Legg: Created page with "==Synopsis== Use an oscilloscope in XY mode to display time. Uses two MCP4725 and a DS1302. ==Notes== Known bug. 12 hour hand is missing. Hour hand does not creep, but inst..."

2020-12-08T19:01:39Z

Created page with "==Synopsis== Use an oscilloscope in XY mode to display time. Uses two MCP4725 and a DS1302. ==Notes== Known bug. 12 hour hand is missing. Hour hand does not creep, but inst..."

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==Synopsis==
Use an oscilloscope in XY mode to display time. Uses two MCP4725 and a DS1302.
==Notes==
Known bug. 12 hour hand is missing. Hour hand does not creep, but instead moves in one hour notches. Ideally, use the Sine function to determine precise positioning.
==Code==
<syntaxhighlight lang="C++" line='line'>
//Arduino UNO
//Pin 5 : DS1302 Chip Enable
//Pin 6 : DS1302 Data
//Pin 7 : DS1302 Data Clock
//Pin A4 : MCP4725 SDA pins
//Pin A5 : MCP4725 SCK pins
//
//5 Volt pin powers all external devices
//Please verify that your modules are also
//compatible with a 5 volt supply.
//
//On the MCP4725 devices, attach one A0
//pin to 5 volts and the other to ground
//to ensure these are on different addresses
//The SDA and SCK pins on these can be attached
//to each other. The device ID of the
//MCP4725 had to be discovered experimentally
//and you may need to discover those values as
//well.
//
//On the MCP4725, choose the voltage out pins
//to be connected to the X and Y inputs of
//your oscilloscope such that the clock is suitably rotated.

#include <Wire.h>
#include <Adafruit_MCP4725.h>
#include <DS1302.h>

//Begin DS1302 Configuration
const int kCePin = 5; // Chip Enable
const int kIoPin = 6; // Input/Output
const int kSclkPin = 7; // Serial Clock
DS1302 rtc(kCePin, kIoPin, kSclkPin);
//End DS1302 Configuration

// Begin MCP4725 Configuration
Adafruit_MCP4725 dac_X;
Adafruit_MCP4725 dac_Y;
// End MCP4725 Configuration

//timing and counnters
long us;
bool toggle;
byte t=0;

const uint16_t DACLookup_FullSine_8Bit[256] =
{
2048, 2098, 2148, 2198, 2248, 2298, 2348, 2398,
2447, 2496, 2545, 2594, 2642, 2690, 2737, 2784,
2831, 2877, 2923, 2968, 3013, 3057, 3100, 3143,
3185, 3226, 3267, 3307, 3346, 3385, 3423, 3459,
3495, 3530, 3565, 3598, 3630, 3662, 3692, 3722,
3750, 3777, 3804, 3829, 3853, 3876, 3898, 3919,
3939, 3958, 3975, 3992, 4007, 4021, 4034, 4045,
4056, 4065, 4073, 4080, 4085, 4089, 4093, 4094,
4095, 4094, 4093, 4089, 4085, 4080, 4073, 4065,
4056, 4045, 4034, 4021, 4007, 3992, 3975, 3958,
3939, 3919, 3898, 3876, 3853, 3829, 3804, 3777,
3750, 3722, 3692, 3662, 3630, 3598, 3565, 3530,
3495, 3459, 3423, 3385, 3346, 3307, 3267, 3226,
3185, 3143, 3100, 3057, 3013, 2968, 2923, 2877,
2831, 2784, 2737, 2690, 2642, 2594, 2545, 2496,
2447, 2398, 2348, 2298, 2248, 2198, 2148, 2098,
2048, 1997, 1947, 1897, 1847, 1797, 1747, 1697,
1648, 1599, 1550, 1501, 1453, 1405, 1358, 1311,
1264, 1218, 1172, 1127, 1082, 1038, 995, 952,
910, 869, 828, 788, 749, 710, 672, 636,
600, 565, 530, 497, 465, 433, 403, 373,
345, 318, 291, 266, 242, 219, 197, 176,
156, 137, 120, 103, 88, 74, 61, 50,
39, 30, 22, 15, 10, 6, 2, 1,
0, 1, 2, 6, 10, 15, 22, 30,
39, 50, 61, 74, 88, 103, 120, 137,
156, 176, 197, 219, 242, 266, 291, 318,
345, 373, 403, 433, 465, 497, 530, 565,
600, 636, 672, 710, 749, 788, 828, 869,
910, 952, 995, 1038, 1082, 1127, 1172, 1218,
1264, 1311, 1358, 1405, 1453, 1501, 1550, 1599,
1648, 1697, 1747, 1797, 1847, 1897, 1947, 1997
};

const long HandsX[60] =
{
2047, 2261, 2473, 2680, 2880, 3071, 3251, 3417,
3569, 3704, 3820, 3918, 3994, 4050, 4083, 4095,
4083, 4050, 3994, 3918, 3820, 3704, 3569, 3417,
3251, 3071, 2880, 2680, 2473, 2261, 2048, 1834,
1622, 1415, 1215, 1024, 844, 678, 526, 391,
275, 177, 101, 45, 12, 1, 12, 45,
101, 177, 275, 391, 526, 678, 844, 1024,
1215, 1415, 1622, 1834
};
const long HandsY[60] =
{
4095, 4083, 4050, 3994, 3918, 3820, 3704, 3569,
3417, 3251, 3071, 2880, 2680, 2473, 2261, 2048,
1834, 1622, 1415, 1215, 1024, 844, 678, 526,
391, 275, 177, 101, 45, 12, 1, 12,
45, 101, 177, 275, 391, 526, 678, 844,
1024, 1215, 1415, 1622, 1834, 2047, 2261, 2473,
2680, 2880, 3071, 3251, 3417, 3569, 3704, 3820,
3918, 3994, 4050, 4083
};

void Hand(byte v, byte len)
{
long i,x,y;
for(i=0;i<len;i++)
//Draw from center
{
//2048,2048 is the center.
x=2048+(HandsX[v]-2048)*i/100;
y=2048+(HandsY[v]-2048)*i/100;
dac_X.setVoltage(x , false,400000);
dac_Y.setVoltage(y , false,400000);
}
}

void Circle()
{
uint16_t i;
uint16_t j;
for (i = 0; i < 256; i++)
{
dac_X.setVoltage(DACLookup_FullSine_8Bit[i], false);

j=i+193;
j=j%256;
dac_Y.setVoltage(DACLookup_FullSine_8Bit[j], false);

}
}

void setup(void) {
Serial.begin(9600);
delay(1000);
rtc.writeProtect(true);
Serial.println("This page intentionally left blank.");

dac_X.begin(0x63);
dac_Y.begin(0x62);
us = 500000 + micros();
}

void loop(void)
{
byte hr;
Time tm;
tm = rtc.time();
hr=tm.hr;
while(hr>12) hr -= 12;

if(t==0)
{
//Update time from rtc

t=1;
}

if(micros()<us)
{
Circle();
Hand(tm.min,70); //Minutes
Hand(hr*5,50); //Hours
if(toggle){Hand(tm.sec,90);} //Seconds
}
else
{
us = 500000 + micros();
if(toggle) toggle=LOW; else toggle=HIGH;

t++;
}
}
</syntaxhighlight>

Vector Clock - Revision history

Legg: Created page with "==Synopsis== Use an oscilloscope in XY mode to display time. Uses two MCP4725 and a DS1302. ==Notes== Known bug. 12 hour hand is missing. Hour hand does not creep, but inst..."