From 917fb61e7d1d19ef434b64a76a0e3ba195e6e85e Mon Sep 17 00:00:00 2001
From: Frank DeMarco <if.self.end@gmail.com>
Date: Wed, 1 Aug 2018 20:08:25 -0400
Subject: [PATCH] bidirectional

---
 resource/scores   |  1 +
 serial/serial.ino | 94 +++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 83 insertions(+), 12 deletions(-)

diff --git a/resource/scores b/resource/scores
index c236b0a..c281cda 100644
--- a/resource/scores
+++ b/resource/scores
@@ -9,3 +9,4 @@
 5999999
 5999999
 293967
+283074
diff --git a/serial/serial.ino b/serial/serial.ino
index 03506fc..496d790 100644
--- a/serial/serial.ino
+++ b/serial/serial.ino
@@ -1,17 +1,21 @@
 // Generally, you should use "unsigned long" for variables that hold time
 // The value will quickly become too large for an int to store
-unsigned long previousMillis = 0;        // will store last time LED was updated
+unsigned long previousMillis = 0; // will store last time LED was updated
 
 // constants won't change:
-const long interval = 500;           // interval at which to blink (milliseconds)
+const long interval = 500; // interval at which to blink (milliseconds)
 
 int pushButton1 = 2;
 int pushButton2 = 4;
 int pushButton3 = 6;
 int pushButton4 = 11;
 
-int buttons[4] = {pushButton1, pushButton2, pushButton3, pushButton4};
-
+int buttons[4] = {
+  pushButton1,
+  pushButton2,
+  pushButton3,
+  pushButton4
+};
 
 void setup() {
   // set the digital pin as output:
@@ -23,8 +27,72 @@ void setup() {
   pinMode(pushButton4, INPUT_PULLUP);
 }
 
-void loop() {  
-  bool received_input = false;
+bool testConnection2(int A, int B) {
+  for (int i = 0; i < 4; i++) {
+    if (i == A) {
+      pinMode(buttons[i], OUTPUT);
+      digitalWrite(buttons[i], LOW);
+    } else {
+//      digitalWrite(buttons[i], HIGH);
+      pinMode(buttons[i], INPUT_PULLUP);
+    }
+  }
+//  delay(10);
+
+  if (!digitalRead(buttons[B])) {
+    return true;
+  } else {
+    return false;
+  }
+}
+bool testConnection(int A, int B) {
+  return testConnection2(A, B) && testConnection2(B, A);
+}
+
+// int lastNumber = -1;
+
+void loop() {
+
+  if (testConnection(0, 1)) {
+//    if (lastNumber != 01) {
+//      lastNumber = 01;
+      Serial.println("0011");
+//    }
+  } else if (testConnection(0, 2)) {
+//    if (lastNumber != 02) {
+//      lastNumber = 02;
+      Serial.println("0101");
+//    }
+  } else if (testConnection(0, 3)) {
+//    if (lastNumber != 03) {
+//      lastNumber = 03;
+      Serial.println("1001");
+//    }
+  } else if (testConnection(1, 2)) {
+//    if (lastNumber != 12) {
+//      lastNumber = 12;
+      Serial.println("0110");
+//    }
+  } else if (testConnection(1, 3)) {
+//    if (lastNumber != 13) {
+//      lastNumber = 13;
+      Serial.println("1010");
+//    }
+  } else if (testConnection(2, 3)) {
+//    if (lastNumber != 23) {
+//      lastNumber = 23;
+      Serial.println("1100");
+//    }
+//  } else {
+//    if (lastNumber != 0) {
+//      lastNumber = 0;
+//      Serial.println("0000");
+//    }
+  }
+}
+
+/*
+  
   for (int ii = 0; ii < 4; ii++)
   {
     for (int jj = 0; jj < 4; jj++)
@@ -58,10 +126,12 @@ void loop() {
         received_input = true;
         break;
       }
-    }
-    if (received_input)
-    {
-      break;
-    }
+   }
+   
+    
+  //  if (received_input)
+  //  {
+   //   break;
+   // }
   }
-}
+  */