Alphenol NPA700 sensor IIC address change

Other Hardware Sensors
1

I am able to change the address of NPA730 with the following code. However when i do this the sensor returns bit 14 and 15 high which indicates a sensor error. In the following code am i causing this issue? Note the bits are low before i change the address.

#include "Wire.h"

int OldI2CAddress = 0;
int NewI2CAddress = 0;
int i = 0;

byte data[10];

int readline(int readch, char *buffer, int len)
{
static int pos = 0;
int rpos;

if (readch > 0) {
switch (readch) {
case '\n': // Ignore new-lines
break;
case '\r': // Return on CR
rpos = pos;
pos = 0; // Reset position index ready for next time
return rpos;
default:
if (pos < len - 1) {
buffer[pos++] = readch;
buffer[pos] = 0;
}
}
}
// No end of line has been found, so return -1.
return -1;
}

void ScanI2CBus()
{
byte error, address;
int nDevices;
digitalWrite(13, HIGH); //switches sensor on
delay(1);

Serial.println("Scanning...");

nDevices = 0;
for (address = 1; address < 127; address++ )
{

  // The i2c_scanner uses the return value of
  // the Write.endTransmisstion to see if
  // a device did acknowledge to the address.
  Wire.beginTransmission(address);
  error = Wire.endTransmission();

  if (error == 0)
  {
    Serial.print("I2C device found at address ");
    Serial.print(address, DEC); Serial.print(" (DEC) ");
    Serial.print(address, HEX); Serial.println (" (HEX) ");

    nDevices++;
  }
  else if (error == 4)
  {
    Serial.print("Unknow error at address ");
    Serial.println(address, DEC);
  }
}
if (nDevices == 0)
  Serial.println("No I2C devices found\n");
else
  Serial.println("done\n");

}

void ChangeAddress() {
digitalWrite(13, LOW);        //switches sensor off
delay(5);
digitalWrite(13, HIGH);        //switches sensor on
delay(1);

// Enter Command Mode
Wire.beginTransmission(OldI2CAddress); Wire.write(0xA0); Wire.write(0x00); Wire.write(0x00);
Wire.endTransmission();   // end transmission
delay(1);

// Read Status EEPROM Word 02
Wire.beginTransmission(OldI2CAddress); Wire.write(0x02); Wire.write(0x00); Wire.write(0x00);
Wire.endTransmission();   // end transmission
delay(1);
// Fetch

// data fetch of status
Wire.requestFrom(OldI2CAddress, 3);
data[0] = Wire.read();
data[1] = Wire.read();
data[2] = Wire.read();

//calculate address value from bits 9:3 of 2nd and 3rd bytes
data[3] = ((data[1] & B00000011) << 5) | (data[2] >> 3);

// print byte and calculated values
// Serial.print(data[0]); Serial.print(","); Serial.print(data[1]); Serial.print(",");Serial.print(data[2]);
// Serial.print("Address In Memory: 0x"); if (data[3] < 16){Serial.print("0");} Serial.println(data[3], HEX);

// compile byte values from required new address value
data[6] = ((NewI2CAddress >> 5) | 12);
data[7] = (NewI2CAddress << 3);
//Serial.print(data[1],BIN); Serial.print("\t"); Serial.print(data[2],BIN); Serial.println(",");
//Serial.print(data[6],BIN); Serial.print("\t"); Serial.print(data[7],BIN); Serial.println(",");

//Write New Address to EEPROM
Wire.beginTransmission(OldI2CAddress); Wire.write(0x42); Wire.write(data[6]); Wire.write(data[7]);
 Wire.endTransmission();   // end transmission

// Set to Normal Mode
Wire.beginTransmission(OldI2CAddress); Wire.write(0x80); Wire.write(0x00); Wire.write(0x00);
Wire.endTransmission();   // end transmission

}

// the setup function runs once when you press reset or power the board
void setup() {
Serial.begin(9600);
while (!Serial);
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
Wire.begin();
Serial.println("Amphenol Advanced Sensors");
Serial.println("Arduino NPA700 Monitor");
Serial.println("ScanI2Cbus now");
ScanI2CBus();
digitalWrite(13, HIGH);
}

