Reference design: 1-wire-bus connectivity of people-sensing over 100m

January 29, 2017 // By Graham Prophet
Maxim Integrated has posted details of a reference design (with fully-built hardware available) that enables presence sensing, people counting, and gesture detection while tethered up to 100m along a 1-Wire bus.

MAXREFDES131# is a sensing solution featuring the Panasonic AMG8833 Grid-EYE and the Maxim 1-Wire bus, enabled by the DS28E17. Panasonic's Grid-EYE is an 8x8 (64) pixel infrared array sensor with digital output (I ²C) for thermal presence, direction, and temperature values. Its built-in lens includes a 60 degree viewing angle. Grid-EYE features compact SMD design using MEMS thermopile technology. Panasonic's product page for the device is here.

Applications for this sensor can include: digital signage, security, lighting control, kiosk / ATM, medical imaging, automatic doors, thermal mapping, people counting, robotics, and others. Maxim's reference design board features RJ-11 connectors and convenient mounting holes for quick evaluation and implementation.


Example source code for interfacing with MAXREFDES131# is available for both Arm mbed and Arduino platforms. This design works with MAXREFDES132#, a hardware 1-Wire shield. A demonstration GUI allows for visual feedback of up to 10 daisy-chained MAXREFDES131# 1-Wire Grid-EYE sensors.

Bill-of-materials, schematics, layout files, and fabrication files are all available from the Design Resources tab. In addition, boards are available for purchase.


The design features; 1-Wire network connectivity; flexible location/deployment; sleep mode; availability of example source code; and a demonstration GUI


Maxim Integrated;