added PULLUP_RF_TX_DATA define

To use D3 (already pulled up) pin as a RX_DATA pin

RFLink/RFLink.h

@@ -30,14 +30,15 @@
 
 // PIN Definition
 //
+// #define PULLUP_RF_TX_DATA
 #ifdef ESP8266
 // ESP8266 D1 Mini
 #define PIN_RF_RX_PMOS NOT_A_PIN // High Side P-MOSFET, active on LOW level
 #define PIN_RF_RX_NMOS D5        // Low Side N-MOSFET, active on HIGH level
 #define PIN_RF_RX_VCC NOT_A_PIN  // Power to the receiver on this pin
 #define PIN_RF_RX_GND NOT_A_PIN  // Ground to the receiver on this pin
 #define PIN_RF_RX_NA NOT_A_PIN   // Alt. RX_DATA. Forced as input
-#define PIN_RF_RX_DATA D7        // On this input, the 433Mhz-RF signal is received. LOW when no signal.
+#define PIN_RF_RX_DATA D3        // On this input, the 433Mhz-RF signal is received. LOW when no signal.
 #define PIN_RF_TX_PMOS NOT_A_PIN // High Side P-MOSFET, active on LOW level
 #define PIN_RF_TX_NMOS D6        // Low Side N-MOSFET, active on HIGH level
 #define PIN_RF_TX_VCC NOT_A_PIN  // +5 volt / Vcc power to the transmitter on this pin

RFLink/RFLink.ino

@@ -128,17 +128,19 @@ void sendMsg()
 void enableRX()
 {
   // RX pins
-  pinMode(PIN_RF_RX_NA, INPUT);          // Initialise in/output ports
-  pinMode(PIN_RF_RX_DATA, INPUT);        // Initialise in/output ports
-  pinMode(PIN_RF_RX_NMOS, OUTPUT);       // MOSFET, always output
-  pinMode(PIN_RF_RX_PMOS, OUTPUT);       // MOSFET, always output
-  digitalWrite(PIN_RF_RX_NMOS, HIGH);    // turn GND to RF receiver ON
-  digitalWrite(PIN_RF_RX_PMOS, LOW);     // turn VCC to RF receiver ON
-  pinMode(PIN_RF_RX_GND, OUTPUT);        // Initialise in/output ports
-  pinMode(PIN_RF_RX_VCC, OUTPUT);        // Initialise in/output ports
-  digitalWrite(PIN_RF_RX_GND, LOW);      // turn GND to RF receiver ON
-  digitalWrite(PIN_RF_RX_VCC, HIGH);     // turn VCC to RF receiver ON
+  pinMode(PIN_RF_RX_NA, INPUT);       // Initialise in/output ports
+  pinMode(PIN_RF_RX_DATA, INPUT);     // Initialise in/output ports
+  pinMode(PIN_RF_RX_NMOS, OUTPUT);    // MOSFET, always output
+  pinMode(PIN_RF_RX_PMOS, OUTPUT);    // MOSFET, always output
+  digitalWrite(PIN_RF_RX_NMOS, HIGH); // turn GND to RF receiver ON
+  digitalWrite(PIN_RF_RX_PMOS, LOW);  // turn VCC to RF receiver ON
+  pinMode(PIN_RF_RX_GND, OUTPUT);     // Initialise in/output ports
+  pinMode(PIN_RF_RX_VCC, OUTPUT);     // Initialise in/output ports
+  digitalWrite(PIN_RF_RX_GND, LOW);   // turn GND to RF receiver ON
+  digitalWrite(PIN_RF_RX_VCC, HIGH);  // turn VCC to RF receiver ON
+#ifdef PULLUP_RF_TX_DATA
   pinMode(PIN_RF_RX_DATA, INPUT_PULLUP); // Initialise in/output ports
+#endif
   delayMicroseconds(TRANSMITTER_STABLE_DELAY_US);
 }
 
@@ -158,7 +160,7 @@ void disableRX()
 void enableTX()
 {
   // TX Pins
-  pinMode(PIN_RF_TX_DATA, OUTPUT); // Initialise in/output ports
+  pinMode(PIN_RF_TX_DATA, OUTPUT);    // Initialise in/output ports
   digitalWrite(PIN_RF_TX_DATA, LOW);  // No signal yet
   pinMode(PIN_RF_TX_NMOS, OUTPUT);    // MOSFET, always output
   pinMode(PIN_RF_TX_PMOS, OUTPUT);    // MOSFET, always output