A friend of mine needs to know when his furnace turns off and on. He has installed a relay that switches state when the furnace changes.
All he needs is a USB device with two wires hanging out to place across the relay contacts (and maybe a pull-up resistor). Maybe some software to log the changes. I thought finding something like this would be easy but I can't seem to turn up anything reasonable.
I found a $260 device with no software support.
A sparkfun device for $19.99 but again no software support and requiring both Arduino coding and PC coding.
If needed I could whip up some VBA code for the PC but I don't have the time to learn Arduino. In the distant past I did a lot of assembly language for the same chip family as the Arduino but I'm not ready to restart that stuff.
Any ideas?
All he needs is a USB device with two wires hanging out to place across the relay contacts (and maybe a pull-up resistor). Maybe some software to log the changes. I thought finding something like this would be easy but I can't seem to turn up anything reasonable.
I found a $260 device with no software support.
A sparkfun device for $19.99 but again no software support and requiring both Arduino coding and PC coding.
If needed I could whip up some VBA code for the PC but I don't have the time to learn Arduino. In the distant past I did a lot of assembly language for the same chip family as the Arduino but I'm not ready to restart that stuff.
Any ideas?