From 8f4658e6aeeff5effd988d37bdfa05b401ebf9d9 Mon Sep 17 00:00:00 2001
From: Dennis Gunia <mail@dennisgunia.de>
Date: Fri, 24 Nov 2023 13:57:08 +0100
Subject: [PATCH] Added digispark

---
 README.md                                     | 16 +++-
 firmware_digispark/firmware_digispark.ino     | 88 +++++++++++++++++++
 .../firmware_promicro.ino                     |  0
 3 files changed, 100 insertions(+), 4 deletions(-)
 create mode 100644 firmware_digispark/firmware_digispark.ino
 rename song_pedal.ino => firmware_promicro/firmware_promicro.ino (100%)

diff --git a/README.md b/README.md
index 2449d87..f8b46f7 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,22 @@
 Worship switcher is a simple device for switching chord-sheet pages on the fly.
 
 ## Hardware
-WorshipSwitcher is designed arround the Arduino Pro Micro. All you need to build your own is:
-* Arduino Pro Micro (Make sure it is a Pro Micro and not a Pro Mini)
+WorshipSwitcher is designed arround the Arduino Pro Micro and the Digispark. All you need to build your own is:
+* Arduino Pro Micro (Make sure it is a Pro Micro and not a Pro Mini) or Digispark
 * Two push buttons
 
-The Push-Buttons connect to Pin 8 and 9. Pins 8 and 9 are configured as active-low with internal oush.up resistors. Therefore the switches need to be connected against ground.
+### Wiring for the Arduino Pro Micro
+The Push-Buttons connect to Pin 8 and 9. Pins 8 and 9 are configured as active-low with internal pushup resistors. Therefore the switches need to be connected against ground.
+
+### Wiring for the Digispark
+The Push-Buttons connect to P0 and P2. Pins P0 and P2 are configured as active-low with internal pushup resistors. Therefore the switches need to be connected against ground.
+Pin P1 is connected to the internal LED. It blinks when the USb Keybioard is initialized and it is ready to be used.
 
 ## Software
-The firmware is designed for Acrobat Reader for iOS in Single Page mode.
+The firmware is designed for Acrobat Reader for iOS in Single Page mode. It also works with OnSong. 
+
+The mapped keycodes are PAGE_UP and PAGE_DOWN.
+In onsong, this mimics the behaviour of the AirTurn Pedals and can be mapped to various functions. 
 
 ## Usage
 ### Button 1 - Back / Top
diff --git a/firmware_digispark/firmware_digispark.ino b/firmware_digispark/firmware_digispark.ino
new file mode 100644
index 0000000..08f8b68
--- /dev/null
+++ b/firmware_digispark/firmware_digispark.ino
@@ -0,0 +1,88 @@
+#include "DigiKeyboard.h"
+
+#define SW_1_PIN 0
+#define SW_2_PIN 2
+#define debounceTimeConst 200   //debounce time in ms
+
+unsigned long sw1_debounce = 0; //debounce var (last time button was pressed)
+unsigned long sw2_debounce = 0; //debounce var (last time button was pressed)
+void setup() {
+  // don't need to set anything up to use DigiKeyboard
+  pinMode(SW_1_PIN, INPUT_PULLUP);
+  pinMode(SW_2_PIN, INPUT_PULLUP);
+  DigiKeyboard.sendKeyStroke(0);  
+  DigiKeyboard.delay(100);
+}
+
+int ledState = LOW;  // ledState used to set the LED
+unsigned long previousMillis = 0;  // will store last time LED was updated
+
+
+void loop() {
+  unsigned long now = millis();           //timestamp of start of loop
+  // debounce button 1
+  if(digitalRead(SW_1_PIN) == false){
+    if(sw1_debounce + debounceTimeConst < now){
+      unsigned long pressed = millis();   //store time when button is pressed
+      delay(150);                         //initial delay to compensate bounce
+      while( digitalRead(SW_1_PIN) == false ){
+        // wait for button release
+      }
+      if (pressed + 1000 > millis() ) {
+        // pressed shorter than 1s
+        pdf_up();
+      }else{
+        // pressed longer than 1s
+        pdf_top();
+      }
+    }
+    sw1_debounce = now;    
+  }
+
+  // debounce button 2
+  if(digitalRead(SW_2_PIN) == false){
+    if(sw2_debounce + debounceTimeConst < now){ pdf_down(); }
+    sw2_debounce = now;
+  }
+  //Serial.println(sw1_debounce);
+
+  unsigned long currentMillis = millis();
+  if (currentMillis - previousMillis >= 500) {
+    previousMillis = currentMillis;
+    if (ledState == LOW) {
+      ledState = HIGH;
+    } else {
+      ledState = LOW;
+    }
+    digitalWrite(1, ledState);
+  }
+}
+
+#define KEY_RIGHT_ARROW       0x4F     // Keyboard RightArrow  -> Alternative arrow keys names
+#define KEY_LEFT_ARROW        0x50     // Keyboard LeftArrow
+#define KEY_DOWN_ARROW        0x51     // Keyboard DownArrow
+#define KEY_UP_ARROW          0x52     // Keyboard UpArrow
+#define KEY_PAGE_UP           0x4B     // Keyboard PageUp
+#define KEY_DELETE            0x4C     // Keyboard Delete Forward
+#define KEY_END               0x4D     // Keyboard End
+#define KEY_PAGE_DOWN         0x4E     // Keyboard PageDown
+#define KEY_HOME              0x4A     // Keyboard Home
+//Keyborad Event definitions
+
+void pdf_up() {
+    DigiKeyboard.sendKeyStroke(KEY_PAGE_UP);  
+    //Keyboard.press(KEY_LEFT_ARROW);  
+    DigiKeyboard.delay(100);
+}
+
+void pdf_down() {
+    DigiKeyboard.sendKeyStroke(KEY_PAGE_DOWN);  
+    //Keyboard.press(KEY_RIGHT_ARROW);  
+    DigiKeyboard.delay(100);
+}
+
+void pdf_top() {
+    DigiKeyboard.sendKeyStroke(KEY_HOME);  
+    //Keyboard.press(KEY_RIGHT_ARROW);  
+    DigiKeyboard.delay(100);
+}
diff --git a/song_pedal.ino b/firmware_promicro/firmware_promicro.ino
similarity index 100%
rename from song_pedal.ino
rename to firmware_promicro/firmware_promicro.ino