Arduino Controls an Infrared Helicopter

Posted on Feb 6, 2014

2N3904 is the NPN transistor. Looking at the flat face, the left lead is Emitter (pin 1 in schematic), the middle lead is Base (pin 2 in schematic), the right lead is Collector (pin 3 in schematic). Another end of 50 Ohm resistor to +5v pin on Arduino. (An alternative would be use a bigger resistor, say 100 Ohm, to replace the 50 Ohm one, and conn

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ect the other end to Vin Pin on Arduino. ) This resistor is to make sure we won`t burn the IR LED. The IR LED can only accept a maximum of 100 mA current, so if we use 5V to drive the IR LED, we need to make sure the current running through the LED is limited to less than 100 mA, which yields the resistance R=5V/100mA=50 Ohm. The nearest commonly-found resistor is 47 Ohm.

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