76
votes
Arduino Nano uploading gives error: avrdude: stk500_recv(): programmer is not responding
Know this is old but I ran onto it during my search for Nano(V3)'s not uploading so thought might help someone else. Problem is the bootloader - Arduino IDE BUT I Found an easy solution (right under ...
- 761
9
votes
What's taking up so much RAM in an almost empty sketch?
I investigated this at some length a while back. On this page about putting constant data into program memory I obsessively tracked down every last byte of memory used in a small sketch. This was the ...
- 36.4k
8
votes
Accepted
How to read code from Arduino Uno to Arduino IDE?
Can we read and get C codes from compiled codes from Arduino hardwares?
While it is possible, even trivial, to disassemble machine code, it is very difficult to convert the assembly code into a ...
- 17.6k
8
votes
Loading local libraries
Okay, here is how it works, and I checked it to make sure.
Sure you can use hard paths, but every programmer hates using hard paths. They are not portable at all, and they lock your program in place. ...
- 91
8
votes
Accepted
ino.hex vs ino.with_bootloader.hex
If flashing with AVR In System Programing (ISP) the bootloader is not needed. Only the flashing over Serial needs a bootloader.
The ISP erases the flash including the bootloader. To be able to use ...
- 17.2k
7
votes
Double ## in macros
## is the concatenation operator in macros. It joins two macros or pieces of text together when expanded.
#define _SET_INPUT(IO) do {DIO ## IO ## _DDR &= ~MASK(DIO ## IO ## _PIN); } while (0)
...
- 104k
7
votes
Accepted
"stray '/302' in program error" when compiling
0302 is 0xc2. Somewhere in your source you have one or more non-breaking spaces (0xa0) encoded in UTF-8 (0xc2 0xa0). Use od or a similar tool to find them, and then replace them with normal spaces. ...
- 17.6k
7
votes
Accepted
Using Arduino as a standalone compiler
First of all: The Arduino IDE brings its own GCC compiler. It is a version, that can compile for the AVR platform (don't know, if the standard version is capable of that).
When you activate verbose ...
- 15.3k
6
votes
Is there any way to download a sketch from an Arduino?
Unless your objective is to simply copy the identical code to another device, the simple answer is: no
As has been pointed out in other answers, you can turn the hex code on the device back into ...
- 36.4k
6
votes
Arduino Nano uploading gives error: avrdude: stk500_recv(): programmer is not responding
I was having the same problem and got the same error message. Turns out these boards don't come with a bootloader preinstalled. If you have some jumper wires and another working arduino you can use ...
6
votes
How to generate true random numbers over Arduino Uno without any external hardware?
The standard (but not very good) solution is to seed the random number generator from an analogRead() on an unconnected pin. For better options, see this answer to a related question.
- 40.2k
6
votes
Accepted
What exactly does the Arduino preprocessor do?
It does four things, basically:
It adds #include <Arduino.h> to the top of your file, which gives you access to all the classes, functions and defined variables/macros of the API.
It joins ...
- 104k
6
votes
What is wrong with my code? RGB potentiometer
Equality comparison in C and C++ is expressed by == operator. ==, not =. This
if (wavecolor = 0) {
actually assigns zero to your wavecolor variable, thus destroying the value you just read.
The ...
5
votes
Accepted
questions about sketch
Lean the proper C syntax. This is completely wrong:
void gf()
int a = f;//test the conditions of f and store in new variable int a
{
And this is just as wrong for the same reasons:
void ei()
int k =...
- 104k
5
votes
What programming practices should be adopted while coding sketches for Arduino?
Paul covered the most important points. This answer is intended to be a
complement to his.
First, you should keep in mind the general rules, which are more
important than the more specific ones. The ...
- 40.2k
4
votes
How to avoid report of unsuitable sketch names?
That message is actually a hang-over from when the IDE was Processing. The name of a file had to match the name of the Java class within that file, and there are strict rules about what can be in a ...
- 104k
4
votes
Accepted
Integrating Shift Registers into 7 Segment LED Circuit
I have done exactly this, to great effect.
int clockPin = 4;
int dataPin = 2;
int oePin = 3;
// Here are the digits from 0 to 9, as bitmaps.
// You will need to work out which segments are which,...
- 2,373
4
votes
Programming arduino with Objective-C
Simple version: No, you cannot program Arduino using Objective-C.
Long version:
The Arduino IDE uses avr-gcc as it's compiler, and avr-gcc is a C/C++ compiler, not an Object-C compiler. The Arduino ...
- 146
4
votes
Arduino Nano uploading gives error: avrdude: stk500_recv(): programmer is not responding
I recently had the same issue with 3 Nano boards I just purchased from Amazon. I can confirm that the suggested fix (changing to "old bootloader") solved my problem.
I think the main problem is the ...
- 57
4
votes
Loading local libraries
I recently tested this local library structure. It works with:
#include "libs/MyNewLib/MyNewLib.h"
The Arduino IDE 1.6.7 build pre-processing will even pick up the source code for the library.
...
- 7,929
4
votes
Accepted
What is better: one sprintf() or multiple strcat() and itoa()?
Why do you feel you need to use either method? Neither are needed. Just print the individual parts:
Serial.print('X');
Serial.print(first);
Serial.print('Y');
Serial.print(second);
Serial.println('T')...
- 104k
4
votes
"stray '/302' in program error" when compiling
One cause of the /(302) error is copy and paste code from a word processor. You have ASCII codes copied that add spaces, etc to your code. Go through each identified line and remove any extra spaces ...
- 51
4
votes
Accepted
How to execute commands on Arduino (via PC) without touching the current sketch?
The simple thing would be for your sketch to read from the serial port continuously. If it finds something it stores it and when a newline arrives it sees if that happens to be a password known only ...
- 36.4k
4
votes
Accepted
Code is not working (Matrix keypad)
Cited comment:
Check pin modes. Should be INPUT_PULLUP and OUTPUT. Also, consider
debouncing. – Mikael Patel
Please, try:
const char keymap[4][4]={
{'1','2','3','A'},
{'4','5','6','B'},
{'...
- 542
4
votes
What exactly does the Arduino preprocessor do?
See my answer: How the IDE organizes things
I'm not sure if link-only answers which refer to a Stack Exchange link are OK. In case they are not, here is the first part of that answer:
This is how ...
- 36.4k
4
votes
The sketch burned two H Bridges, need help to find out how to modify
As you wrote in comment you use this H bridge:
https://www.ebay.com/itm/60A-DC-Motor-Driver-Module-High-Power-motor-Speed-Control-Dual-Channel-H-bridge/122479397950
The description how to use it is ...
- 1,272
4
votes
Branchless programing on arduino?
There is no cache, so you don't need to worry about that. All instructions are fetched direct from flash and executed straight away.
There is, though, a 2-stage pipeline. That means that in one clock ...
- 104k
4
votes
Can Arduino Sketch be used for production
There's a lot of controversy on this issue, but if it works for your needs, absolutely do it!
Basically, there are 2 questions you have to answer:
Should I use actual Arduino boards in production?
...
- 1,329
3
votes
DC motor makes noise but does not rotate
For the benefit of anyone reading Jeremy Blum's Exploring Arduino book who is having the same issue- he has labelled the transistor wrong in the book so the collector and emitter are back to front. ...
- 31
3
votes
Is there any way to download a sketch from an Arduino?
Download:
avrdude \
-c <programmer type> \
-P <connection port> \
-b <override RS-232 baudrate> \
-p <partno, AVR device> \
-U <memtype>:r:file_name[:...
- 31
Only top scored, non community-wiki answers of a minimum length are eligible