Aj Sr04m Datasheet //top\\ May 2026

Some versions have a 5th pin (EN – Enable), but standard 4-pin is most common. If present, tie EN to VCC to enable. Wiring Example (Arduino): AJ-SR04M → Arduino Uno VCC → 5V Trig → Digital Pin 9 Echo → Digital Pin 10 GND → GND 3. Theory of Operation & Timing Diagram The AJ-SR04M uses the same timing protocol as HC-SR04, but with improved signal conditioning for longer cable runs.

| Pin | Name | Function | |-----|------|-----------| | 1 | VCC | +5V DC (regulated) | | 2 | Trig | Trigger input (active high, 10 µs min pulse) | | 3 | Echo | Echo output (PWM width = time of flight) | | 4 | GND | Ground | aj sr04m datasheet

def get_distance(): GPIO.output(TRIG, False) time.sleep(0.05) GPIO.output(TRIG, True) time.sleep(0.00001) GPIO.output(TRIG, False) Some versions have a 5th pin (EN –

while GPIO.input(ECHO) == 0: pulse_start = time.time() while GPIO.input(ECHO) == 1: pulse_end = time.time() Theory of Operation & Timing Diagram The AJ-SR04M

AJ-SR04M is the best all-rounder for outdoor/wet applications needing short-range detection (2 cm blind zone). JSN-SR04T has longer range but larger blind zone (20 cm). HC-SR04 is indoor only. 10. Application Circuit & Code Examples 10.1 Arduino (Standard) #define TRIG 9 #define ECHO 10 void setup() Serial.begin(9600); pinMode(TRIG, OUTPUT); pinMode(ECHO, INPUT);

delay(60);