SparkFun Human Presence Sensor Breakout - AK9753 (Qwiic)

The SparkFun AK9753 Human Presence Sensor Breakout is a unique sensor that is far from your typical Passive Infrared (PIR) sensor. This Qwiic-enabled, 4-channel Nondispersive Infrared (NDIR) sensor is designed to detect human presence and even discern the direction of movement. Each channel has a distinct field of view, making it possible to not just detect a human but also determine their moving direction. Communication with this breakout is made simple and efficient via I²C, facilitated by the Qwiic system. However, for those who prefer using a breadboard, 2.54mm spaced pins are also available.

The AK9753 sensor onboard is a digital sensor that provides a 16-bit digital value over I²C. Each of the four sensors outputs the IR current in pico-amps. The PIR reading ranges from roughly -200 (no human present) to 1500 when a human is detected standing in front of a given channel. However, these readings may vary due to environmental factors and other heat sources in view. To simplify the use of this breakout, a full library has been written to control the sensor, complete with examples to guide you on how to output the sensor readings.

It's important to note that the I²C address of the AK9753 is 0x64 and can be selected to 0x65 or 0x67 using a jumper. To communicate with multiple AK9753 sensors on a single bus, a multiplexer/Mux is required. 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 designed to make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector, saving required PCB space. The polarized connections also ensure that you can’t hook it up incorrectly.

The SparkFun AK9753 Human Presence Sensor Breakout comes with several features, including Qwiic-Connector Enabled, Quad infrared sensor module, 16-bit reading on all four channels, Digital I²C Interface, Voltage: 1.7V to 3.3V, and Extremely low current: 100µA.

Supporting documents such as the Schematic, Eagle Files, Qwiic Info Page, Hookup Guide, Datasheet (AK9753), Arduino Library, and GitHub are also provided to assist you in using the SparkFun AK9753 Human Presence Sensor Breakout.