I2C & pcfPCF8591 nothing

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,

My pcf doesn't tel me the value on the 1st chanel. Can u tell me why ???
(A0=1, A2=0, A3=0)

Thanks a lot !
PT

#include <Wire.h>

#define PCF8591_1 B1001001 // #define PCF8591_2 B1001011
int _data;

void setup()
{
  Wire.begin(); 
  Serial.begin(9600);

}
void loop() {
 Wire.beginTransmission(PCF8591_1);
 Wire.send(B0000000);
 Wire.endTransmission();
 
 Wire.requestFrom(PCF8591_1, 2);
 while (Wire.available()) {
    _data = Wire.receive();
 Serial.print("Ana Read: ");
 Serial.print(_data, BIN);   
 }
Serial.println("\tc");
delay(800);
}
2

shame one me.

In fact, I spend 3 hours trying to understand why it was not workin.
In fact, I didn't notice that Sda and Sdc were Analog Pin. (I cwans connect to the digital pins)