thought I could built one with my just-bought arduino and learn some arduinish along the way.
Unfortunately in the cost is not included the lcd display (it was purchased something like ~10 years ago with the Basic Stamp II) and the 7404 (it was included in the "kit" that DeAgostini made available ~5 years ago as a magazine series).
The only problem I encountered was that my serial lcd display (seetron bpi-216) uses inverted TTL signals for its serial communications. So here comes the 74HC04N to the rescue.
19th April 2011
I was looking for a way to auto-zero the device, but nothing came to mind.
I even thought of using a Wheatstone Bridge, but that needs 3 known resistor values to do the calculations.
19th April 2011 - Update 2
By mistake the wrong version of the software got uploaded.
4th May 2011 - Update
Software update to final version.
Removed debuggin Serial communication and added "normal" Serial communication for future Processing usage (maybe).
24th January 2014 - Update
Uploaded schematic in image format (.pdf) upon request.