LCD PCB and the Photodiode ( Light Sensor )

LCD board:

This was giving to each pupil in the lab after signing the agreement paper. One has to reflect first before putting components on this board, because there is only a single board for each pupil. Therefore, making a mistake here is like a none returning point. caution is necessary when soldering this LCD board.

LDD(Light Dependant Diode)/ Photodiode ( Light Sensor ):

The Photodiode below in the picture is the one I used on the Sensor/Control PCB in order to measure the level of light ( in Lux). It was quite hard to identify which side is the cathode and the anode. By doing a little research I found out that the white bar line ( which can be seen in the picture below ) is the cathode ( Negative ). knowing this at the start of soldering the components into the Sensor/Control board was the most essential thing to me.