Recent content by dforde

This project is not for a building or anything like that, so there are no regulations involved, I have a number of alarm devices that when they alarm, there is a 3.5mm mono jack, tip is signal output, ring is 0V. Signal is open collector type: high impedance when not alarm, low. I want to be...

Thanks for the reply, do you know of an available circuit design for this, and the pin assignments for the port, also what kind of software could I use for the monitoring of the alarms, any and all help is greatly appreciated, the commercial solution to this is very $$$$$$.

I am trying to come up with a way to monitor a device that alarms. The signal is open collector: high impedance when not alarm. I would also like to be able to connect this to a computer and monitor and log the alarms when they happen. Any help would be greatly appreciated.