Add files via upload

XCTRACK_VARIO_FTDI_MS5611.ino

@@ -0,0 +1,99 @@
+/*
+VARIO XCTRACK
+arduino nano with ftdi chip, all other chip will not work
+sensor ms5611
+damien varrel 09/2018 
+
+Based on Arduino Vario by Benjamin PERRIN 2017 / Vari'Up
+Based on Arduino Vario by Jaros, 2012 and vario DFelix 2013
+
+https://github.com/LK8000/LK8000/blob/master/Docs/LK8EX1.txt
+
+$LK8EX1,pressure,altitude,vario,temperature,battery,*checksum
+
+Field 0, raw pressure in hPascal:
+  hPA*100 (example for 1013.25 becomes  101325) 
+  no padding (987.25 becomes 98725, NOT 098725)
+  If no pressure available, send 999999 (6 times 9)
+  If pressure is available, field 1 altitude will be ignored
+
+Field 1, altitude in meters, relative to QNH 1013.25
+  If raw pressure is available, this value will be IGNORED (you can set it to 99999
+  but not really needed)!
+  (if you want to use this value, set raw pressure to 999999)
+  This value is relative to sea level (QNE). We are assuming that
+  currently at 0m altitude pressure is standard 1013.25.
+  If you cannot send raw altitude, then send what you have but then
+  you must NOT adjust it from Basic Setting in LK.
+  Altitude can be negative
+  If altitude not available, and Pressure not available, set Altitude
+  to 99999  (5 times 9)
+  LK will say "Baro altitude available" if one of fields 0 and 1 is available.
+
+Field 2, vario in cm/s
+  If vario not available, send 9999  (4 times 9)
+  Value can also be negative
+
+Field 3, temperature in C , can be also negative
+  If not available, send 99
+
+Field 4, battery voltage or charge percentage
+  Cannot be negative
+  If not available, send 999 (3 times 9)
+  Voltage is sent as float value like: 0.1 1.4 2.3  11.2 
+  To send percentage, add 1000. Example 0% = 1000
+  14% = 1014 .  Do not send float values for percentages.
+Percentage should be 0 to 100, with no decimals, added by 1000!
+*/
+
+#include <MS5611.h>
+#include <avr/wdt.h>
+/////////////////////////////////////////
+MS5611 sensor(&Wire);
+#define UART_SPEED 115200
+
+uint32_t get_time = millis();
+const char compile_date[] = "XCTRACK VARIO ver " __DATE__;
+
+void setup() {
+  wdt_disable();
+  Serial.begin(UART_SPEED);       // set up arduino serial port
+  Serial.println(compile_date);
+  Serial.println("checking MS5611 sensor...");
+  wdt_enable(WDTO_1S); //enable the watchdog 1s without reset
+  if (sensor.connect()>0) {  
+    Serial.println("Error connecting MS5611...");
+    Serial.println("reset in 1s...");
+    delay(1200); //for watchdog timeout
+  }
+}
+
+void loop(void) {
+  wdt_reset();
+  sensor.ReadProm();
+  sensor.Readout();
+  uint32_t Pressure=round(sensor.GetPres());
+  if (millis() >= (get_time + 333)) //every 0.33 second send NMEA output over serial port
+  {
+    get_time = millis();
+
+    //$LK8EX1,pressure,altitude,vario,temperature,battery,*checksum
+    //$LK8EX1,pressure,99999,9999,99,999,*checksum
+    String str_out = String("LK8EX1,")
+    +String(Pressure)
+    +String(",99999,9999,99,999,");
+  
+    unsigned int checksum_end, ai, bi;                                               // Calculating checksum for data string
+    for (checksum_end = 0, ai = 0; ai < str_out.length(); ai++)
+    {
+      bi = (unsigned char)str_out[ai];
+      checksum_end ^= bi;
+    }
+
+    Serial.print("$");       
+    Serial.print(str_out);
+    Serial.print("*");
+    Serial.println(checksum_end, HEX);
+  }
+}
+