FDC2214

Hi Yibo Yu,

Thank you for answering we look up FDC2214 datasheet and use register address for channel-1

byte CH0MSB = 0x02; //Most significant bits of the conversion result on channel 0. [11:0]-->>[27:16]
byte CH0LSB = 0X03; //Less significant bits of the conversion result on channel 0. [15:0]-->>[15:0]

writeConfig(FDC, 0x15, 0x10, 0x01);//CLOCK_DIVIDERS_CH0
writeConfig(FDC, 0x1F, 0xF8, 0x00);//DRIVE_CURRENT_CH0
writeConfig(FDC, 0x11, 0x00, 0x0A);//SETTLECOUNT_CH0
writeConfig(FDC, 0x09, 0x69, 0xE8);//RCOUNT_CH0
writeConfig(FDC, 0x19, 0x00, 0x00);//ERROR_CONFIG
writeConfig(FDC, 0x1B, 0x02, 0x0C);//MUX_CONFIG
writeConfig(FDC, 0x1A, 0x14, 0x41);//CONFIG

But it is not right . What do you think about this matter?

Regards,
Unal

Hi,

I communicated fdc 2214 with ardunio, but i read only ch0. I want read another channel in same code, i write adreesses ch1, ch2 in datasheet but i read only value 0.I think, we have same problem.
please hepl me.
Regards,
Orkun.

Hi Rachel Liao ,

we want to take capacitive sensor FDC2214 data with Arduino SCL , SDA pın.when we take Channel-0 , we  read data for channel-0  with arduino code :

//unsigned long 4 Bytes 0 to 4,294,967,295
//long 4 Bytes -2,147,483,648 to 2,147,483,647
//float 4 Bytes 1.2E-38 to 3.4E+38 (6 decimal places)
#include <Wire.h>
#define DT 1 //Derivative threshold.
#define IT 1500 //Integration threshold.
#define HAND 3500 // Hand threshold.
#define AVGN 3 //Degree of the IIR filter.
#define L 1 //Leakege Factor.

byte FDC = 0x2B;// FDC address either 0x2A or 0x2B;
byte CH0MSB = 0x00; //Most significant bits of the conversion result on channel 0. [11:0]-->>[27:16]
byte CH0LSB = 0X01; //Less significant bits of the conversion result on channel 0. [15:0]-->>[15:0]


void LedOn() {
digitalWrite(2, HIGH);
}

void LedOff() {
digitalWrite(2, LOW); //Target approaching!
}

//Build the complete conversion result from the specific channel
unsigned long readChannel() {
unsigned long val = 0;
word c = 0;
word d = 0;
c = readValue(FDC, CH0MSB); 
d = readValue(FDC, CH0LSB);
val = c;
val <<= 16;
val += d;
return val;
}

//Read bytes from register channel specified
word readValue (int FDC, int reg) {
byte a = 0;
byte b = 0;
word value = 0;
Wire.beginTransmission(FDC);
Wire.write(reg);
Wire.endTransmission();
Wire.requestFrom(FDC, 2);
while (Wire.available())
{
a = Wire.read();
b = Wire.read();
}
value = a;
value <<= 8;
value += b;
return value;
}


//IIR Filter
long average( unsigned long meassure, long avg_1, int n) {
long avg = ((avg_1 * n) - avg_1 + meassure) / n;
return avg;
}

void monitor() {
long current = readChannel();
long delta = 0, Integral = 0, Integral_1 = 0;
long avg = 0, avg_1 = 0, last = 0;
//avg = current;

for (;;) {

last = current;// Shift register. The variable last will storage the current value for the next iteration.
current = average(readChannel(), last, AVGN);//New value for current return from IIR filter --> function average(meassure, avg_1, n)

//Derivative integration algorithm
delta = current - last;

if (abs(delta) > DT) {
Integral = Integral_1 + delta;
}
else {
Integral = Integral_1;
}

if (abs(Integral) >= IT && abs(Integral) < HAND) {
LedOff();
Integral_1 = Integral;
Serial.println("Pot approaching...");
}
else {
LedOn();
Integral_1 = Integral * L;
}
Serial.println(abs(Integral));
delay(100);
}
}


