Descripción de Home made digital oscilloscope using a Microchip and a PC:
Made with 16f887, 4mhz crystal; the pic communicates with my app via rs-232. the reading of adc is triggered by an interrupt. The reading frequency is limited by the crystal and by the interrupt. It creates a buffer of data , that is sent to the MAX232 and so on to the PC. The app is made in visual c++ express 2008, the reading is done in another thread (so it's a multithreaded app, cuz i don't want to miss any reading due to the 'cycle-time' of the app (main loop)). It creates the impression that the graphic is done in real time, but actualy it's not. It repressents only a small fraction from the signal. The battery is only for bias-ing. The signal is generated by another app, and as you know, it's voltage rises from - to + so i had to make a bias (using a discharged Li-ion battery that i had near by, so it rises the voltage with ~2v), cuz i don't want to make my pic read negative voltages :P, even though it costs 3$.
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