Questions tagged [arduino-uno]

The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.

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Ultrasonic Flowmeter Using TDC-GP22 and Arduino Uno

I'm working on a project of Ultrasonic Flow Meter with TDC-GP22 using Arduino UNO. I used the library of leokoppel In my code,the configurations of the registers are copied from the Application Note ...
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3 votes
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PCA9685 - Hardware problem with diode?

I'm working on a project, where I need to run several high-torque servos. For that I bought come of these PCA9685 boards. I hooked everything up with my arduino and connected an external 5V - max 3A ...
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3 votes
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220v lightbulb gradual dimmer

I am trying to turn my incandescent bulb gradually,say its brightness should go from zero to 100% in 10 mins. In doing so I found the following code and it works well but it's not as gradual as I ...
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3 votes
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SPI register read returns 0x00 or 0xff

I am trying to interface a Arduino Uno with an ASM330LHH using SPI. Whenever I try to read any register, I either get 0xff or 0x00 on the serial monitor The code I am using: #include <SPI.h> #...
3 votes
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1k views

Modbus TCP/IP using Arduino uno and ENC28J60 module

I have this project where I need a modbus tcp server that will host a series of sensor data for other modbus client devices to read. I use this Library by Andresoarmento This is the code i am using ...
3 votes
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956 views

how to get live view of esp32cam at remote sever using ssh tunneling?

I have found many projects involving esp32cam, but in all projects video is being seen on local server only.For its of no use.As for a home security project user can view the video at remote location ...
3 votes
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294 views

I want to save the value of the scanned barcode on an SD Card (in a text file may do)

serial monitor output #include <usbhid.h> #include <usbhub.h> #include <hiduniversal.h> #include <hidboot.h> #include <Wire.h> #include <SPI.h> #include <SD.h&...
3 votes
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372 views

STM32 Nucleo-L432KC can't send data to Arduino Uno via nRF24L01 module

Hello everyone. First of all, I know you're going to tell me to send my question on the stm32duino forum. But I tried to enter the stm32duino forum and I didn't succeed (I think their forum is closed)...
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How to use SPI to set/ read registers for a sensor (Avoiding need for Github Lib)

Ok so as some readers might have seen, my current project involves using MPU's. The idea is sending data via CAN bus to a controlling MCU to then send to a raspberry pi to perform the calculations ...
3 votes
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Using the TimedAction library

I need to make use of the TimedAction library for a project. The Arduino website gave an example of how to use this library which you can see here: #include <TimedAction.h> //this initializes ...
3 votes
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643 views

Is it possible to put ATtiny85 to sleep while using TinywireS?

I have an arduino uno as the master I2C device talking to an ATtiny85 as the slave. What I want to do is have the Attiny85 receive a message from the UNO to tell it to power off which will then ...
3 votes
1 answer
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Saving EEPROM after programming on Arduino uno

I am using an Arduino Uno, and I use the EEPROM to store some presets. It works fine. But, when I reprogram the Arduino, the EEPROM gets wiped out. Is there a way to prevent this, and have the EEPROM ...
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Run Servo when detect object on OpenCV Python

I want to connect OpenCV (Python) with arduino Uno when it detects a tennis ball. OpenCV code: import numpy as np import cv2 import serial face_cascade = cv2.CascadeClassifier('tennisballdetect.xml')...
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239 views

Arduino UNO WiFi RestServer returning "not found"

I'm trying to run RestServer on my Arduino UNO WiFi, and I'm currently using the tutorial from Arduino: http://www.arduino.org/learning/tutorials/boards-tutorials/restserver-and-restclient Everything ...
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407 views

How do I go from modules to PCB?

For my engineering class, I am designing a digital scale. I have already made a working proof-of-concept by using jumper wires to connect several arduino modules to an Arduino UNO. I want to make a ...
3 votes
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392 views

DHT22 reading weird values

I just hooked up a DHT22 I had laying around in a parts drawer to test something and it is giving out some crazy wrong values, I am running the adafruit library's unified example and this is the ...
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3 votes
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333 views

Is Arduino WiFi101 library fully compatible with Arduino MKR1000 with WiFi HW?

