Questions tagged [arduino-uno]
The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.
8,078
questions
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0
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Unable to use RF M4 Receiver with servo motor
I am trying to control a servo motor with the following code:
#include <Servo.h>
Servo servo;
int const inputPin = 3;
void setup() {
Serial.begin(9600);
servo.attach(9);
pinMode(...
- 11
1
vote
1
answer
542
views
Wire.write invalid conversion from ‘char*’ to ‘const uint8_t*
I have written this code:
char message[4];
memcpy(message, &delta, 4);
Wire.write(message, 4);
When I try to compile I get this warning:
warning: invalid conversion from ‘char*’ to ‘const ...
- 33
0
votes
1
answer
363
views
Arduino nano timing precision
How precisely can an Arduino nano be timed? The project I am working on needs two Arduino nano to work synchronously. Arduino one have to activate a relay after 2700 sec and Arduino two have to ...
- 183
0
votes
2
answers
562
views
SoftwareSerial will not read all of the printed string when calling readString()
I have an Arduino UNO and an ESP32 that need to communicate to each other using SoftwareSerial. The problem I am coming across is that when I call readString and print it out using Serial, it will not ...
0
votes
1
answer
82
views
Making library for arduino
I'm learning library making on arduino , I want to make a library that works with arrays a user sets, e.g:
User sets array of int,
when a certain function is been called the library will check if ...
- 79
-2
votes
1
answer
93
views
Arduino code giving error while compiling [closed]
I am a beginner, and I'm trying to make code to control a servo using two ultrasonic sensors.
I've tried to make the code, but when I tried to compile it using my simulation app, it gives this error:
...
- 79
2
votes
1
answer
92
views
Curious Collision between OneWire and RadioHead
The code below runs on an Arduino Pro Mini (8MHz 328p) sending temperature readings using an inexpensive ASK transmitter. I use OneWire to read the DS18B20s, and RadioHead to manage the radio.
The ...
- 125
0
votes
0
answers
57
views
SPI - CS Intermittently Goes High on Arduino UNO
This question is similar to SPI - Apparently Random pulses on CS/SS line in that I have a single SPI peripheral (a Microchip 23LC512 Serial SRAM) that an Arduino UNO is communicating to.
Everything is ...
- 101
0
votes
0
answers
68
views
I need help with serial communication between Arduino Uno and NodeMCU [closed]
I want to transfer analog readings i.e. variable values from a NodeMCU to an Arduino Uno so that on the Arduino side I can check those values using an if condition and make a buzzer sound. Please help ...
-1
votes
1
answer
135
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How to read analog sensor data with different timers in arduino
I have three analog sensors like voltage, temperature and pressure. I need to measure the voltage and temperature every 10 ms and I need to measure the pressure alone every 30 ms by using the timers ...
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3
votes
1
answer
116
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Detecting an approximate angle/location of a light source using phototransistors
Note: [I am approximately two weeks into learning Arduino and hence have little experience with utilizing Phototransistors.]
My plan revolves around placing four identical Phototransisors which are ...
1
vote
1
answer
160
views
DHT11 temperature and humidity sensor Code
I’ve got a question about this code I’ve attached please- would it be correct to read it like this:
After defining the variable temperature and humidity and assigning measurement_timestamp to millis(),...
- 13
0
votes
2
answers
344
views
How to tri-state output circuit
I need a circuit where an Arduino MCU can set an output to 3 different states.
HIGH (12V)
LOW (GND)
N/A (completely disconnected)
Using transistors seems to be the correct way but I am too much of a ...
- 11
2
votes
1
answer
70
views
Ramping servo motor taking longer than calculated
I'm learning how to code a "BOE Shield bot" with a partner at my university (first year). To clarify for those that do not know: a BOE Shield bot is a small robot equipped with 2 servo ...
-1
votes
1
answer
163
views
4x3 keypad not providing any output and the output it does provide is incorrect
I am trying to figure out how to use a 4x3 keypad and just want to receive the key numbers I select on the serial monitor. The problem I am getting is that some of the keys I type don't give me any ...
2
votes
2
answers
70
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Can a three wire Electrical conductivity sensor (Sensorex CS 150) be used directly with arduino?
I am having an electrical conductivity sensor (Sensorex CS150 with three tinned wires Red, Black and white https://sensorex.com/product/sensorex-cs150-12-mm-graphite-contacting-conductivity-sensor/ ). ...
-1
votes
1
answer
220
views
How do I stop my servo from repeating the loop and perform the rest of the functions?
