Introduction: The Final Curtain - the Shower Timer
I needed a timer for the bath with a nice big screen you can see during the shower, hence The Final Curtain
Step 1: Parts List
Arduino pro mini
Potentiometer
Momentary Push Button
220 ohm Resistor
On/Off switch
Battery Case an batteries
Copper tape
some wires
Dual (8 digits) max7291 7-segment display
Piezo buzzer
Step 2: Diagram
Most of it you can understand from the diagram,
I'm using two stripes of copper tape one for ground the other 5v.
Each component is soldered to them as needed.
just remember to send it a bit with a flat screw to pill it's lamination.
Step 3: Push Button
The push button is connented to 5v at the first pin and to both the arduino digital 4 pin and through a 220ohm resistor to ground (pull down) at the second pin.
Step 4: Potentiometer
pin 1 is connected to 5v
pin 2 is connected to arduino analog pin 0
pin 3 is connected to ground
Step 5: Piezzo Buzzer
Long pin (positive) is connected to arduino PWM 3 (digital 3)
Short pin is connected to ground
Step 6: Dual (8 Digits) Max7291 7-segment Display
DIN connected to arduino pin 5
CS connected to arduino pin 6
CLK connected to arduino pin 7
VCC connected to 5v
GND is connected to ground
Step 7: ON / OFF Switch
pin 1 connected to battery case's Red wire
pin 2 connected to arduino RAW
pin 3 is not connected.
The second black / blue wire of the battery case is connected to arduino GND
Step 8: THE CODE
#define MAX7219_DIN 5
#define MAX7219_CS 6 #define MAX7219_CLK 7
#define Bot 4 #define BZzz 3 #define Pot 0
boolean runMode = false; long runTime = 0;
void initialise()
{
digitalWrite(MAX7219_CS, HIGH);
pinMode(MAX7219_DIN, OUTPUT);
pinMode(MAX7219_CS, OUTPUT);
pinMode(MAX7219_CLK, OUTPUT);
}void output(byte address, byte data)
{
digitalWrite(MAX7219_CS, LOW);
shiftOut(MAX7219_DIN, MAX7219_CLK, MSBFIRST, address);
shiftOut(MAX7219_DIN, MAX7219_CLK, MSBFIRST, data);
digitalWrite(MAX7219_CS, HIGH);
}void setup() {
Serial.begin (9600);
pinMode (Bot, INPUT);
pinMode (BZzz, OUTPUT);
// put your setup code here, to run once:
initialise();
output(0x0f, 0x00); //display test register - test mode off
output(0x0c, 0x01); //shutdown register - normal operation
output(0x0b, 0x07); //scan limit register - display digits 0 thru 7
output(0x0a, 0x0f); //intensity register - max brightness
output(0x09, 0xff); //decode mode register - CodeB decode all digits
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15); //digit 0 (rightmost digit) data}
void loop() {
if (!runMode){
runTime = analogRead (Pot);
runTime = map (runTime, 5, 1020, 1, 12) * 5;
Serial.println (runTime);
output(0x05, runTime % 10);
output(0x06, runTime / 10);
if (digitalRead (Bot)) {
delay (20);
runTime = runTime * 60000 + millis();
tone (BZzz, 1000);
delay (300);
noTone (BZzz);
runMode = true;
}
if (runMode) {
int Bip = true;
while (millis() <= runTime) {
int minuts, seconds;
minuts = (runTime - millis ()) / 60000 ;
Serial.print (minuts);
output(0x05, minuts % 10);
output(0x06, minuts / 10);
Serial.print (" : ");
seconds = ((runTime - millis ()) % 60000) / 1000;
Serial.println (seconds);
output(0x01, seconds % 10);
output(0x02, seconds / 10);
if (digitalRead (Bot)) {
Bip = false;
delay (100);
break;
}
//delay (1000);
}
if (Bip) {
for (int i = 1; i <= 10; i++) {
tone (BZzz, 1000);
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
delay (200);
Serial.println ("Bip Bip Bip...");
noTone (BZzz);
output(0x08, 10); //digit 7 (leftmost digit) data
output(0x07, 10);
output(0x06, 10);
output(0x05, 10);
output(0x04, 10);
output(0x03, 10);
output(0x02, 10);
output(0x01, 10);
delay (200);
tone (BZzz, 1000);
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
delay (200);
Serial.println ("Bip Bip Bip...");
noTone (BZzz);
output(0x08, 10); //digit 7 (leftmost digit) data
output(0x07, 10);
output(0x06, 10);
output(0x05, 10);
output(0x04, 10);
output(0x03, 10);
output(0x02, 10);
output(0x01, 10);
delay (400);
}
}
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
runMode = false;
}
}}
Step 9: Firmware Version Update
The update adds a stopwatch functionality.
Also, when the timer finish counting and beeping, its starts counting the time passed since the end of the timer and stops only on button press.
