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.

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Step 1: 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.
<p>Can it work on AC 110V(Home Electric)?</p>
<p>Yes, just set your voltage divider to provide 5v @ 140 v max scale.</p>
<p>is this voltmeter have a feature of Auto-ranging???</p>
It uses a voltage divider, so it can measure whatever max your voltage divider is set for. You could add manual ranges with additional resistors.
<p>hi ..i am doing the same project my design a little different may i ask u some qustions in ur project how can i contact u ?</p>
email me at greentrust@gmail.com

About This Instructable




Bio: Professionally, I'm an IT Engineer (Executive Level) and Electronics Tech. I'm a Amateur Radio Operator (KK4HFJ). I lived off grid, with Solar (PV ... More »
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