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This instructable will show how to add an external trigger to a stop watch so that it can be used for event timing from circuits. It's designed to ...
Take the watch apart.
Add wires to the start/stop switch. Check the polarity of these wires and mark them with a sharpie to keep track.
Solder the following circuit. Here's how it works: When there are 0V across RED-BLK, the transistor is non-conducting. When there are > 0.6V across RED-BLK, the transistor conducts. ...
In this step, add some screw prongs by drilling holes slightly smaller than the machine screws you will be using. After, reassemble the watch.
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