LBLonely Binary Learn
Shop
The TK03 at an angle: a black board with a gold-plated border, three tiny LEDs stacked red, yellow and green near the top beside a traffic-light outline, three small resistors in a row below them, two big mounting holes, and a right-angle six-pin header along the near edge labelled GND, NC, NC, RED, YELLOW and GREEN.3D
You have thistk03

Traffic Light

Red, yellow and green LEDs, each with its own 1 kΩ resistor and its own pin, sharing one GND: three digital outputs, and the first sketch that has to remember what it is doing.

Current
3.1mA red from 5 V, about
Resistors
1kΩ on each light
LEDs
0805red, yellow, green
Wires
4GND, RED, YELLOW, GREEN
Start here · 01 The six pinsOpen the board in 3D

Turn it over and see which hole drives which light: GND and one pin per colour. The two NC holes are connected to nothing.

Product questions & answers ↓

The whole handbook8 articles · 40 minQuick referencePDF · 483 KBTraffic Light model (GLB)GLB · 971 KBTraffic Light CAD (STEP)ZIP · 927 KBTraffic Light drawing (PDF)PDF · 2.3 MBTraffic Light drawing (DXF)ZIP · 34 KBRed LED datasheetPDF · datasheet.lcsc.comYellow LED datasheetPDF · datasheet.lcsc.comGreen LED datasheetPDF · datasheet.lcsc.comPinout and specsThe pin table, and the questions people ask first
Community

Product questions

See what other owners have asked, and read their solutions.

Ask a question ↗

Traffic Light

Loading discussions…

View all on the community ↗Read here. Sign in to the community to post or reply.
Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk03.

Order or missing parts?

Email us or reply to your order, and quote tk03 — 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.