Jee Labs Talk

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1. joop
   

   jc,how can I switch backlight on / off ,by software ? , it's getting to hot!

   gr

   Posted 18/11/2009 17:36:59

2. joop
   

   I tried something , it switches it off ,and when a message to lcd
   is send it will be turned on by PortsLCD,my heatsink is now 0K.

   gr Joop

   ------------------------------------------------------------

   #include "PortsLCD.h"
   #include "RF12.h" // needed to avoid a linker error :(

   PortI2C myI2C (2);
   LiquidCrystalI2C lcd (myI2C);

   enum { MCPIODIR, MCPIPOL, MCPGPINTEN, MCPDEFVAL, MCPINTCON, MCPIOCON,
   

          MCPGPPU, MCPINTF, MCPINTCAP, MCPGPIO, MCPOLAT }; // value 0 - 10
   
   PortI2C myport (2/, PortI2C::KHZ400 /);
   
   DeviceI2C lcdbl (myport, 0x24);
   void setup()
   {
   
     Serial.begin(57600);
   
     Serial.println("Setup test");
   
     // set up the LCD's number of rows and columns:
   
     lcd.begin(20, 2);
   
     // Print a message to the LCD.
   
     lcd.print("Hello, world!");
   
   }
   void loop()
   
     {
   
       Serial.println("LCD test");
   
     // set the cursor to column 0, line 1
   
     // (note: line 1 is the second row, since counting begins with 0):
   
      lcd.setCursor(0, 1);
   
     // print the number of seconds since reset:
   
     lcd.print(millis()/1000);
   
     delay(1000);
   
     backlightoff();
   
     delay(1000);
   
   }
   void backlightoff(void)
   
   {
   
   lcdbl.send();
   
   lcdbl.write(MCPGPIO);
   
   lcdbl.write(0x7f);
   
   lcdbl.stop();
   
   }    
   ...

   Posted 18/11/2009 20:08:46

3. jcw
   

   Ah - nice solution!

   Posted 18/11/2009 20:58:58