Next are a couple of handpicked TTP datasheet links. There are not many trusty resources available for exact chip revisions used in profoundly different TTP modules, so going through the datasheets also bring certain disappointing results. Frankly you might find many conflicting documents. The TTP229B module is configured by default as just an 8 key module, but with the addition of a jumper installation, you can use all 16 buttons.įinding the proper TTP datasheets is a major difficulty. As far as I know, there are two versions of the same chip – TTP229-BSF with a serial 2-wire output interface, and TTP229-ASF with an I☬ interface. The TTP229 IC can independently handle the 8 touch pads or up to 16 touch pads. Next in the series is the 16 key touch pad module built around the TTP229 chip. The TTP224 module also has additional onboard jumpers by which you can set various modes.

On the other hand, this module doesn’t allow additional touch pads (just a single one), the TTP224 module is one fairly suitable pick for a 4 key touch pad interface.

While the aforementioned solution is good because you can always do more with the module, reducing the count of components in an external support circuitry. It’s worth noting that the most common TTP223 module, actually TTP223-BA6 module, available as a stamp-sized breakout board in red, has onboard jumpers for active high/low output mode selection, and momentary/toggle switch mode selection. The TTP223 IC at the heart of the module is a dedicated touch pad detector chip which offers a single capacitive touch key. It’s an interesting module – perfect for many hobby projects.

One of the easiest and inexpensive way to start is to pick a TTP223 module. If you are planning on building new touch sensitive electronics, you’ll eventually want to learn about using a variety of cheap capacitive touch sensor modules. Luckily, little capacitive touch sensor/switch modules are widely available online for a fair price and let you have some pretty cool features for your innovative electronics projects.

You can’t have a touch sensitive switch without a way to detect the presence of a finger! A touch sensor, especially a capacitive touch sensor, has some surprisingly sophisticated electronics to detect a fingertip.

Metal touch sensor bounce