c_str() to convert it to a NUL-terminated char* which can be printed directly: Serial.println(str. Chapter 1 described how to connect the Arduino serial port to your computer to upload sketches. This chapter explains how to send and receive information using this capability. ![]() Size_t println(const _FlashStringHelper note: no known conversion for argument 1 from 'std::_cxx11::string' to 'const note: candidate: 'size_t Print::println(const String&)' Serial communications provide an easy and flexible way for your Arduino board to interact with your computer and other devices. In file included from note: candidate: 'size_t Print::println(const _FlashStringHelper*)' Src/main.cpp:122:22: error: no matching function for call to 'HardwareSerial::println(std::_cxx11::string&)' You can’t directly print it – trying to do so leads to the following error messages: src/main.cpp: In function 'void setup()': So, you can determine whether a given (lat, lon) point is within a rectangular or circular region with a single, well chosen if statement.In Arduino, if you have a std::string: std::string str = "test" The coordinates are stored by TinyGPS++ as long integers, in decimal degrees*10^7. I saw it in the library explanation file, I'll check it tomorrow. 6 DP are responsible for 40m accuracy Nice info - raw lat,long. But this way requires the lat/long to be stored as float/double. Maybe I should compare lat/long with a string with 4 or 5 DPs, so that there is an acceptable error margin if (abs(currentLat - pointLat) <= 0.0001) How do I convert the parts after the 2nd and 4th comma ? Serial.print ('L ') // String Serial.println (Var) // Print Variable on same line then send a line feed. readStringUntil(), but it is a String object. It's not hard to get the relevant $GPGGA string using. In case I leave it as a string, how will I compare the lat/long strings with other coordinates, meaning - it's going to be easy to compare the lat/long string with a certan point (x,y coordinates) on the map, but what If I want to make a statement like: Thanks - "why not leave them as strings ?" Summa Sumarum - how do I save the latitude/longitude number that the method spits, and compare it to some other value ? double latitudeData = ((), 6) - this variable will be 06.00 instead of 20.123456 :/ I tried saving it a a double, but the saved number is = 06.00 :o How do I store a number with so many decimal places ? Number 6 is the number of decimal places, that number can be changed. format: specifies the number base (for integral data types) or number of decimal places (for floating point types) So the solution: specift 7 decimal places when you print: Serial. Serial.println((), 6) // Latitude in degrees (double) Serial.println(val) Serial.println(val, format) Parameters. val: the value you assign to that variable. ![]() Syntax unsigned long var val Parameters var: variable name. Unlike standard longs unsigned longs won’t store negative numbers, making their range from 0 to 4,294,967,295 (232 - 1). The code below is from the library explanation file : Description Unsigned long variables are extended size variables for number storage, and store 32 bits (4 bytes). Serial.print((), 6) and I get something like 20.915727 which is correct. for example if i set my total points to 2000, which means at a sampling rate of 200 Hz. however when i setup into arduino and use serial.print to print out, it always shows dealy. ![]() Here comes the problem - I want to store that data, so that I can compare it with the corner points of the square. i am trying to read an analog value from a source and sample it around 200 Hz which means i want generate 200 points every second. When printed, it's tells me the latitude, with 6 decimal points precision. ![]() I'm using the TinyGPS++.h library, and this is the important method/function: The code shouldn't be tricky, but I'm already stuck. The idea is simple - a LED should turn on in case the gps module is in a predefined square on the map. I'm working on a project that is centered around a GPS NEO 6 Module. How do you zero pad an integer in the Arduino IDE Say X can be 0 to 100, and I want to display X as a 3 digit number i.e.
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