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Len Bayles has designed a great looking Meter Clock which is based on the Atmel AT89C2051 microcontroller. The design is similar to the Multimeter Clock that I created. Len provides the code and schematic on his site so you can make your own. “The software in the microcontroller handles the count for the time. It “talks” to a 4 channel Digital to Analog converter to derive the voltage to position the needles on the three meters. The outputs of the D2A converters are buffered with a quad amp. Otherwise the current draw of the 1ma meters would exceed the D2A converter.”
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July 9th, 2010
Great project.
I have recently aquired 3x 200uA FSD meters (and I only paid GP£1 each for them!). I would imagine that the circuit would be farly easy to adapt, just by changing the value of the DAC output resistors.
Why didn’t I buy more meters?
July 9th, 2010
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July 29th, 2010
HMMM!!!!!!!!! Sound like good. i wanna try it myself!!!