I use both types of output printer and pci
input is a DATAQ 4 channel and a 16 channel
Output from co2 are Millivolts per PPm
Output from ph and ppm same
Output from a voltage divider and wall powersupply plugin DC
Lamp check from a car solar cell
Relay radio shack 12 volt 15 amp
Solid stare relays used from Ebay 3-12 volt
Its all basic electric stuff , real basic
The printer port works great remember to change the computer battery out every year Xmas to new years is when I do it so I do not forget.
oldsanclem Reviewed by oldsanclem on . Automation Does anybody still use old fashion timers, with old computer around. Why would anybody us a a timer , when you can set up to 8 channels with a printer port relay $36 to $120 and a controler program likd relayrunner.With over 15 plus years of using a computer with one failure,(dam compute battery went bad the same day as the power went out) It has a restart thats part of the program. Do a search for relayrunner, it has a free test , so you can start it up , under emulation mode , make all your Rating: 5