SparkFun Ultrasonic Distance Sensor - TCT40 (Qwiic)

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The TCT40 Qwiic sensor measures distance with sound and sends readings over I2C. Its Qwiic connections simplify wiring to a compatible host, while separate trigger and echo pins provide another integration route. This makes it a useful component for comparing ultrasonic sensing with optical time-of-flight sensing in a robotics lesson. SparkFun lists a 2–400 cm measurement range and notes that the sensor arrives uncalibrated. Plan to calibrate and test it with the surfaces and placement used in the actual project before relying on its readings.

Specifications

Measurement method	Ultrasonic; TCT40 transducers
Supplier range	2–400 cm
Operating voltage	3.3 V
Interface	I2C through Qwiic; exposed trigger/echo pins
Default I2C address	0x2F
Calibration	Ships uncalibrated

Supplier price checked October 23, 2026: US$11.50; listed in stock at SparkFun. Price and availability may change. SparkFun confirms taxes, shipping, delivery and returns at its checkout.

Before you buy

Allow for calibration and application testing. Supply a compatible controller, cable and power source for the project.

Check current price, availability, taxes, shipping and returns at SparkFun before ordering.

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Official product specifications and documentation

Product photograph: SparkFun Electronics, used with permission.