The TK50 ultrasonic sensor seen from above at an angle, back side up: a black board with a gold-plated border, two cream-coloured cylindrical transducers standing off the far side, a sixteen-pin chip, a four-pin header, and silkscreen reading TK50 ULTRASONIC DISTANCE SENSOR, lonely binary, 3.3V-5V and a MODE J1 J2 table.

You have thistk50

Ultrasonic Distance Sensor

Distance by echo timing, on a chip that speaks four protocols and runs from 3.3 V. Soft and angled surfaces are where it quietly lies to you.

Supply: 3.3–5V, no divider needed
Range: 2cm to about 3 m
Accuracy: ±1cm under a metre
Interfaces: GPIO, I2C, UART, 1-Wiretwo solder bridges pick one

Start here · 01 What the echo measures The reference

Product questions & answers ↓

The whole handbook11 articles · 55 min Pinout and specsThe pin table, and the questions people ask first

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Ultrasonic Distance Sensor

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Need another

Comes in this kit — not sold separately

TinkerBlock Ultrasonic Distance Sensor Kit

Order or missing parts?

Email us or reply to your order, and quote tk50 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.