SODAQ
Connect Anything Anywhere
7. Using the OLED Screen to display a temperature
In this tutorial you will learn how to print data onto an OLED Screen, and how to read values from a digital thermometer.
First download the following zip file:
http://www.seeedstudio.com/wiki/File:LCD_Display9696_Library.zip
Unzip it into the libraries file in the Arduino folder that is found in my documents after the application is installed:
Required components:
SODAQ Moja
0.5W Solar Panel
1aH battery pack
Grove - Temperature Sensor
Grove - OLED 0.96"x0.96" Display
2x Grove w/o Buckle Cable (any length)
Plug the displayinto the SDA SCL pin in the always on (not switched) row.
Next, place the grove temperature sensor into the A0 A1 in the always on row. Plug the 0.5W solar panel and the 1A LiPo battery into the respective sockets (see http://www.sodaq.net/#!getting-started/c21ma for a board diagram)
Turn on the SODAQ board, compile and upload the following sketch from the arduino IDE onto the SODAQ Board, and then unplug the USB cable from the computer when it is working:
#include <wire.h>
#include <SeeedGrayOLED.h>
#include <avr/pgmspace.h>
#include <math.h>
int a;
float temperature;
int B=3975; //B value of the thermistor
float resistance;
void setup()
{
Wire.begin();
SeeedGrayOled.init(); //initialize SEEED OLED display
SeeedGrayOled.clearDisplay(); //Clear Display.
SeeedGrayOled.setNormalDisplay();
//Set Normal Display Mode
SeeedGrayOled.setVerticalMode();
//Set addressing mode to Page Mode
for(char i=0; i < 12 ; i++);
}
void loop()
{
SeeedGrayOled.setTextXY(0,0);
//Set the cursor to Xth Page, Yth Column
SeeedGrayOled.putString("Temp (oC):");
//Print the String
SeeedGrayOled.putNumber(temperature);
a=analogRead(0);
resistance=(float)(1023-a)*10000/a;
//get the resistance of the sensor
temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;
//convert to temperature via datasheet
delay(1000);
}