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Measuring RPM via Photo reflector
Computer
Interface
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Make a ground loop. Solder together pin 3 on both 1381's
and the Emitters on both 3904's. All four pins need to be connected
together. Now make a positive loop. Since the potentiometer wiper is connected to positive, now would be a good time to glue it to the photovore block. Solder the potentiometer wiper to the Emitters on the 3906's and leave a short length of lead hanging out the back. You'll need to solder other components to it later. It's time to give out little creature some eyes. These photodiodes were given to me for free. They work very well for BEAM applications. Your photodiodes may look very different. Make sure to figure out the photodiodes polarity. They won't work if installed backwards. Anode goes to the potentiometer leads and cathode goes to pin 2 on the 1381's. |
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