Final Project repository for AESD course project - Aditya Pande

Check out this wiki for project overview and schedule.

Usage :

Morse Code Loopback usage :

For Raspberry Pi 3B+ model, this assumes the sending pin is GPIO12 and receiving pin is GPIO18

# To make without verbose printing
make CFLAGS=-DVERBOSE=false
# To make with verbose printing, default value of VERBOSE is true
make CFLAGS=-DVERBOSE=true

sudo ./morse-loopback "SOS--" 500.0 38000
# sudo ./morse-loopback text_to_send, clock_in_milliseconds, modulation_frequnecy_in_Hz

To run without modulation,

sudo ./morse-loopback "SOS--" 500.0;

Running receiver on other Raspberry Pi :

To receive data on the other device, the following command should be run on the other device before the sending begins :

sudo ./receiver 500.0
# sudo ./receiver clock_in_milliseconds

The clock_in_milliseconds value should match the one used while sending, and text to be sent should end with a -- to signify end of text.

File Transfer Loopback

For Raspberry Pi 4, use the following. This also assumed the sending pin is GPIO12 and the receiving pin is GPIO18

./file-transfer-app <file_path> <clock_in_milliseconds>

Example:

./file-transfer-app ./test.txt 5

Limitations :

The parameter clock_in_milliseconds gives reliable transmission only when set to a value of 20.0 (with modulation and IR LED-receiver setup) or above on Raspbeery Pi 3B+. On Raspberry Pi 4, reliable speeds have been seen at ~5ms