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Sketch for small USB-powered device to open Came gates with known codes - you need to put your codes in file after `// Defind gate codes` line. (You may use RCSwitch library to sniff gate code from air - it works fine for reception but I failed to use it for transmission so custom function is used).

Device itself consists of Arduino Nano, 3x4 Keypad and 433 MHz transmitter. Each button have a 24-bit code assigned - this code is send via @433 MHz with Came-gate encoding. Pins from 3 to 9 are connected to Keypad, pin 11 is connected to trasmitter DATA pin. Transmitted is powered from GND and +5V pins of Arduino.

Author: titov-vv

Came_Gates_Control.ino

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+#include <Keypad.h>
+//=================================================================================================
+#define TX_PIN  11
+#define LED_PIN 13
+#define BIT_LEN         320
+#define BLINK_INTERVAL  500
+//=================================================================================================
+// Setup Keypad
+const byte ROWS = 4;
+const byte COLS = 3;
+char keys[ROWS][COLS] = 
+{
+  {'1','2','3'},
+  {'4','5','6'},
+  {'7','8','9'},
+  {'*','0','#'}
+};
+byte rowPins[ROWS] = {8, 3, 4, 6}; 
+byte colPins[COLS] = {7, 9, 5}; 
+
+Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+//=================================================================================================
+// Defind gate codes
+#define GATE_MAIN_IN       0xAAAAAA
+#define GATE_MAIN_OUT      0xBBBBBB
+#define GATE_PARK_NEAR_IN  0xCCCCCC
+#define GATE_PARK_NEAR_OUT 0xDDDDDD
+#define GATE_PARK_FAR_IN   0xEEEEEE
+#define GATE_PARK_FAR_OUT  0xFFFFFF
+//=================================================================================================
+// Global variables
+unsigned long previousMillis = 0; 
+int LED_state = LOW;
+//=================================================================================================
+// Send code vith help of 433 MHz transmitter connected to TX_PIN
+void SendCame(unsigned long code)
+{
+  int repeat_count;
+  repeat_count = 24;
+
+  for (int j=0; j<repeat_count; j++)
+  {
+    digitalWrite(TX_PIN, LOW);
+    delayMicroseconds(BIT_LEN * 63);
+    digitalWrite(TX_PIN, HIGH);
+    delayMicroseconds(BIT_LEN);
+    
+    //Sending bit by bit
+    for (int i=23; i>=0; i--)
+    {  // 0 -> 011, 1 -> 001
+      byte b = bitRead(code, i);
+
+      digitalWrite(TX_PIN,LOW);
+      delayMicroseconds(BIT_LEN);
+      
+      if (!b)
+        digitalWrite(TX_PIN,HIGH);
+      delayMicroseconds(BIT_LEN);
+      
+      digitalWrite(TX_PIN,HIGH);
+      delayMicroseconds(BIT_LEN);
+    }
+    digitalWrite(TX_PIN,LOW);
+    delay(16);
+  }
+}
+//-------------------------------------------------------------------------------------------------
+void setup()
+{
+  delay(200);
+  
+  // Setup outpus for transmitter and LED pins
+  pinMode(TX_PIN, OUTPUT);
+  pinMode(LED_PIN, OUTPUT);
+  
+  Serial.begin(9600);   // Kept for keypad diagnostics
+}
+//-------------------------------------------------------------------------------------------------  
+void loop()
+{
+  unsigned long currentMillis = millis();
+  
+  char key = keypad.getKey();
+  
+  if (key)
+  {
+    Serial.println(key);   // Just for diagnostics
+
+    switch (key)
+    {
+      case '3':
+        SendCame(GATE_MAIN_IN);
+        break;
+      case '6':
+        SendCame(GATE_MAIN_OUT);
+        break;
+      case '9':
+        SendCame(GATE_PARK_NEAR_IN);
+        break;
+      case '#':
+        SendCame(GATE_PARK_NEAR_OUT);
+        break;
+      case '8':
+        SendCame(GATE_PARK_FAR_IN);
+        break;
+      case '0':
+        SendCame(GATE_PARK_FAR_OUT);
+        break;  
+    }
+  }
+
+  // Simply blink LED to show that board is alive
+  if (currentMillis - previousMillis >= BLINK_INTERVAL) 
+  {
+    previousMillis = currentMillis;
+    if (LED_state == LOW) 
+      LED_state = HIGH;
+    else
+      LED_state = LOW;
+    digitalWrite(LED_PIN, LED_state);
+  }
+}
+//-------------------------------------------------------------------------------------------------