Initial commit

lib/NexusTX/NexusTX.cpp

@@ -0,0 +1,101 @@
+#include "NexusTX.h"
+
+NexusTX::NexusTX(byte tr_pin)
+{
+  SendBuffer = new bool[buffer_size];
+  TX_PIN = tr_pin;
+  pinMode(TX_PIN, OUTPUT);
+  digitalWrite(TX_PIN, LOW);
+  SendBuffer[9] = 0;
+    SendBuffer[24] = 1;
+    SendBuffer[25] = 1;
+    SendBuffer[26] = 1;
+    SendBuffer[27] = 1;
+
+}
+
+
+void NexusTX::tx_bit(bool b)
+{
+  digitalWrite(TX_PIN, HIGH);
+  delayMicroseconds(PULSE_HIGH);
+  digitalWrite(TX_PIN, LOW);
+  if (b == true)
+    delayMicroseconds(PULSE_ONE);
+  else
+    delayMicroseconds(PULSE_ZERO);
+}
+
+void NexusTX::setBatteryFlag(bool level)
+{
+  SendBuffer[8] = level;
+}
+
+void NexusTX::setHumidity(int h)
+{
+uint8_t h8 = (uint8_t)h;
+for (idx = 0; idx <= 7; idx++)
+{
+    SendBuffer[35 - idx] = (h8 >> idx) & 0x1;
+}
+
+}
+
+void NexusTX::setChannel(byte dev_ch)
+{
+  SendBuffer[10] = dev_ch & 0x2;
+  SendBuffer[11] = dev_ch & 0x1;
+}  
+
+void NexusTX::setId(byte dev_id)
+{
+    int array_idx = 0;
+    for (idx = 7; idx >= 0; idx--)
+    {
+        SendBuffer[array_idx++] = dev_id & (0x1 << idx);
+    }
+}
+
+void NexusTX::setTemperature(float t)
+{
+int16_t t12 = t * 10.0f;
+for (idx = 0; idx <= 11; idx++)
+{
+    SendBuffer[23 - idx] = (t12 >> idx) & 0x1;
+}
+}
+
+void NexusTX::SendNexus()
+{
+    for (int i=0; i <buffer_size; i++)
+    {
+        tx_bit(SendBuffer[i]);
+    }
+}
+
+void NexusTX::SendPacket()
+{
+  for (idx = 1; idx < repeat; idx++)
+  {
+    SendNexus();
+    if (idx + 1 == repeat) {break;} // do not send sync after last TX
+    // sync bit
+    digitalWrite(TX_PIN, HIGH);
+    delayMicroseconds(PULSE_HIGH);
+    digitalWrite(TX_PIN, LOW);
+    delayMicroseconds(PULSE_SYNC);
+  }
+}
+
+
+bool NexusTX::transmit()
+{
+  if (millis() >= time_marker_send && send_time)
+  {
+    time_marker_send = millis() + send_time;
+    SendPacket();
+    return true;
+  }
+  else return false;
+}
+

lib/NexusTX/NexusTX.h

@@ -0,0 +1,46 @@
+#include <Arduino.h>
+#ifndef NexusTX_h
+#define NexusTX_h
+
+#define PULSE_HIGH 500  /* 500 us */
+#define PULSE_ZERO 1000  /* 1000 us */
+#define PULSE_ONE 2000  /* 2000 us */
+#define PULSE_SYNC 4000 /* 4000 us */
+
+// Time between two TX = 56.75 seconds
+#define TX_INTERVAL 56750
+
+// Bitstream repetition (this device sends the information 10 times)
+#define repeat 12
+
+
+
+class NexusTX
+{
+  public:
+
+    bool* SendBuffer;
+    int buffer_size=36;
+    int tx_interval = TX_INTERVAL;
+    NexusTX(byte);
+    void setChannel(byte);
+    void setId(byte);
+    void setBatteryFlag(bool);
+    void setTemperature(float);
+    void setHumidity(int);
+    bool transmit();
+    void SendPacket();
+    
+
+  private:
+  void tx_bit(bool);
+  byte TX_PIN;
+  int idx = 0;
+  void SendNexus();
+  unsigned long time_marker_send = 0;
+  unsigned long send_time = TX_INTERVAL;
+
+};
+
+#endif
+