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Amazon.com: WWZMDiB 6Pcs TTP223B Digital Capacitive Touch Sensor Switch Module DC 2~5.5V for Arduino Raspberry Pi DIY : Electronics
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Hardware | MPR121 Capacitive Touch Sensor on Raspberry Pi & BeagleBone Black | Adafruit Learning System
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ALAMSCN 10PCS TTP223 TTP223B Digital Touch Switch Capacitive Sensor Button Module Self Locking for Arduino Raspberry Pi DIY (5pcs TTP223+5pcsTTP223B): Amazon.com: Industrial & Scientific
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10pcs TTP223B Digital Touch Capacitive Sensor Switch Module DIY for Arduino Raspberry Pi|Integrated Circuits| - AliExpress
![Overview | MPR121 Capacitive Touch Sensor on Raspberry Pi & BeagleBone Black | Adafruit Learning System Overview | MPR121 Capacitive Touch Sensor on Raspberry Pi & BeagleBone Black | Adafruit Learning System](https://cdn-learn.adafruit.com/assets/assets/000/021/914/medium800/sensors_DSC00759.jpg?1419366936)