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f82212057

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Posts posted by f82212057

  1. #include <OneWire.h>
    
    // OneWire DS18S20, DS18B20, DS1822 Temperature Example
    //
    // http://www.pjrc.com/teensy/td_libs_OneWire.html
    //
    // The DallasTemperature library can do all this work for you!
    // http://milesburton.com/Dallas_Temperature_Control_Library
    
    OneWire  ds(10);  // on pin 10 (a 4.7K resistor is necessary)
    
    void setup(void) {
      Serial.begin(9600);
    }
    
    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");
    }

    This is the code I used, I correct my sensor to 3V3 voltage , but it still not working.

    Another way if I use the wrong voltage would it damage my launchpad?

  2. Hello,

    I'm try to use msp-exp430g2553et launchpad with energia

    but the serial monitor doesn't work.

    I'm using the example code:(One Wire DS18X20_temperature)

    I found it need to change RXD TXD but I changed it display "no more addresses"

    please help, thanks!

    IMG_2133.thumb.JPG.429c5667158ac001ab1b8a63e1b47b5b.JPG

    image.thumb.png.b50beda621c167b5bd8d0b06ea0c382d.png

    IMG_2134.thumb.JPG.1c89dba2e1aca1c30b03d90f5dacd7fc.JPG

    image.thumb.png.5de92b622245268047a488f14de66522.png

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