Difference between revisions of "Split-flap display"

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Someone donated three flip flop to fixme, it would be good to make them work and display whatever we would like to.
 
Someone donated three flip flop to fixme, it would be good to make them work and display whatever we would like to.
−
The circuit board use the MC68HC705P6A-7151 controller.
+
 
−
Full datasheet : [[File:MC68HC705P6A-7151.pdfMC68HC705P6A-7151]]
+
== 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):
 +
 
 +
<code>  // 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);
 +
      }
 +
    }
 +
  }
 +
 
 +
</code>

Latest revision as of 01:37, 23 November 2013

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);
     }
   }
 }

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