LM317T Voltage Regulator with Pass Transistor

Digital thermometer using the PIC18f4520 micro controller and a DS1631 digital thermometer chip. This is all connected to an LCD screen to update the temperature of the room once a second. The connection between the chip and micro controller is I2C. I put my finger on top of the digital thermometer chip, to increase the temperature. I was using a voltage regulator to power my LCD ( from 5 to 3.3) and this is why the LCD back light flickers.



http://www.youtube.com/watch?v=EZ1v66NVNn8&hl=en