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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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 ...
4
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1answer
69 views

SPI between Master arduino and Slave arduino

How can I send the string from Slave SPI to Master SPI? I want to write code in Bare Metal. The problem which I am facing is I can't make out what will be my blocking function in Master SPI code when ...
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0answers
388 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 ...
4
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1answer
3k 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 ...
4
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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 ...
3
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0answers
57 views

Can't sync with programmer — but weird

I have a weird problem, and it's probably because I'm doing something wrong. I'm quite new to Arduino. My Uno R3 (Elegoo) has been working fine for a month. It has been sitting on a bench for the past ...
3
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0answers
65 views

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
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0answers
206 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
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0answers
144 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
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0answers
693 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 ...
3
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0answers
86 views

Problem with incrementing values of an RGB LED

I'm trying to use a remote control to control the red/green/blue values of an RGB LED using an Arduino Uno. Here's what I've got so far: #include <IRremote.h> #define IRPin 7 #define bluePin 9 #...
3
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1answer
3k views

Using signal strength feature of nRF24L01 module

This is a walkie-talkie project and this circuit really worked, voice can be transmitted from one nRF module to another nRF. Additionally, I want to observe how well the signal strength is, by ...
3
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0answers
292 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 ...
3
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1answer
2k 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
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294 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 ...
3
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0answers
324 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 ...
3
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0answers
539 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-...
3
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0answers
633 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 --- ...
3
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53 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
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631 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
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0answers
447 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
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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. ...
3
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0answers
250 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 ...
3
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0answers
179 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
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0answers
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
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0answers
780 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
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0answers
1k 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/...
3
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0answers
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
1answer
1k views

How to send HTTP request to specific port using Ciao?

I currently have a working REST client on my arduino, but the requests always go to port 80, how do I make it send the request to a specific port? This is my current code: /* File: RestClient.ino ...
3
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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
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0answers
32 views

Real range of long range transceptor LORA RA-02 SX1278 with Arduino UNO

I'm working in a project where I have to send data from long distances (about 1 km) between 2 Arduinos UNO which are powered by computer's USB ports. The place is a small city with no large buildings. ...
2
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0answers
46 views

Checking if Arduino board works or is damaged

I have an Arduino Uno and Mega, but when I connect them to a computer with the USB they came with, there is no green light near the reset button that illuminates. On the Uno board the pin 13 ...
2
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0answers
57 views

Universal remote control with bluetooth emitter

I am creating a universal remote control to replace multiple devices I have at home. The IR part was quite easy to implement. I realised then that the Chromecast with Google TV remote uses Bluetooth, ...
2
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0answers
33 views

Converting Arduino code to Node MCU code

I'm doing a project on controlling my house appliances with Blynk app and a ir receiver.So basically i can control my lights and fans with The Blynk app and an IR remote as the one used for TV. So i ...
2
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0answers
114 views

Not Able to communicate with ESP8266

I just bought an Esp8266(not the node MCU) and tried connecting it with Arduino without a USB to serial converter but in vain. I am a beginner and don't know what to do. It is not responding to AT ...
2
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1answer
61 views

Analog input voltage rises when motor is working

I'm making automatic water plant system. I'm using: Arduino Uno 3.3-6V water pump -https://www.amazon.com/Vipe-Micro-Submersible-Motor-Water/dp/B01N0X3CW4 Capacitive soil moisture sensor - https://www....
2
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1answer
47 views

How to separate a specific frequency signal from a summation of a few signals?

I want to calculate THD. SO how do I isolate the fundamental frequency from a signal with harmonics? I have a signal V which is a sum of V1, V2 and V3. V1=A1sin(w1t+phi1), V2=A2sin(w2t+phi2) and V3=...
2
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2answers
58 views

Connect 5V relay to ESP32 WROVER B board

I need to use a ESP32 WROVER B based MCU board with a standard (cheap) one-channel 5V relay (e.g. to switch on a mains-power appliance). Attempted removal of excess solder around the headers ...
2
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0answers
29 views

CAN bus communication and LCD updation

I am trying to communicate arduino uno with CAN bus using MCP2515 shield. Data sending and receiving both things are done. Whatever data received is displayed on LCD. CAN bus receive is done using ...
2
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0answers
42 views

Two LED Patterns Task Controlled by GUI

I am very new to Arduino and coding/programing. I set a task for myself to make a simple circuit of 5 LEDs controlled by pins 2, 4, 8, 11, 12. I want to be able to make two different pattern for the ...
2
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0answers
49 views

Why doesn't LCD 16x2 work with fingerprint sensor code?

When I separate fingerprint code and LCD code it works fine. sensor read 6 templates which I already stored 6 fingers ID. When I combine the code it read 0 templates. #include <Adafruit_Fingerprint....
2
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0answers
47 views

Sim800L-v2.0-network-problem

I am having trouble to get Sim800L-v2.0 to work. I believe that I am supplying the necessary amount of current (5.0V, 2.1A máx power source, using solid copper wires - circuit photo). The Net LED ...
2
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1answer
45 views

TFMini Sensors with Arduino

I have three TFMini sensors I need all of them to detect. I only got one to work , pins 4,5 . My info in coding is basic . I really appreciate your help . Thanks in advance. I think the problem is ...
2
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0answers
65 views

Reading JSON from Arduino over serial in python and writing to a JSON file on computer

I'm fairly new to Arduino so I used a sample code before integrating this into my main code. I'm printing my value in a JSON format over serial. My Arduino outputs this and the python receives this ...
2
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2answers
86 views

Running an Arduino without the computer

I am having trouble getting my Arduino uno to run my code when I disconnect it from my computer. I have a 9V battery to power it and it is turning on, however, it is not doing anything at all. What ...
2
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0answers
49 views

How can you turn off the LEDs on a SparkFun AS7265x Spectral Triad (Spectroscopy Sensor)?

I'm a newbie to program an Arduino but I need to turn off a LED from a external Spectroscopy Sensor. This is the Sensor: There are three LEDs on this sensor and they're turned on automatically when ...
2
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0answers
23 views

Brushless motor vibration/jitter/noise - arduino uno

I am currently using these motors and driving them off these drivers and an arduino uno, and alternatively trying to make them turn using the setup in step 6 (both with l298n and without) in this ...
2
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1answer
49 views

How can I use both ultrasonic and IR sensor and ultrasonic sensor at ones with Arduino

I want to use both the ultrasonic sensor and IR sensor with Arduino + motors for a car project. Will I have to do any kind of multithreading on Arduino, or is it something else
2
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0answers
58 views

Please help with my tinkercad code. Debouncing stopwatch with lcd

#include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int ssPin = 8; int resetPin = 9; bool cntrRunning = false; int sec = 0; int min = 0; double currentMillis; void setup() { ...
2
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0answers
29 views

loop once per startup for stepper motor

First of all sorry that i dont know much about programming, most of my codes are just copy paste. And of course, i know this question has been asked before, but while using this code: #include <...

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