淘宝上买了一个非接触式红外温度传感器，想检测煤气灶是否开着，看了custom I2C sensor，没有头绪啊，或者刷什么固件容易接入自定义传感器，求大神帮助。
附传感器的示例代码
#ifndef __MLX90615_H__
#define __MLX90615_H__
#include <Arduino.h>
#include "SoftI2CMaster.h"
/* which pin to use. For example, if you use digital pin 2 for
* SDA and digital pin 3 for SCL you have to use the following
* definitions:
* #define SDA_PIN 2
* #define SDA_PORT PORTB
* #define SCL_PIN 3
* #define SCL_PORT PORTB
*
*/
#define MLX90615_OBJECT_TEMPERATURE 0x27
#define MLX90615_AMBIENT_TEMPERATURE 0x26
#define AccessEEPROM 0x13
#define Default_Emissivity 0x4000
#define DEVICE 0x5B
class MLX90615 {
public:
void init() {
i2c_init();
}
/****************************************************************
* Function Name: crc8_msb
* Description: CRC8 check to compare PEC data
* Parameters: poly - x8+x2+x1+1, data - array to check, array size
* Return: 0 – data right; 1 – data Error
****************************************************************/
uint8_t crc8Msb(uint8_t poly, uint8_t* data, int size) {
uint8_t crc = 0x00;
int bit;
while (size--)
{
crc ^= *data++;
for (bit = 0; bit < 8; bit++)
{
if (crc & 0x80) {
crc = (crc << 1) ^ poly;
} else {
crc <<= 1;
}
}
}
return crc;
}
/****************************************************************
* Function Name: Print_Temperature
* Description: receive and print out temperature in Celcius and fahrenheit
* Parameters: Temperature_kind - choose ambient or object Temperature
* Return:
****************************************************************/
void printTemperature(int Temperature_kind) {
int dev = DEVICE<<1;
int dataLow = 0;
int dataHigh = 0;
int pec = 0;
i2c_start(dev+I2C_WRITE);
i2c_write(Temperature_kind);
// read
i2c_rep_start(dev+I2C_READ);
dataLow = i2c_read(false);
dataHigh = i2c_read(false);
pec = i2c_read(true);
i2c_stop();
//This converts high and low bytes together and processes temperature, MSB is a error bit and is ignored for temps
double tempFactor = 0.02; // 0.02 degrees per LSB (measurement resolution of the MLX90614)
double tempData = 0x0000; // zero out the data
int frac; // data past the decimal point
// This masks off the error bit of the high byte, then moves it left 8 bits and adds the low byte.
tempData = (double)(((dataHigh & 0x007F) << 8) + dataLow);
tempData = (tempData * tempFactor)-0.01;
float celcius = tempData - 273.15;
float fahrenheit = (celcius*1.8) + 32;
//Serial.print("Celcius: ");
Serial.println(celcius);
//Serial.print("Fahrenheit: ");
//Serial.println(fahrenheit);
}
/****************************************************************
* Function Name: readEEPROM
* Description: read from eeprom to see what data in it.
* Parameters:
* Return:
****************************************************************/
int readEEPROM() {
int dev = DEVICE<<1;
int dataLow = 0;
int dataHigh = 0;
int pec = 0;
delay(500);
i2c_start(dev+I2C_WRITE);
i2c_write(AccessEEPROM);
// read
i2c_rep_start(dev+I2C_READ);
dataLow = i2c_read(false); //Read 1 byte and then send ack
dataHigh = i2c_read(false); //Read 1 byte and then send ack
pec = i2c_read(true);
i2c_stop();
uint16_t eepromData = 0x0000; // zero out the data
eepromData = (uint16_t)(((dataHigh & 0x007F) << 8) + dataLow);
Serial.print("eepromData: 0x");
Serial.println(eepromData, HEX);
return 0;
}
/****************************************************************
* Function Name: WriteEEPROM
* Description: write EEPROM at address 0x13 to adjust emissivity
* Parameters: emissivity – data to write into EEPROM
* Return: 0 - success; -1 - crc8 check err.
****************************************************************/
int writeEEPROM(uint16_t emissivity) {
char buffer[6] = {0};
char *write = buffer + 0;
char *cmd = buffer + 1;
char *data = buffer + 2;
int dev = 0x5B<<1;
*write = dev;
*cmd = AccessEEPROM;
*(data++) = emissivity & 0xff;
*(data++) = (emissivity >> 8) & 0xff;
*data = crc8Msb(0x07, (uint8_t*)buffer, 4);
Serial.println(*data, HEX);
if(crc8Msb(0x07,(uint8_t*)buffer, 5))
{
Serial.println("CRC8 Check Err...");
return -1;
}
Serial.println("CRC8 Check OK...");
i2c_start(dev+I2C_WRITE);
i2c_write(AccessEEPROM);
i2c_write( emissivity & 0xff );
i2c_write( (emissivity >> 8) & 0xff );
i2c_write(data[0]);
i2c_stop();
return 0;
}
};
#endif // __MLX90615_H__
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发表于 2019-7-16 21:36:45
楼主
