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The TK42 at an angle: a black board with a wide gold border, a black eight-legged chip near the top with LM75 printed beside it, a small capacitor to its left, two small resistors and a thermometer icon at the right, a larger thermometer icon between two round LEGO holes, lonely binary along the left edge, I2C in a box, and a right-angle four-pin header out of the front edge.
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This board opens in a VR headset: life-size, or big enough to stand beside, with every pin and every part named where it sits. Open this address in the browser on a headset such as Apple Vision Pro or Meta Quest.

learn.lonelybinary.com/vr/tk42
You have this

LM75 Temperature Sensor

An LM75B digital temperature sensor on a TinkerBlock board, read over I2C at address 0x48: two bytes that are already degrees, in steps of an eighth, within 2 °C from −25 to 100 °C. VCC goes to your board's logic supply because the pull-ups end at VCC.

Accuracy
±2°C, −25 to 100 °C
Step
0.125°C
Address
0x48fixed, one per bus
Supply
2.8 to 5.5V; use your logic voltage
Start here · 01 The four pinsOpen the board in 3D

Every pin and part: the LM75B with its address pins on GND and its OS pin on nothing, the two 10 kΩ pull-ups on SDA and SCL, and the I2C PULL UP jumper on the back.

Product questions & answers ↓

The whole handbook9 articles · 40 minQuick referencePDF · 424 KBModel (GLB)GLB · 861 KBCAD (STEP)ZIP · 831 KBDatasheetPDF · datasheet.lcsc.comDatasheetPDF · nxp.comPinout and specsThe pin table, and the questions people ask first
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LM75 Temperature Sensor

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk42.

Order or missing parts?

Email us or reply to your order, and quote tk42 — 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.