// the loop function runs over and over again forever
void loop() {
static char buffer[80];

if (OldI2CAddress <= 0 & i <= 0)
{
Serial.println("Enter Address to Change in Decimal");
i = 1;
}

if (OldI2CAddress <= 0) {
if (readline(Serial.read(), buffer, 80) > 0) {
OldI2CAddress = atoi(buffer);
Serial.print("You entered old: ");
Serial.print(OldI2CAddress);
Serial.println(" ");

}

}
if (OldI2CAddress > 0 & NewI2CAddress <= 0 & i == 1) {
Serial.println("Enter New Address in Decimal");
i = 2;
}

if (OldI2CAddress > 0 & NewI2CAddress <= 0) {

if (readline(Serial.read(), buffer, 80) > 0) {
  NewI2CAddress = atoi(buffer);
  Serial.print("You entered new: ");
  Serial.print(NewI2CAddress);
  Serial.println(" ");
}

}
if (OldI2CAddress > 0 & NewI2CAddress > 0 & i == 2) {
Serial.println("Are these values correct?");
i = 3;
}
if (OldI2CAddress > 0 & NewI2CAddress > 0) {
if (readline(Serial.read(), buffer, 80) > 0) {
String answer = buffer;
if (answer == "y" | answer == "Y" | answer == "yes" | answer == "Yes" | answer == "YES") {

    i = 4;
    //Sub routine to enter command mode, change address, and revert to normal mode, no reboot.
    ChangeAddress();
    Serial.println("Change Made");
    
    Serial.print("Before Reboot ");
    ScanI2CBus();

    //reboot sensor by power off-on
    digitalWrite(13, LOW); delay(100); digitalWrite(13, HIGH); delay(1);

    Serial.print("After Reboot ");
    ScanI2CBus();
  }
    else
    {
      i = 0;
      OldI2CAddress = 0 ;
      NewI2CAddress = 0;
    }
  }
}

}

2

Please read how to format and send your code to the forum.

For proofreading a short test program were appreciated.

Use of OldI2CAddress after address change looks strange to me.

I2C addresses should be > 8.

Are you sure that '&' is correct inside "if" statement?

3

You're not reading the sensor's status register after changing address to verify if it reports an internal error.

You should read back register 0x02 (EEPROM status word) after reboot, then check if bit 15 (NVM error) or bit 14 (sensor fault) is high.

Example:

Wire.beginTransmission(NewI2CAddress);
Wire.write(0x02); Wire.write(0x00); Wire.write(0x00);
Wire.endTransmission();
Wire.requestFrom(NewI2CAddress, 3);
byte s0 = Wire.read(); byte s1 = Wire.read(); byte s2 = Wire.read();
uint16_t status = (s1 << 8) | s2;
Serial.print("Status: 0x"); Serial.println(status, HEX);
4

Addressing Your sensor Issue:

Your problem is not unexpected, and your wiring may be the root cause. Since hardware is involved, it’s crucial to provide an accurate, annotated schematic of your circuit as it is currently wired. Please note that Fritzing diagrams are not considered proper schematics; they are wiring diagrams and are often not helpful for troubleshooting.

What to Include:

  1. Annotated Schematic: Show all connections, including power, ground, and power sources. This helps us understand how your circuit is set up and identify any potential issues.
  2. Technical Information Links: Provide links to technical documentation for each hardware device used in your setup. Avoid links to sales sites like Amazon, as they usually lack the necessary technical details. We need complete specifications to help you effectively.
  3. Additional Information Needed: If the above details are incorrect, more information is required. Tell us what hardware and software you are using, the format of any data (like map data), and how your system determines its position. For example, if your project involves a robot, describe how it navigates and what computers are involved.
  4. Code Without code we cannot see the interrelationship between the code and hardware.

Why This Matters:

We have no way of knowing the specifics of your setup unless you provide that information. Clear and detailed descriptions enable us to offer the most accurate help possible. Without these details, it’s difficult to diagnose and solve the issues you're experiencing. You should check this link: How to get the best out of this forum

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