Arduino projects often use PIR sensors for motion detection, but with dozens of modules available, choosing the right one can be confusing. This guide covers the most popular PIR sensor modules for Arduino, their characteristics, and when to use each.<\/p>\n
Price:<\/strong> $2-3 Best for:<\/strong> Beginners, breadboard projects, 5V Arduino (Uno, Mega, Nano).<\/p>\n Price:<\/strong> $2-3 Best for:<\/strong> Battery-powered projects, ESP32\/Raspberry Pi (3.3V), compact designs.<\/p>\n Price:<\/strong> $2-3 Best for:<\/strong> Projects where HC-SR501 is too large but 5V is available.<\/p>\n Price:<\/strong> $8-12 Best for:<\/strong> Battery-powered projects, professional products, long-term reliability.<\/p>\n Price:<\/strong> $6-8 Best for:<\/strong> Energy-harvesting projects, coin-cell battery devices.<\/p>\n \u7b49\u65b9\u97624.5-20V<\/th>\n \u7b49\u65b9\u976250-65\u00b5A<\/th>\n \u7b49\u65b9\u97623-7m<\/th>\n \u7b49\u65b9\u976232\u00d724mm<\/th>\n \u7b49\u65b9\u9762Beginners, 5V projects<\/th>\n \u7b49\u65b9\u97622.7-12V<\/th>\n \u7b49\u65b9\u976235\u00b5A<\/th>\n \u7b49\u65b9\u97623-5m<\/th>\n \u7b49\u65b9\u976210\u00d78mm<\/th>\n \u7b49\u65b9\u97623.3V, battery projects<\/th>\n \u7b49\u65b9\u97624.5-20V<\/th>\n \u7b49\u65b9\u976250\u00b5A<\/th>\n \u7b49\u65b9\u97623-7m<\/th>\n \u7b49\u65b9\u976212\u00d712mm<\/th>\n \u7b49\u65b9\u9762Compact 5V projects<\/th>\n \u7b49\u65b9\u97622.3-4.0V<\/th>\n \u7b49\u65b9\u97621-6\u00b5A<\/th>\n \u7b49\u65b9\u97625-12m<\/th>\n \u7b49\u65b9\u9762Various<\/th>\n \u7b49\u65b9\u9762Battery, professional<\/th>\n \u7b49\u65b9\u97621.4-3.6V<\/th>\n \u7b49\u65b9\u97622\u00b5A<\/th>\n \u7b49\u65b9\u97625-10m<\/th>\n \u7b49\u65b9\u9762TO-5<\/th>\n \u7b49\u65b9\u9762Energy harvesting<\/th>\n<\/tbody>\n \u8868<\/p>\n For battery-powered projects, power consumption is critical. Consider these options:<\/p>\n To maximize battery life, use Arduino deep sleep with wake-on-interrupt from PIR output:<\/p>\n If using a 3.3V board:<\/p>\n All modules work with 5V Arduino. HC-SR501 is the simplest choice.<\/p>\n For most Arduino beginners, the HC-SR501 is the best starting point due to its low cost and adjustable settings. For battery-powered projects, the AM312 offers a good balance of size and power consumption. For professional or long-term projects, consider the Panasonic EKMB series for superior reliability and ultra-low power.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction Arduino projects often use PIR sensors for motion detection, but with dozens of modules available, choosing the right one can be confusing. This guide covers the most popular PIR sensor modules for Arduino, their characteristics, and when to use each. Popular PIR Sensor Modules for Arduino 1. HC-SR501 \u2013 The Classic Price: $2-3 Voltage: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4003","post","type-post","status-publish","format-standard","hentry","category-news"],"blocksy_meta":[],"yoast_head":"\r\n
\nVoltage:<\/strong> 4.5-20V (typically 5V)
\nOutput:<\/strong> 3.3V digital HIGH on detection
\nAdjustments:<\/strong> Sensitivity (range), time delay (hold time), trigger mode jumper
