Hey people. I have been working on a system for my science fair that can detect whether a seat belt is fastened. In my prototype the "seat belt" is actually a switch. Fastened = closed, Unfastened = open. The system is made up of two components, a seat belt status checker and a "car". The seat belt status checker lights up a green LED when the switch is closed, and a red one if the switch is open. It is controlled by a 7404 IC. The "car" is a simple LED circuit that should light up only if the seat belt is fastened. Overall the system works like this:
"Seat belt" fastened ---> Button on "car" pressed ---> green LED on "car" turns on ---> "Seat belt" unfastened ---> green LED on "car" blinks for 10sec/7seg LED countdowns 10sec ---> green LED on "car" turns off ---> Back to Step 1
I have programmed the 7 seg LED already but cannot seem to link the "seat belt status checker" to the "car". Any ideas on how to program it so? My current progress on the program:
#define A 2
#define B 3
#define C 4
#define D 5
#define E 6
#define Z 7
#define G 8
#define ledPin 10
const int sbeltState = 0;
const int sbeltPin = 9;
#define ON HIGH
#define OFF LOW
int ms = 1000;
void setup(){
pinMode(A, OUTPUT);
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(Z, OUTPUT);
pinMode(G, OUTPUT);
}
void loop(){
sbeltState == digitalRead(sbeltPin);
while (sbeltState == HIGH){
countdown();
}
}
void countdown(){
nine();
delay(ms);
eight();
delay(ms);
seven();
delay(ms);
six();
delay(ms);
five();
delay(ms);
four();
delay(ms);
three();
delay(ms);
two();
delay(ms);
one();
delay(ms);
zero();
delay(ms);
}
void nine(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, OFF);
digitalWrite(Z, ON);
digitalWrite(G, ON);
}
void eight(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, ON);
digitalWrite(Z, ON);
digitalWrite(G, ON);
}
void seven(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, OFF);
digitalWrite(E, OFF);
digitalWrite(Z, OFF);
digitalWrite(G, OFF);
}
void six(){
digitalWrite(A, ON);
digitalWrite(B, OFF);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, ON);
digitalWrite(Z, ON);
digitalWrite(G, ON);
}
void five(){
digitalWrite(A, ON);
digitalWrite(B, OFF);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, OFF);
digitalWrite(Z, ON);
digitalWrite(G, ON);
}
void four(){
digitalWrite(A, OFF);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, OFF);
digitalWrite(E, OFF);
digitalWrite(Z, ON);
digitalWrite(G, ON);
}
void three(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, OFF);
digitalWrite(Z, OFF);
digitalWrite(G, ON);
}
void two(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, OFF);
digitalWrite(D, ON);
digitalWrite(E, ON);
digitalWrite(Z, OFF);
digitalWrite(G, ON);
}
void one(){
digitalWrite(A, OFF);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, OFF);
digitalWrite(E, OFF);
digitalWrite(Z, OFF);
digitalWrite(G, OFF);
}
void zero(){
digitalWrite(A, ON);
digitalWrite(B, ON);
digitalWrite(C, ON);
digitalWrite(D, ON);
digitalWrite(E, ON);
digitalWrite(Z, ON);
digitalWrite(G, OFF);
}
My Setup