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http://www.serasidis.gr/circuits/AVR...cilloscope.htm các bác làm thử cái này chơi 
Frequency measurement up to 5 kHz (square wave)
Voltage input 24V AC / 30V DC
Power supply 12V DC
Liquid Display Crystal 128x64 pixels
Measurement display area 100x64 pixels
Auto trigger
Frequency measurement up to 5 kHz (square wave)
Voltage input 24V AC / 30V DC
Power supply 12V DC
Liquid Display Crystal 128x64 pixels
Measurement display area 100x64 pixels
Auto trigger
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