Extreme Software Engineering: https://www.youtube.com/watch?v=tMJW7p0EX7k

arduino_sketch.ino

void setup() {
  Serial.begin(9600);
  pinMode(7, OUTPUT);
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:

 if (Serial.available() > 0) {

    char currentIMStatusCode = Serial.read();
    Serial.println(currentIMStatusCode);
   digitalWrite(7, HIGH);
    delay(1000);
    digitalWrite(7, LOW);
  } 
 }

critical.txt

 ██████╗██████╗ ██╗████████╗██╗ ██████╗ █████╗ ██╗
██╔════╝██╔══██╗██║╚══██╔══╝██║██╔════╝██╔══██╗██║
██║     ██████╔╝██║   ██║   ██║██║     ███████║██║
██║     ██╔══██╗██║   ██║   ██║██║     ██╔══██║██║
╚██████╗██║  ██║██║   ██║   ██║╚██████╗██║  ██║███████╗
 ╚═════╝╚═╝  ╚═╝╚═╝   ╚═╝   ╚═╝ ╚═════╝╚═╝  ╚═╝╚══════╝

███████╗██╗   ██╗███╗   ██╗████████╗ █████╗ ██╗  ██╗
██╔════╝╚██╗ ██╔╝████╗  ██║╚══██╔══╝██╔══██╗╚██╗██╔╝
███████╗ ╚████╔╝ ██╔██╗ ██║   ██║   ███████║ ╚███╔╝
╚════██║  ╚██╔╝  ██║╚██╗██║   ██║   ██╔══██║ ██╔██╗
███████║   ██║   ██║ ╚████║   ██║   ██║  ██║██╔╝ ██╗
╚══════╝   ╚═╝   ╚═╝  ╚═══╝   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝

███████╗██████╗ ██████╗  ██████╗ ██████╗
██╔════╝██╔══██╗██╔══██╗██╔═══██╗██╔══██╗
█████╗  ██████╔╝██████╔╝██║   ██║██████╔╝
██╔══╝  ██╔══██╗██╔══██╗██║   ██║██╔══██╗
███████╗██║  ██║██║  ██║╚██████╔╝██║  ██║
╚══════╝╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝ ╚═╝  ╚═╝

main.c

#include <stdio.h>

int main() {
	printf("Hello world!");
	return 0;
}

melt.sh

#!/bin/sh


# Colors and Fonts #
OF="\e[m"
RD="\e[31m"
GN="\e[32m"
YL="\e[33m"
BL="\e[34m"

BLINK="\e[5m"

B="\e[01m" # bold
U="\e[04m" # underscore
I="\e[07m" # invert colors

OFF="\e[m"

#SERIAL=/dev/null
SERIAL=/dev/ttyACM0

compile() {
	printf "$B$GN"
	echo "cc    main.c    -o main"
	echo "Compiling..."
	printf "\a"
	printf "$OFF"
	echo
	sleep 2
}

input() {
	echo -n "$ "
	read INPUT
}

critical() {
	sleep 3
	printf "$B$RD$BLINK"
	cat critical.txt

	for delay in 1 0.8 0.6 0.4 0.2 0.2 0.1 0.1 0.1 0.1; do
		printf "\a"
		sleep $delay
	done
	printf "$OFF"

	for i in `seq 10000`; do
		printf "\a"
		sleep 0.05
		echo >$SERIAL
	done
}

clear

# Phase 1
input
vi main.c
input
compile
#echo "$ ./main"
input
sleep 1
echo "Hello world!"

# Phase 2
input
vi main.c
input
compile

critical