![]() Search for analogcomp" and you should see the following library in the results. To use this library, go to Tools>Manage Libraries in the Arduino IDE. This library allows us to use the built in voltage comparator to trigger an interrupt function in the code. The line #include "analog Comp.h" includes the analog comparator library. Let's look at some of the interesting lines in the code. The code then times how long it took for a certain number of fan blades to pass by. ![]() Code The code for our optical tachometer will count the fan blades as they pass between the LED and the photoresistor. Resistor values are important for the two voltage divider circuits so make sure the correct values are used. PHOTOS w 史 3700 IH 11 = fritzing The system wiring diagram. Use female jumper wires to mount the LED and photoresistor so you can position the LED and photoresistor near the fan blades.Īl MOTOR TOT SHO he w DI w L. ![]() ![]() You can use the 5V pin on the Arduino to supply power instead of the breadboard power supply if needed. O UNO Arduino fritzing System Fritzing diagram. ![]()
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