With dozens of PIR modules available, choosing the right one for your Arduino project can be confusing. This guide covers the most popular options and when to use each.<\/p>\n
Price:<\/strong> $2-3 Price:<\/strong> $2-3 Price:<\/strong> $8-12 4.5-20V<\/th>\n 50-65\u00b5A<\/th>\n 3-7m<\/th>\n 32\u00d724mm<\/th>\n 2.7-12V<\/th>\n 35\u00b5A<\/th>\n 3-5m<\/th>\n 10\u00d78mm<\/th>\n 2.3-4V<\/th>\n 1-6\u00b5A<\/th>\n 5-12m<\/th>\n Various<\/th>\n<\/tbody>\n \u8868<\/p>\n For most 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, the Panasonic EKMB series provides superior reliability and ultra-low power.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction With dozens of PIR modules available, choosing the right one for your Arduino project can be confusing. This guide covers the most popular options and when to use each. Popular PIR Modules HC-SR501 – The Classic Price: $2-3 Voltage: 4.5-20V (5V recommended) Output: 3.3V digital HIGH Standby current: 50-65\u00b5A Pros: Cheap, adjustable sensitivity and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-4020","post","type-post","status-publish","format-standard","hentry","category-buying-guides"],"blocksy_meta":[],"yoast_head":"\r\n
\nVoltage:<\/strong> 4.5-20V (5V recommended)
\nOutput:<\/strong> 3.3V digital HIGH
\nStandby current:<\/strong> 50-65\u00b5A
\nPros:<\/strong> Cheap, adjustable sensitivity and hold time, works with 5V Arduino
\nCons:<\/strong> Higher power, not 3.3V compatible without level shifting
\nBest for:<\/strong> Beginners, USB-powered projects, 5V boards<\/p>\nAM312 – Mini Low-Power<\/h3>\n
\nVoltage:<\/strong> 2.7-12V (works at 3.3V)
\nOutput:<\/strong> 3.0V digital HIGH
\nStandby current:<\/strong> 35\u00b5A
\nPros:<\/strong> Small (10\u00d78mm), low power, 3.3V compatible
\nCons:<\/strong> Fixed 2-second hold time, shorter range (3-5m)
\nBest for:<\/strong> Battery projects, ESP32\/Raspberry Pi, compact designs<\/p>\nPanasonic EKMB – Premium Low Power<\/h3>\n
\nVoltage:<\/strong> 2.3-4.0V
\nOutput:<\/strong> Open-drain (requires pull-up)
\nStandby current:<\/strong> 1-6\u00b5A
\nPros:<\/strong> Ultra-low power, high sensitivity, excellent temperature stability
\nCons:<\/strong> More expensive, requires pull-up resistor
\nBest for:<\/strong> Battery projects, professional products<\/p>\nComparison Table<\/h2>\n
\n\n
Model<\/th>\n Voltage<\/th>\n Standby Current<\/th>\n Range<\/th>\n Size<\/th>\n<\/thead>\n \nHC-SR501<\/th>\n AM312<\/th>\n Panasonic EKMB<\/th>\n Power Considerations<\/h2>\n
Battery-Powered Projects<\/h3>\n
\n
3.3V Microcontrollers (ESP32, Raspberry Pi Pico)<\/h3>\n
\n
Sample Code<\/h2>\n
HC-SR501 \/ AM312<\/h3>\n
const int pirPin = 2;\nvoid setup() {\n pinMode(pirPin, INPUT);\n Serial.begin(9600);\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;\nvoid setup() {\n pinMode(pirPin, INPUT_PULLUP);\n Serial.begin(9600);\n}\nvoid loop() {\n if (digitalRead(pirPin) == LOW) { \/\/ Inverted logic\n Serial.println(\"Motion detected!\");\n }\n delay(100);\n}\n<\/code><\/pre>\nConclusion<\/h2>\n