68 lines
1.4 KiB
Markdown
68 lines
1.4 KiB
Markdown
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<!--
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---
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name: Capacitive Touch HAT
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class: board
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type: touch
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formfactor: HAT
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manufacturer: Adafruit
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description: Create electronics that can react to human touch with up to 12 individual sensors
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url: https://www.adafruit.com/products/2340
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github: https://github.com/adafruit/Adafruit_Python_MPR121
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buy: https://www.adafruit.com/products/2340
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image: 'adafruit-cap-mpr121.png'
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pincount: 40
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eeprom: yes
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power:
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'1':
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ground:
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'6':
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'9':
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'14':
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'20':
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'25':
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'30':
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'34':
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'39':
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pin:
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'3':
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mode: i2c
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'5':
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mode: i2c
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i2c:
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'0x5A':
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name: Cap Touch
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device: mpr121
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install:
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'devices':
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- 'i2c'
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'apt':
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- 'python-smbus'
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- 'python3-smbus'
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- 'python-dev'
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- 'python3-dev'
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-->
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# Capacitive Touch HAT
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This Raspberry Pi add-on board provides 12 capacitive touch inputs and all the logic to read them over a simple I2C communication bus.
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Baded on the MPR121 chip, this HAT allows you to create electronics that can react to human touch, with up to 12 individual sensors.
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## Code
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```python
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from Adafruit_MPR121 import MPR121
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from time import sleep
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cap = MPR121.MPR121()
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last_touched = cap.touched()
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while True:
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current_touched = cap.touched()
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for i in range(12):
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pin_bit = 1 << i
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if current_touched & pin_bit and not last_touched & pin_bit:
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print("{} touched!".format(i))
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last_touched = current_touched
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sleep(0.1)
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```
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