Qwiic Chirp 101 Ultrasonic Rangefinder

The Qwiic Chirp 101 is an ultrasonic time-of-flight (ToF) rangefinder based on the TDK InvenSense CH101 sensor. It measures distances from 4 cm to 1.2 m with millimetre accuracy and can detect multiple objects within its field of view simultaneously, thanks to an integrated system-on-chip that processes the ultrasonic echo data and provides digital range readings via I²C.

This Qwiic breakout provides voltage regulation and level shifting for the MOD-CH101 evaluation module, which consists of the CH101 sensor in an omnidirectional acoustic housing assembly connected via a short flex cable for easy mounting.

Key Features

• 4 cm to 1.2 m Range – Millimetre-accurate ultrasonic time-of-flight measurements
• Multi-Object Detection – Simultaneously ranges multiple targets within its field of view
• Works in Any Lighting – Ultrasonic operation is unaffected by sunlight, target colour, or optical transparency
• I²C Interface – Digital range output via Qwiic/STEMMA QT connector
• 175 kHz Operating Frequency – PMUT (piezoelectric micro-machined ultrasonic transducer) and SoC in a compact 3.5 × 3.5 mm package
• Ultra-Low Power – Designed for battery-powered and IoT applications
• Operating Temperature – -40°C to 85°C

Resources

• TDK InvenSense CH101 Product Page – Specifications, API, and documentation
• CH101 Datasheet (PDF)
• Hardware Design Files (GitHub)