Line Tracker Module (3 Channels) Thermoelectric Cooler the 74HC283 can be used

the 74HC283 can be used with either all active HIGH operands (positive logic) or all active LOW operands (negative logic)

you can get years of precision timekeeping

3 V Datasheet

Transmitting range (work at 5V): 40m indoor

This board breaks out all 20 pins of the XBee to a 0

Line Tracker Module (3 Channels) Thermoelectric Cooler the 74HC283 can be usedThis Line Tracker sensor consists of 3 IR transmitter and IR receiver pairs. This tracker sensor is typically used for robots in line following task. It can be used for either dark or bright line following. The tracker sensor have 3 digital outputs to user indicating the existence of the line. Every sensor is provided with its own LEDs as indication of line detection. Features Operating voltage 5V Output low black line, a white line output high