G'Day Gang,
I seem to be having trouble finding the addresses of 2 DS18B20 temp probes. I have them set up on a bread board with a 4.7k pull up
resister.
I am using this sketch.
/* YourDuino Example: Find Address of a DS18B20 Temperature Sensor
Cut and paste the address to a text file for later use.
V1.1 01/17/2013
Questions: terry@yourduino.com
Connections:
DS18B20 Pinout (Left to Right, pins down, flat side toward you)
- Left = Ground
- Center = Signal (Pin 2): (with 3.3K to 4.7K resistor to +5 or 3.3 )
- Right = +5 or +3.3 V
This sketch looks for 1-wire devices and prints their addresses (serial number)
to the Serial Monitor in a format that is useful in Arduino sketches.
Based on example at:
http://www.hacktronics.com/Tutorials/arduino-1-wire-address-finder.html
*/
/*-----( Import needed libraries )-----*/
#include <OneWire.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define SENSOR_PIN 2 // Any pin 2 to 12 (not 13) and A0 to A5
/*-----( Declare objects )-----*/
OneWire ourBus(SENSOR_PIN); // Create a 1-wire object
void setup() /****** SETUP: RUNS ONCE ******/
{
Serial.begin(9600);
discoverOneWireDevices(); // Everything happens here!
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
// Nothing happening here
}
/*-----( Declare User-written Functions )-----*/
void discoverOneWireDevices(void) {
byte i;
byte present = 0;
byte data[12];
byte addr[8];
Serial.print("Looking for 1-Wire devices...\n\r");// "\n\r" is NewLine
while(ourBus.search(addr)) {
Serial.print("\n\r\n\rFound \'1-Wire\' device with address:\n\r");
for( i = 0; i < 8; i++) {
Serial.print("0x");
if (addr[i] < 16) {
Serial.print('0');
}
Serial.print(addr[i], HEX);
if (i < 7) {
Serial.print(", ");
}
}
if ( OneWire::crc8( addr, 7) != addr[7]) {
Serial.print("CRC is not valid!\n\r");
return;
}
}
Serial.println();
Serial.print("Done");
ourBus.reset_search();
return;
}
//*********( THE END )***********
The sketch compiles ok and uploads fine.
When I open the serial monitor I get
"Looking for 1-Wire devices...
Done"
and no device addresses.
I have checked and rechecked pin numbers and connections but still no joy.
Any ideas pls
Cheers
Dennis
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