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January 11, 2019 05:05
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Arduino Uno interface with DS18B20
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/*********************************************************************** | |
* Project : Arduino_UNO_DS1820 | |
* Description : อ่านค่าและแสดงผลเซนเซอร์วัดอุณหภูมิ DS1820 | |
* Author : Tenergy Innovation Co., Ltd. | |
* Date : 14 Nov 2018 | |
* Revision : 1.0 | |
* Rev1.0 : Original | |
* website : http://www.tenergyinnovation.co.th | |
* Facebook : https://www.facebook.com/tenergy.innovation | |
* Email : uten.boonliam@innovation.co.th | |
* TEL : 089-140-7205 | |
***********************************************************************/ | |
/**************************************/ | |
/* include library */ | |
/**************************************/ | |
#include <OneWire.h> | |
/**************************************/ | |
/* GPIO define */ | |
/**************************************/ | |
#define ONE_WIRE_BUS 4 // DS18B20 on arduino pin2 corresponds to D4 on physical board | |
/**************************************/ | |
/* object define */ | |
/**************************************/ | |
OneWire ds(ONE_WIRE_BUS); // on pin 10 (a 4.7K resistor is necessary) | |
/*********************************************************************** | |
* FUNCTION: setup | |
* DESCRIPTION: setup process | |
* PARAMETERS: nothing | |
* RETURNED: nothing | |
***********************************************************************/ | |
void setup() { | |
// put your setup code here, to run once: | |
Serial.begin(9600); | |
Serial.println("************************************************"); | |
Serial.println("Project : Arduino_UNO_ds1820"); | |
Serial.println("Author : Tenergy Innovation Co., Ltd."); | |
Serial.println("Date : 14 Nov 2018"); | |
Serial.println("website : http://www.tenergyinnovation.co.th"); | |
Serial.println("Email : uten.boonliam@innovation.co.th"); | |
Serial.println("TEL : 089-140-7205"); | |
Serial.println("************************************************"); | |
} | |
/*********************************************************************** | |
* FUNCTION: loop | |
* DESCRIPTION: loop process | |
* PARAMETERS: nothing | |
* RETURNED: nothing | |
***********************************************************************/ | |
void loop(void) { | |
byte i; | |
byte present = 0; | |
byte type_s; | |
byte data[12]; | |
byte addr[8]; | |
float celsius, fahrenheit; | |
if ( !ds.search(addr)) { | |
Serial.println("No more addresses."); | |
Serial.println(); | |
ds.reset_search(); | |
delay(250); | |
return; | |
} | |
Serial.print("ROM ="); | |
for( i = 0; i < 8; i++) { | |
Serial.write(' '); | |
Serial.print(addr[i], HEX); | |
} | |
if (OneWire::crc8(addr, 7) != addr[7]) { | |
Serial.println("CRC is not valid!"); | |
return; | |
} | |
Serial.println(); | |
// the first ROM byte indicates which chip | |
switch (addr[0]) { | |
case 0x10: | |
Serial.println("Chip = DS18S20"); // or old DS1820 | |
type_s = 1; | |
break; | |
case 0x28: | |
Serial.println("Chip = DS18B20"); | |
type_s = 0; | |
break; | |
case 0x22: | |
Serial.println("Chip = DS1822"); | |
type_s = 0; | |
break; | |
default: | |
Serial.println("Device is not a DS18x20 family device."); | |
return; | |
} | |
ds.reset(); | |
ds.select(addr); | |
ds.write(0x44, 1); // start conversion, with parasite power on at the end | |
delay(1000); // maybe 750ms is enough, maybe not | |
// we might do a ds.depower() here, but the reset will take care of it. | |
present = ds.reset(); | |
ds.select(addr); | |
ds.write(0xBE); // Read Scratchpad | |
Serial.print("Data = "); | |
Serial.print(present, HEX); | |
Serial.print(" "); | |
for ( i = 0; i < 9; i++) { // we need 9 bytes | |
data[i] = ds.read(); | |
Serial.print(data[i], HEX); | |
Serial.print(" "); | |
} | |
Serial.print(" CRC="); | |
Serial.print(OneWire::crc8(data, 8), HEX); | |
Serial.println(); | |
// Convert the data to actual temperature | |
// because the result is a 16 bit signed integer, it should | |
// be stored to an "int16_t" type, which is always 16 bits | |
// even when compiled on a 32 bit processor. | |
int16_t raw = (data[1] << 8) | data[0]; | |
if (type_s) { | |
raw = raw << 3; // 9 bit resolution default | |
if (data[7] == 0x10) { | |
// "count remain" gives full 12 bit resolution | |
raw = (raw & 0xFFF0) + 12 - data[6]; | |
} | |
} else { | |
byte cfg = (data[4] & 0x60); | |
// at lower res, the low bits are undefined, so let's zero them | |
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms | |
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms | |
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms | |
//// default is 12 bit resolution, 750 ms conversion time | |
} | |
celsius = (float)raw / 16.0; | |
fahrenheit = celsius * 1.8 + 32.0; | |
Serial.print("Temperature = "); | |
Serial.print(celsius); | |
Serial.print(" Celsius, "); | |
Serial.print(fahrenheit); | |
Serial.println(" Fahrenheit"); | |
Serial.println("-----------------------------------"); | |
} |
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