Arduino Voltmeter Clock
Posted on 29/09/2015 by Adam
As soon as a saw other peoples versions of this clock I knew I wanted to make my own. Using a Arduino Pro Mini (clone) a DS1307 RTC module and three 5 volt voltmeters I was able to complete the following project in an afternoon.
I now just need to build it into a suitable enclosure.
Code / Sketch:
[code]
/*
Analog Volt Meter Clock
http://admw.uk/ib
Credits:
Instructables Link: http://www.instructables.com/id/Analog-VU-meter-and-Clock-Arduino-Powered/
bildr – DS1307 RTC code http://bildr.org/2011/03/ds1307-arduino/
_____________________
Wiring goes as follows:
– Positive power to RAW
– Negative power to GND
– Buttons – Up to Digital 2 (follow arduino tutorial: http://arduino.cc/en/uploads/Tutorial/button.png )
– Down to Digital 3
– DS1307 RTC – SDA to Analog 4
– SCL to Analog 5
– Hour Analog Meter to Digital 11 (PWM)
– Minute Analog Meter to Digital 10 (PWM)
– Second Analog Meter to Digital 9 (PWM)
_______________________
Notes:
Because all meters are slightly different, the PWM values
need to be adjusted based on your design. Feel free to use
this code, but you will have to change some values because
it is set to work specifically with my meters.
Check the value in hrPWM() !!
*/
#include "Wire.h"
#define DS1307_ADDRESS 0x68
byte zero = 0x00; //workaround for issue #527
int upButton = 2; // up push button to adjust time (pin 2)
int downButton = 3; // down push button to adjust time (pin 3)
int hours = 0;
int minutes = 0;
int seconds = 0;
int lastMinute = 0;
int hourMeter = 11; // hour meter is attached to pin 11
int minMeter = 10; // minute meter is attached to pin 10
int secMeter = 9; // second meter is attached to pin 9
void setup(){
Wire.begin();
Serial.begin(9600); //view time in serial monitor
/*
If you need to set your DS1307RTC to the correct time, uncomment the setDateTime(); line and configure
the setDateTime loop at the bottom of this sketch. Remember to comment out this line again afterwards!
*/
//setDateTime();
pinMode(hourMeter, OUTPUT); // Initialize Outputs
pinMode(minMeter, OUTPUT);
pinMode(secMeter, OUTPUT);
digitalWrite(hourMeter, HIGH); // Test meters on startup
digitalWrite(minMeter, HIGH);
digitalWrite(secMeter, HIGH);
digitalWrite(13, HIGH);
delay (1000);
digitalWrite(hourMeter, LOW);
digitalWrite(minMeter, LOW);
digitalWrite(secMeter, LOW);
digitalWrite(13, LOW);
delay(1000);
}
void loop(){
printDate();
delay(75);
// Changing the time with buttons
if (digitalRead(downButton) == HIGH){
byte second = 0;
byte minute = minutes; // Don’t get confused: minute is not the same as minutes
byte hour = hours; // Don’t get confused: hour is not the same as hours
if (minutes > 0){
–minute;
}else{
minute = 59;
if (hours > 0){
— hour;
}else{
hour = 23;
}}
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero); //stop Oscillator
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(zero); //start
Wire.endTransmission();
}
if (digitalRead(upButton) == HIGH){
byte second = 0;
byte minute = minutes; // Don’t get confused: minute is not the same as minutes
byte hour = hours; // Don’t get confused: hour is not the same as hours
if (minutes < 59){
++minute;
}else{
minute = 0;
if (hours < 23){
++ hour;
}else{
hour = 0;
}}
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero); //stop Oscillator
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(zero); //start
Wire.endTransmission();
}
}
byte decToBcd(byte val){
// Convert normal decimal numbers to binary coded decimal
return ( (val/10*16) + (val%10) );
}
byte bcdToDec(byte val) {
// Convert binary coded decimal to normal decimal numbers
return ( (val/16*10) + (val%16) );
}
void printDate(){
// Reset the register pointer
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero);
Wire.endTransmission();
Wire.requestFrom(DS1307_ADDRESS, 7);
seconds = bcdToDec(Wire.read());
minutes = bcdToDec(Wire.read());
hours = bcdToDec(Wire.read() & 0b111111); //24 hour time
//print the date
Serial.print(hours); // Un-comment to view time in serial monitor
Serial.print(":"); //
Serial.println(minutes); // Don’t forget to un-comment ‘Serial.begin’ in ‘void setup’ above
Serial.print(":"); //
Serial.println(seconds); //
hrPWM(); //Call the hrPWM loop to display correct hours
minPWM(); //Call the minPWM loop to display correct minutes
secPWM(); //Call the secPWM loop to display correct seconds
}
void hrPWM()
{
/* Specific meter levels for each hour
You will likely have to adjust these values.
Play around with the values until you get what you want
or you could attach a potentiometer to a spare input and
adjust the levels and read them over a serial connection.
*/
if (hours == 0){
analogWrite(hourMeter, 0); // adjust hour meter level
}
if (hours == 1 || hours == 13){
analogWrite(hourMeter, 23); // adjust hour meter level
}
if (hours == 2 || hours == 14){
analogWrite(hourMeter, 46); // adjust hour meter level
}
if (hours == 3 || hours == 15){
analogWrite(hourMeter, 70); // adjust hour meter level
}
if (hours == 4 || hours == 16){
analogWrite(hourMeter, 92); // adjust hour meter level
}
if (hours == 5 || hours == 17){
analogWrite(hourMeter, 113); // adjust hour meter level
}
if (hours == 6 || hours == 18){
analogWrite(hourMeter, 134); // adjust hour meter level
}
if (hours == 7 || hours == 19){
analogWrite(hourMeter, 154); // adjust hour meter level
}
if (hours == 8 || hours == 20){
analogWrite(hourMeter, 174); // adjust hour meter level
}
if (hours == 9 || hours == 21){
analogWrite(hourMeter, 192); // adjust hour meter level
}
if (hours == 10 || hours == 22){
analogWrite(hourMeter, 210); // adjust hour meter level
}
if (hours == 11 || hours == 23){
analogWrite(hourMeter, 230); // adjust hour meter level
}
if (hours == 12){
analogWrite(hourMeter, 250); // adjust hour meter level
}
}
void minPWM()
{
analogWrite(minMeter, minutes * 4.25); // 255 divided by 60 is 4.25
}
void secPWM()
{
analogWrite(secMeter, seconds * 4.25); // 255 divided by 60 is 4.25
}
void setDateTime(){
byte second = 0; //0-59
byte minute = 50; //0-59
byte hour = 18; //0-23
byte weekDay = 1; //1-7
byte monthDay = 27; //1-31
byte month = 9; //1-12
byte year = 15; //0-99
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero); //stop Oscillator
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(weekDay));
Wire.write(decToBcd(monthDay));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.write(zero); //start
Wire.endTransmission();
}
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