A far more useful case is to provide a power supply for the microcontroller programmer, which has no wall wart. Today’s microcontrollers consume less current than their predecessors, so you can easily ...

The Plan The plan is simple enough. A Linux program listens to a real serial port and watches for special character sequences in the data stream.

Anyway, I was assuming that I'd have to go out of the serial port and into a microcontroller of some kind to turn the bitstream into a raw voltage corresponding to percentage of processor usage.

So I'm trying to detect through Visual Basic 6.0 when a voltage change occurs on one of the pins of the serial/parallel port. The whole thing is pretty simple; no data transfer/handshaking/etc ...

Many industrial and instrumentationsystems need to measure theduration of pulse inputs, such as frequencyfrom rotational-speed sensors,gating and strobe pulses from externalsystems, and PWM ...