Touch Sensing

Teensys with hardware touch support

The Teensy LC, 3.0, 3.1, 3.2, and 3.6 have special support for touch sensing using the touchread call. Here are some pages and threads that talk about this:

• http://little-scale.blogspot.com/2017/05/teensy-36-basics-touchread.html
• http://njhurst.com/blog/01356576041
• https://hackaday.io/project/8371-wooden-sensor-box-w-2-rotary-disks/log/27706-the-touch-sensing-and-touchread
• https://stevendigitaltech.wordpress.com/2015/04/25/lab-11-touchread/
• https://electronics.stackexchange.com/questions/411729/how-can-i-make-a-capacitive-touch-panel-that-can-sense-position
• https://electricnoodlebox.wordpress.com/tutorials/paint-a-midi-controller-with-teensy/

Teensys without hardware touch support

Unfortunately, the Teensy 3.5, 4.0, and 4.1 do NOT have touch sensitive pins. The following libraries may help provide touch support for these systems:

• https://github.com/adrianfreed/FastTouch.git
• https://github.com/PaulStoffregen/CapacitiveSensor

External touch support

There are also I2C or SPI devices that provide touch sensing without the microprocessor board needing to support touch sensing. There are self contained modules, or displays with touch sensing:

• https://www.adafruit.com/product/1602
• https://www.pjrc.com/store/display_ili9341_touch.html