Ramin Sangesari
Published © GPL3+

Temperature Data Logger

Measures and records temperature with BBC Micro:bit.

EasyFull instructions provided1 hour171
Temperature Data Logger

Things used in this project

Hardware components

BBC micro:bit board
BBC micro:bit board
×1
ElecFreaks Micro:bit Breakout Board
×1
ElecFreaks Battery Holder With ON/OFF Switch and Cover for Micro:bit Board
×1
SparkFun OpenLog
SparkFun OpenLog
×1
SparkFun microSD Card
×1
ElecFreaks Real-time Clock
×1
ElecFreaks DS18B20 Digital Temperature
×1

Story

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Code

Temperature Data Logger

Arduino
#include <OneWire.h>
#include <Wire.h>    // I2C
#include "RTClib.h"  // RTC
#include <SoftwareSerial.h>
SoftwareSerial OpenLog(0, 8); 		// Serial DataLogger
RTC_DS1307 RTC;      				// RTC
#define TimeMin 5					// 5 Minute
#define DelayTime 60000*TimeMin
//OneWire DS18S20, DS18B20, DS1822 Temperature Example
OneWire ds(16);
void setup(void) 
{
 OpenLog.begin(9600);
 Wire.begin();
 RTC.begin();
 Serial.begin(9600);
 //RTC.adjust(DateTime(__DATE__, __TIME__));	//Adjust time 
}
void loop(void) 
{
 byte i;
 byte present = 0;
 byte type_s;
 byte data[12];
 byte addr[8];
 float celsius, fahrenheit;
 if ( !ds.search(addr)) 
 {
   ds.reset_search();
   delay(250);
   return;
 }
  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:
     type_s = 1;
     break;
   case 0x28:
     type_s = 0;
     break;
   case 0x22:
     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);
 present = ds.reset();
 ds.select(addr);    
 ds.write(0xBE);         // Read Scratchpad
 for ( i = 0; i < 9; i++) 
 {           
   data[i] = ds.read();
 }
 // Convert the data to actual temperature
 int16_t raw = (data[1] << 8) | data[0];
 if (type_s) {
   raw = raw << 3; // 9 bit resolution default
   if (data[7] == 0x10) 
   {
     raw = (raw & 0xFFF0) + 12 - data[6];
   }
 } 
 else 
 {
   byte cfg = (data[4] & 0x60);
   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
 }
 DateTime now = RTC.now();   // time 
 show_time_and_date(now);  // time
 celsius = (float)raw / 16.0;
 fahrenheit = celsius * 1.8 + 32.0;
 OpenLog.print(celsius);
 OpenLog.println();
 delay(DelayTime);
}
void show_time_and_date(DateTime datetime){
 // Year/Month/Day
 OpenLog.print(datetime.year(),DEC);
 OpenLog.print("/");
 if(datetime.month() < 10)
 {
	OpenLog.print(0);
 }
 OpenLog.print(datetime.month(),DEC);
 OpenLog.print("/");
 if(datetime.day() < 10)
 {
	OpenLog.print(0);
 }
 OpenLog.print(datetime.day(),DEC);
 OpenLog.print(",");
 // Hour:Minute:Second
 if(datetime.hour() < 10)
 {  
	OpenLog.print(0);
 }
 OpenLog.print(datetime.hour(),DEC);
 OpenLog.print(":");
 if(datetime.minute() < 10)
 {		
	OpenLog.print(0);
 }
 OpenLog.print(datetime.minute(),DEC);
 OpenLog.print(":");
 if(datetime.second() < 10)
 {	  
	OpenLog.print(0);
 }
 OpenLog.print(datetime.second(),DEC);
 OpenLog.print(",");
}

Temperature Data Logger.xlsx

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Credits

Ramin Sangesari

Ramin Sangesari

14 projects • 193 followers
Programmer and IoT Developer
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