資料來源：https://www.sparkfun.com/products/14349

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!

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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.

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Get Started with the Human Presence Sensor Breakout Guide

Features:

• Qwiic-Connector Enabled
• Quad infrared sensor module
• 16-bit reading on all four channels
• Digital I²C Interface
• Voltage: 1.7V to 3.3V
• Extremely low current: 100µA

Documents:

• Schematic
• Eagle Files
• Qwiic Info Page
• Hookup Guide
• Datasheet (AK9753)
• Arduino Library
• GitHub

Videos