├── .gitignore ├── SimpleBTVario_bb.png ├── README.md ├── SimpleBTVario └── SimpleBTVario.ino └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | .vscode/ 2 | -------------------------------------------------------------------------------- /SimpleBTVario_bb.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/spasutto/SimpleBTVario/HEAD/SimpleBTVario_bb.png -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SimpleBTVario 2 | Simple Bluetooth Vario (Arduino + MS5611 barometric pressure sensor) with LK8000/LXNAV bluetooth sentences 3 | 4 | Forked from Vario by D.Felix (https://codebender.cc/sketch:34645#Vario.ino) 5 | 6 | 7 | 8 | ## Differences from original: 9 | + Use of MS5611 sensor instead of BMP085 10 | + Use of a button to set to sleep/awake the µP 11 | + Use of the native arduino tone functions (compatibility with ARM Cortex M0) 12 | + Support LXNAV sentences (now work for XC Soar along with LK8000 for XC Track) 13 | + Support simple NMEA-like sentences from user (useable with any Android bluetooth terminal app) : 14 | + "$ALTI=400" : set current altitude to 400m (pressure compensation) 15 | + "$BTMODE=LXNAV" : set bluetooth sentences to LXNAV or LK8000 16 | + "$RESET" : reset the conf to default values 17 | 18 | ## Schematic / BOM 19 | + Arduino Pro Mini **3.3V** 20 | + MS5611 21 | + HC-06/05 (not needed if used as a simple audio vario or if using a USB-capable arduino, then you can plug directly in the smartphone and drop also the LIPO/charger) 22 | + switch, either ; 23 | + spdt if connected between battery charger and arduino 24 | + push button if connected to D2 (set µP in sleep mode) 25 | + piezo buzzer 26 | + Lipo Battery 27 | + Optional : USB LiPo battery charger 28 | ![Schema](SimpleBTVario_bb.png#4) 29 | 30 | ## Programming/assembly instructions ## 31 | 32 | *Prerequisite* : you must download and install MS5611 library here : https://github.com/jarzebski/Arduino-MS5611 33 | 34 | First, use a 3.3V Arduino Pro Mini, because the 3.7V battery is connected directly to the VCC and the atmega328p is not designed to run @16MHz with Vcc around 3.3V. The battery (or battery charger output) must be connected to VCC and not RAW or the battery level will be wrong. 35 | 36 | To measure properly the battery voltage, you must determine the real voltage of the 1.1V internal reference voltage (ref [Nick Gammon site](https://www.gammon.com.au/adc)). So first upload this simple code to the arduino : 37 | 38 | void setup () 39 | { 40 | ADMUX = bit (REFS0) | bit (REFS1); // Internal 1.1V reference 41 | } 42 | void loop () { } 43 | 44 | And then, with the help of a multimeter, measure the voltage at Aref pin (18 on pro mini), it should be ~1.1V. Finally, update the value of the constant variable named "InternalReferenceVoltage" in the sketch SimpleBTVario.ino and upload it, you're done with the programming part!!! 45 | 46 | ### Low power enhancement ### 47 | You can remove the regulator and the led because they use power, and also the built-in led. Similarly you can remove the leds on the HC-05/6 and MS5611. 48 | -------------------------------------------------------------------------------- /SimpleBTVario/SimpleBTVario.ino: -------------------------------------------------------------------------------- 1 | /* 2 | * 3 | SimpleBTVario by Sylvain Pasutto 2018 distributed under GNU General Public License 4 | 5 | Forked from : 6 | 7 | Arduino Vario by dfelix 2013 8 | 9 | This program is free software; you can redistribute it and/or modify 10 | it under the terms of the GNU General Public License as published by 11 | the Free Software Foundation; either version 2 of the License, or 12 | (at your option) any later version. 