el_supremo:
Yes I am wiring correctly
That doesn't tell me much. Exactly which pin have you wired the data pin to?
I've also used the code in msg #1(OP) which uses pin 10, and the diagram in msg #2 (which uses pin 10). It works. Both sample sketches work, provided that the 18B20 is wired to the correct pin.
Either your wiring and/or your code are incorrect or you aren't using DS18B20 sensors.
Look at the flat surface of the sensors. Do the first two lines have this written on it?
DALLAS
18B20
Can you take a clear, focused photo of the way that you have the DS18B20 wired and attach it here?
Pete
I cannot confirm print on IC as it is a waterproof model and is located in a steel tube with heatshrink tubing, no writing on the outside.
I have tried everything I can think of and read of. Let me regale you. Here is the code I started with. It's included in the examples of the OneWire Library.
#include <OneWire.h>
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); // 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");
}
I have the VCC wire of sensor wired to breadboard rail wired to 5v on arduino (tried different ports on breadboard, confirmed 5.00v coming from arduino). I have ground wire of sensor wired to breadboard rail wired to ground of arduino (tested different ports on breadboard). I have a 4.7K ohm resistor wired from 5v rail wired to data wire of sensor. I have tested a 2.2K ohm and 10K ohm resistor with 5 different sensors. The data wire from breadboard is in digital pin 10 of my uno. I have attempted wiring to pin 2, 3, 4, 7, and 8 and changed accordingly in sketch:
OneWire ds(10); or OneWire ds(2); or OneWire ds(7); ... etc
I am not using parasite mode, changed code to:
ds.write(0x44);
I have tried running as parasite with VCC wire of sensor disconnected and code:
ds.write(0x44, 1);
I have tried every combination of trying different sensor, in parasite mode or not, different arduino pins, different resistors, different breadboard ports, and different codes. I have tried these codes as well to detect sensor and get ID:
#include <OneWire.h>
OneWire ds(3); // Connect your 1-wire device to pin 3
void setup(void) {
Serial.begin(9600);
discoverOneWireDevices();
}
void discoverOneWireDevices(void) {
byte i;
byte present = 0;
byte data[12];
byte addr[8];
Serial.print("Looking for 1-Wire devices...\n\r");
while(ds.search(addr)) {
Serial.print("\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");
return;
}
}
Serial.print("\n\r\n\rThat's it.\r\n");
ds.reset_search();
return;
}
void loop(void) {
// nothing to see here
}
Get this reported back:
Looking for 1-Wire devices...
That's it.
I can't thin of what to try next.