add coin acceptor

software/src/coin.cpp

@@ -0,0 +1,52 @@
+#include <Arduino.h>
+
+#include "coin.h"
+#include "hardware.h"
+
+#include "esp32-hal-timer.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/xtensa_api.h"
+#include "freertos/task.h"
+#include "rom/ets_sys.h"
+#include "soc/timer_group_struct.h"
+#include "soc/dport_reg.h"
+#include "esp_attr.h"
+#include "esp_intr.h"
+
+using namespace std;
+
+portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;
+
+static volatile int pulseCounter;
+static unsigned long lastUpdate = 0;
+
+static void IRAM_ATTR handleInterrupt() {
+  portENTER_CRITICAL_ISR(&mux);
+  pulseCounter++;
+  lastUpdate = millis();
+  portEXIT_CRITICAL_ISR(&mux);
+}
+
+Coin::Coin(void) {
+  pulseCounter = 0;
+}
+
+void Coin::setup(void) {
+
+  pinMode(COIN_PULSE_PIN, INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(COIN_PULSE_PIN), handleInterrupt, FALLING);
+
+}
+
+int Coin::getMoney() {
+  if (millis() - lastUpdate <= 200) delay(200);  // make sure to wait for the last pulse
+  return pulseCounter*5;
+}
+
+void Coin::setZero() {
+  pulseCounter=0;
+}
+
+void Coin::subtractMoney(int amount) {
+  pulseCounter -= amount/5;
+}

software/src/coin.h

@@ -0,0 +1,14 @@
+#ifndef _COIN_H
+#define _COIN_H
+
+class Coin {
+  public:
+    Coin(void);
+    void setup(void);
+    int getMoney(void);
+    void setZero(void);
+    void subtractMoney(int);
+  private:
+};
+
+#endif /* _COIN_H */

software/src/hardware.h

@@ -21,6 +21,8 @@ static constexpr bool PROGMEM MQTT_SECURE = true;
 static const char* PROGMEM mqtt_username = "vending";
 static const char* PROGMEM mqtt_password = "password";
 
+static constexpr uint8_t PROGMEM COIN_PULSE_PIN = 15;
+
 #endif /* _HARDWARE_H */
 
 /* ******** pin diagram (esp32-st) ********

software/src/led.cpp

@@ -43,6 +43,10 @@ void Led::loop_dispense(void) {
   leds[NUM_LEDS-2] = CRGB::White;
 }
 
+void Led::loop_denied(void) {
+  fill_solid(leds, NUM_LEDS, CRGB::Red);
+}
+
 void Led::loop_steady(void) {
   fill_solid(leds, NUM_LEDS, color);
 }
@@ -55,6 +59,7 @@ void Led::changeAnimation(uint8_t num, uint16_t duration) {
   else if (num == 1) refresh = &Led::loop_dispense;
   else if (num == 2) refresh = &Led::loop_confetti;
   else if (num == 3) refresh = &Led::loop_rainbow;
+  else if (num == 4) refresh = &Led::loop_denied;
 }
 
 void Led::changeColor(uint8_t r, uint8_t g, uint8_t b) {

software/src/led.h

@@ -25,6 +25,7 @@ class Led {
     void loop_rainbow(void);
     void loop_confetti(void);
     void loop_dispense(void);
+    void loop_denied(void);
     uint16_t duration;
     uint8_t index;
     bool change;

software/src/main.cpp

@@ -13,6 +13,7 @@
 #include "pusher.h"
 #include "shelf.h"
 #include "led.h"
+#include "coin.h"
 #include "MyMQTT.h"
 
 #define LED_BUILTIN 2
@@ -24,6 +25,7 @@ volatile SemaphoreHandle_t xPreferencesSemaphore = xSemaphoreCreateMutex();
 Wifi wifi;
 //Webserver webserver;
 MyMQTT mqtt;
+Coin coin;
 Pusher pusher;
 Shelf* shelf;
 Led led;
@@ -48,6 +50,7 @@ void setup()
 //  delay(1000);
   shelf = new Shelf(8);
   pusher.setup();
+  coin.setup();
 //  webserver.start();
 }
 

software/src/shelf.cpp

@@ -2,11 +2,13 @@
 #include "item.h"
 #include "pusher.h"
 #include "led.h"
+#include "coin.h"
 
 using namespace std;
 
 extern Pusher pusher;
 extern Led led;
+extern Coin coin;
 
 Shelf::Shelf(int size)
     : num_items(size) {
@@ -27,14 +29,17 @@ void Shelf::reload(void) {
 
 void Shelf::dispenseTask(void* parameters) {
   Serial.println("dispensing");
-  item.at(num)->quantity--;
-  led.changeAnimation(1, 0);
-  pusher.push(num);
-  vTaskDelay(500 / portTICK_PERIOD_MS);
-  led.changeAnimation(2, 0);
-  vTaskDelay(7000 / portTICK_PERIOD_MS);
-  led.changeAnimation(0, 0);
-
+  if (coin.getMoney() > 50) {
+    item.at(num)->quantity--;
+    led.changeAnimation(1, 0);
+    pusher.push(num);
+    vTaskDelay(500 / portTICK_PERIOD_MS);
+    led.changeAnimation(2, 0);
+    vTaskDelay(7000 / portTICK_PERIOD_MS);
+    led.changeAnimation(0, 0);
+  } else {
+    led.changeAnimation(4,500);
+  }
   vTaskDelete(NULL);
 }