You can buy small modules with capacitive touch detection ICs — most often it’s the TTP223, a single-button capacitive model with configurable output modes. These are designed to pair with a microcontroller or some simple logic-level input, but [Alain Mauer] wanted was to bring touch control to a simple LED strip. Not to be set deterred, he’s put together a simple TTP223-based switch board.
Initially, he made a prototype using one of the regular TTP223 boards as a module, but then transferred the full schematic onto a single PCB. The final board uses an NPN transistor capable of handling up to 3 amps to do the switching job, and Zener-based regulation to provide 5 V for the TTP223 itself from the 12 V input. [Alain] shares the schematic, as well as BOM together with Gerber files for a 2×3 panel in case you’re interested in adding a few of these handy boards to your parts bin.
The TTP223 is a ubiquitous and quite capable chip – we’ve seen it used for building a mouse with low actuation force buttons, a soft power switch, and even a UV-sensing talisman that’s equal parts miniature electronics and fascinating metalwork.
7 thoughts on “TTP223 Brings Simple Touch Controls To A LED Lamp”
Are there advantages to using a zener here? Lower noise for the captouch than a regulator?
It was the simplest and smallest solution to get the 12V under 5V
Nice, high five!
That’s a great chip for touch sensing. It will even work through wood and other nonconducting surfaces. I recall seeing a project somewhere (?) where it was used for a “secret-invisible” combination lock for a drawer.
Hi. I think ttn223 is a clone of attiny10 (which natively support qtouch library)
Sorry, I mean ttp223 a clone of attiny10
hmm that’s interesting! the attiny10 is a full-blown MCU, whereas the TTP223 is a single-purpose chip; they do come in the same package, but that’s where the similarities end for me? I’d like to learn more about why you believe this to be the case!
Please be kind and respectful to help make the comments section excellent. (Comment Policy)