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In this instructable I'll show you how to make a very accurate laser sensor timer. The timer latches the time automatically, making it easier to recor...
The lasers are going to act as the transmitters and the light sensing sensors are the receivers. When the laser beam is broken, the receivers loose co...
Materials: digital stop-watch toggle switch x 2 lasers x 2 9v batteries & clips x 2 AA batteries x 4 AA battery holders x 2 push-button switch proto...
Open your stop watch and locate the buttons; once you find them find their contacts. Solder one wire to each contact. You will only need to solder the...
Take your laser and solder the toggle switch to the negative terminal. Solder the other connection of the switch to your battery holder's black wire, ...
Follow the schematic. After soldering everything in place, cut it out. First picture= first sensor Second picture= second sensor
I made mine! Did you make your's? If your having trouble laying out the circuit or trying to figure a way to put everything on a board to save the m...
All you have to do to use the sensors is to shine a laser on the each sensor's photocell and put the batteries in! Once you do so, the timer will star...
Here are some additional things that you can do after your done: -add power switches -make holders for the lasers (look above) -connect the reset but...
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