13 | This program is distributed in the hope that it will be useful, 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 | GNU General Public License for more details. 17 | You should have received a copy of the GNU General Public License 18 | along with this program; if not, write to the Free Software 19 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 20 | 21 | 22 | LK8000 integration based on Arduino Vario by Jaros, 2012 23 | Arduino board creates NMEA like protocol with variometer output and beping sound. 24 | LK8000 EXTERNAL INSTRUMENT SERIES 1 - NMEA SENTENCE: LK8EX1 25 | VERSION A, 110217 26 | 27 | $LK8EX1,pressure,altitude,vario,temperature,battery,*checksum 28 | 29 | Field 0, raw pressure in hPascal:hPA*100 (example for 1013.25 becomes 101325) 30 | no padding (987.25 becomes 98725, NOT 098725) 31 | If no pressure available, send 999999 (6 times 9) 32 | If pressure is available, field 1 altitude will be ignored 33 | Field 1, altitude in meters, relative to QNH 1013.25 34 | If raw pressure is available, this value will be IGNORED (you can set it to 99999 35 | but not really needed)!(if you want to use this value, set raw pressure to 999999) 36 | This value is relative to sea level (QNE). We are assuming that currently at 0m 37 | altitude pressure is standard 1013.25.If you cannot send raw altitude, then send 38 | what you have but then you must NOT adjust it from Basic Setting in LK. 39 | Altitude can be negative. If altitude not available, and Pressure not available, set Altitude 40 | to 99999. LK will say "Baro altitude available" if one of fields 0 and 1 is available. 41 | Field 2, vario in cm/s 42 | If vario not available, send 9999. Value can also be negative. 43 | Field 3, temperature in C , can be also negative.If not available, send 99 44 | Field 4, battery voltage or charge percentage.Cannot be negative.If not available, send 999. 45 | Voltage is sent as float value like: 0.1 1.4 2.3 11.2. To send percentage, add 1000. 46 | Example 0% = 1000. 14% = 1014 . Do not send float values for percentages. 47 | Percentage should be 0 to 100, with no decimals, added by 1000! 48 | 49 | Credits: 50 | (1) https://github.com/jarzebski/Arduino-MS5611 //MS5611 library 51 | (2) http://mbed.org/users/tkreyche/notebook/bmp085-pressure-sensor/ //more about bmp085 and average filter 52 | (3) http://code.google.com/p/rogue-code/ //helpfull tone library to make nice beeping without using delay 53 | (4) http://www.daqq.eu/index.php?show=prj_sanity_nullifier //how to make loud piezo speaker 54 | (5) http://lk8000.it //everything because of that 55 | (6) http://taturno.com/2011/10/30/variometro-la-rivincita/ //huge thanks for Vario algorithm 56 | (7) http://code.google.com/p/tinkerit/wiki/SecretVoltmeter //how to measure battery level using AVR ucontroller 57 | */ 58 | 59 | #include 60 | #include //i2c library 61 | #include //MS5611 library, download from url link (1) 62 | #if defined(ARDUINO_SAMD_ZERO) 63 | #include //we need that to use dtostrf() and convert float to string 64 | #else 65 | #include //we need that to use dtostrf() and convert float to string 66 | #include 67 | #endif 