C is a procedural programming language which is widely used in embedded systems. PLEASE NOTE: Arduino is typically programmed in C++, not C.
1
vote
2answers
39 views
Arduino creating delay function
I am trying to make my own delay function. Briefly mydelay function is calling toggled function every secs seconds. The code is not well written, i know (this is the first version). But i am just ...
1
vote
0answers
23 views
troubleshooting - Turn on a single led in a ws2811 ledstrip with an arduino Uno with FastLed
I want to to turn on a single led in a ledstrip running on ws2811 with an Arduino Uno.
The problem is that when I try to turn just one of them on, they all three light up. The strip is a 3-wire ...
0
votes
2answers
34 views
digispark - 2 pin push button to iterate through an hashmap
I'm trying to create a project with my digispark where i can iterate through an hashmap, when i press the push button the digispark writes via digikeyboard the values from an hashmap. Each time i ...
0
votes
5answers
101 views
How to run multiple functions one after another?
I want to fade a red LED up and down, then a green LED up and down, and repeat the whole cycle indefinitely.
I've been trying to run multiple functions one after another. However my current code ...
0
votes
2answers
54 views
Inconsistent response AT command
I'm building a vehicle tracker with Arduino shield with Waveshare SIM 808. I am communicating with the Arduino via AT commands, and came across the following problem: The method "leserial ()" returns ...
0
votes
0answers
41 views
Motor not rotating properly [closed]
I'm trying to follow this tutorial and try to smoothly rotate a 14-pole, 12-slot BLDC motor. However, I'm getting some very abrupt movements. I've tried both the 8-bit and 10-bit timers, but I still ...
1
vote
1answer
26 views
Binary message formatter
I am currently developing an IoT device with arduino and i want to minimise the data payload. First i used json which is not very efficent in fixed messages (the format will always be the same). Then ...
2
votes
2answers
49 views
How to animate a LED Strip via wifi? [closed]
I'm remotely connecting my phone to an arduino MKR1000 via wifi, and sending data via HTTP GET (so to switch on the debug LED, I just need to navigate to http://192.168.1.1/debug/H, for example). Now, ...
-1
votes
1answer
43 views
Keep References Between Objects
I'm trying to recreate a small tween engine so I can interpolate values, leds hue, saturation and brightness in a easy way.
I'm having trouble to reference the value to interpolate into my tween ...
0
votes
1answer
51 views
Using pointers with Arduino
I am learning about pointers.
I was wondering how the memory address is defined in programming. I get different outputs depending on the format I choose for memory address. So I was wondering if it ...
1
vote
2answers
126 views
Most memory efficient way to program
I currently know 3 ways to do a program. Which one of them is the most memory friendly. Note that the example code is simple (blinking a led) and the final code will be VERY VERY complex. Also, the ...
0
votes
1answer
34 views
Get pin input status without using the arduino library
I am not allowed to use the Arduino Library (or any Library) for this program. How would I check the input of a pin?
I found two different functions:
In Arduino.h:
#define bitRead(value, bit) (((...
1
vote
1answer
34 views
How to correctly code a LED STRIP?
I recently bought a 5050 RGB 12V 3A LED strip and I set it all up with my Arduino and run this code (from adafruit website), everything is good:
Example Code
Once you have the strip wired up, it is ...
0
votes
1answer
99 views
From Wiring to pure C
I'm using the Teensy 2.0 (atmega32u4) and decided to switch from Arduino IDE with Wiring to pure C. I think it's much more useful to master programming microcontrollers on that level. Wiring seems to ...
1
vote
0answers
35 views
Arduino code not starting at beginning after poweroff
I created a few Arduino-XBee temperature sensor nodes that send data to another XBee node.js server. I'm running into a few issues trying to write a function to initiate a handshake and receive an ...
1
vote
1answer
22 views
Pass custom element of an array from an inherited class to main sketch
I'm building a base class that creates color patterns using FastLed's CRGB structure. I use the base class as inheritance for another more specific class that modifies a vector of colors (Pixels[]) ...
