1. Here is the circuit diagram.
2. Here are all the parts we need.
3. Some screenshot of the making steps
4. Test it.
List of electronics component below:
Resistor:
Resistor 100K ohm x2 http://bit.ly/2WmR1ud
Resistor 2.2K ohm http://bit.ly/2AJVU8g
Resistor 10K ohm x2 http://bit.ly/2TMSWXV
Resistor 7.5K http://bit.ly/2Xry0Ha
Resistor 5.1K http://bit.ly/2M9Ua0l
Resistor 1K ohm http://bit.ly/2XXF9R3
0.33R/5W resistor X2 https://ebay.to/32cTZFk
Capacitor:
Capacior 100nF x4 http://bit.ly/2QK6ph7
Capacitor 47uF/50V http://bit.ly/2XpZCkV
Capacitor 100uF/25V http://bit.ly/2RMTpMi
Diode:
1N4007 http://bit.ly/2tt5dFO
Female Header http://bit.ly/2RU8f3T
Male Header http://bit.ly/2TOw5Lv
Power Cos http://bit.ly/2IrYcfF
LCD 16x2 http://bit.ly/2Jeb3ng
LM7805 http://bit.ly/2NAK9tN
Atmega 8 http://bit.ly/2XsqOj8
More details, you can check it on Youtube: