Arduino与Proteus仿真实例-DS18B20温度传感器驱动仿真

DS18B20温度传感器驱动仿真

DS18B20 是一种温度传感器，它提供 9 位到 12 位的温度读数。 … 该传感器的通信可以通过单线总线协议完成，该协议使用一条数据线与内部微处理器进行通信。

在前面的实例中，对DS18B20做了详细的介绍，请参考：

1、仿真电路原理图

2、仿真代码实现

// Interfacing Arduino with DS18B20 temperature sensor

#include <LiquidCrystal.h> // include LCD library code

#define DS18B20\_PIN 2



int raw_temp;
float temp;
char txt[] = " C ";

void setup(void) {
  // start serial port
  Serial.begin(9600);

}

void loop(void) {
  if(ds18b20\_read(&raw_temp)) {
    Serial.print("Temperature = ");
    temp = (float)raw_temp / 16;     // Convert temperature raw value into degree Celsius (temp in °C = raw/16)
    Serial.print(temp);              // Print temperature value in degree Celsius
    Serial.println("\*C");            // Print '°C'
  }
  else {
    Serial.println("Communication Error!");
  }
  delay(1000);
}

bool ds18b20\_start(){
  bool ret = 0;
  digitalWrite(DS18B20_PIN, LOW);     // Send reset pulse to the DS18B20 sensor
  pinMode(DS18B20_PIN, OUTPUT);
  delayMicroseconds(500);             // Wait 500 us
  pinMode(DS18B20_PIN, INPUT);
  delayMicroseconds(100);             //wait to read the DS18B20 sensor response
  if (!digitalRead(DS18B20_PIN)) {
    ret = 1;                          // DS18B20 sensor is present
    delayMicroseconds(400);           // Wait 400 us
  }
  return(ret);
}

void ds18b20\_write\_bit(bool value){
  digitalWrite(DS18B20_PIN, LOW);
  pinMode(DS18B20_PIN, OUTPUT);
  delayMicroseconds(2);
  digitalWrite(DS18B20_PIN, value);
  delayMicroseconds(80);
  pinMode(DS18B20_PIN, INPUT);
  delayMicroseconds(2);
}

void ds18b20\_write\_byte(byte value){
  byte i;
  for(i = 0; i < 8; i++)
    ds18b20\_write\_bit(bitRead(value, i));
}

bool ds18b20\_read\_bit(void) {
  bool value;
  digitalWrite(DS18B20_PIN, LOW);
  pinMode(DS18B20_PIN, OUTPUT);
  delayMicroseconds(2);
  pinMode(DS18B20_PIN, INPUT);
  delayMicroseconds(5);
  value = digitalRead(DS18B20_PIN);
  delayMicroseconds(100);
  return value;
}

byte ds18b20\_read\_byte(void) {
  byte i, value;
  for(i = 0; i  <8; i++)
    bitWrite(value, i, ds18b20\_read\_bit());
  return value;
}

bool ds18b20\_read(int \*raw_temp_value) {
  if (!ds18b20\_start())                     // Send start pulse
    return(0);                              // Return 0 if error
  ds18b20\_write\_byte(0xCC);                 // Send skip ROM command
  ds18b20\_write\_byte(0x44);                 // Send start conversion command
  while(ds18b20\_read\_byte() == 0);          // Wait for conversion complete
  if (!ds18b20\_start())                     // Send start pulse
    return(0);                              // Return 0 if error
  ds18b20\_write\_byte(0xCC);                 // Send skip ROM command
  ds18b20\_write\_byte(0xBE);                 // Send read command
  \*raw_temp_value = ds18b20\_read\_byte();    // Read temperature LSB byte and store it on raw\_temp\_value LSB byte
  \*raw_temp_value |= (unsigned int)(ds18b20\_read\_byte() << 8);     // Read temperature MSB byte and store it on raw\_temp\_value MSB byte
  return(1);                                // OK --> return 1
}