Generating simple voltage signal with BeagleBoard

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1

Hi,

I will be running an application on the beagleboard which will have an
integer variable I would like to keep track of. I would like to
monitor this variable with a DAQ board measuring an analog signal
generated by the beagleboard. Is the a way to output a given voltage
using GPIO or other method? It looks like I could convey the
information with PWM from the C3/C4 expansion header, but it would be
simpler if there was a way to generate a voltage signal directly
proportional to the value of the variable.

Thanks,
David

2

GPIO signals are either 1.8V or 0 volts. PWM signals are just variale duty cyclles of 1.8V to 0 volts. You coul dadd an DAC on the expansion port via I2C or SPI.

Now, the audio output could also be used. You would need to fill the buffer with data and it may take a little work, but it could be done.

Gerald