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The TK17 at an angle: a black board with a gold-plated border, a black and white lever microswitch lying flat along the far edge with a flat metal lever reaching past it, two small resistors and a tiny LED in the middle, two big mounting holes, lonely binary along the left edge, a boxed DIGITAL along the right, and a right-angle four-pin header along the near edge labelled GND, VCC, NC and SIGNAL.3D
You have thistk17

Collision Sensor

A lever microswitch with its 10 kΩ pull-down and a red hit light already fitted: SIGNAL reads HIGH while the lever is pushed in. The bumper for a TinkerBlock robot, and the sense that never reports a wall that is not there.

Lever
1.4mm of travel to click, about
Pull-down
10kΩ fitted, a hit reads HIGH
VCC
3.3or 5 V, to match your board
Wires
3GND, VCC, SIGNAL
Start here · 01 Why a bumperOpen the board in 3D

Turn it over and see the three holes to wire: GND, VCC and SIGNAL. VCC sets the voltage SIGNAL reads on a hit, so match it to your board. NC is connected to nothing.

Product questions & answers ↓

The whole handbook10 articles · 45 minQuick referencePDF · 482 KBCollision Sensor model (GLB)GLB · 959 KBCollision Sensor CAD (STEP)ZIP · 711 KBCollision Sensor drawing (PDF)PDF · 2.0 MBCollision Sensor drawing (DXF)ZIP · 37 KBSwitch drawingPDF · datasheet.lcsc.comPinout and specsThe pin table, and the questions people ask first
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Collision Sensor

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk17.

Order or missing parts?

Email us or reply to your order, and quote tk17 — 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.