1
vote
2answers
61 views
AVR (Arduino Uno) Serial.print and Serial.println only printing 1 or 2 chars
I first used the Arduino IDE but now I'm using PlatformIO which is awesome. But I have some big trouble with Serial.print() and Serial.println(). To show this error I have the following example code:
...
-3
votes
2answers
45 views
Errors in code, LM35 temperature logging to web server
trying to experiment with Wemos D1 and LM35. Need to have temperature reading on the ESP IP. Found the following project to be exactly matching my requirements but I am having certain errors in it. ...
0
votes
0answers
14 views
Iqs316 proximity sensors using with Arduino?
Does anyone know how to use the iqs316 touch sensor using for Arduino? I only found the setup code for pic18. I don't know how to setup the iqs316 in Arduino. Please share with me if you know.
0
votes
2answers
58 views
The most effective way to format numbers on Arduino
I made a big search about how to Format Numbers with the Arduino. I want to format unsigned Longs into a String in this format: "23,854,972".
The most of the snippets I found work only with the ...
1
vote
1answer
46 views
max7219 chained display showing text only on the first display
I'm using a max7219 like this one max7219. When I first tested my circuit, I used an 8x8 display and the code worked just fine. Now, after I modified the code and changed the display with the chained ...
2
votes
0answers
42 views
Issues graduating to AVR-C
I'm trying to make the transition from coding in the arduino language to AVR-C, but I'm having some issues with my microcontrollers.
I don't have an ISP, so I'm using one of my Arudino UNOs with the ...
1
vote
2answers
372 views
How do I convert a float into char*?
Asked this question on Electrical Engineering Stack Exchange and was directed here:
Pretty self explanatory; how would I go about converting a float into a char*? I have code in which the float '...
1
vote
2answers
213 views
Arduino- how do I convert a float into char*?
Pretty self explanatory; how would I go about converting a float into a char*?
I have code in which the float 'resistance' is constantly being updated. I would like to be able to update the variable '...
1
vote
1answer
53 views
What does 16u and 128u mean?
The below is a snippet of a code for operating SI4455 Rf module with Arduino. I have some doubts which I'd like to seek some help in clearing.
byte numOfBytes = *pSetPropCmd++;
if (numOfBytes &...
0
votes
1answer
30 views
How to convert char[] to int with fail\success control?
this is more like C question, but i failed to google this.
i expect a command parameter in char[], but there may be no argument passed at all, so i need to try to parse this char[] to int and if ...
0
votes
1answer
40 views
Data transfer using SPI
Sorry for my code is long and my English is not good.
I'm working with 8x8x8 LED cube project using Arduino nano. I tried to understand code, but I don't understand how cube[][] data write on pins.
...
0
votes
0answers
160 views
cannot convert ‘String’ to ‘const char*’ for argument ‘1’ to… How to send a String by wifi?
When I try to send a normal string like "Hello" my example code works, but if I try to send it like a String variable it calls an error.
cannot convert ‘String’ to ‘const char*’ for argument ‘1’ to
...
0
votes
0answers
42 views
Good guides to learn Arduino preferably with C and without IDE
I have played around with Arduino Uno and browsed through some basic introduction guides. I really like that it has been made easy to start programming via IDE and you get the led blinking in no time. ...
3
votes
1answer
47 views
Informations lost in a string
At first, I sorry if I make some English faults but I'm French.
So, I'm making a connection between a client and an Arduino Uno. I receive all data that I need but when I send a response to my ...
0
votes
0answers
57 views
Response to a client
I am new (and French) so, sorry for my English.
I am developing an Arduino application with an Arduino Uno and an Ethernet Shield 2. I need to receive some data from a client (like, e.g. which ...
0
votes
1answer
39 views
PWM output voltage too high
I'm experimenting with PWM with the code below, but (according to my analog multimeter) the voltage on the output pins reach up to 5V whilst the largest analogRead(IN1) value is only around 700:
...
0
votes
1answer
239 views
compare uint8_t to char array
I am not actually using ad arduino but an atmel chip. but my question is c microprocessor related
I am reading an uart which returns data in the form uint8_t [100]
I can print the return just fine, ...
1
vote
1answer
68 views
Unable to replicate Arduino code into ATmega8 code
I am trying to replicate an LTC Audio Decoder code from Arduino Uno into AVR ATmega8 which I got from here.