\nPros:<\/strong> Cheap, widely available, adjustable, works with 5V Arduino
\nCons:<\/strong> Relatively high power consumption (50-65\u00b5A standby), not 3.3V compatible without level shifting<\/p>\n2. AM312 \u2013 Mini Low-Power Option<\/h3>\n
\nVoltage:<\/strong> 2.7-12V
\nOutput:<\/strong> 3.0V digital HIGH
\nAdjustments:<\/strong> None (fixed 2-second hold time)
\nPros:<\/strong> Very small (10\u00d78mm), low power (35\u00b5A standby), works with 3.3V systems
\nCons:<\/strong> Fixed hold time, shorter range (3-5m), more expensive than HC-SR501<\/p>\n3. HC-SR505 \u2013 Mini HC-SR501<\/h3>\n
\nVoltage:<\/strong> 4.5-20V
\nOutput:<\/strong> 3.3V digital HIGH
\nAdjustments:<\/strong> None (fixed 3-5 second hold time)
\nPros:<\/strong> Smaller than HC-SR501, good range (3-7m)
\nCons:<\/strong> Fixed hold time, requires 5V, higher power than AM312<\/p>\n4. Panasonic EKMB Series \u2013 Premium Low Power<\/h3>\n
\nVoltage:<\/strong> 2.3-4.0V
\nOutput:<\/strong> Open-drain (requires pull-up)
\nAdjustments:<\/strong> Digital interface (I2C) on some models
\nPros:<\/strong> Ultra-low power (1-6\u00b5A), high sensitivity, excellent temperature stability, various lens options
\nCons:<\/strong> More expensive, requires pull-up resistor, surface-mount or small package<\/p>\n5. Excelitas PYD 2597 \u2013 Ultra-Low Power Digital<\/h3>\n
\nVoltage:<\/strong> 1.4-3.6V
\nOutput:<\/strong> 1-wire digital interface
\nAdjustments:<\/strong> Configurable via 1-wire
\nPros:<\/strong> Extremely low power (2\u00b5A), 1.4V operation, integrated wake-up mode
\nCons:<\/strong> Requires external lens, more complex interface, surface-mount<\/p>\nComparison Table<\/h2>\n
\n\n
Model<\/th>\n Voltage<\/th>\n Standby Current<\/th>\n Range<\/th>\n Size<\/th>\n Best For<\/th>\n<\/thead>\n \nHC-SR501<\/th>\n AM312<\/th>\n HC-SR505<\/th>\n Panasonic EKMB<\/th>\n Excelitas PYD<\/th>\n Power Considerations<\/h2>\n
Battery-Powered Projects<\/h3>\n
\n
Adding Deep Sleep to Arduino<\/h3>\n
#include <avr\/sleep.h>\n\nvoid setup() {\n pinMode(pirPin, INPUT);\n attachInterrupt(digitalPinToInterrupt(pirPin), wakeUp, RISING);\n}\n\nvoid loop() {\n \/\/ Do nothing - all work done in interrupt\n}\n\nvoid wakeUp() {\n \/\/ PIR triggered - process motion\n}\n<\/code><\/pre>\nVoltage Compatibility<\/h2>\n
3.3V Microcontrollers (ESP32, Raspberry Pi Pico, STM32)<\/h3>\n
\n
5V Microcontrollers (Arduino Uno, Mega, Nano)<\/h3>\n
Detection Range Selection<\/h2>\n
\n
Where to Buy<\/h2>\n
\n
Sample Arduino Code for Each Sensor<\/h2>\n
HC-SR501 \/ HC-SR505 \/ AM312<\/h3>\n
const int pirPin = 2;\n\nvoid setup() {\n pinMode(pirPin, INPUT);\n Serial.begin(9600);\n}\n\nvoid loop() {\n if (digitalRead(pirPin) == HIGH) {\n Serial.println(\"Motion detected!\");\n }\n delay(100);\n}\n<\/code><\/pre>\nPanasonic EKMB (with pull-up)<\/h3>\n
const int pirPin = 2;\n\nvoid setup() {\n pinMode(pirPin, INPUT_PULLUP); \/\/ Enable internal pull-up\n Serial.begin(9600);\n}\n\nvoid loop() {\n if (digitalRead(pirPin) == LOW) { \/\/ Note: inverted logic\n Serial.println(\"Motion detected!\");\n }\n delay(100);\n}\n<\/code><\/pre>\nConclusion<\/h2>\n