SparkFun Forums

[changks]

Hello:

I've purchased eight Temperature Sensor (SEN-11050). The power consumption is not listed on the product page. Could you please provide information for the following three questions?

(1) What is the power consumption for each sensor?
(2) I asume that they are low power consumption. Can they all wired together in order to use the 1-Wire Arduino library? Can they all share the one resistance and the 5V power output on board (Arduino YUN)?
(3) Can you take a look at my code? Any suggestions?

Thanks you so much.

Code: Select all

[code]#include <DallasTemperature.h>
#include <OneWire.h>

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include "RTClib.h"

OneWire oneWire(6); // pin D6
DallasTemperature sensors(&oneWire);
float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8;


// 1 min between grabbing data and logging it. 1000 ms (1 sec) * 60 = 60000 ms (60 sec)
#define LOG_INTERVAL  10000 // mills between entries
#define SYNC_INTERVAL 10000 // mills between calls to flush() - to write data to the card
uint32_t syncTime = 0; // time of last sync()

#define ECHO_TO_SERIAL   1 // echo data to serial port
#define WAIT_TO_START    0 // Wait for serial input in setup()

RTC_PCF8523 RTC; // define the Real Time Clock object

// digital pin 10 for the SD cs line for the data logging shield
const int chipSelect = 10;

// the logging file
File logfile;

void error(char *str)
{
  Serial.print("error: ");
  Serial.println(str);
  while(1);
}

void setup() {
  Serial.begin(115200);
  sensors.begin();

#if WAIT_TO_START
  Serial.println("Type any character to start");
  while (!Serial.available());
#endif //WAIT_TO_START

  // initialize the SD card - default chip D10 for SD datalogger shield
  pinMode(10, OUTPUT);

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
//    error("Card failed, or not present");
  }
  
  // create a new file
  char filename[] = "LOGGER00.CSV";
  for (uint8_t i = 0; i < 100; i++) {
    filename[6] = i/10 + '0';
    filename[7] = i%10 + '0';
    if (! SD.exists(filename)) {
      // only open a new file if it doesn't exist
      logfile = SD.open(filename, FILE_WRITE); 
      break;  // leave the loop!
    }
  }



  // connect to RTC
  Wire.begin();  
  if (!RTC.begin()) {
    logfile.println("RTC failed");
#if ECHO_TO_SERIAL
    Serial.println("RTC failed");
#endif  //ECHO_TO_SERIAL
  }  
}

void loop() {
  DateTime now;
  
  // delay for the amount of time we want between readings
  delay((LOG_INTERVAL -1) - (millis() % LOG_INTERVAL));

  // fetch the time
  now = RTC.now();
  logfile.print(now.year(), DEC);
  logfile.print("/");
  logfile.print(now.month(), DEC);
  logfile.print("/");
  logfile.print(now.day(), DEC);
  logfile.print(" ");
  logfile.print(now.hour(), DEC);
  logfile.print(":");
  logfile.print(now.minute(), DEC);
  logfile.print(":");
  logfile.print(now.second(), DEC);
#if ECHO_TO_SERIAL
  Serial.print(now.year(), DEC);
  Serial.print("/");
  Serial.print(now.month(), DEC);
  Serial.print("/");
  Serial.print(now.day(), DEC);
  Serial.print(" ");
  Serial.print(now.hour(), DEC);
  Serial.print(":");
  Serial.print(now.minute(), DEC);
  Serial.print(":");
  Serial.print(now.second(), DEC);
#endif //ECHO_TO_SERIAL  
  
  sensors.requestTemperatures();
  temp1 = sensors.getTempCByIndex(0); 
  temp2 = sensors.getTempCByIndex(1); 
  temp3 = sensors.getTempCByIndex(2); 
  temp4 = sensors.getTempCByIndex(3); 
  temp5 = sensors.getTempCByIndex(4); 
  temp6 = sensors.getTempCByIndex(5); 
  temp7 = sensors.getTempCByIndex(6); 
  temp8 = sensors.getTempCByIndex(7); 

  logfile.print(", ");
  logfile.print(temp1, 1); // top ST, one decimal place
  logfile.print(", ");
  logfile.print(temp2, 1); // bottom ST, one decimal place
  logfile.print(", ");
  logfile.print(temp3, 1); // 
  logfile.print(", ");
  logfile.print(temp4, 1); // 
  logfile.print(", ");
  logfile.print(temp5, 1); // 
  logfile.print(", ");
  logfile.print(temp6, 1); // 
  logfile.print(", ");
  logfile.print(temp7, 1); // 
  logfile.print(", ");
  logfile.println(temp8, 1); //

#if ECHO_TO_SERIAL
  Serial.print(", ");   
  Serial.print(temp1, 1); // top ST, one decimal place
  Serial.print(", ");
  Serial.print(temp2, 1); // bottom ST, one decimal place
  Serial.print(", ");
  Serial.print(temp3, 1); // 
  Serial.print(", ");
  Serial.print(temp4, 1); // 
  Serial.print(", ");
  Serial.print(temp5, 1); // 
  Serial.print(", ");
  Serial.print(temp6, 1); // 
  Serial.print(", ");
  Serial.print(temp7, 1); // 
  Serial.print(", ");
  Serial.println(temp8, 1); //      
#endif //ECHO_TO_SERIAL

  // write data to disk
  if ((millis() - syncTime) < SYNC_INTERVAL) return;
  syncTime = millis();
  logfile.flush();
}

[/code]

[Valen]

1 and 2: There is a datasheet under the documents tab of the product page with the info you need. I don't know which pull up resistor you are using, nor am I familiar with the capabilities of the YUN.

3: The IDE is going to complain about the [cod e] tag. Other than that, "if it ain broken, don't fix it!". Is it broken?