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Atmega128 multipurpose meter

Atmega128 is quite powerful microcontroller giving enough I/Os, memory and interfaces. Don Carveth some time ago constructed a megameter – a multipurpose device based on this microcontroller. Together with PC interface megameter has a nice bunch of features including: Two 0 – 10 VDC voltmeters; One 0 – 30 VDC Hi-Z autoranging voltmeter with x10 jumper to give 0 -300 VDC range; 0 – 3 Amps high side ammeter; 4 channel logic analyzer; Frequency generator – 50% duty cycle square wave, 0 – 5 VDC, uC clock with divider, 1 Hz to about 8 MHz; Waveform generator – sine, triangle, square wave, 1Hz to 20+ MHz; Frequency counter; +5 VDC supply – 200 mA available; -5 VDC supply – 300 mA available Board communicates via RS232 interface. If you will decide to replicate it – it should be easy to upgrade to USB with simple USB-TTL converter. [via] Continue reading