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I ended up building mine in an old 720 civil defence meter, based on the instructions from "The Tinkerers Apprecentice" below. Used an Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302 (https://www.adafruit.com/product/2130), and works perfectly ($3.95), and a barebones arduino.Has anyone ever mad any luck in getting the old Civil defence round meter to work via PWM or something else - this would be perfect. The meter is marked as 50 micro amps, but I don't know it's internal resistance
Yes, that looks like the problem Jeff - all I need to do is push a wire into the 9 pin, and it goes wild - seems extremely sensitive, and I'm not sure how to decrease the sensitivity with your style of code. I was trying to use DigitalRead, but not sure if I have the right piece of code.Thanks for replying - this is my only problem.
Hi allI've just made one of these with an Arduino UNO, and it works fine, except sometimes seems to spontaneously go into "detection" mode i.e. as if the button has been pressed, but it hasn't. I can't read this style of Arduino code - anyone have any suggestions?
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