The project has a makeshift meter (via a half circle cutout and a servo motor operated lever). On program start (button 2), the lever will move to the left hand side at the 9 o'clock position. Once in ...
1
vote
1
answer
912
views
i need help on how to use busy pin in df player to arduino
i need help on how to use busy pin in df player to arduino.... while playing one sound or df player is busy, i don't want to trigger df player by ultrasound sensors to play another song. here is my ...
- 11
1
vote
0
answers
219
views
READ 433mhz DEVICES
I have an issue with 433mhz reading. I have two cheap transmitter and receiver boards, the most known ones :
I followed several tutorials, and I'm using the rc switch library.
I'm trying to read the ...
- 65
1
vote
1
answer
209
views
Run encoder code simultaneously with other code in Arduino
volatile unsigned int temp, counter = 0;
int county=0;
void setup()
{
Serial.begin(9600);
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
attachInterrupt(0, ai0, RISING);
...
- 11
1
vote
1
answer
410
views
Issue communicating with ESP32 (WT32-S1) with my USB FTDI (hw-417-v1.2)
Basically im trying to communicate bewtween my ESP32 (WT32-S1) and my USB FTDI (hw-417-v1.2) when I run it in the Arduino IDE I get the error "Failed to connect to ESP32: Serial data stream ...
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-1
votes
1
answer
133
views
LEDs controlled by PHONE on ESP32
I am having doubts with a project I'm making.
My project involves a sets of LEDs stripes, among which some are controlled from a smartphone, and some automated. The LED strips are connected to an ...
- 65
-1
votes
1
answer
125
views
Does ADXL 345 accelerometer not wirk with Arduino Uno without soldering?
I followed the Adafruit tutorials to wire the ADXL 345 with Ardiuno Uno, but it is not able to detect the sensor. It did not mention that I need to solder the ADXL 345. Is soldering necessary?
1
vote
2
answers
108
views
Stoplight Simulator - White LED not turning on with button press [closed]
I am working on a relatively simple stoplight simulator that uses four LEDs - red, green, yellow, and white - in addition to a button. The 3 colored stoplight LEDs cycle as a real stoplight would. If ...
- 19
1
vote
2
answers
149
views
PWM with a TRANSISTOR on flexible LED filament
I would like to create a custom lighting, with PWM capability, powered from battery. I would like to use flexible led filaments, and since those consumes more than 40mA, I can't use them directly on a ...
- 65
1
vote
1
answer
72
views
Fading out a led with reed switch loop
I was hoping to get some help on the fading led which I am working on.
For my project I need to have a led, which when it is placed next to a magnet, continuously shines, but as soon as it is taken ...
- 13
0
votes
2
answers
239
views
How do I put a LiquidCrystal_I2C class in a Lcd class?
I want to make my main code cleaner so I was thinking of making a Lcd class which I can use every time I need to print on lcd. So my main code every time I try to print text I need to call :
lcd.clear(...
- 13
2
votes
1
answer
142
views
Multiple unique I2C devices interfere
I'm trying to make a fairly simple program that interfaces with the Adafruit TSL2591 light sensor as well as a MAX30102 pulse oximeter. They both use I2C for communication. I'm using the recommended ...
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0
votes
1
answer
81
views
power 12v solenoid from DC jack of Arduino Uno
I was wondering if it is possible to power up a 12V solenoid valve from the DC jack of the Arduino Uno, provided that I'm powering the Arduino from the same jack:
- 111
1
vote
0
answers
224
views
Getting “Open the GPS power failure” on module SIM808
I tried to get the gps coordinates with this program:
#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#define PIN_TX 8
#define PIN_RX 7
SoftwareSerial mySerial(PIN_RX,PIN_TX)...
-1
votes
1
answer
208
views
How many stepper motors can you run on one Arduino Uno? Ideas on how to run 9?
I am in middle school and new to Arduino. I just learned to set up and code a stepper motor on my Arduino Uno from watching YouTube videos. I want to set up 9 stepper motors to all run at the same ...
-1
votes
3
answers
123
views
Is there any way to efficiently code reading of four sensors and sending a serial output once it does detect a reading?
I am actually wondering if there's a way to efficiently do this block of code. There are two things in my specifications and these are:
Four IR Sensors that detects blockage. Basically just to ...
- 111
0
votes
1
answer
106
views
How to control PWM and digital pins at the same time over ethernet in arduino
I am using Controllino Maxi. It has an Arduino Uno inside it. I am trying to control the PWM pin D0 and digital pin R0 via python code. Below is the code I have upload on arduino:
Arduino Code:
#...
