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The TK70 at an angle: a black board with a gold border, lonely binary up the left edge, an N circle and an S circle with a triangle beside each near the top, a small black three-legged Hall chip under them, two small brown capacitors below it, two round LEGO holes, LINEAR HALL EFFECT SENSOR up the right edge, ANALOG in a box, and a right-angle four-pin header.
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learn.lonelybinary.com/vr/tk70
You have this

Linear Hall Effect Sensor

An SS49E-type linear Hall sensor on a TinkerBlock board: an analog voltage that rests at half of VCC with no field and moves about 3.25 mV per gauss at 5 V, up for one pole and down for the other. It tells you how strong a magnetic field is and which way it points. VCC must be your board's logic voltage, and it is not a current sensor on its own.

Sensitivity
3.25mV per gauss at 5 V
Linear to
±460gauss, either pole
No field
Halfof VCC, up or down from there
VCC
3V3 or 5Vyour board's logic voltage
Start here · 01 The four pinsOpen the board in 3D

Turn it over and see the three holes to wire: GND, VCC and SIGNAL. SIGNAL is the Hall chip's output, a voltage that rests at half of VCC and moves up or down with the field; the only other parts are two 100 nF capacitors.

Product questions & answers ↓

The whole handbook9 articles · 40 minQuick referencePDF · 436 KBLinear Hall Sensor model (GLB)GLB · 907 KBLinear Hall Sensor CAD (STEP)ZIP · 641 KBSLSS49E datasheetPDF · datasheet.lcsc.comPinout and specsThe pin table, and the questions people ask first
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Linear Hall Effect Sensor

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk70.

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Email us or reply to your order, and quote tk70 — 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.