The TK09 at an angle: a black board with a gold-plated border, a teal-green two-way screw terminal near the top beside a multimeter icon, two tiny resistors, 5X SCALING printed large, VOLTMETER and ANALOG along the edges, two big mounting holes, and a right-angle four-pin header labelled GND, NC, NC and SIG.

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Voltmeter

A 30 kΩ and 7.5 kΩ divider behind a two-screw terminal: SIG is exactly one fifth of the input, so an analog pin can read up to 25 V on a 5 V board and about 15.5 V on a 3.3 V one. DC only, measured from GND.

Scaling: 5to 1
Up to: 25V on a 5 V board
Load: 37.5kΩ across the input
Wires: 2GND and SIG

Start here · 01 The four pins Open the board in 3D

Turn it over and see the two holes to wire, GND and SIG, and which screw is which: GND at the header's GND end, the input at the SIG end. There is no VCC.

Product questions & answers ↓

The whole handbook12 articles · 55 min Quick referencePDF · 496 KB Voltmeter model (GLB)GLB · 806 KB Voltmeter CAD (STEP)ZIP · 660 KB Voltmeter drawing (PDF)PDF · 2.2 MB Voltmeter drawing (DXF)ZIP · 28 KB Terminal drawingPDF · datasheet.lcsc.com Pinout and specsThe pin table, and the questions people ask first

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Voltmeter

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Not on general sale yet. Reply to your order and we will sort out a spare — quote tk09.

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Email us or reply to your order, and quote tk09 — 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.