- 183
-1
votes
1
answer
106
views
Continous Rotation Servo not changing directions
I have coded a robot to be controlled by a ps3 Controller. I am using continous rotation servos but unfortunately I can not figure out how to get them to change direction. My input for my if ...
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2
votes
1
answer
138
views
The code to turn off the RGB LED by pressing the 4,5,6 switches in sequence doesn't work
I'm making photoresister alarm. When distance under 5cm over notes[] 5 times, piezo speaker off. And I want to turn off the led rgb by pressing the 4, 5, 6 switches in sequence. The code to turn off ...
- 21
1
vote
1
answer
417
views
How to read and parse UART data from human presence radar sensor
I'm working on a project, and I purchased a 24 GHz "Human existence/presence" mm Wave sensor from micradar, the R24DVD1. The output of the module is serial data which varies in length and is ...
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-2
votes
1
answer
184
views
How can I send Arduino sensors data to java application?
my final year project is to do an Arduino watch that has heart rate and body temperature sensors and also a location tracking module. I need to send all the watch data to my java app but I don't how ...
1
vote
0
answers
168
views
Arduino Uno Stuck at uploading
I wrote a basic blink code and tried to run it on the auduino IDE. Compilation was sucessfull but the code stucks at uploaing. I turned on the verbose output while uploading and this is what I have ...
- 11
0
votes
1
answer
127
views
Balancing pendulum using PID
Dear all, referring to the video at here on how to make a PID balancing pendulum as shown in the picture and the author also provided the arduino code in the video description. May I ask whether this ...
- 101
-1
votes
1
answer
188
views
How to write arduino code in a c/c++ script
I'm pretty new to arduino. But I have some knowledge about programming in c/c++. I know that arduino is written in c. But it can't be used as normal c/c++ code.
for example ,
instead of including some ...
0
votes
2
answers
1k
views
The same button with one click and double click [closed]
i hope to get some help with my code.
I am trying to distinguish between a single press and a quick double press of the button with debouncing.
I am making some silly mistake in my code and i can't ...
- 69
0
votes
2
answers
92
views
How to reduce codes numbers
I am new in Arduino projects, i made a digital counter that counts from 00 to 99.
Here is my code below
void setup()
{
pinMode(0,OUTPUT);
pinMode(1,OUTPUT);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
...
- 79
-1
votes
1
answer
118
views
I2C HMC5983 communication issue
I have a really weird problem, when I run the exmple wire (I2C) scanner from Arduino, I get:
I2C Scanner
Scanning...
I2C device found at address 0x1E !
done
However when I try directly to the 0x1E I ...
- 99
0
votes
1
answer
70
views
Arduino not recognizing external microcontroller
I've been trying to follow the official Arduino instructions on how to program and power an external breadboard, and I've gotten a pack of ATmega328p's that may or may not have been preloaded with the ...
- 137
1
vote
2
answers
1k
views
Changing Frequency of PWM Pin on Arduino Uno
I am trying to change the frequency of the PWM output from an Arduino Uno R3 (Been using Pin 9) to 200 Hz with a duty cycle of 20%. This is for an ESC that is connected to a 12V motor, and I know the ...
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0
votes
1
answer
224
views
Connect OLED SSD1306 to Elegoo Uno R3
I'm trying to connect the OLED SSD1306 screen to my Elegoo Uno R3 and display something using Arduino IDE. However, nothing shows up on the screen for some reason.
I have connected every pin in the ...
- 113
0
votes
1
answer
83
views
Problem with character concatenation algorithm in matrix led
good afternoon, I am making a 7x10 led matrix in which I use a CD4017 to handle the 7 rows and 2 cascaded shift registers to handle the 10 columns.
I first tried a programming to turn on my entire led ...
- 105
0
votes
0
answers
374
views
How to program Attiny12 with Arduino?
I bought a bunch of Attiny12's from Digikey without checking if I can even program them with an Arduino. I've looked around a bunch, and I've only ever found ways to program Attiny13 and Attiny10.
...
0
votes
2
answers
110
views
Bluetooth Arduino Data Type Error
In my code I want to send some float values from my phone to the Arduino's Bluetooth which I will then split using the substring function. it will then print that split value to the serial monitor.
I ...
0
votes
1
answer
708
views
No matching function for call to'DS3231 (const uint8_t &, const uint8_t &)
This was supposed to be the code for automatic pet feeder
Got it from here1
The problem is that I always got a "No matching function for call to'DS3231 (const uint8_t &, const uint8_t &)&...