Will all the classes in this library work with the MKR1000 with wifi hardware? The guide mentions "wifi shield". So, does the library work exactly the same with the Arduino MKR100 (with the onboard ...
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Nordic nRf905 (433MHZ) with arduino receive garbage data

I am interface Arduino with nRf905 in receive mode use 433 MHZ. I Have follow this link http://www.electrodragon.com/w/NRF905_Transceiver_433MHz-Wireless_Module. And for transmitter, I am use RF-...
3 votes
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681 views

Camera VC0706 not found

I tried connect my Arduino Uno R3 with module camera VC0706 following this instruction of Adafruit: https://learn.adafruit.com/ttl-serial-camera/using-the-camera. [VC0706] --- [Arduino] Vcc --- ...
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60 views

Low byte fuse programming of atmega328 of arduino uno

I want to use the atmega328 of my arduino uno board to clock TDC 1000, using the clkout bit of atmega328, but this requires fuse programming of the low byte, Can any one tell me how to do it ??
3 votes
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640 views

RFID Code (and setup) works on an UNO but not on the Yun

We're using two RDM6300 RFID readers for this, and the code works when plugged into an UNO, but not when connected to the Yun. We have one of the rfids plugged into the rx pin (0 on the digital side) ...
3 votes
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472 views

Connecting arduino and EV3 using I2C

I'm trying to connect arduino uno and ev3 by using this guide (http://www.dexterindustries.com/howto/connecting-ev3-arduino/), everything works perfectly but when i tried to use analogRead block to ...
3 votes
0 answers
2k views

How to upload .hex file to Atmega8 Using Arduino IDE and Uno as an Isp?

I want to upload an .hex file to an Atmega8 chip (SMD). I want to use the Arduino IDE and an Uno as the ISP program. But I'm unable to find any details on how to load a sketch which is in .hex format. ...
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621 views

ESP8266 and Arduino bidirectional streaming from and to a website

I was looking for some easy tutorial on bidirectional communication via ESP8266 connected to Arduino UNO. I want to send and receive strings from and to JQuery based website. However, I couldn't find ...
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1k views

Using Johnny-five API with RFID Controller Shield

Is it possible to use the Adafruit PN532 NFC/RFID Controller Shield with the Johnny Five API? I've searched the depths of google and I'm unable to find anything so far. If it is possible, how can I go ...
3 votes
0 answers
6k views

Sending AT commands to a gprs shield using serial port

I have a GPRS shield connected to an arduino uno board, i want to use the shield to send sms and do phone calls, from a C# Wpf application, the arduino is connected to the application using the serial ...
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Uno Ethernet shield and TMP36 reading

I am just getting started with my Uno via the Vilros Ultimate Starter Kit. I've done all of the sample circuits and played around with a few other things. Today I connected the Ethernet shield with ...
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184 views

How far can i go just with this starter kit?

I want to buy this kit: http://www.banggood.com/UNO-Basic-Starter-Learning-Kit-Upgrade-Version-For-Arduino-p-970714.html However, as shipping stuff from China takes like 3 months to arrive, i need to ...
3 votes
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2k views

How to read temperature using arduino uno board with PT100 RTD sensor?

I am new to arduino programming. And almost inexperienced. I am looking to program my arduino Uno board to read 2/3/4 wire configuration of PT100 RTD sensor (in accuracy levels of atleast 0.5°C). The ...
3 votes
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790 views

Why won't Wifi Shield detect any networks? Even really close

I just purchased an Adafruit Wifi Shield CC3300 and strapped it onto my Arduino Uno board. I'm running this basic sketch that I found to test the functionality of the Wifi Shield: http://arduino.cc/...
3 votes
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400 views

How can I open simultaneously 2 client socket connections with GSM shield?

