Project: Metal Object Counter

This is actually a somewhat old project of mine. I did it in the 12th std. as my final exam project.

I basically wanted to do something different. Most friends were just buying readymade kits and just soldering them together. Well I was no different, even I did the same! I got a Metal Detector kit for Rs. 80 ($2).

All was fine. I was feeling I had a unique project but as the submission date neared, I came to know that there were atleast 5 other people using the same kit. All the time I had been looking for something better to make and as I had been unable to think of something I had to buy this kit.

Finally I thought harder. Then in that week we had a practical where we were taught the use of a decade counter, a circuit that would count upto 9 with clock pulses at the input. It used an IC7490 as a counter and an IC 7447 as a driver for the 7-segment display we were using…

Now I thought that my metal detector gives high-low signals each time so I can get a counter to count them. Further getting two of these counters in series I can get it to count upto 99! So then thats what you have here in this video, its counting coins. Cool?

Video credits: Avinash Bangera — A friend of mine from 11th std.

Originally published at paramaggarwal.com.

Written by

Software guy. When you try to tell computers what to do, you eventually learn about human nature as well. (http://paramaggarwal.com)

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