Posts tagged passive
Arduino Interrupts with PIR Motion Sensor
Arduino Interrupts with PIR Motion Sensor

The basics of Arduino’s hardware interrupt is explored through the use of a passive infrared (PIR) sensor. The passive infrared sensors used here operate at voltages from 2.7V - 5V and use very little energy when operating in the non-tripped state. The PIR sensor is ultimately tripped by an infrared source, typically human body heat (or another animal with similar radiative emission). When the PIR sensor is tripped it sends a HIGH signal to its OUT pin, which will be read by the Arduino’s interrupt pin (pin 2 or 3 on the Uno board). This process seems trivial, but when done correctly can save massive amounts of energy when dealing with battery-powered systems, as in home automation.

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Arduino, ElectronicsJoshua HriskoPIR, passive, passive infrared, PIR sensor, Sensor, IR Sensor, Infrared, LED, Arduino, Arduino IoT, Arduino LED, Arduino PIR, Arduino Sensor, Arduino Interrupt, Interrupt, Arduino IDE, Resistor, Arduino Uno, Arduino Low Power, Low Power, Arduino LowPower, Arduino Wiring, VCC, ATmega, ATmega328, ATmega328P, Power Consumption, Arduino Power Consumption, Arduino Power, RISING, FALLING, CHANGE, attachInterrupt, Arduino attachInterrupt Comment