AD7747 Arduino Library

Library for Analog devices AD7747 Capacitive sensing.

Supported devices

• AD7747

Usage

Import header and use AD7747 instance, Init and get data.

#include "AD7747.h"
AD7747 cap(_AD7747_ADDR_READ_, _AD7747_ADDR_WRITE_);
...
void setup() {
    ...
    Wire.begin();
    cap.debug_mode = false; //use it to activate log
    bool isConnect = cap.isDeviceConnected();//check device AD7747 is connect?

    if (isConnect)
    {
        cap.loadSettings();//load settings in AD7747
        Serial.println("connected");
    }
    ...
}
void loop(){
    ...
        uint32_t _raw_cap_ = cap.getCap(CAP_DATA_START);
    ...
}

Hardware

AD7747 3.3V or 5.0V powered.

To run examples, connect FDC with arduino as follows:

• ARDUINO <--> AD7747
• A4 <-------> SDA
• A5 --------> SCL
• A2 --------> RDY (optinal)

Tools

To view nice real-time graph of the sensor output, it is highly recommended to use tool like ArduinoSerialPlot.

sensing cap:

schematic: