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Creating the Hardware:

As basis for the hardware, a USB interface board K8055(N) or VM110(N) from Velleman can be used.
This board has 5 digital inputs that can be used to connect the push buttons to control the Countdown (Next, Pause, Stop, Archer left, Archer right).
It has 8 digital outputs that can be used to switch the lamps for A, B, C, D, Red, Orange or Green and the Buzzer by the Countdown Software.

    velleman k8055

The address of the board should be set to address 0.
If the board is connected to the PC, the Countdown software will recognize the board during startup.
If the board get connected when the Countdown software is already running, click the connect icon on the right bottom side. When connected the software will indicate that board version V2 is connected.

To switch lamps on mains voltage (110-230Volt AC) it is possible to use relays. But a cheaper and more reliable solution is using Triacs. And use opto couplers to separate the Low voltage from PC and the high voltage from mains.
For details, click image


    electric circuit diagram



© 2014, Henk Jegers