arduino 多路I2C设备(MLX90614 )地址修改 -

标题: arduino 多路I2C设备(MLX90614 )地址修改 [打印本页]

作者: 付振 时间: 2019-6-7 17:51
标题: arduino 多路I2C设备(MLX90614 )地址修改
红外温度传感器 MLX90614
// remap_mlx90614.ino
#include "i2cmaster.h"
// New slave address, purposefully left shifted
byte NewMLXAddr = 0x39;                               //传感器新I2C地址；传感器1,2,3,4,5依次为0x1A,0x2A,0x3A,0x4A,0x5A
// 0x5A is the default address - uncomment this to set it back
// byte NewMLXAddr = 0x5A;

void setup(){
Serial.begin(9600);
Serial.println("Setup...");
// Initialise the i2c bus, enable pullups and then wait
i2c_init();
PORTC = (1 << PORTC4) | (1 << PORTC5);
delay(5000);
// Read current address bytes
ReadAddr(0);
// Change address to new value (NewMLXAddr);
ChangeAddr(NewMLXAddr, 0x00);
// Read address bytes
ReadAddr(0);
Serial.print("> Cycle power NOW to set address to: ");
Serial.print(NewMLXAddr, HEX);
Serial.println(" - you have 10 seconds");
// Cycle power to MLX during this 10 second pause
delay(10000);
// Read temperature using default address
ReadTemp(0);
// Read temperature using new address (note left bit shift for reading)
ReadTemp(NewMLXAddr<<1);
Serial.println("**---DONE---**");
}
void loop(){
   delay(5000);
   ReadTemp(NewMLXAddr<<1);
}
word ChangeAddr(byte NewAddr1, byte NewAddr2) {
Serial.println("> Change address");
// Send start condition and write bit
i2c_start_wait(0 + I2C_WRITE);
// Send command for device to return address
i2c_write(0x2E);
// Send low byte zero to erase
i2c_write(0x00);
// Send high byte zero to erase
i2c_write(0x00);
if (i2c_write(0x6F) == 0) {
   // Release bus, end transaction
   i2c_stop();
   Serial.println("> Data erased.");
}
else {
   // Release bus, end transaction
   i2c_stop();
   Serial.println("> Failed to erase data");
   return -1;
}
Serial.print("> Writing data: ");
Serial.print(NewAddr1, HEX);
Serial.print(", ");
Serial.println(NewAddr2, HEX);
for (int a = 0; a != 256; a++) {
   // Send start condition and write bit
   i2c_start_wait(0 + I2C_WRITE);
   // Send command for device to return address
   i2c_write(0x2E);
   // Send low byte zero to erase
   i2c_write(NewAddr1);
   // Send high byte zero to erase
   i2c_write(NewAddr2);
   if (i2c_write(a) == 0) {
   // Release bus, end transaction then wait 10ms
   i2c_stop();
   delay(100);
   Serial.print("> Found correct CRC: 0x");
   Serial.println(a, HEX);
   return a;
   }
}
// Release bus, end transaction
i2c_stop();
Serial.println("> Correct CRC not found");
return -1;
}
void ReadAddr(byte Address) {
Serial.println("> Read address");
// Inform the user
Serial.print("  MLX address: ");
Serial.print(Address, HEX);
Serial.print(", Data: ");
// Send start condition and write bit
i2c_start_wait(Address + I2C_WRITE);
// Send command for device to return address
i2c_write(0x2E);
i2c_rep_start(Address + I2C_READ);
// Read 1 byte and then send ack (x2)
Serial.print(i2c_readAck(), HEX);
Serial.print(", ");
Serial.print(i2c_readAck(), HEX);
Serial.print(", ");
Serial.println(i2c_readNak(), HEX);
i2c_stop();
}
float ReadTemp(byte Address) {
int data_low = 0;
int data_high = 0;
int pec = 0;
Serial.println("> Read temperature");
// Inform the user
Serial.print("  MLX address: ");
Serial.print(Address, HEX);
Serial.print(", ");
i2c_start_wait(Address + I2C_WRITE);
// Address of temp bytes
i2c_write(0x07);
// Read - the famous repeat start
i2c_rep_start(Address + I2C_READ);
// Read 1 byte and then send ack (x2)
data_low = i2c_readAck();
data_high = i2c_readAck();
pec = i2c_readNak();
i2c_stop();
// This converts high and low bytes together and processes the temperature
// MSB is a error bit and is ignored for temperatures
// Zero out the data
float temp = 0x0000;
// This masks off the error bit of the high byte, then moves it left
// 8 bits and adds the low byte.
temp = (float)(((data_high & 0x007F) << 8) + data_low);
temp = (temp * 0.02) - 273.16;
Serial.print(temp);
Serial.println(" C");
return temp;
}

激光测距传感器 ATK-VL53l0X
#include "Adafruit_VL53L0X.h"

Adafruit_VL53L0X lox=Adafruit_VL53L0X();
void setup() {
  // put your setup code here, to run once:
lox.begin(0x29);
}
void loop() {
  // put your main code here, to run repeatedly:
}

I2C地址修改.zip

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作者: Euler271828 时间: 2019-12-10 17:36
你好，这个i2cmaster.h的库文件哪里可以下载呀

作者: SuperCat995 时间: 2019-12-21 02:54
你好，请问可以用在其他传感器上嘛？

作者: 碌碌无为 时间: 2020-1-14 23:11
若能任意修改I2C地址，那在设计中绝对是非常有意义的，感谢楼主分享。

作者: 付振 时间: 2020-3-23 19:30

Euler271828 发表于 2019-12-10 17:36
你好，这个i2cmaster.h的库文件哪里可以下载呀

这个在arduinoIDE里面管理库里面就有搜索一下

作者: 付振 时间: 2020-3-23 19:33

SuperCat995 发表于 2019-12-21 02:54
你好，请问可以用在其他传感器上嘛？

这个抱歉，我不清楚但是那个查询IIC地址的可以，修改的那个程序如果有条件的话可以一试
还有一个办法就是不同的设备例如MPU6050和OLED可采用不同对的普通引脚设置为SCL、SDA，从而避免对默认地址的修改

作者: 付振 时间: 2020-3-23 19:34

碌碌无为发表于 2020-1-14 23:11
若能任意修改I2C地址，那在设计中绝对是非常有意义的，感谢楼主分享。

这个需要对具体的设备来论，不同的IIC设备会有一个地址范围，范围内均可以，这方面可根据数据手册查找

作者: accumulate0 时间: 2021-1-30 21:26
关于changeaddr那部分代码，我看到楼主你用到了NewAddr1和2，但是没有看到具体哪一步改动的地址那，NewAddr1时OX39,NewAddr2时ox00，是怎么修改5个设备的地址的那？还有一个HEX的变量也没有看到在哪里引用的那？"i2cmaster.h"里面也没有找到

作者: tyming 时间: 2025-3-23 17:39
arduino 多路I2C設備,esp8266 OK??

作者: tyming 时间: 2025-3-23 17:40
arduino 多路I2C設備, esp8266 可以嗎?

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