This is my second project taken to full completion and it is certainly my most coplex to date. It is a pretend gas pump, user can select grade and the pump is triggered by a magnet in the play car. I even used a few trimpots on the board so I can change the price of gas with ease…
and here’s a quick video…
and of course for here’s the code…
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"
#include <Wire.h>
Adafruit_7segment matrix1 = Adafruit_7segment();
Adafruit_7segment matrix2 = Adafruit_7segment();
Adafruit_7segment matrix3 = Adafruit_7segment();
Adafruit_7segment matrix4 = Adafruit_7segment();
Adafruit_7segment matrix5 = Adafruit_7segment();
// program uses Adafruit 7 segment LED diplays w/ I2C backback
//define pin names
int regularLed = 2;
int superLed = 3;
int premiumLed = 4;
int regularPin = 5;
int superPin = 6;
int premiumPin = 7;
int pumpPin = 8;
int pricePin = 10;
int setLED = 11;
//analog pins for setting current prices using trim pots
int RegularPricePin = 15;
int SuperPricePin = 16;
int PremiumPricePin = 17;
int gradeselected = 0; //tells us whether a grade has been chosen
int sample = 100; //number of samples taken from trim pots to normalize readings
//varibles for price and purchase calculations
float RegularPrice = 0.00;
float SuperPrice = 0.00;
float PremiumPrice = 0.00;
float price = 0.00;
float gallons = 0.00;
float total = 0.00;
float RegularSum = 0;
float SuperSum = 0;
float PremiumSum = 0;
void setup()
{
//i dont't know what this does but it is needed for the I2C backback to work
#ifndef __AVR_ATtiny85__
Serial.begin(9600);
#endif
//initializing the 7 segment displays
matrix1.begin(0x70); //purchase total
matrix2.begin(0x71); //gallons per purchase
matrix3.begin(0x72); //regular
matrix4.begin(0x73); //super
matrix5.begin(0x74); //premium
//set all pins to input and connect to internal pull up resistor
for (int x = 0; x < 20; x++)
{
pinMode(x, INPUT_PULLUP);
}
//reset analog pin for setting prices
pinMode(15, INPUT);
pinMode(16, INPUT);
pinMode(17, INPUT);
//reset pins to output for LED's
pinMode(setLED, OUTPUT);
pinMode(regularLed, OUTPUT);
pinMode(superLed, OUTPUT);
pinMode(premiumLed, OUTPUT);
//turn the LEDs on
digitalWrite(regularLed, HIGH);
digitalWrite(superLed, HIGH);
digitalWrite(premiumLed, HIGH);
//all zero's on Gallons and Total screens
matrix1.writeDigitNum(1,0,true);
matrix1.writeDigitNum(3,0,true);
matrix1.writeDigitNum(4,0,true);
matrix1.writeDigitNum(0,0,true);
matrix1.writeDigitRaw(2, 0x002);
matrix1.writeDisplay();
matrix2.writeDigitNum(1,0,true);
matrix2.writeDigitNum(3,0,true);
matrix2.writeDigitNum(4,0,true);
matrix2.writeDigitNum(0,0,true);
matrix2.writeDigitRaw(2, 0x002);
matrix2.writeDisplay();
//set prices for the grades
delay(500);
RegularPrice = (analogRead(RegularPricePin) / 100.00);
delay(500);
SuperPrice = (analogRead(SuperPricePin) / 100.00);
delay(500);
PremiumPrice = (analogRead(PremiumPricePin) / 100.00);
delay(500);
//display current prices
matrix3.println(RegularPrice);
matrix3.writeDigitRaw(2, 0x002);
matrix3.writeDisplay();
matrix4.println(SuperPrice);
matrix4.writeDigitRaw(2, 0x002);
matrix4.writeDisplay();
matrix5.println(PremiumPrice);
matrix5.writeDigitRaw(2, 0x002);
matrix5.writeDisplay();
//take a break for everything to settle
delay(100);
}
void loop()
{
setprices(); //set prices funtion does nothing unless the "programming" button is held
//if grade selected is regular
if (digitalRead(regularPin) == LOW)
{
//turn off the other lights
digitalWrite(regularLed, HIGH);
digitalWrite(superLed, LOW);
digitalWrite(premiumLed, LOW);
//Serial.println("Pumping Regular");
//reset gallons and total displays to zero's
matrix1.println(total);
matrix1.writeDigitNum(1,0,true);
matrix1.writeDigitNum(3,0,true);
matrix1.writeDigitNum(4,0,true);
matrix1.writeDigitRaw(2, 0x002);
matrix1.writeDisplay();
matrix2.println(gallons);
matrix2.writeDigitNum(1,0,true);
matrix2.writeDigitNum(3,0,true);
matrix2.writeDigitNum(4,0,true);
matrix2.writeDigitRaw(2, 0x002);
matrix2.writeDisplay();
//dim display for grades not being used
matrix3.setBrightness(15);
matrix4.setBrightness(0);
matrix5.setBrightness(0);
// prepare variables for new purchase
gallons = 0;
price = RegularPrice;
gradeselected = 1;
}
// if grade selected is super
if (digitalRead(superPin) == LOW)
{
//turn of the other lights
digitalWrite(regularLed, LOW);
digitalWrite(superLed, HIGH);
digitalWrite(premiumLed, LOW);
//Serial.println("Pumping Super");
