Hi,
i found this code to count the amout of money inserted into an CH-926 coin acceptor and show it on an LCD display. However, I want to use it with an I2C LCD. I tried changing th code but somehow I am not able to (it should be an easy task). If I now insert a coin the value on my I2C LCD does not change. Could anyone help me?
#include <LiquidCrystal.h>
#define COIN_PIN 2 // Only some pins can be used. Refer to https://www.arduino.cc/en/Reference/attachInterrupt
#define PULSE_TIMEOUT_MS 200 // In fast mode, each pulse is 20ms, with an interval of 100ms
#define LCD_RS_PIN 12
#define LCD_E_PIN 11
#define LCD_D4_PIN 10
#define LCD_D5_PIN 9
#define LCD_D6_PIN 8
#define LCD_D7_PIN 7
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(LCD_RS_PIN, LCD_E_PIN, LCD_D4_PIN, LCD_D5_PIN, LCD_D6_PIN, LCD_D7_PIN);
volatile int creditInCents = 0;
volatile long lastCreditChangeTime = 0;
byte anim1[8] = {
B00000,
B00000,
B00000,
B11111,
B00000,
B00000,
B00000,
};
byte anim2[8] = {
B00000,
B00000,
B11111,
B11111,
B11111,
B00000,
B00000,
};
byte anim3[8] = {
B00000,
B11111,
B11111,
B11111,
B11111,
B11111,
B00000,
};
byte anim4[8] = {
B11111,
B11111,
B11111,
B11111,
B11111,
B11111,
B11111,
};
byte anim5[8] = {
B11111,
B11111,
B11111,
B00000,
B11111,
B11111,
B11111,
};
void setup() {
// Debugging output
Serial.begin(115200);
lcd.begin(16, 2);
Serial.print("Initializing... ");
lcd.print("Initializing... ");
// COIN is just a NO or NC switch to GND according to the switch on the back
// so it requires a pull-up
pinMode(COIN_PIN, INPUT_PULLUP);
// I configured it as NO to reduce power consumption through the pull-up when idle
// so we trigger the interrupt on falling edge
attachInterrupt(digitalPinToInterrupt(COIN_PIN), onCoinPulse, FALLING);
lcd.createChar(1, anim1);
lcd.createChar(2, anim2);
lcd.createChar(3, anim3);
lcd.createChar(4, anim4);
lcd.createChar(5, anim5);
lcd.begin(16, 2);
resetAnimation();
// Print a message to the LCD.
lcd.clear();
lcd.print("Come and play!");
displayCredit();
Serial.println("Ready.");
}
// total amount of money collected, in cents
// Note that using an int instead of float makes sure we have no decimal issues in comparison
// executed for every pulse;
void onCoinPulse() {
// Make sure this is a real pulse and not a spurious glitch
delay(1);
if(digitalRead(COIN_PIN)==LOW) {
creditInCents += 10;
lastCreditChangeTime = millis();
}
else{
Serial.println("glitch");
}
}
long previousCreditInCents = 0;
void loop() {
if (previousCreditInCents != creditInCents) {
long now = millis();
if (now - lastCreditChangeTime > PULSE_TIMEOUT_MS) {
displayCredit();
previousCreditInCents = creditInCents;
}
else {
displayCountingAnimation();
}
}
}
void displayCredit() {
resetAnimation();
String creditInfo = String("Credit: ") + (creditInCents/100.0) + "EUR ";
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the credit:
lcd.print(creditInfo);
Serial.println(creditInfo);
}
byte animation[16];
void resetAnimation() {
animation[0]=1;
animation[1]=1;
animation[2]=1;
animation[3]=1;
animation[4]=1;
animation[5]=1;
animation[6]=1;
animation[7]=1;
animation[8]=2;
animation[9]=3;
animation[10]=4;
animation[11]=5;
animation[12]=5;
animation[13]=4;
animation[14]=3;
animation[15]=2;
}
void displayCountingAnimation() {
Serial.print(".");
// print an animation on LCD
lcd.setCursor(0, 1);
byte firstChar = animation[0];
for (int i = 0; i < 15; i++) {
animation[i] = animation[i+1];
lcd.write(animation[i]);
}
animation[15] = firstChar;
lcd.write(animation[15]);
delay(200);
}
