The TK01 at an angle: a black board with a gold-plated border and a large round blue LED standing up near the top, a small black resistor to its left, two big mounting holes, XL LED printed along the right-hand edge above a boxed ACTIVE HIGH, and a right-angle header whose four pins point out past the bottom edge.

You have thistk01

XL LED

A 10 mm blue LED with its 150 Ω resistor already fitted, driven by one pin: the first output most people ever drive, and the light every later lesson uses to show that something happened.

Current: 13mA from 5 V, 2 from 3.3 V
Resistor: 150Ω, already fitted
LED: 10mm, blue
Wires: 2GND and SIGNAL

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

Turn it over, switch between on/off and brightness, and see that only GND and SIGNAL need a wire: the two NC holes are connected to nothing.

Product questions & answers ↓

The whole handbook9 articles · 40 min Quick referencePDF · 514 KB XL LED model (GLB)GLB · 811 KB XL LED CAD (STEP)ZIP · 577 KB XL LED drawing (PDF)PDF · 2.4 MB XL LED drawing (DXF)ZIP · 40 KB Pinout 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 ↗

XL LED

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 tk01.

Order or missing parts?

Email us or reply to your order, and quote tk01 — 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.