Datasheet

Chapter 7 • Navigating with Infrared Headlights
220 • Robotics with the BOE Shield-Bot
IR Object Detection Circuit
The next figures show the IR object detection schematic and wiring diagram. One IR object
detector (IR LED and receiver pair) is mounted on each corner of the breadboard closest to
the very front of the BOE Shield-Bot.
 Disconnect the power and programming cables.
 Build the circuit in the schematic below, using the wiring diagram as a reference
for parts placement.
Note that the anode lead of each IR LED connects to a 2 kΩ resistor. The cathode lead plugs
into the same breadboard row as an IR detector’s center pin, and that row is connected to
GND with a jumper wire.
Watch your IR LED anodes and cathodes!
The anode lead is the longer lead on an IR LED by convention. The cathode lead is shorter and
mounted in the plastic case closer to its flat spot. These are the same conventions as the red LEDs
we have been using.