//reset gallons and total display to all zero's
matrix1.println(total);
matrix1.writeDigitNum(1,0,true);
matrix1.writeDigitNum(3,0,true);
matrix1.writeDigitNum(4,0,true);
matrix1.writeDigitRaw(2, 0x002);
matrix1.writeDisplay();
matrix2.println(gallons);
matrix2.writeDigitNum(1,0,true);
matrix2.writeDigitNum(3,0,true);
matrix2.writeDigitNum(4,0,true);
matrix2.writeDigitRaw(2, 0x002);
matrix2.writeDisplay();
//dim displays for grades not being used
matrix3.setBrightness(0);
matrix4.setBrightness(15);
matrix5.setBrightness(0);
//prepare variables for new purchase
gallons = 0;
price = SuperPrice;
gradeselected = 1;
}
// if grade selected is premium
if (digitalRead(premiumPin) == LOW)
{
//turn off the other lights
digitalWrite(regularLed, LOW);
digitalWrite(superLed, LOW);
digitalWrite(premiumLed, HIGH);
//Serial.println("Pumping Premium");
//reset grade and total displays to zeros
matrix1.println(total);
matrix1.writeDigitNum(1,0,true);
matrix1.writeDigitNum(3,0,true);
matrix1.writeDigitNum(4,0,true);
matrix1.writeDigitRaw(2, 0x002);
matrix1.writeDisplay();
matrix2.println(gallons);
matrix2.writeDigitNum(1,0,true);
matrix2.writeDigitNum(3,0,true);
matrix2.writeDigitNum(4,0,true);
matrix2.writeDigitRaw(2, 0x002);
matrix2.writeDisplay();
//dim displays for grades not being used
matrix3.setBrightness(0);
matrix4.setBrightness(0);
matrix5.setBrightness(15);
//prepare variables for new purchase
gallons = 0;
price = PremiumPrice;
gradeselected = 1;
}
//if pump handle is placed in the car (used magnetic reed sensor
if ((digitalRead(pumpPin) == LOW) && (gradeselected == 1))
{
pumping();//funtion to simulate fillin' 'er up!
}
}
void pumping()
{
//run as long as pump stays in car maxes out at 16 gallons
while((digitalRead(pumpPin) == LOW) && (gallons < 16))
{
gallons = gallons + .1; //increment gallons by .1
total = gallons * price; //calculate current total
//display purchase total
matrix1.println(total);
matrix1.writeDigitRaw(2, 0x002);
matrix1.writeDisplay();
//display gallons for current purchase
matrix2.println(gallons);
matrix2.writeDigitRaw(2, 0x002);
matrix2.writeDisplay();
//slow it down to be realistic
delay(100);
}
tone(9,400,1000); //play a sound to indicate end of purchase
//Serial.println("DONE");
gradeselected = 0; //reset to no grade selected
//turn all lights back on
digitalWrite(regularLed, HIGH);
digitalWrite(superLed, HIGH);
digitalWrite(premiumLed, HIGH);
//turn all displays back up
matrix3.setBrightness(15);
matrix4.setBrightness(15);
matrix5.setBrightness(15);
//reset for next purchase
total = 0.00;
gallons = 0.00;
}
void setprices()
{
//runs if programing button is held in
while((digitalRead(pricePin) == LOW))
{
digitalWrite(setLED , HIGH); //LED on pcb indicates programming mode is active
//takes set number of readings from regular trim pot and calculates average
for (int x = 0; x < sample; x++)
{
RegularSum += (analogRead(RegularPricePin) / 100.00);
}
RegularPrice = RegularSum / sample;
RegularSum = 0; //reset for next sampling
//takes set number of readings from super trim pot and calculates average
for (int x = 0; x < sample; x++)
{
SuperSum += (analogRead(SuperPricePin) / 100.00);
}
SuperPrice = SuperSum / sample;
SuperSum = 0;//reset for next sampling
//takes set number of readings from premium trim pot and calculates average
for (int x = 0; x < sample; x++)
{
PremiumSum += (analogRead(PremiumPricePin) / 100.00);
}
PremiumPrice = PremiumSum / sample;
PremiumSum = 0;//reset for next sampling
//display current prices
matrix3.println(RegularPrice);
matrix3.writeDigitRaw(2, 0x002);
matrix3.writeDisplay();
matrix4.println(SuperPrice);
matrix4.writeDigitRaw(2, 0x002);
matrix4.writeDisplay();
matrix5.println(PremiumPrice);
matrix5.writeDigitRaw(2, 0x002);
matrix5.writeDisplay();
delay(100); //don't get ahead of your self!
}
digitalWrite(setLED, LOW); //turn LED off to indicate programming mode exit
}
any thing you see that you might now a simpler way to do I would love to here about.
twelch:
I even used a few trimpots on the board so I can change the price of gas with ease....
You will definitely need that feature to maintain realism. XD
I considered setting the prices to "arm", "leg", "soul" but figured kids wouldn't get the joke...
twelch:
I considered setting the prices to "arm", "leg", "soul" but figured kids wouldn't get the joke...
rofl
You would not be ale to fill up as you only have 2 arms ]
So give me your soul ]
Jantje