//Configuring the FDC2214
void writeConfig(int FDC, byte reg, byte MSB, byte LSB) {
Wire.beginTransmission(FDC);
Wire.write(reg);
Wire.write(MSB);
Wire.write(LSB);
Wire.endTransmission();
}

void Configuration() {
writeConfig(FDC, 0x14, 0x20, 0x01);//CLOCK_DIVIDERS_CH0
writeConfig(FDC, 0x1E, 0xF8, 0x00);//DRIVE_CURRENT_CH0
writeConfig(FDC, 0x10, 0x00, 0x0A);//SETTLECOUNT_CH0
writeConfig(FDC, 0x08, 0x69, 0xE8);//RCOUNT_CH0
writeConfig(FDC, 0x19, 0x00, 0x00);//ERROR_CONFIG
writeConfig(FDC, 0x1B, 0x02, 0x0C);//MUX_CONFIG
writeConfig(FDC, 0x1A, 0x14, 0x41);//CONFIG
}


void setup() {
Wire.begin();
Serial.begin(9600);
Serial.println("Starting");
pinMode(2, OUTPUT);
Configuration();
}

void loop() {
Wire.beginTransmission(FDC);
monitor();
}

this code is right for channel-0 but ;

we look up datasheet  and we change Register address for channel-1 :

byte FDC = 0x2B;// FDC address either 0x2A or 0x2B;
byte CH0MSB = 0x02; //Most significant bits of the conversion result on channel 0. [11:0]-->>[27:16]
byte CH0LSB = 0X03; //Less significant bits of the conversion result on channel 0. [15:0]-->>[15:0]

void Configuration() {
writeConfig(FDC, 0x15, 0x20, 0x01);//CLOCK_DIVIDERS_CH0
writeConfig(FDC, 0x1F, 0xF8, 0x00);//DRIVE_CURRENT_CH0
writeConfig(FDC, 0x11, 0x00, 0x0A);//SETTLECOUNT_CH0
writeConfig(FDC, 0x09, 0x69, 0xE8);//RCOUNT_CH0
writeConfig(FDC, 0x19, 0x00, 0x00);//ERROR_CONFIG
writeConfig(FDC, 0x1B, 0x02, 0x0C);//MUX_CONFIG
writeConfig(FDC, 0x1A, 0x14, 0x41);//CONFIG
}

but data is not right.I send to picture for Arduino and FDC2214 electronic schema.

Where is wrong this code and schema.

Please help me!!!

Regards,

Unal

Hi Rachel Liao ,

I do what you say but still doing reading from Channel-0 , so was annoying situation. Where did you find the address 0x54.
I dont find this address in datasheet.

Thanks,

Unal

Hi Rachel,

I am very sorry. But I dont read Channel-1 or channel-2 or channel-3 data.
I made the changes you said but it is not.

Can you writing Channel-1 Register address values.
And I have got a new problem My capacitive gain is very low. How it is to increase capacitive values.

What would you suggest me about sensitive capacitive sensor. I want to do sensitive proccess .

Thanks ,

Unal

Hi Unal,

Could you probe the waveforms on CH0 and CH1 with their respective configurations? What are your oscillation frequencies and amplitudes?

Thanks,

Rachel

Hi Rachel,

Oscillation frequncies: 33 Mhz but there is not any amplitudes. İt is cihanging.
For example sometimes amplitudes: 100 pF
Sometimes amplitudes: 80 PF

Thanks,

Unal

Hi Unal,

Did you mean 3.3 MHz?

I meant probe the signal on the CH0 and CH1 lines using an oscilloscope. I'm curious to see if the signals are both a half-sine wave (as it should be) with the amplitudes between 1.2 V and 1.8 V.

Thanks,
Rachel