Questions tagged [arduino-uno]

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

1,142 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
10
votes
1answer
2k views

Update Dynamically Tkinter Widget Scale from Arduino Ports using python and firmata

I'm having trouble trying to get Arduino digital ports values and set these values into a Python Tkinter Widget Scale. I'm using Python and Arduino with Firmata. I'm able to access my arduino board ...
8
votes
5answers
2k views

Fluctuating readings of LM35 temperature sensor (+- 5°C) with Arduino UNO

I am trying to read a LM35 temperature sensor with Arduino UNO which I got as a gift. The issue is the fact, that my readings of sensor are, well, suspicious at least - they jump with each reading ...
5
votes
1answer
197 views

Working with multiplexers for constant voltage output

I'm working on creating a circuit where I'm trying to have the ability to switch multiple strands of LED rope on and off at a time using an Arduino and a multiplexer. With my current configuration, ...
4
votes
1answer
960 views

Flash String Helper object as variable

So I have a Bunch of commonly used char arrays to build commands in my library. So to preserve memory, I have them put into flash, via PROGMEM ext, typedef const char PROGMEM ProgChar; ProgChar AT[] =...
3
votes
2answers
889 views

SIM800L and Arduino Sleep - getting whimsy Serial output after 5 calls

i'm working on project where i'm trying to achieve that arduino parse caller ID so i can use it later to send SMS with sensor reading data. Somehow i made that code (with much googling) and it works ...
3
votes
1answer
590 views

Powering Multiple Servos From One Battery- What is my circuit missing?

I'm working on a robotics project right now and my limited DIYer knowledge of electrical circuits is failing me. I need to power 7 Rage Standard Metal Gear Servos (RGRS104-16-6vm) and 4 RadioShack ...
3
votes
2answers
597 views

DS1307 Real-Time Clock

I am trying to make an Arduino project based on the Sparkfun DS1307 RTC (real-time clock). There are a few issues with how Arduino libraries don't support checking if the Arduino board has been ...
3
votes
0answers
877 views

Arduino Uno doesn't work as Manchester code receiver

I'm sending some data from ATTINY85 to Arduino UNO using 433Mhz modules. Coding is Manchester using Manchester.h library from here. Transmitting data works perfectly, 433 receiver gets data alright. ...
3
votes
1answer
421 views

RF24Mesh master-base node communication delay

I'm trying to build a mesh network using 4 nRF24L01 modules directly connected with Arduino Uno where 1 module is master node and the rest are base nodes. The workflow is exactly as follows I'm ...
3
votes
1answer
3k views

Uni-directional communication between NodeMCU and Arduino spits out garbage

I am sending data from ESP8266 (NodeMCU) to Arduino using serial and 9600 baud rate on both sides. Since it is uni-directional and from NodeMCU to Arduino, I am not using a voltage regulator and I ...
3
votes
1answer
451 views

Arduino Uno + Jaguar Speed Controller + CIM Motor (12V DC)

I have connected a CIM motor to a Jaguar speed controller, powered by a 12V battery. The Jaguar is connected to an Arduino Uno via the signal and ground. Also, I have two switches connected to the ...
3
votes
2answers
2k 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 ...
2
votes
2answers
69 views

Arduino UNO and RS485 Communication Problem

I am learning Arduino, a beginner in programming. I want to use Arduino UNO to connect a wind direction sensor RS485. The problem is the output in the serial monitor, the return data from the wind ...
2
votes
0answers
51 views

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 ...
2
votes
0answers
56 views

Problem in integrating speed sensor LM393 with L298N

I am currently working on a project that has an automatic support wheel for bicycle. The mechanism of this project is when the speed sensor is detecting the RPM of the rear bicycle wheel it will ...
2
votes
0answers
121 views

Measuring Amplitude/Frequency of sound

I need to read an analog signal at about 500-1000Hz for at least 5 seconds. I've a battery powered microphone wired into an analog and ground pin on my arduino and am trying to measure the frequency ...
2
votes
1answer
187 views

Sparkfun CAN Shield BMW OBD2 reading

I bought the CAN-Shield from Sparkfun https://www.sparkfun.com/products/13262 and I also got the Uno from Sparkfun just to be sure everything works fine. Some info about my car: BMW E91 2006 OBD2 is ...
2
votes
1answer
511 views

Arduino Uno unable to detect serial port on MAC os Mojave 10.14.2

Ive upgraded to Mojave. I've never used Arduino before. I was given Arduino Uno. Arduino Uno does not find any serial ports... can't load Blink example (the first step) In blind frustration, I ...
2
votes
0answers
254 views

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 ...
2
votes
1answer
499 views

Running two NEMA 17 motors, one by one, using the Arduino Uno

I am new to Arduino. I am trying to run two stepper motors NEMA 17 through respective A4988 driver and controlling via Arduino Uno. The thought is that first stepper motor will carry out a first ...
2
votes
1answer
78 views

Flashing ATmega8U2 using another Arduino

I have an Anduino Uno R1 and the ATmega8U2 on. It does not respond correctly. How can I use another Arduino Uno R3 in order to reinstall the correct firmware? What I want to avoid it to solder the ...
2
votes
0answers
336 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 ...
2
votes
0answers
266 views

How can i change by esp8266 baudrate, as I accidentally changed the baudrate to something else(which I dont remember)?

