What is the correct way to wire a reflective object sensor
Dunner
Posts: 6
I am using a fairchild QRB1113 reflective object sensor. What is the proper way to wire it up
Comments
The LED reflects off of an object in to the transistor. The Transistor is turned ON and it conducts.
The datasheet says the LED can take 50mA. With a Vcc of 5volts, you'll need a resistor equal to 5/50mA=100ohms minimum...I'd go for 120ohm resistor.
Put the resistor between Vcc and the Anode. Then connect the Cathode to ground (hope I didn't get that backwards....).
On the other end, you tie pin 4 (the collector) to a 1kohm resistor to Vcc. Then tie pin 3 (the emitter) to ground.
connect your stamp to pin4 (between pin4 and the resistor) and whenever you have an object reflecting the light, you'll see a low on your stamp.
Hope I got that right....
cheers
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<FONT>Steve
What's the best thing to do in a lightning storm? "take a one iron out the bag and hold it straight up above your head, even God cant hit a one iron!"
Lee Travino after the second time being hit by lightning!