Copyright © 1990-2019 quirkfactory.com. All rights reserved.
[Next: Step 2 - Laying out the Board >>]
PartsTo begin with, you'll need to create seven sensor circuits. The total parts list includes
* The Sharp GP1S525 now seems to be sold out, but the GP1S525VJ00F seems to be a suitable replacement and is available from digikey.
- (7) Sharp GP1S525 CAT # OSU-55 from All Electronics
- (7) 10k Ohm resistor (1/4 Watt)
- (7) 470 Ohm resistor (1/4 Watt)
- (7) small pieces of perf board
- wire (red, black, and green)
Sensor CircuitThis picture shows the detail of the sensor circuits. Note the alignment of the emitter and sensor parts of the Sharp GP1S525 which are are labeled on its case.
AssemblyIf constructing the sensors by hand on proto board, the final assembly looks like this. The red and black leads are for +V and GND, respectively. Green carries the data out.
Note that the emitter side of the sensor must be aligned close (less than 1/8") to the edge of the circuit board. In a later step, we will glue a strip of plastic to the side of the sensor. The plastic must extend below the edge of the perf board.
RepeatThat's it - make seven of these, and test each to make sure that the high/low output state changes when the sensor is blocked.