SparkFun Human Presence Sensor Breakout - AK9753 (Qwiic)

Product Overview

This is not your normal Passive Infrared (PIR) sensor! The SparkFun AK9753 Human Presence Sensor Breakout is a Qwiic-enabled, 4-channel Nondispersive Infrared (NDIR) sensor. Each channel has a different field of view, so not only can the AK9753 detect a human, but it can also tell which direction the person is moving. To make it even easier to use this breakout, all communication is enacted exclusively via I²C, utilizing our handy Qwiic system. However, we still have broken out 0.1" spaced pins in case you prefer to use a breadboard.

The onboard AK9753 is a digital sensor giving you a 16-bit digital value over I²C. Each of the four sensors outputs the IR current in pico-amps. A PIR reading can vary from roughly -200 (no human present) to 1500 when a human is detected standing in front of a given channel, but it varies due to environmental factors and other heat sources in view. We’ve written a full library to control the sensor and included examples showing how to output the sensor readings you need, making this breakout even easier to handle!

Note: The I²C address of the AK9753 is 0x64 and is jumper selectable to 0x65 or 0x67. A multiplexer/Mux is required to communicate to multiple AK9753 sensors on a single bus. If you need to use more than one AK9753 sensor consider using the Qwiic Mux Breakout.

The SparkFun Qwiic connect system is an ecosystem of I²C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.