Instructables

Digital Arduino Voltmeter with Temperature

Picture of Digital Arduino Voltmeter with Temperature
One of my projects required the testing of aquastats, and we needed to monitor voltage (12-14vac) as well as temperature. I originally started with a TMP36 analog temperature sensor, but was unhappy with the output. It varied a few degrees every few seconds with no  obvious change in the environment. I changed it out for a DS18B20 didgital sensor. I offer both versions here for your enjoyment.

For more info on this and other related projects see:

http://arduinotronics.blogspot.com/2011/03/monitoring-voltage-of-dc-battery-supply.html

http://arduinotronics.blogspot.com/2012/04/voltage-monitor.html

http://arduinotronics.blogspot.com/2013/06/ac-voltmeter-and-temperature-monitor.html

http://arduinotronics.blogspot.com/2013/06/volt-meter-temperature-monitor-part-2.html
 
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Step 1: The case

Picture of The case
I dug out an appropriate case from the dumpster, milled out a rectangular hole for the lcd, and drilled holes to mount the LCD and the Arduino. I used brass standoffs and fiber washers to prevent shorts. Then I gave the whole case a quick spray of flat black to cover the scratched and scraped gray that originally covered the case.