This is a placeholder topic for “Zio Qwiic Loudness Sensor” comments.
The Zio Qwiic Loudness Sensor is an I2C device making it easy to measure the noise level in your next project. No soldering required. The Loudness sensor can output…
Read morehow can I change I2C address?
attached to “Adafruit ESP32 Feather V2” and tried to change this sensor’s address.
but it saids
Zio Qwiic Loudness Sensor Master Awake
Check Connections. Slave not found.
Zio Qwiic Loudness Sensor found!
Check Connections. No slave found.
success
after saw that message on serial monitor, checking i2c address with I2C scanner from example3. but it still 0x38.
I also tried to pin high to “NEOPIXEL_I2C_POWER” as mentiond on adafruit documentation. but it doesn’t changed at all.
did I miss something ?
here is the whole code.
/******************************************************************************
Zio Qwiic Loudness Sensor Example 2 - Change I2C Address
Harry
September 25, 2018
This sketch demonstrates how to change the I2C Address
of the Zio Qwiic Loudness Sensor. The new address will be saved to the
Sensor's EEPROM.
The factory default slave address is 0x38.
Note: If the Zio Qwiic Loudness Sensor is connected but unresponsive,
try Example 3 - I2C_Scanner to find the current address of the Sensor.
Only valid address can be saved to the Sensor's EEPROM. If an invalid address is
sent, the Sensor will ignore the address change without notifying the user.
******************************************************************************/
#include <Wire.h>
#define COMMAND_LED_OFF 0x00
#define COMMAND_LED_ON 0x01
#define COMMAND_CHANGE_ADDRESS 0x03
volatile byte qwiicAddress = 0x38; //Default Address
//const int I2C_POWER = 2;
void setup() {
Serial.begin(9600);
Serial.println("Zio Qwiic Loudness Sensor Master Awake");
pinMode(NEOPIXEL_I2C_POWER, OUTPUT);
digitalWrite(NEOPIXEL_I2C_POWER, HIGH);
Wire.begin(); // join the I2C Bus
Serial.print("NEOPIXEL_I2C_POWER pin : ");
Serial.println(NEOPIXEL_I2C_POWER);
Wire.beginTransmission(qwiicAddress); // transmit to device
//check here for an ACK from the slave
if (Wire.endTransmission() != 0 ) {
Serial.println("Check Connections. Slave not found.");
}
Serial.println("Zio Qwiic Loudness Sensor found!");
ledOn(); // Turn on the LED (at address 0x28)
delay(1000);
byte error = changeAddress(0x41); // Change the Sensor's address to 0x29
ledOff(); // Turn off the LED (at address 0x29)
delay(1000);
changeAddress(0x00); // Try to change address to Invalid Address.
if (error != true) {
Serial.println("!!!!! invalid address" );
}
Serial.println("success");
}
void loop() {
}
// changeAddress() takes a 7 bit I2C Address
// and writes it to the Sensor. This function
// checks to see if the address is between
// 0x07 and 0x78. If valid, the new address is
// saved to the Sensor's EEPROM. If not valid
// address is not changed and is ignored.
// This function returns true if successful and
// false if unsuccessful.
boolean changeAddress(byte address) {
Wire.beginTransmission(qwiicAddress);
//check here for an ACK from the slave
if (Wire.endTransmission() != 0) {
Serial.println("Check Connections. No slave found.");
return (false);
}
//check if valid address.
if (address < 0x07 || address > 0x78) {
Serial.println("Invalid I2C address");
return (false);
}
//valid address
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_CHANGE_ADDRESS);
qwiicAddress = address;
Wire.write(qwiicAddress);
Wire.endTransmission();
return (true); //Success!
}
// ledOn() turns on the relay at the SLAVE_ADDRESS
// Checks to see if a slave is connected and prints a
// message to the Serial Monitor if no slave found.
void ledOn() {
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_LED_ON);
Wire.endTransmission();
}
// ledOff() turns off the relay at the SLAVE_ADDRESS
// Checks to see if a slave is connected and prints a
// message to the Serial Monitor if no slave found.
void ledOff() {
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_LED_OFF);
Wire.endTransmission();
}
thanks .
