We have a request from a client that we need to control serial port pins when certain events occur in our software. Our client is a seasoned electrical engineer and does not want or need UART or any ...

(Reposted from Other Hardware)<BR><BR>I'm trying to rig something up with a circuit and a serial port, and I'm curious: is there any way I can send pulses on individual pins with a PC, or do I just ...

This hack is a bit older, but one aspect of the setup makes it worth sharing. Shift registers are a common component to include in a project when you need to increase the number of I/O pins available.