How can I open simultaneously two socket connections with a GSM shield? It seems that when I try to open the second connection, it is not opened, and additionally the first connection is closed. ...
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2k views

Interfacing SD card with arduino without shield

I am trying to connect SD card with arduino without using a shield. To convert to 3.3v, I have used voltage divider circuit as described in these two sites: http://garagelab.com/profiles/blogs/...
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1k views

Hub RFID Arduino + WIFI

I will start an Arduino project and its main requirement is that some RFID readers (at most 6 readers) be connected and controled by the arduino board. I do not have a strong background in ...
3 votes
0 answers
866 views

Negative value conversion for modbus slave

I have an analog sensor which reads values 0-5v, -75 degrees to 75 degrees. Now I have converted to +75 degrees and -75 degrees format depend on the voltage. From 2.5v to 5v data is read properly (i....
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3 votes
1 answer
4k views

Running two stepper motors with two rotary encoders

I'm really bad with this coding part of using two rotary encoders to control two stepper motors [using 28BYJ-48 stepper motor with the ULN2003 board]. This code works fine using one rotary encoder for ...
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3 votes
1 answer
3k views

Atmega328P-PU: Programmer is not responding

Few days ago, I built my own custom Arduino on the breadboard. It is built according to tutorial on http://www.crash-bang.com/resource/breadboard-arduino/. The Atmega328P-PU is already burned with the ...
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2 votes
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42 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 ...
2 votes
0 answers
140 views

Arduino filling serial buffer with nulls

I just wrote some code that just sends a string from Arduino to Processing. Processing prints the string and displays the number of characters in the buffer... After uploading the sketch to the ...
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228 views

Turn on a relay for a specified amount of time after the press of a momentary switch

This is my first time programming an Arduino. I have a small brushed DC motor that I want to control using a 5V relay, which in turn is connected and controlled by the Arduino. What I would like to do ...
2 votes
0 answers
144 views

Arduino OLED ssd1315 graphic print questions

I’ve tried to create a system that the rotary sensor as an input and use a 0.96 inch Oled as an output (first pic), try to show the voltage measurements and performance test using a small bar graphic. ...
2 votes
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330 views

HTTPClient works with localhost but not server

I started to work with HTTPClient and the WiFly library to connect to an SSID and then send POST data to a server. When I was sending the data to my localhost, it was working on localhost, but when ...
2 votes
0 answers
58 views

My port is grayed out?

Hello I have a question on why my port is grayed out when I go to upload? I’ve watched so many YouTube videos on what’s the problem and have been trying to do everything but just nothing seems to work!...
2 votes
0 answers
97 views

Simulink resets arduino

I am working on servo motors control through serial communication protocol, I am sending data from Simulink to arduino and vice versa, The problem I am getting is that once I open Simulink Servo ...
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129 views

ESP8266 01 doesn't react after baud rate change

Hello guys I have my ESP8266 connected to my Arduino. Then I typed in AT in the serial monitor. It confirmed this command with OK. After that I typed in AT+UART=9600, 8, 1, 0, 0 which gave me the ...
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2 votes
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47 views

Infrared Reciver doesn't work properly after the first signal

i'm trying to play a passive buzzer with an IR reciver My Code #include <IRremote.h> IRrecv irrecv(10); decode_results results; void setup() { // put your setup code here, to run once: ...
2 votes
0 answers
200 views

External Interrupt and Input Capture pin | Arduino MEGA

I have a code for finding the rpm of one system calling here as engine , the engine have a hall sensor output and I have tried the following Code #define SERVO_MIN 2000 #define SERVO_MAX 4000 struct ...
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79 views

Connecting Arduino Uno's TX pin directly to Esp8266 esp-01

I am new to esp8266 esp-01 and trying to figure out how to use it, in many tutorials on internet, I have seen people have connected Arduino uno's TX pin directly to esp8266 esp-01 without any voltage ...
2 votes
0 answers
47 views

receives 0 0 instead of "hello"

I receive the following: 09:27:10.618 -> 0 0 09:27:12.589 -> 0 0 09:27:14.616 -> 0 0 09:27:16.622 -> 0 0 09:27:18.576 -> 0 0 09:27:20.577 -> 0 0 09:27:22.583 -> 0 0 09:27:...
2 votes
0 answers
34 views

About Corrupted LM35 IC and Arduino port problem

I have one Arduino Uno which was working fine by below circuit(link): But when I have connected the new bought the LM35 Ic by the below connection: The Arduino UNO don't be recognized by the my ...
2 votes
0 answers
38 views

Reading and writing to GD25B32CPIG flash memory

I recently removed a GD25B32CPIG flash memory chip from a commercial coin-operated arcade game. Apparently it has all the game's sounds stored directly on the chip. I decided to see if I can learn to ...

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