FDC2214 Arduino Library

Library for Texas Instruments FDC2xxx family capacitative sensor front-ends.

Supported devices

FDC2112

FDC2114

FDC2212

FDC2214

Revision

1.0 - 1 - Initial release

1.1 - 1 - Fixed channel 2 and 3 support.

1.1 - 2 - Added support for internal oscillator. Not reccomended for any fairly precise aplication.

Usage

Include header, Make instance, Init and acquire data.

#include "FDC2214.h"
FDC2214 capsense(FDC2214_I2C_ADDR_0); // Use FDC2214_I2C_ADDR_1 for ADDR = VCC
...
void setup() {
    ...
    Wire.begin();
    bool capOk = capsense.begin(0x3, 0x4, 0x5, false); //setup first two channels, autoscan with 2 channels, deglitch at 10MHz, use external oscillator 
    ...
}
void loop(){
    ...
        unsigned long capa[i] = capsense.getReading28(i);  
    ...
}

Hardware

FDC2xxx family is 3.3V powered, unlike most of Arduinos, that are powered form 5V. To use this chip with Arduino, you will have to either:

use 3.3V version of Arduino, like Arduino Pro Mini 8MHz 3.3V

use I2C level shifter to interface the FDC chip with arduino.

To run examples, connect FDC with arduino as follows:

ARDUINO <--> FDC

A4 <-------> SDA

A5 --------> SCL

GND -------> ADR

GND -------> SD

Tools

To view nice real-time graph of the sensor output, it is highly recommended to use tool like SerialPlot. https://bitbucket.org/hyOzd/serialplot Binary downloads avialable here: https://bitbucket.org/hyOzd/serialplot/downloads/

Setting up port:

Setting up data format:

Proximity sensing waveform:

Noise waveform: