Someone donated three flip flop to fixme, it would be good to make them work and display whatever we would like to.
Circuit board
Controller
8 bit micro Full datasheet : File:MC68HC705P6A-7151.pdf
T bridge
basically switch the power Full datasheet : File:DSA-60676.pdf
Manual driving
Principle
The stepper-motors can be driven directly by an Arduino powering the coils properly. The Arduino output is low-power so the motor needs to be driven in "high-torque" mode, ie. 2 coils at a time. That is to say, instead of having the magnetic field going N > E > S > W, it goes NE > SE > SW > NW.
To lower the electrical stress on the Arduino, it would be great to drive the motors with H-Bridges (or maybe T-bridge like in the original design).
Show me the code
The code is there (not pushed to any GIT):
// Roue des minutes :
// Engrenage moteur avec 4 aimants, capteur à effet Hall sur la PCB a la verticale
// Il faut compter 79 passages pour faire un tour de flaps. Vérifier s'il y a une dérive.
// Conclusion pour afficher le bon nombre : mapper 79*4 pas sur 62 positions (00->60 + blancs)
// Tempo du moteur pas à pas
#define tempo 14
#define SEC 10
#define MIN 6
#define HOR 2
unsigned int h = 0, m = 0, s = 0;
unsigned int hM = 0, mM = 0, sM = 0;
void setup() {
// Define outputs
for(int i=0; i<12; i++)
pinMode(i+1, OUTPUT);
Serial.begin(9600);
Serial.setTimeout(30*1000);
}
void rot(unsigned char hms, unsigned int target)
{
// Demande invalide
if((hms != SEC && hms != MIN && hms != HOR) || target > 60)
{
Serial.println("Incorrect !");
return;
}
// Flap 00 > 29 : numéros
// Flap 30 : blanc
// Flap 31 > 60 : numéros-1
// Flap 61 : blanc
// Position actuelle
unsigned int* current;
if(hms == SEC) current = &s;
else if(hms == MIN) current = &m;
else current = &h;
Serial.print("Position actuelle : ");
Serial.println(*current);
Serial.print("Target : ");
Serial.println(target);
// Action !
// On flip les flaps tant qu'on est pas arrivé à destination
Serial.print("Action sur les pins ");
Serial.print(hms+3);
Serial.print(", ");
Serial.print(hms+2);
Serial.print(", ");
Serial.print(hms+1);
Serial.print(", ");
Serial.println(hms);
while(*current != target)
{
Serial.print("Position actuelle : ");
int lol = *current;
Serial.println(lol);
for(int i = 0; i<4; i++)
{
// Step 5
digitalWrite(hms+3, LOW);
digitalWrite(hms+2, HIGH);
digitalWrite(hms+1, LOW);
digitalWrite(hms, HIGH);
delay(tempo);
// Step 7
digitalWrite(hms+3, HIGH);
digitalWrite(hms+2, LOW);
digitalWrite(hms+1, LOW);
digitalWrite(hms, HIGH);
delay(tempo);
// Step 1
digitalWrite(hms+3, HIGH);
digitalWrite(hms+2, LOW);
digitalWrite(hms+1, HIGH);
digitalWrite(hms, LOW);
delay(tempo);
// Step 3
digitalWrite(hms+3, LOW);
digitalWrite(hms+2, HIGH);
digitalWrite(hms+1, HIGH);
digitalWrite(hms, LOW);
delay(tempo);
}
// Demi-step pour faire tomber le flap, mais pas 2
digitalWrite(hms+3, LOW);
digitalWrite(hms+2, HIGH);
digitalWrite(hms+1, LOW);
digitalWrite(hms, LOW);
delay(tempo*2);
(*current)++;
if(*current >= 61)
*current = 0;
}
// Stop motor
digitalWrite(hms+3, LOW);
digitalWrite(hms+2, LOW);
digitalWrite(hms+1, LOW);
digitalWrite(hms, LOW);
Serial.println("Done");
}
void loop() {
if (Serial.available() > 0) {
unsigned char b = Serial.read();
if(b == 'h' || b == 'm' || b == 's')
{
int roue;
if(b == 'h') roue = HOR;
else if(b = 'm') roue = MIN;
else roue = SEC;
Serial.print("Roue selectionnee : ");
Serial.println(roue);
int nb = Serial.parseInt();
Serial.println(nb);
rot(roue,nb);
}
else if(b == 'w')
{
Serial.println("Give me 3 values !");
h = Serial.parseInt();
m = Serial.parseInt();
s = Serial.parseInt();
}
else if(b == '+')
{
rot(MIN,m+1);
}
}
}