#define MAX7219_DIN 5
#define MAX7219_CS 6 #define MAX7219_CLK 7
#define Bot 4 #define BZzz 3 #define Pot 0
#define stopWatch 65
boolean runMode = false, stopWatchMode; long runTime = 0;
void initialise()
{
digitalWrite(MAX7219_CS, HIGH);
pinMode(MAX7219_DIN, OUTPUT);
pinMode(MAX7219_CS, OUTPUT);
pinMode(MAX7219_CLK, OUTPUT);
}void output(byte address, byte data)
{
digitalWrite(MAX7219_CS, LOW);
shiftOut(MAX7219_DIN, MAX7219_CLK, MSBFIRST, address);
shiftOut(MAX7219_DIN, MAX7219_CLK, MSBFIRST, data);
digitalWrite(MAX7219_CS, HIGH);
}void setup() {
Serial.begin (9600);
pinMode (Bot, INPUT);
pinMode (BZzz, OUTPUT);
// put your setup code here, to run once:
initialise();
output(0x0f, 0x00); //display test register - test mode off
output(0x0c, 0x01); //shutdown register - normal operation
output(0x0b, 0x07); //scan limit register - display digits 0 thru 7
output(0x0a, 0x0f); //intensity register - max brightness
output(0x09, 0xff); //decode mode register - CodeB decode all digits
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15); //digit 0 (rightmost digit) data}
void loop() {
if (!runMode){
runTime = analogRead (Pot);
runTime = map (runTime, 5, 1020, 1, 14) * 5;
if (runTime == 70) {
runTime = 65;
}
Serial.println (runTime);
if (runTime <= 60) {
output(0x05, runTime % 10);
output(0x06, runTime / 10);
output(0x01, 15);
output(0x02, 15);
stopWatchMode = false;
}
if (runTime == stopWatch) {
stopWatchMode = true;
output(0x01, 0);
output(0x02, 0);
output(0x05, 0);
output(0x06, 0);
}
if (digitalRead (Bot)) {
delay (40);
if (!stopWatchMode) {
runTime = runTime * 60000 + millis();
tone (BZzz, 300);
delay (300);
} else {
runTime = millis ();
tone (BZzz, 200);
delay (400);
}
noTone (BZzz);
runMode = true;
}
if (runMode) {
if (!stopWatchMode) {
int Bip = true;
while (millis() <= runTime) {
int minuts, seconds;
minuts = (runTime - millis ()) / 60000 ;
Serial.print (minuts);
output(0x05, minuts % 10);
output(0x06, minuts / 10);
Serial.print (" : ");
seconds = ((runTime - millis ()) % 60000) / 1000;
Serial.println (seconds);
output(0x01, seconds % 10);
output(0x02, seconds / 10);
if (digitalRead (Bot)) {
while (digitalRead (Bot)) {
Bip = false;
runMode = false;
stopWatchMode = false;
//Serial.println ("all False");
output(0x08, 10); //digit 7 (leftmost digit) data
output(0x07, 10);
output(0x06, 10);
output(0x05, 10);
output(0x04, 10);
output(0x03, 10);
output(0x02, 10);
output(0x01, 10);
}
break;
} //end if digitalRead Bot
}
if (Bip) {
runTime = millis ();
for (int i = 1; i <= 10; i++) {
tone (BZzz, 300);
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
delay (200);
Serial.println ("Bip Bip Bip...");
noTone (BZzz);
output(0x08, 10); //digit 7 (leftmost digit) data
output(0x07, 10);
output(0x06, 10);
output(0x05, 10);
output(0x04, 10);
output(0x03, 10);
output(0x02, 10);
output(0x01, 10);
delay (200);
tone (BZzz, 300);
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
delay (200);
Serial.println ("Bip Bip Bip...");
noTone (BZzz);
output(0x08, 10); //digit 7 (leftmost digit) data
output(0x07, 10);
output(0x06, 10);
output(0x05, 10);
output(0x04, 10);
output(0x03, 10);
output(0x02, 10);
output(0x01, 10);
delay (400);
stopWatchMode = true;
}
} // end void Bip
output(0x08, 15); //digit 7 (leftmost digit) data
output(0x07, 15);
output(0x06, 15);
output(0x05, 15);
output(0x04, 15);
output(0x03, 15);
output(0x02, 15);
output(0x01, 15);
//runMode = false;
} // end of runMode !stopWatchMode (timer Mode)
if (stopWatchMode) { // StopWatch Run Mode begin
int minuts, seconds;
while (!digitalRead (Bot)) {
minuts = (millis () - runTime) / 60000 ;
Serial.print (minuts);
output(0x05, minuts % 10);
output(0x06, minuts / 10);
Serial.print (" : ");
seconds = ((millis () - runTime) % 60000) / 1000;
Serial.println (seconds);
output(0x01, seconds % 10);
output(0x02, seconds / 10);
}
runMode = false;
stopWatchMode = false;
delay (500);
}
}
}}
