Password protected system with AVR using DTMF

Password protected system using DTMF

Hello guys, this project is about password protected system using DTMF module. By using a predefined number we can make output either high or low by using the three digit code.
The codes can be changed in the program.

Components required:

• Atmega 16A
• USBasp programmer
• AVRdudes (for burning hex file)
• AVRStudio 4
• Compiler used: GCC
• DTMF module
• 3.5 mm audio jack

FOR OUTPUT LOW CODE IS str1="248"

FOR OUTPUT HIGH CODE IS str2="842"

Connections are as follows:

Q0-PD0

Q1-PD1

Q2-PD2

Q3-PD3

Output is from: PB0.

Check out the diagram:

Click here to download

Hope you had enjoyed the tutorial.

Stay tuned for more updates