Create TrinketReactCounter_7segment.ino

Author: TheKitty

Trinket_React_Counter/TrinketReactCounter_7segment/TrinketReactCounter_7segment.ino

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+// Adafruit Trinket React Counter Sketch - 7-segment display
+//
+// Use a 7-segment LED backpack to display the number of times a 
+// button has been pressed.  Great for building a physical 'like'
+// or react button.  The value will be stored  in EEPROM so it 
+// will persist between power down/up.
+//
+// NOTE: As-is this sketch needs to run on a Trinket because it
+// assumes the switch on pin #1 has a pull-down resistor to ground.
+// If using another board without this pull-down you can explicitly
+// add a ~10kohm resistor from digital #1 to ground.
+//
+// Author: Tony DiCola
+// License: MIT (https://opensource.org/licenses/MIT)
+#include <EEPROM.h>
+#include <Wire.h>
+#include "Adafruit_LEDBackpack.h"
+#include "Adafruit_GFX.h"
+
+
+// Uncomment the line below to reset the counter value in EEPROM to zero.
+// After uncommenting reload the sketch and during the setup the counter
+// will be reset.  Then comment the line again and reload to start again
+// (if you don't comment it out then every time the board powers on it
+// will reset back to zero!).
+//#define RESET_COUNT
+
+// OR just hold the button for longer than the RESET_HOLD_SECOND below
+// to reset the count!
+
+// Configuration:
+#define LED_BACKPACK_ADDRESS   0x70   // I2C address of the backpack display.
+                                      // Keep the default 0x70 unless you
+                                      // change the backpack's address bridges.
+
+#define COUNT_BUTTON_PIN       1      // Digital input connected to the button that
+                                      // will increase the count. This line should
+                                      // have a pull-down resistor to ground.  The
+                                      // opposite side of the button should be
+                                      // connected to a high level like 5V or 3.3V.
+
+#define COUNT_ADDRESS          0      // Address in EEPROM to store the counter.
+                                      // This will take 2 bytes (16-bit value).
+                                      // You don't need to change this unless you
+                                      // want to play with different EEPROM locations.
+
+#define RESET_HOLD_SECONDS     5      // Number of seconds to hold the button down to
+                                      // force a reset of the count to zero.  Set to 0
+                                      // to disable this functionality.
+
+// 7-segment display
+Adafruit_7segment backpack = Adafruit_7segment();
+uint32_t holdStart = 0;
+
+void update_display() {
+  // Get the count value from EEPROM and print it to the display.
+  uint16_t count;
+  EEPROM.get(COUNT_ADDRESS, count);
+  backpack.print(count, DEC);
+  backpack.writeDisplay();
+}
+
+void setup() {
+  // Setup button inputs.
+  pinMode(COUNT_BUTTON_PIN, INPUT);
+  
+  // Initialize the LED backpack display.
+  backpack.begin(LED_BACKPACK_ADDRESS);
+
+  // Clear the count in EEPROM if desired.
+  #ifdef RESET_COUNT
+    uint16_t count = 0;
+    EEPROM.put(COUNT_ADDRESS, count);
+  #endif
+
+  // Update the display with the current count value.
+  update_display();
+
+  // Reset the last known time the button wasn't being held.
+  holdStart = millis();
+}
+
+void loop() {
+  // Take a couple button readings with a small delay in between to detect when
+  // the signal changes from high to low, i.e. the button was released.
+  int firstCount = digitalRead(COUNT_BUTTON_PIN);
+  delay(20);
+  int secondCount = digitalRead(COUNT_BUTTON_PIN);
+
+  // Check for count button release.
+  if (firstCount == HIGH && secondCount == LOW) {
+    // Button was released!
+    // Increment the count value stored in EEPROM.
+    uint16_t count;
+    EEPROM.get(COUNT_ADDRESS, count);
+    count += 1;
+    EEPROM.put(COUNT_ADDRESS, count);
+    // Update the display with the latest count value.
+    update_display();
+  }
+
+  // Reset the hold start if the button wasn't pressed (i.e. first and last were not both high levels).
+  if ((firstCount != HIGH) || (secondCount != HIGH)) {
+    holdStart = millis();
+  }
+
+  // Check if the button has been held for the amount of reset time.
+  if ((RESET_HOLD_SECONDS > 0) && ((millis() - holdStart) >= (RESET_HOLD_SECONDS*1000))) {
+    // Reset to zero and update the display!
+    uint16_t count = 0;
+    EEPROM.put(COUNT_ADDRESS, count);
+    update_display();
+    // Reset the hold time to start over again.
+    holdStart = millis();
+    // Flash the display a few times to give time to remove finger.
+    for (int i=0; i<5; ++i) {
+      delay(200);
+      backpack.clear();
+      backpack.writeDisplay();
+      delay(200);
+      update_display();
+    }
+  }
+}