C is a procedural programming language which is widely used in embedded systems. PLEASE NOTE: Arduino is typically programmed in C++, not C.
0
votes
0answers
10 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
49 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
32 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
36 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
54 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
80 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
42 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
26 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
27 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
57 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
37 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
45 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
37 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
31 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
74 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
61 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
92 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
55 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
59 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
56 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
93 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
24 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
65 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
36 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
365 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
38 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
34 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
292 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
42 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
159 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
86 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
56 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 ...
0
votes
1answer
52 views
Arduino: put string through variable in array
I have a problem and I can't fix it.
I'm busy with an java to arduino project.
Java writes a string using writeString();
Arduino reads the serial monitor and put the incoming string into a function.
...
0
votes
1answer
71 views
String comparison
[![Out put file][1]][1]I have simple code written in arduino. I am sending serial command via comma separated values. I have string in format. if the first 2 comma separated value from PC matched then ...
0
votes
1answer
49 views
Wifi rssi converting char[] to uint8_t
I am trying to get RSSI of a network without connecting to it directly but I get an error " error: cast from 'const char*' to 'uint8_t {aka unsigned char}' loses precision [-fpermissive]"
char ...
0
votes
2answers
60 views
How do I pass an Int Array into void for a foreach loop?
I know its probably an odd question...but I found a workaround for a foreach loop in C. I have a whole bunch of int arrays that I would like to be able to pass into a void, which has that foreach loop ...
0
votes
1answer
102 views
Arduino serial non-blocking
I'm writing an Arduino program to communicate with another module using RS485, so I need to control data flow with one pin. But when I set the pin to HIGH (line 88) it almost instantly falls (as you ...
1
vote
0answers
27 views
Why am I only receiving the first address byte? (I2C Protocol)
Expecting the slave to ACKnowledge and return data, but it does not. This is my protocol. This is my Datasheet.
Also FYI I'm on an Arduino Fio but I am not inheriting the Arduino library.
#include &...
1
vote
0answers
117 views
Error with libraries after setting up Code::blocks to work as an arduino IDE
I followed this guide: http://arduinodev.com/guide-to-arduino-development-environment-codeblocks/
Everything seemed to work until I compiled the example code:
#include <Arduino.h>
/*
Turns ...
0
votes
1answer
49 views
Why does this code show me a lot of space?
I want to make a 4hz reading of GSR and temperature, in the following format for every second:
697,20.8744
696,20.86521
695,20.8653
699,20.8777
The print, in python, would be print(GSR+","+Temp)
...
0
votes
2answers
108 views
Removing Element From Array While Keeping Order
I'm building a wireless mechanical keyboard. There is an array of 6 elements that stores the keys pressed by the user (since 6 is the max number of keys you can send at once over Bluetooth). An ...
0
votes
1answer
37 views
Why does this method return an unprintable character, how do I convert it to display correctly?
Page 14 says that the method should return the value 'h17'
typedef struct {
uint8_t data;
uint8_t timestamp;
unsigned char crc;
} tData;
int main(void)
{
unsigned char* tempData = "snap";
...
1
vote
1answer
50 views
How do I use SNAP protocol, correctly?
I've reviewed the documentation
I'm still a little lost when it comes to applying the functions. Each of the redundancy check methods take in an unsigned char and return an unsigned char.
Shouldn't ...
0
votes
2answers
19 views
Stop multiple presses in vex bumper (Unexpected bumper output) [closed]
According to Official documentation of the Vex Bumper, it states that the bumpers will cause:
the robot sometimes [counts] a press twice. This issue is also caused by the robot counting too fast ...
3
votes
1answer
61 views
Using map for DC motor instead of servo
I am trying to use map command which is used to power servo 180 degrees as the potentiometer moves...
in fact what i want to do is just when i adjust my potentiometer to zero; stop the dc motor then ...
0
votes
2answers
49 views
Fastest way to test if two integers differ by 4 or equal to each other
I'm searching for the fastest way to test if two integers are equal or differ by 4. The integers can be positive, negative and equal to zero. They are between -1000 and 1000 and are exclusively ...
0
votes
1answer
67 views
How to convert array of chars to array of ints?
I have a rather newbie question but I can't figure it out.
Lets say I have this char array:
char array[] = "10,11,12,1,0,1,0";
How can I convert it to an array of int like this?
int arrayINT[] ...
0
votes
1answer
52 views
Understanding the contents of a library in C
So this is a question not just about the #include but most all includes you find while programming in C.
So I understand a library is prewritten code and when you include that library are you able ...
1
vote
1answer
166 views
Problem reading an EEPROM chip using I2C protocol
I am trying to read an EEPROM chip that supports the I2C protocol (cannot tell the IC model number as it is not printed). For sure it supports the I2C protocol, since I wrote a code to detect it using ...
-1
votes
1answer
54 views
Simulated Arduino displaying same temperature over and over again
I'm new to Arduino so im still getting used to it...ineed to read the temperature of temperature sensor in arduino. Whatever i do, it keeps displaying same temperature(don't even know if that's wrong, ...
