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Bluetooth Wireless Voltage Meter using Wiimote + Pic Chip + AutoIt

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In this tutorial I'm going to be showing you how you can send voltage values to your pc using a Pic chip, Wiimote, and Autoit3 scripting language. The process works by wiring a pic chip to the button pads of a wiimote. Then using the pic chips Analog to Digital Converter, we obtain a 10bit binary value. We will then send that value to Autoit in the form of button presses using the wiimote as a data interface.  On the PC side we will use a library I wrote to receive the data from the wiimote. The library is basically just a port to Wiiuse by Michael Laforest set up in a way to make scripting with the wiimote very easy. 

Most pic chips are equiped with multiple Analog to Digital channels. This lets us monitor multiple voltages values if we want to. The total amount of channels sampled will depend on different factors like how many channels the chip has. Channels are sampled one at a time so the more voltages you monitor, the less samples per second you get. 

How the Analog to Digital Converter works
The pic chip A/D Converter works by comparing the voltage you're measuring to a known voltage. In our case the known voltage is the voltage supply 5v. The 10bit value measured is a ratio of the pic chips known voltage 10bit value. So for example a sample thats 10bit value is 387, the voltage value would be V = (5v/1024) * 387    which equals 1.89v


 
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tom123il2 years ago
Thank you for this. I have been playing with 20 of the MotorWave mini windmills and have then set up in my back yard. I was looking for a way to monitor the voltage output and possibly track on a day to day basis. This I think will fit the bill quite nicely. Again thank you VERY much.
Beege (author)  tom123il2 years ago
Sounds very cool. If your interested in power production theres a nice little low priced hall effect current sensor here you can get for about $7. Works very well for an application such as this. Be sure to let me know if you run into any problems or confusion.
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tom123il Beege2 years ago
A bit ago I bought a couple of these RF Link Transmitter - 315MHz. They have a range of 500 ft. Do you think they may work as well?
Beege (author)  tom123il2 years ago
U mean instead of a wiimote?