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LCD and AVR kit

Hello,

I am doing my own AVR kit. I connected LCD 8x2 on port A and B (RS - PA1; R/W - PB4; E - PA0; DB4-7 - PB0-3) . When LCD is not in the circuit nothing work like power supply is off. When LCD is in the circuit everything run. Connect and disconnect LCD is one of the important part of this kit.