36
votes
How to read and write EEPROM in ESP8266
While EEPROM.read and EEPROM.write are valid methods, it's like mopping the floor with a toothbrush. Use EEPROM.put and EEPROM.get instead.
For example:
#include <EEPROM.h>
void setup()
{
...
- 461
25
votes
CLion + Arduino
Rather than using any plugin, I am using CLion with PlatformIO, which supports several IDEs. CLion then not only gives you code completion, but also full support for refactoring, Git, and much much ...
- 491
21
votes
Accepted
Split up Arduino code into multiple files using Arduino IDE
There is no need to use an #include directive for the additional .ino file.
Before compilation starts, the Arduino IDE concatenates all .ino files in your sketch into a single file, starting with the ....
- 4,048
18
votes
Accepted
Arduino IDE fails on Fedora with arduino-builder error "Parameter 'tools' is mandatory"
I don't understand why this worked, but I found this comment in Redhat Bugzilla (it doesn't seem to be a bug report specifically about that...but anyway):
Parameter 'tools' is mandatory
[.....
- 371
17
votes
Accepted
Only 2 decimal places in printed float
By default, the Serial print function shows only 2 decimals, however I'm sure the float has the full (unrounded) value, even if it does not show it.
You can read about it in the official ...
- 12.9k
15
votes
ESP8266, Arduino IDE vs Lua?
Lua, like many scripting languages, tends to make you a lot more
productive as a programmer: things become far easier as you work at a
higher abstraction level and do not worry about trivial things ...
- 42.2k
14
votes
Accepted
Which C++ standard does the Arduino language support?
The Arduino "language" is nothing more than a set of C++ functions and classes. It does not mandate any particular C++ standard.
The standard is dictated purely by the compiler that the core ...
- 105k
13
votes
Accepted
ESP8266, Arduino IDE vs Lua?
Using the Arduino IDE is custom firmware. That's what you're writing. You don't need any new firmware because the new firmware is what you are writing.
I can't think of any downsides to using C++ to ...
- 105k
13
votes
Arduino and fingerprint scanner - can I get the fingerprint scanner data?
I'm a software engineer that works with biometric sensors. The answer is, it will vary greatly depending on the scanner you've chosen. Some hardware solutions have built-in subject enrollment and ...
- 231
12
votes
Different ways (and the fastest) to compute sines (and cosines) in Arduino
The two basic methods are mathematical calculation (with polynomials) and lookup tables.
The Arduino's math library (libm, part of avr-libc) uses the former. It is optimised for the AVR in that it ...
- 105k
12
votes
Accepted
Linux can not open arduino IDE - java.lang.NullPointerException
I had to install arduino-avr-core package:
sudo pacman -S arduino-avr-core
Now it works fine
- 249
11
votes
Accepted
What is the relationship of an Arduino .ino file to main.cpp?
The Arduino uses the gcc compiler. That compiler wants a normal main function of course. Arduino has put a layer on top of that with setup and loop.
The hidden main function for basic Arduino boards ...
- 3,216
11
votes
Accepted
Confuse about PROGMEM and R"====()===="
why you should put your variables in flash memory instead of SRAM
Because the Arduino has only a very small amount of memory. If you have data that will never change it's better to store it in flash (...
- 105k
10
votes
Accepted
Difference between /dev/ttyACM0 and /dev/ttyS0 (Arduino IDE ports under Linux)
/dev/ttyACM0 is a USB communication device (CDC) of sub-type "abstract control model" (ACM). That is what the Arduino is.
/dev/ttyS0 is a hardware serial port - the (typically) 9-pin D connector on ...
- 105k
10
votes
CLion + Arduino
I know this was asked a long time ago, but maybe it will be useful for someone. I'm a beginner, regarding all this stuff, so if anybody knows a better way to do it, please correct me. here is how I ...
- 101
10
votes
How to determine Flash size?
Arduino's ESP8266 support includes an example sketch called CheckFlashConfig. This probes the board, and prints the flash memory size.
- 251
10
votes
Accepted
Programming Chinese Arduinos
It's because these are unprogrammed chips, meaning they haven't had a bootloader programmed into them yet. Here is a tutorial for using your Arduino board to program a bootloader into them (there are ...
- 15.1k
10
votes
Adding a custom board to the Arduino IDE
The simplest clean way to add your board using an existing core is to add the variant to your sketches folder's hardware subfolder. Only boards.txt and files for the board variant are added.
In your ...
- 17.8k
10
votes
Accepted
avrdude ser_open() can't set com-state
Maybe a Windows driver problem.
Do your uno and nano use a ch340? (It is the component translating USB to uart (serial pins of atmega328).
Windows has no software way to differenciate boards using ...
- 192
9
votes
Program an ATMega328P and use it without Arduino board
Yes you can use ATMega328P without arduino board. I always use the IC without arduino. There are two ways of doing it.
You can use arduino board with the IC. Program the IC and then take it out and ...
- 293
9
votes
Accepted
Can I use arduino's 3.3 V output directly to esp8266?
You should search for this data yourself, but since you are saying you are a newbie I'll tell you how to find this.
First of all you should search for a document called "datasheet". On a datasheet ...
- 2,721
9
votes
Accepted
How to setup OpenCV with Arduino?
If you are thinking of using OpenCV with a "normal" Arduino, such as the Uno or Mega, then think again. OpenCV runs on a computer - be that a desktop computer or an embedded computer. Basically you ...
- 105k
9
votes
Only 2 decimal places in printed float
By default, Serial.print() prints floats with two decimal digits.
float num = 7.875;
Serial.println(num, 4);
will print num with 4 decimal digits, thus: 7.8750.
The precision of float is not ...
- 375
9
votes
How to get the firmware (hex) file from a .ino file containing the code
You are asking how to locate the compiled hex file. It's easy! Follow these steps:
In the Arduino IDE select Sketch > Export Compiled Binary. This performs a compile. Once complete, this command ...
- 3,188
9
votes
Arduino IDE and subfolders
From Arduino IDE 1.6.10 onward the Arduino IDE compiles all source files in the src subfolder of the sketch and recursively through all folders under the src folder.
Support for compilation of sketch ...
- 4,048
9
votes
Arduino and fingerprint scanner - can I get the fingerprint scanner data?
There is a discussion thread on Quora discussing finger print scanners that provide raw output. The Quora author recommends a Futronic device which comes with an API for raw image collection. They ...
- 851
8
votes
Accepted
ESP8266 Analog read interferes with wifi?
I have found that this was caused by reading the analog pin to many times in a short period of time. I replaced
ldrState = map(analogRead(ldrPin), ldrMin, ldrMax, 0, 100);
Serial.println(...
- 183
8
votes
Accepted
Can I use Visual Studio instead of Arduino IDE?
I only use Visual Studio for Arduino programming.
Arduino Plugin for Visual Studio
- 204
8
votes
Accepted
Why can't the Atmel ATtiny family delay over a minute?
This is absolutely nothing to do with "why can't the atmel attiny family delay over a minute?". It is all to do with the way that C++ works.
See my page about Integer arithmetic and overflow.
To ...
- 37.9k
Only top scored, non community-wiki answers of a minimum length are eligible