Hi. I am using a DS18B20 temp sensor and having trouble trying to figure out the code to print the value to the screen. I found a code that allows you to exclude the need for the pullup resister and uses the one built into the chip.
#include <OneWire.h>
#include <DallasTemperature.h>
// This is an updated version of the Tester program that comes with the DallasTemp library
// It will drive a DS18x20 tempurature sensor plugged directly to the Arduino header pins 8,9, and 10.
// The flat side of the sensor should face into the center of the board.
// More info and a video here...
// http://wp.josh.com/2014/06/23/no-external-pull-up-needed-for-ds18b20-temp-sensor/#more-1892
// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 9
#define TEMPERATURE_PRECISION 9
// Uncomment this line if you are using the updated dallas_temp_library that
// supports the busFail() method to diagnose bus problems
// #define BUSFAIL
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
void setup(void)
{
// This lines just make it so you can plug a DS18B20 directly into
// digitial pins 8-10.
digitalWrite( 8 , LOW );
pinMode( 8 , OUTPUT );
digitalWrite( 10 , LOW );
pinMode( 10 , OUTPUT );
// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature IC Control Library Demo");
}
void loop(void)
{
#ifdef BUSFAIL
Serial.print(" Test:");
if (sensors.reset()) {
Serial.print("good");
} else {
if (sensors.busFail()) {
Serial.print("fail");
} else {
Serial.print("empty");
}
}
#endif
int numberOfDevices; // Number of temperature devices found
DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address
// For testing purposes, reset the bus every loop so we can see if any devices appear or fall off
sensors.begin();
// Grab a count of devices on the wire
numberOfDevices = sensors.getDeviceCount();
Serial.print(" Parasite:");
if (sensors.isParasitePowerMode()) Serial.print("ON ");
else Serial.print("OFF ");
Serial.print("Count:");
Serial.print(numberOfDevices, DEC);
// report parasite power requirements
sensors.requestTemperatures(); // Send the command to get temperatures
// Loop through each device, print out temperature data
for(int i=0;i<numberOfDevices; i++)
{
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i))
{
// Output the device ID
Serial.print(" #");
Serial.print(i,DEC);
Serial.print("=");
float tempC = sensors.getTempC(tempDeviceAddress);
Serial.print(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
}
//else ghost device! Check your power requirements and cabling
}
Serial.println("");
delay(1000);
}
// function to print a device address
void printAddress(DeviceAddress deviceAddress)
{
for (uint8_t i = 0; i < 8; i++)
{
if (deviceAddress[i] < 16) Serial.print("0");
Serial.print(deviceAddress[i], HEX);
}
}
I have incorporated this into my very long sketch (5500 lines and too big to paste on here) but as a basic, how can I print this to my screen? The serial print works fine, just need it to screen. I want the temperature reading to replace the below line of code which was entered as a temporary measure to setup my spacings during design phase.
myGLCD.print("72.6",18,53); // TEMPORARY VALUES
Any help appreciated. Thanks.
PS. I'd also like the ' ° ' added to the end of thats possible rather than just add a new 'myGLCD.print' part if you know what I mean?
Thanks
