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The TK119 at an angle: a small black board with a gold border, a black two-screw terminal marked LOAD on the left and a red one on the right at the back edge, a large black rectangular shunt resistor between them under two arrows pointing from the red terminal toward the black, two round LEGO holes, the eight-legged INA219, lonely binary up the left edge, and four right-angle pins out of the front edge.
VR

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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/tk119
You have this

TK119 INA219 Current and Voltage Monitor

A 100 milliohm resistor in the positive wire and a chip that reads the millivolts across it. Current, voltage and power over I²C, up to 3.2 A on a rail of up to 26 V.

Full scale
3.2A, widest setting
Rail
0 to 26V
Supply
3 to 5.5V
Address
0x40one of four
Start here · 01 Current through a resistorOpen the board in 3D

Every pin and part: the 100 mΩ shunt between POWER + and LOAD +, the INA219 that reads it, the two 10 kΩ pull-ups on SCL and SDA, and the A1 and A0 pads on the back.

Product questions & answers ↓

The whole handbook11 articles · 60 minQuick referencePDF · 355 KBModel (GLB)GLB · 2.1 MBCAD (STEP)ZIP · 1.6 MBDatasheetPDF · ti.comPinout and specsThe pin table, and the questions people ask first
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TK119 INA219 Current and Voltage Monitor

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Not on general sale yet. Reply to your order and we will sort out a spare — quote tk119.

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Email us or reply to your order, and quote tk119 — 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.