What is it?
Most Digital clocks are made up of 4 7-segment display. A seven segment display is 7 leds arranged in specific manner that when some light up it forms a number ranging from 0-9 or letters from A-F.
What the machincal clock does is used servo motors as an led. so when you see the carboard cutout from top it replicates led_on and when looked from side looks like led_off.
Parts Needed
I used :
- Arduino Uno
- !6 bit channel Servo Controller.
- Carboard Cut hexagon shapes.
Math behind the Cardboard Cutouts.
I initially thought that cutting the hexagon cutouts was easy. In fact it was quite challenging. I had to find a perfect ratio.
- cut a rectangle with ratio 1:3 . I used 3:9 cm.
- draw a horizontal line across of length(1/2 of the short side ) from top and bottom of the long side. (Line T and B)
- Draw a verticle line from shor side to the other in the middle. ( center U and D)
- Connect U with edges Of T and D with B. then cutout thoses triangles to form a hexagon.
The code.
#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();
#define SERVOMIN 125 // this is the 'minimum' pulse length count (out of 4096)
#define SERVOMAX 575 // this is the 'maximum' pulse length count (out of 4096)
bool down=false;
uint8_t servonum = 0;
int ang[7];
void setup() {
Serial.begin(9600);
Serial.println("16 channel Servo test!");
pwm.begin();
pwm.setPWMFreq(60); // Analog servos run at ~60 Hz updates
setNum(1,8);
delay(1000);
}
void servo(int servoNum, int angleToMove){
pwm.setPWM(servoNum, 0, angleToPulse(angleToMove) );
}
void setNum(int digit, int numToSet){
if(digit==1){
switch(numToSet){
case 0:
if(!down){
down=true;
open();
servo(1,180);
close();
}
else{servo(1,180);}
servo(2,90);
servo(3,90);
servo(4,90);
servo(5,90);
servo(6,90);
servo(7,90);
break;
case 1:
if(!down){
down=true;
open();
servo(1,180);
close();
}
else{servo(1,180);}
servo(2,0);
servo(3,0);
servo(4,0);
servo(5,90);
servo(6,90);
servo(0,0);
break;
case 2:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,90);
servo(5,0);
servo(3,0);
servo(6,90);
break;
case 3:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,0);
servo(0,90);
servo(5,90);
servo(3,0);
servo(6,90);
break;
case 4:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,0);
servo(4,0);
servo(0,0);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,90);
break;
case 5:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,0);
servo(0,90);
servo(5,90);
servo(3,90);
servo(6,180);
break;
case 6:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,90);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,180);
break;
case 7:
if(!down){
down=true;
open();
servo(1,180);
close();
}
else{servo(1,180);}
servo(2,90);
servo(3,0);
servo(4,0);
servo(5,90);
servo(6,90);
servo(0,0);
break;
case 8:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,90);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,90);
break;
case 9:
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,00);
servo(0,90);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,90);
break;
case 10: //A
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,0);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,90);
break;
case 11: //B
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,0);
servo(4,90);
servo(0,90);
servo(5,90);
servo(1,90);
servo(3,90);
servo(6,180);
break;
case 12: //C
if(!down){
down=true;
open();
servo(1,180);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,90);
servo(5,0);
servo(3,90);
servo(6,180);
break;
case 13: //D
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,0);
servo(4,90);
servo(0,90);
servo(5,90);
servo(1,90);
servo(3,0);
servo(6,90);
break;
case 14: //e
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,90);
servo(5,0);
servo(1,90);
servo(3,90);
servo(6,180);
break;
case 15: //f
if(down){
down=false;
open();
servo(1,90);
close();
}
else{servo(1,90);}
servo(2,90);
servo(4,90);
servo(0,0);
servo(5,0);
servo(1,90);
servo(3,90);
servo(6,180);
break;
}
}
}
void open(){
servo(4, 45);
servo(5, 45);
delay(20);
}
void close(){
delay(30);
servo(4, 90);
servo(5, 90);
}
void loop() {
for( int i =0; i<16;i++){
setNum(1, i);
delay(1000);
}
}
int angleToPulse(int ang){
return map(ang,0, 180, SERVOMIN,SERVOMAX);
}I updated the code.
It has added funcionality for Letters A-F and Safer for a cutout to not overlap the other.
Until then goodbye!
Hriday's Blog 
Excellent work Hriday 👏 keep up the good work.
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Thank you so much
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Amazing …very good work Hriday … keep it up
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Thank you so much..
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