Digital TTL (High = 3.3V, Low = 0V), making it compatible with both 3.3V and 5V microcontrollers like Arduino, ESP32, and Raspberry Pi.
The is a reliable, low-cost PIR motion sensor perfect for hobbyist and light commercial projects. While you won’t find an official “HW-416-B datasheet” from a major semiconductor brand, the HC-SR501 documentation applies directly . Use the specs and tips above to integrate it into your next motion-sensing project.
The HW-416-B timing can be understood in two modes:
| Problem | Likely Fix | |--------------------------|-------------| | Always HIGH output | Adjust sensitivity down; check for heat source (sun, heater) facing sensor | | Never triggers | Increase sensitivity; wait 15-30 sec after power-up for stabilization | | Triggers randomly | Disable “H” repeatable trigger; add a small capacitor (100nF) across VCC/GND | | Short detection range | Clean Fresnel lens; rotate sensitivity pot clockwise | | Output stays HIGH too long | Reduce time delay potentiometer (counter-clockwise) | hw-416-b pir sensor datasheet
Do not point the sensor toward radiators, AC vents, open windows, or heating ducts. Rapid air-temperature fluctuations trick the sensor.
The HW-416-B is fantastic, but it has a "memory." The pyroelectric sensor needs time to "reset" and stabilize after it triggers.
Output remains high as long as motion is detected. Digital TTL (High = 3
The HW-416-B lived in many projects after that: a cupboard light that only came on when hands reached in, a hallway guardian that lit the way for sleepy feet, a garden alarm that stayed quiet until a fox crossed. Each time, the datasheet—a modest document of voltages, currents, and angles—was the seed from which a practical solution sprouted.
When a human walks past, they pass the first slot, causing a positive differential change. As they continue walking, they pass the second slot, causing a negative differential change.
A frequent complaint with the HW‑416‑B is that it triggers constantly after being mounted in a certain location. This is usually caused by: Use the specs and tips above to integrate
void loop() int motionState = digitalRead(pirPin);
The HW-416-B is an electronic module designed to detect human or animal movement by measuring changes in the infrared (heat) levels emitted by surrounding objects.
Note: Always verify the silk-screen markings on your specific HW-416-B board, as manufacturing variances can sometimes invert the VCC and GND positions. Onboard Adjustments
Digital output signal (Connect to an Arduino digital pin or a relay module). GND: Ground connection. Key Features & Usage Immunity to Interference: Unlike larger sensors, the
delay(100);
