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Updated MPR121 (markdown)

Michael Ingraham 2019-06-14 14:21:55 -04:00
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MPR121.md

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# MPR121 I2C Proximity Capacitive Touch Sensor Controller
* 12-button or touch pad I2C controller
# MPR121 I<sub>2</sub>C Proximity Capacitive Touch Sensor Controller
* 12-button or touch pad I<sub>2</sub>C controller
* Driver supports up to 4x MPR121 controllers (= 48 buttons per ESP8266)
* Electrodes can be covered with adhesive paper and adhesive plastic foil for labeling and symbols
* Break-out and touch button PCBs ~ 2,- € at [AliExpress](https://www.aliexpress.com/wholesale?catId=0&initiative_id=&SearchText=mpr121)
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| SDA | GPIO SDA |
| IRQ | NC |
### I2C address selection
### I<sub>2</sub>C address selection
Connect the ADD(R) pin/pad to one of the following pins/pads:
| Address | ADD(R) |
@ -39,12 +39,12 @@ Connect the ADD(R) pin/pad to one of the following pins/pads:
| 0x5D | GPIO SCL |
### Tasmota configuration
Compile Tasmota with `#define USE_MPR121` uncommented in `user_config.h`
Compile Tasmota with `#define USE_MPR121` uncommented in `my_user_config.h`
The driver will detect the I2C addresses of the MPR121s automatically.
The MPR121 chip (or breakout board) must be connected to the ESP8266 and the I2C GPIO pins must be configured:
The driver will detect the I<sub>2</sub>C addresses of the MPR121s automatically.
The MPR121 chip (or breakout board) must be connected to the ESP8266 and the I<sub>2</sub>C GPIO pins must be configured:
![I2C GPIO configuration](https://raw.githubusercontent.com/arendst/arendst.github.io/master/media/wemos/wemos_sht30_config_marked.jpg)
![I<sub>2</sub>C GPIO configuration](https://raw.githubusercontent.com/arendst/arendst.github.io/master/media/wemos/wemos_sht30_config_marked.jpg)
## Generally available types of breakout boards