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Step 10Wire the Rotational Sensor
Be sure to keep track of the emitter versus the photo-transistor. The emitter is typically darkly shaded while the photo-transistor is clear.
Cut four equal lengths of wire, roughly a foot and a half in length. Two of the wires should be black, while the other two should be two different colors other than black (like red and yellow).
Solder a black wire to the anode lead of the emitter. The anode is the shorter of the two leads, while the cathode is the longer. Using your second black wire, do the same for the photo-transistor. Solder the third wire (red in my picture) to the cathode of the emitter. Solder the fourth wire (yellow in my picture) to the cathode of the photo-transistor.
Once you have your wires soldered on, use heat shrink or electrical tape to shield and protect the exposed leads.
Cut your ground wires close to the body of the sensor, leaving a few inches of wire from either lead. Strip about an inch of insulation from each ground wire, and tie them together. Use a third piece of black wire, and tie it to the same junction. Solder the junction, and insulate.
You should be left with three wires, which you can wrap together for stability.
Cut four equal lengths of wire, roughly a foot and a half in length. Two of the wires should be black, while the other two should be two different colors other than black (like red and yellow).
Solder a black wire to the anode lead of the emitter. The anode is the shorter of the two leads, while the cathode is the longer. Using your second black wire, do the same for the photo-transistor. Solder the third wire (red in my picture) to the cathode of the emitter. Solder the fourth wire (yellow in my picture) to the cathode of the photo-transistor.
Once you have your wires soldered on, use heat shrink or electrical tape to shield and protect the exposed leads.
Cut your ground wires close to the body of the sensor, leaving a few inches of wire from either lead. Strip about an inch of insulation from each ground wire, and tie them together. Use a third piece of black wire, and tie it to the same junction. Solder the junction, and insulate.
You should be left with three wires, which you can wrap together for stability.
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Aug 9, 2009. 2:53 AMteknobudd
says:
The ANODE is the longer and the cathode is the shorter leg of just about any L.E.D. A phototransistor's shorter leg is the collector and the longer leg is the emitter. You can look at any LED from either top or bottom and you will notice its base has a flat side - that is the cathode side. In the case of a phototransistor, the flat side indicates the collector side. Your instructions should work, but the terminology is incorrect.
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