did, by converting the TV into a crude oscilloscope. The trick is to take ... coils and using an Arduino nano in combination with a DAC to amplify the input signal in order to get the waveform ...

2 channels of fast 6-bit analog output with an Arduino Nano and 12 resistors Display 64x64 pixel bitmaps and vector animations on an oscilloscope A binary-weighted DAC is a simple method for ...

But since the ADC sample-rate is lower than the DAC output-rate, the sampling value can only indicate that the voltage is changing. You can see sine wave, triangle wave, saw tooth wave and square wave ...