68 | 69 | #define xstr(a) str(a) 70 | #define str(a) #a 71 | 72 | ///////////////////////////////////////// 73 | ///////////////////////////////////////// variables that You can test and try 74 | short speaker_pin = 8; //arduino speaker output 75 | short button_pin = 2; //power off button 76 | #define VARIO_VERSION 1.0 77 | #define SAMPLES_ARR 6 //define moving average filter array size (2->30), more means vario is less sensitive and slower 78 | #define UART_SPEED 9600 //define serial transmision speed (9600,19200, etc...) 79 | //#define BLINK_LED //if we blink led at battery reading 80 | #define PERIOD_NMEA 333 //period for sending LK8000 sentences 81 | #define PERIOD_BAT 1000 //period for checking battery level 82 | #define VBATPIN A7 //M0 VBat reading pin 83 | ///////////////////////////////////////// 84 | ///////////////////////////////////////// 85 | //BMP085 bmp085 = BMP085(); //set up bmp085 sensor 86 | MS5611 ms5611; 87 | double Temperature = 0.0f; 88 | long Pressure = 101325; 89 | float Altitude; 90 | unsigned long average_pressure; 91 | int Battery_Vcc = 0; //variable to hold the value of Vcc from battery 92 | const float P0 = 101325; //Pressure at sea level (Pa) 93 | const float InternalReferenceVoltage = 1.103; // as measured on my 3.3V arduino 94 | //unsigned long get_time1 = millis(); 95 | unsigned long get_time2 = millis() + PERIOD_BAT; 96 | unsigned long get_time3 = millis() + PERIOD_NMEA; 97 | #ifdef BLINK_LED 98 | boolean light_on = false; 99 | #endif 100 | boolean thermalling = false; 101 | int my_temperature = 1; 102 | char altitude_arr[6]; //wee need this array to translate float to string 103 | char vario_arr[5]; //wee need this array to translate float to string 104 | int samples = 40; 105 | int maxsamples = 50; 106 | float alt[51]; 107 | float tim[51]; 108 | float beep; 109 | float Beep_period; 110 | float tempo; 111 | float vario; 112 | float N1; 113 | float N2; 114 | float N3; 115 | float D1; 116 | float D2; 117 | static unsigned long k[SAMPLES_ARR]; 118 | static unsigned long battper[SAMPLES_ARR]; 119 | char serrecv, serbuff[32], *serptr = (serbuff + sizeof(serbuff)); 120 | int buttonState = LOW, lastButtonState = LOW; // variable for reading the pushbutton status 121 | unsigned long lastDebounceTime = 0; // the last time the output pin was toggled 122 | unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers 123 | 124 | enum TYPE_BT_SENTENCES 125 | { 126 | LK8000, 127 | LXNAV 128 | }; 129 | typedef struct 130 | { 131 | char signature[11] = "BTVARIO" xstr(VARIO_VERSION); 132 | float p0 = 101325; //Pressure at sea level (Pa) 133 | TYPE_BT_SENTENCES type_sentences = TYPE_BT_SENTENCES::LK8000; 134 | float vario_climb_rate_start = 0.4; //minimum climb beeping value(ex. start climbing beeping at 0.4m/s) 135 | float vario_sink_rate_start = -200.0; //maximum sink beeping value (ex. start sink beep at -1.1m/s) 136 | } SETTINGS; 137 | SETTINGS settings; 138 | 139 | bool debounce(int pin, int *state, int *laststate, byte aimstate = HIGH); 140 | 141 | template unsigned long Averaging_Filter(unsigned long* values, T input) // moving average filter function 142 | { 143 | unsigned long sum = 0; 144 | for (int i = 0; i < SAMPLES_ARR; i++) 145 | { 146 | values[i] = values[i + 1]; 147 | } 148 | values[SAMPLES_ARR - 1] = input; 149 | for (int i = 0; i < SAMPLES_ARR; i++) 150 | { 151 | sum += values[i]; 152 | } 153 | return ( sum / SAMPLES_ARR ) ; 154 | } 155 | 156 | void play_melody(bool intro = true) //play welcome beep after turning on arduino vario 157 | { 158 | if (intro) 159 | { 160 | for (int aa = 300; aa <= 1500; aa = aa + 100) 161 | { 162 | tone(speaker_pin, aa, 20); // play beep on pin 8 (note,duration) 163 | delay(10); 164 | } 165 | } 166 | for (int aa = 1500; aa >= 100; aa = aa - 100) 167 | { 168 | tone(speaker_pin, aa, 20); // play beep on pin 8 (note,duration) 169 | delay(10); 170 | } 171 | } 172 | 173 | float readVcc() // function to read battery value 174 | { 175 | #if defined(ARDUINO_SAMD_ZERO) 176 | float measuredvbat = analogRead(VBATPIN); 177 | measuredvbat *= 2; // we divided by 2, so multiply back 178 | measuredvbat *= 3.3f; // Multiply by 3.3V, our reference voltage 179 | measuredvbat /= 1024; // convert to V 180 | //Serial.print("VBat: " ); Serial.print(measuredvbat); Serial.println(" V"); 181 | #else 182 | ADCSRA = bit (ADEN); // turn ADC on 183 | ADCSRA |= bit (ADPS0) | bit (ADPS1) | bit (ADPS2); // Prescaler of 128 184 | ADMUX = bit (REFS0) | bit (MUX3) | bit (MUX2) | bit (MUX1); 185 | 186 | delay (10); // let it stabilize 187 | 188 | bitSet (ADCSRA, ADSC); // start a conversion 189 | while (bit_is_set(ADCSRA, ADSC)); 190 | 191 | return InternalReferenceVoltage / float (ADC + 0.5f) * 1024.0f; 192 | #endif 193 | } 194 | 195 | #if !defined(ARDUINO_SAMD_ZERO) 196 | bool awakening = true; 197 | void goToSleep() // sleep µP if pin 2 turn from LOW to HIGH 198 | { 199 | byte adcsra, mcucr1, mcucr2; 200 | play_melody(false); 201 | delay(250); 202 | makePinsInput(); 203 | sleep_enable(); 204 | set_sleep_mode(SLEEP_MODE_PWR_DOWN); 205 | EIMSK = _BV(INT0); //enable INT0 206 | adcsra = ADCSRA; //save the ADC Control and Status Register A 207 | ADCSRA = 0; //disable ADC 208 | cli(); 209 | mcucr1 = MCUCR | _BV(BODS) | _BV(BODSE); //turn off the brown-out detector 210 | mcucr2 = mcucr1 & ~_BV(BODSE); 211 | MCUCR = mcucr1; //timed sequence 212 | MCUCR = mcucr2; //BODS stays active for 3 cycles, sleep instruction must be executed while it's active 213 | sei(); //ensure interrupts enabled so we can wake up again 214 | sleep_cpu(); //go to sleep 215 | sleep_disable(); //wake up here 216 | ADCSRA = adcsra; //restore ADCSRA 217 | makePinsInput(); 218 | play_melody(true); 219 | } 220 | 221 | ISR(INT0_vect) // wake up interrupt 222 | { 223 | EIMSK = 0; //disable interrupts (only need one to wake up) 224 | awakening = true; 225 | } 226 | 227 | void makePinsInput(void) //make all pins input pins with pullup resistors to minimize power consumption 228 | { 229 | for (byte i=0; i<20; i++) { 230 | pinMode(i, INPUT_PULLUP); 231 | } 232 | //#ifdef BLINK_LED // if the led isn't removed from the pcb, it is lit but dimmed by the internal pull up resistor 233 | pinMode(LED_BUILTIN, OUTPUT); //except the LED pin 234 | digitalWrite(LED_BUILTIN, LOW); 235 | //#endif 236 | } 237 | #endif // !defined(ARDUINO_SAMD_ZERO) 238 | 239 | double getPressure(double altitude, double sealevelpressure) // calculate pressure from given altitude and pressure at sea level 240 | { 241 | return sealevelpressure * pow(1-altitude/44330.0f, 1.0f/0.1902949f); 242 | } 243 | 244 | void ParseCommand() // parse simple NMEA-like commands 245 | { 246 | serrecv = Serial.read(); 247 | // reinit serbuff/serptr 248 | if (serptr >= (serbuff + sizeof(serbuff))) 249 | { 250 | serptr = &serbuff[sizeof(serbuff)]; 251 | do 252 | *(--serptr) = 0; 253 | while (serptr > serbuff); 254 | if (serrecv == 0x0D || serrecv == 0x0A) 255 | return; 256 | } 257 | switch (serrecv) 258 | { 259 | case 0x0D: 260 | case 0x0A: 261 | if (strncmp(serbuff, "$HELP", 5) == 0) 262 | { 263 | Serial.println(F("\"$RESET\" : reset all settings")); 264 | Serial.println(F("\"$ALTI=450\" : set the current altitude to 450m")); 265 | Serial.println(F("\"$BTMODE=LXNAV\" : set the bluetooth sentences to LXNAV mode")); 266 | Serial.println(F(" Supported values :")); 267 | Serial.println(F(" - LXNAV")); 268 | Serial.println(F(" - LK8000")); 269 | Serial.println(F("\"$VTMIN=-1.1\" : set the vario sink treshold")); 270 | Serial.println(F("\"$VTMAX=0.4\" : set the vario climb treshold")); 271 | } 272 | else if (strncmp(serbuff, "$RESET", 6) == 0) 273 | { 274 | settings.type_sentences = TYPE_BT_SENTENCES::LK8000; 275 | settings.p0 = P0; 276 | saveConf(); 277 | } 278 | else if (strncmp(serbuff, "$ALTI=", 6) == 0) 279 | { 280 | settings.p0 = ms5611.getSeaLevel(ms5611.readPressure(true), (float)atoi(serbuff + 6)); 281 | saveConf(); 282 | } 283 | else if (strncmp(serbuff, "$VTMIN=", 7) == 0) 284 | { 285 | settings.vario_sink_rate_start = (float)atof(serbuff + 7); 286 | saveConf(); 287 | } 288 | else if (strncmp(serbuff, "$VTMAX=", 7) == 0) 289 | { 290 | settings.vario_climb_rate_start = (float)atof(serbuff + 7); 291 | saveConf(); 292 | } 293 | else if (strncmp(serbuff, "$BTMODE=", 8) == 0) 294 | { 295 | if (strncmp(serbuff + 8, "LK8000", 6) == 0) 296 | { 297 | settings.type_sentences = TYPE_BT_SENTENCES::LK8000; 298 | saveConf(); 299 | } 300 | else if (strncmp(serbuff + 8, "LXNAV", 5) == 0) 301 | { 302 | settings.type_sentences = TYPE_BT_SENTENCES::LXNAV; 303 | saveConf(); 304 | } 305 | } 306 | serptr = (serbuff + sizeof(serbuff)); // reinit à la prochain iteration 307 | break; 308 | case '$': 309 | serptr = serbuff; 310 | default: 311 | *(serptr++) = serrecv; 312 | break; 313 | } 314 | } 315 | 316 | bool debounce(int pin, int *state, int *laststate, byte aimstate = HIGH) // debounce button input 317 | { 318 | bool result = false; 319 | int reading = digitalRead(pin); 320 | if (reading != *laststate) { 321 | // reset the debouncing timer 322 | lastDebounceTime = millis(); 323 | } 324 | if ((millis() - lastDebounceTime) > debounceDelay) { 325 | // whatever the reading is at, it's been there for longer than the debounce 326 | // delay, so take it as the actual current state: 327 | 328 | // if the button state has changed: 329 | if (reading != *state) { 330 | *state = reading; 331 | 332 | if (*state == aimstate) 333 | result = true; 334 | } 335 | } 336 | *laststate = reading; 337 | return result; 338 | } 339 | 340 | void saveConf() // save conf in EEPROM 341 | { 342 | EEPROM.put(0, settings); 343 | play_melody(false); 344 | } 345 | 346 | void loadConf() // read conf from EEPROM 347 | { 348 | for (int i=0; i Beep_period) // make some beep 416 | { 417 | beep = tempo; 418 | 419 | if ((vario < 0 ) && (thermalling == true)) //looks like we jump out the thermall 420 | { 421 | //Beep_period=1000; 422 | //tone(speaker_pin,50, 500); //oo, we lost thermall play alarm 423 | thermalling = false; 424 | } 425 | else if ((vario > settings.vario_climb_rate_start || vario < settings.vario_sink_rate_start) && vario < 15 ) 426 | { 427 | thermalling = true; 428 | Beep_period = min(1000, 350 - (vario * 5)); 429 | tone(speaker_pin, max(100, (1000 + (100 * vario))), min(1000, 300 - (vario * 5))); //when climbing make faster and shorter beeps 430 | } 431 | // stationnary sinking sound 432 | /*else if (vario < settings.vario_sink_rate_start && vario > -10) 433 | { 434 | thermalling = false; 435 | Beep_period = 200; 436 | tone(speaker_pin, 300, 340); 437 | }*/ 438 | } 439 | 440 | if (millis() >= get_time2) //every second get temperature and battery level 441 | { 442 | Temperature = ms5611.readTemperature(); // get temperature in celsius from time to time, we have to divide that by 10 to get XY.Z 443 | my_temperature = Temperature; 444 | Battery_Vcc = min(1100, 1000 + max(0, Averaging_Filter(battper, (readVcc() - 3.6f) / 0.006f))); // get voltage and prepare in percentage (3.6V => 0%, 4.2V => 100%) 445 | get_time2 = millis() + PERIOD_BAT; 446 | #ifdef BLINK_LED 447 | // blink the led 448 | light_on = !light_on; 449 | digitalWrite(LED_BUILTIN, light_on ? HIGH : LOW); 450 | #endif 451 | } 452 | 453 | if (millis() >= get_time3) //every 1/3 second send NMEA output over serial port 454 | { 455 | String str_out; 456 | if (settings.type_sentences == TYPE_BT_SENTENCES::LXNAV) 457 | { 458 | //creating now NMEA serial output for LXNAV. LXWP0 sentence format: 459 | //$LXWP0,logger_stored, airspeed, airaltitude,v1[0],v1[1],v1[2],v1[3],v1[4],v1[5], hdg, windspeed*CS 460 | // 0 loger_stored : [Y|N] (not used in LX1600) 461 | // 1 IAS [km/h] ----> Condor uses TAS! 462 | // 2 baroaltitude [m] 463 | // 3-8 vario values [m/s] (last 6 measurements in last second) 464 | // 9 heading of plane (not used in LX1600) 465 | // 10 windcourse [deg] (not used in LX1600) 466 | // 11 windspeed [km/h] (not used in LX1600) 467 | // $LXWP0,Y,222.3,1665.5,1.71,,,,,,239,174,10.1 468 | str_out = String("LXWP0" + String(",Y,,") + String(dtostrf(Altitude, 0, 0, altitude_arr)) + String(",") 469 | + String(dtostrf((vario), 0, 3, vario_arr)) + String(",,,,,,,,")); 470 | } 471 | else 472 | { 473 | //creating now NMEA serial output for LK8000. LK8EX1 protocol format: 474 | //$LK8EX1,pressure,altitude,vario,temperature,battery,*checksum 475 | str_out = String("LK8EX1" + String(",") + String(average_pressure, DEC) + String(",") + String(dtostrf(Altitude, 0, 0, altitude_arr)) + String(",") + 476 | String(dtostrf((vario * 100), 0, 0, vario_arr)) + String(",") + String(my_temperature, DEC) + String(",") + String(Battery_Vcc, DEC) + String(",")); 477 | } 478 | unsigned int checksum_end, ai, bi; // Calculating checksum for data string 479 | for (checksum_end = 0, ai = 0; ai < str_out.length(); ai++) 480 | { 481 | bi = (unsigned char)str_out[ai]; 482 | checksum_end ^= bi; 483 | } 484 | Serial.print("$"); //print first sign of NMEA protocol 485 | Serial.print(str_out); // print data string 486 | Serial.print("*"); //end of protocol string 487 | Serial.println(checksum_end, HEX); //print calculated checksum on the end of the string in HEX 488 | get_time3 = millis() + PERIOD_NMEA; 489 | } 490 | 491 | if (Serial.available()) 492 | ParseCommand(); //parse commands from user 493 | 494 | #if !defined(ARDUINO_SAMD_ZERO) 495 | // is button is released, power off the µc 496 | if (debounce(button_pin, &buttonState, &lastButtonState, HIGH)) 497 | { 498 | if (awakening) 499 | awakening = false; 500 | else 501 | goToSleep(); 502 | } 503 | #endif // !defined(ARDUINO_SAMD_ZERO) 504 | } 505 | //The End 506 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------