//In order to connect, SoftwareSerial esp8266(2,3); // the TX pin of esp8266 is connected to pin 3 of // arduino uno and RX pin is connected to 2 // we need to pass baud rate to begin ...
2
votes
1answer
103 views

Trying to communicate with an ESP8266

G'day guys, I'm trying to get an ESP8266 to work with an Arduino Uno.Here is the wiring. When I go to the serial monitor (115200 baud) and type: AT, there is not response from the ESP8266.Is there ...
2
votes
0answers
99 views

Problem with coding

Recently I got this code from a friend which is unfortunately unavailable right now. When button is pressed two halfbridges are supposed to change directions with increasing frequency of direction ...
2
votes
1answer
1k views

Laser emitter + receiver for Arduino (Arduino to Arduino communication)

I'm working on a project using 2 Arduinos connected to 2 computers to demo Serial to Serial communication. We're using Arduino Uno connected to the computer via Serial and software serial for inter-...
2
votes
0answers
220 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 ...
2
votes
1answer
2k views

How to get response of issued AT command for ES266 on Arduino programatically?

I'm successfully running AT commands via the Serial Monitor. But now I'm issuing AT commands via Arduino code and facing problems getting the correct response. Goal: After issuing AT commands ...
2
votes
1answer
118 views

Accelerometer (I2C) and Fona Shield (software serial) won't work together

I am using a Fona 808 shield with an Arduino Uno and the LSM303 accelerometer. The accelerometer is connected via I2C and the Fona uses software serial. My project requires the accelerometer to be ...
2
votes
1answer
467 views

ADS1262 and 2.2 SPI TFT (Two SPI Slave) with Arduino

I am interfacing two SPI slave module i.e. ADS1262 and 2.2 SPI TFT with the Arduino Ethernet board. When I test each device on its own it works. Initially, I interfaced the TFT to the Arduino and it ...
2
votes
5answers
3k views

MFRC522 not scanning card

So I have an Arduino Uno and an MFRC-522 reader, using a breadboard I've wired it up according to the example sketch which is the mfrc522 DumpInfo sketch. /*Typical pin layout used: * * ...
2
votes
0answers
202 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 ...
2
votes
0answers
424 views

Slow response from ENC28J60

I am making a circuit which turns a LED on and off through internet. I am connecting an Arduino to a LED and to an Ethernet controller(ENC28J60), but when I make a GET request to the device, it takes ...
2
votes
1answer
667 views

Making two Arduinos/MKR1000 communicate

I am trying to create a project in my free time just for a bit of fun - it consists of two MKR1000 (one acting as a web server connected to one laptop, and the other acting as a web client connected ...
2
votes
0answers
311 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 ...
2
votes
0answers
396 views

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-...
2
votes
0answers
524 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 --- ...
2
votes
1answer
4k views

Serial Port greyed out Ubuntu 16.04

I am running Ubuntu Mate 16.04 LTS, with an Arduino Uno R3 clone. I am having the dreaded serial port graying out problem, and have not found a solution for fixing it. Currently, The serial port will ...
2
votes
0answers
541 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) ...
2
votes
0answers
424 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 ...
2
votes
0answers
2k views

Sending data from Arduino UNO as a SOAP request

I have a servo motor on one end which can be turned ON and OFF with web service sending SOAP request. In the other end I have my Arduino UNO with ESP8266. Currently, I am able to send HIGH or LOW ...
2
votes
0answers
2k views

How to save data to SD card using Memory Shield Module SPI

I am trying to save some data to the SD card using the memory shield module that I read from HC-SR04 Ultrasonic Module. The data that gets printed indicates error. This is how my SD card module is ...
2
votes
0answers
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. ...
2
votes
0answers
378 views

Arduino Neopixel affecting IR receiver module

I have tried this on both an Arduino Uno and an Arduino Mega2560. my issue is as follows. Without a 150 LED string of addressable pixels attached, I can pretty consistently capture and read the input ...
2
votes
0answers
196 views

error with avrdude command line using arduino as isp (i think)

I am trying to upload a .hex file to my attiny85v-10pu and using my arduino as a isp (i think thats the right term) but it come up with this error. ser_open(): can't open device "lpt1": The system ...
2
votes
0answers
1k views

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

So I try to compile and upload a simple code such as the Basic Blink. I have not connected it to pin 0 or pin 1. There is an LED with the "L" label on the card that works. So I guess not the chip is ...
2
votes
0answers
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 ...
2
votes
1answer
725 views

'AttachPinChangeInterrupt' was not declared in this scope

I am a beginner trying to upload the SimpleExample328.ino sketch on my Arduino Uno. When I verify my sketch however, I run into the error: 'AttachPinChangeInterrupt' was not declared in this scope. ...
2
votes
2answers
289 views

CC3000 Wifi: Enable Debug

How do I enable debugging using Adafruit CC3000? I am using the Adafruit_CC3000_Library. I've followed the WebClient.ino example sketch. I'm able to make 300 to 400 HTTP requests, but eventually ...
2
votes
0answers
167 views

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 ...