PIR Movement Sensor Board datasheet shows 3-pin AM312 instead of 4-pin board schematic

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

I found that the PIR Movement Sensor Board datasheet link on the product page points to the wrong datasheet. The product page shows a 4-pin PIR sensor, but the linked datasheet (https://soldered.com/productdata/2022/03/Soldered_AM312_datasheet.pdf) is for a 3-pin AM312 sensor. These don’t match.

Originally submitted via email support on 26 February 2025. Migrated to the forum for community visibility.

2

Soldered Support:

The board has 4 pins because of an additional 555 timer circuit. You can find the schematic in the hardware repository: PIR-Movement-sensor-board-hardware-design/OUTPUTS/V2.2.0/PIR Movement sensor board Schematics.pdf at main · SolderedElectronics/PIR-Movement-sensor-board-hardware-design · GitHub

The BOM in that same repository shows the PIR sensor is an AM312. The board expands it with a NE555DR circuit, which extends the output pulse of the PIR sensor and smooths the output.