My Arduino Uno code is working great. Here is my Arduino Uno code:
#define one_time_max ...
0
votes
2answers
95 views
Issue with IF statement condition
I am using 2 accelerometers connected to an arduino. The code below does not work.
> if((acc1 >= 20 && acc1 <= 40) && (acc2 >= 20 && acc2 <=40)) //If acc1 is ...
0
votes
0answers
63 views
Low Power Mode on Blend Micro
I am making a project which envolves an arduino (redbear blend micro) . Basically I followed the getting start procedure to put things working in the IDE and it's done.
For now, in order to save ...
3
votes
2answers
80 views
What is the Arduino compiler's version of `__unused` for function parameters?
When I first started with the Arduino environment I noticed that it had File | Preferences | Compiler Warnings set to None, so I set it to All - and there were many, many warnings in the supplied ...
3
votes
1answer
92 views
How to Implement Simple, Quick HMAC on Arduino
Hi I am a research student working on securing the communications in Controlled Area Networks (CANs), and I am using Arduinos to simulate one of these CANs.
My goal is to use HMAC to implement ...
0
votes
2answers
98 views
Would rewriting my code in C help reduce RAM usage? [duplicate]
So my program fails to run because there is not enough room for my variables as well as the Arduino Core and Stack. I can't find any more ways to optimize my program so I'm thinking about just ...
0
votes
0answers
33 views
Modscan Request format
I have downloaded the modbus RTu library from below link. The code seems working for me. I Need help in Modify sending request format with same library function.
Here is My part of code. I am also ...
1
vote
1answer
133 views
Reading a .csv file element wise
I'm fairly new to arduino programming and C/C++. I would like to read a .csv file element wise, and send each element via. a nRF24L01 tranceiver to a raspberry pi. Right now I'm able to read the .csv ...
1
vote
0answers
49 views
Modbus Protocol RTU
I have simple code working on Serial Communication asn below. With Same data i would impliment Modbus protocol> I have Used Modbus library for arduino earlier which works fine with 9600 baudrate and ...
0
votes
2answers
813 views
Converting an array of uint8_t to a char array
I'm trying to convert this array uint8_t data[] in the code below to a character array to be printed in the serial monitor. However, when I run this code I see a blank screen. What am I doing wrong?
...
1
vote
0answers
39 views
Serial Request error
I am working on arduino Uno board.I am trying to send request Serially from out Side using docklight.I am sending COmmand is request send every 5S to 10S and get response.When i tested this code with ...
0
votes
1answer
35 views
Storing integer into character buffer
I have my Arduino code as below.I am trying to send Serial request and get response for it. I can able to send request mentioned in Setup function and also able to switch cases. Problem i am facing ...
5
votes
2answers
315 views
Arduino's digitalWrite, precautions for direct port manipulation?
I stumbled upon this piece in digitalWrite.
I'm unsure why clearing interrupts and setting/resetting SREG is neccesary here.
Can anyone shed a light on this?
uint8_t oldSREG = SREG;
cli();
if (val =...
0
votes
2answers
54 views
MPU6050 acceleration values not 16-bit?
I'm looking at the little code snippet from this (many other projects also use similar code):
void loop(){
mpu.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
ax = map(ax, -17000,...
0
votes
2answers
258 views
How to compile an official VS1003 / VS1053 example for Arduino / ESP8266?
Have anyone ever successfully run any of the official playback and recording examples for VS1003 or VS1053 on Arduino / ESP8266? I mean, I was able to play sound with VS1003, but I just can't make the ...
1
vote
1answer
132 views
ESP8266 not able to communicate over serial connection with arduino UNO
This is the code I uploaded in Arduino UNO:
#include<SoftwareSerial.h>
SoftwareSerial ESP(2,3); // RX, TX
//ESP RX-->3(UNO) TX-->2(UNO)
void setup() {
// Open serial communications and ...
0
votes
0answers
71 views
PID Implementation on DC Motor Speed Control
The motor will only be very slightly loaded.There is no particular physical application, the point here is to show proof of principle.
Since the motor control is unidirectional, I plan on using a ...