1 Like
Hi Donghoon,
Welcome to the forum 
Nothing obvious jumps out at me as causing the problem. Can you please send a photo of how you’ve got the Loudness sensor connected? Sometimes a second set of eyes can make all the difference.
1 Like
Hi Donghoon,
Welcome to the forum!!
It looks like you havent over-wrote the new address, the variable on line 24 holds it and will be written to the onboard EEPROM so it remembers what address it should be.
This code ought to change it to 0x39
/******************************************************************************
Zio Qwiic Loudness Sensor Example 2 - Change I2C Address
Harry
September 25, 2018
This sketch demonstrates how to change the I2C Address
of the Zio Qwiic Loudness Sensor. The new address will be saved to the
Sensor's EEPROM.
The factory default slave address is 0x38.
Note: If the Zio Qwiic Loudness Sensor is connected but unresponsive,
try Example 3 - I2C_Scanner to find the current address of the Sensor.
Only valid address can be saved to the Sensor's EEPROM. If an invalid address is
sent, the Sensor will ignore the address change without notifying the user.
******************************************************************************/
#include <Wire.h>
#define COMMAND_LED_OFF 0x00
#define COMMAND_LED_ON 0x01
#define COMMAND_CHANGE_ADDRESS 0x03
volatile byte qwiicAddress = 0x39; // Increase the address by 1
//const int I2C_POWER = 2;
void setup() {
Serial.begin(9600);
Serial.println("Zio Qwiic Loudness Sensor Master Awake");
pinMode(NEOPIXEL_I2C_POWER, OUTPUT);
digitalWrite(NEOPIXEL_I2C_POWER, HIGH);
Wire.begin(); // join the I2C Bus
Serial.print("NEOPIXEL_I2C_POWER pin : ");
Serial.println(NEOPIXEL_I2C_POWER);
Wire.beginTransmission(qwiicAddress); // transmit to device
//check here for an ACK from the slave
if (Wire.endTransmission() != 0 ) {
Serial.println("Check Connections. Slave not found.");
}
Serial.println("Zio Qwiic Loudness Sensor found!");
ledOn(); // Turn on the LED (at address 0x28)
delay(1000);
byte error = changeAddress(0x41); // Change the Sensor's address to 0x29
ledOff(); // Turn off the LED (at address 0x29)
delay(1000);
changeAddress(0x00); // Try to change address to Invalid Address.
if (error != true) {
Serial.println("!!!!! invalid address" );
}
Serial.println("success");
}
void loop() {
}
// changeAddress() takes a 7 bit I2C Address
// and writes it to the Sensor. This function
// checks to see if the address is between
// 0x07 and 0x78. If valid, the new address is
// saved to the Sensor's EEPROM. If not valid
// address is not changed and is ignored.
// This function returns true if successful and
// false if unsuccessful.
boolean changeAddress(byte address) {
Wire.beginTransmission(qwiicAddress);
//check here for an ACK from the slave
if (Wire.endTransmission() != 0) {
Serial.println("Check Connections. No slave found.");
return (false);
}
//check if valid address.
if (address < 0x07 || address > 0x78) {
Serial.println("Invalid I2C address");
return (false);
}
//valid address
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_CHANGE_ADDRESS);
qwiicAddress = address;
Wire.write(qwiicAddress);
Wire.endTransmission();
return (true); //Success!
}
// ledOn() turns on the relay at the SLAVE_ADDRESS
// Checks to see if a slave is connected and prints a
// message to the Serial Monitor if no slave found.
void ledOn() {
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_LED_ON);
Wire.endTransmission();
}
// ledOff() turns off the relay at the SLAVE_ADDRESS
// Checks to see if a slave is connected and prints a
// message to the Serial Monitor if no slave found.
void ledOff() {
Wire.beginTransmission(qwiicAddress);
Wire.write(COMMAND_LED_OFF);
Wire.endTransmission();
}
Liam
2 Likes
