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 ...
3
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0answers
306 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 ...
3
votes
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
281 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
1k 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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0answers
257 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
510 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
629 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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0answers
624 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
444 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

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
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
231 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
176 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
778 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
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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
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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
24 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 ...
2
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2answers
1k views

How to use external libraries in CLion

I would like to use the external libraries that are downloaded by Arduino IDE into the default sketchbook location (~/Arduino/libraries/). If you open Library Manager in Arduino IDE and if you ...
2
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0answers
100 views

qMenuSystem using DigoleSerial library doesn’t work on my I2C Monochrome OLED

Just like the title says I’m trying to make qMenuSystem to work with my oled display. Here is what I know so far about my display : - It's a Monochrome OLED 128x64 (Blue) Display - It's connecting ...
2
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2answers
2k 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
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0answers
124 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
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0answers
419 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
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0answers
589 views

Arduino + USB Host Shield + ESP8266

I am using an Arduino Uno and a USB Host shield for Barcode Scanner. The whole scenario is that when I scan the barcode through USB Barcode Scanner, it scans and gives a code. Now the question is how ...
2
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0answers
23 views

Selection of External CT for my application

Here I have attached my ckt for my application. My application is Motor protection Relay. Based on Current sense of 3 CT tripping of relay will occur. Tripping might due to under/over/SC/Locked rotor ...
2
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0answers
215 views

Ideal voltage level for attachInterrupt()

Well I am working on old textile machines, it is taking motor RPM with ISR. I want to read this RPM and publish on web. but the output voltage of this old system is 0 and 22 Volt. (0 Volt when the ...
2
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0answers
328 views

Seeed CAN Shield - Not receiving extended CAN-Message

I want to receive an extended CAN-Message. I send a extended CAN-Message, but nothing happens. Maybe somebody have an idea what the problem is.. It works with a standard CAN-Message. Thanks in ...
2
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0answers
566 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
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0answers
368 views

Arduino Modbus slave error

I am trying to use Arduino as Modbus- RTU slave and Raspberry Pi as a Modbus master I have interfaced Max485 (RS485 to TTL converter) with Arduino and Rs485 to USB converter in Raspberry Pi, Initially,...
2
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0answers
77 views

Arduino Swissflow Meter

We've hooked up a Swissflow sf800 flow meter to our Arudino Uno. The system works, our interrupt callback is triggered and as water flows through the metre, it counts up. The issue is, that the pulse ...
2
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0answers
73 views

TLC5917 SPI Speeds

I am attempting to use 3 x TLC5917 chips to drive a row of LEDs in PWM. The LEDs share a common anode being powered through a transistor, with each LEDs cathode going to pins on the TLC5917 Chips. ...
2
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0answers
99 views

TM1638 making high pitch sound?

I have a TM1638 board with 8 seven-segment displays, 8 LEDS, and 8 buttons. Each time multiples leds are on, the board makes an annoying high pitch sound. I'm controlling it with an Arduino Uno. ...
2
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0answers
75 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 #...
2
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0answers
37 views

Arduino Uno with data logging shield has a problem switching power sources

I have the basic Adafruit "Light & Temperature data logger Tutorial kit" made, and it works well when connected to a PC, but when I unplug the PC USB connection and hook it up to another power ...
2
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0answers
2k views

Reading +IPD response from serial.read() using Arduino UNO and ESP8266

I have a python server running on my PC and I am using an Arduino Uno (wifi enabled by a ESP8266 chip) as the client. I can make the the server and client communicate using AT commands as shown below: ...
2
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0answers
49 views

Can only upload certain programs to standalone Arduino

I can't upload a program that uses digitalRead, analogRead, and Serial.print on my standalone Arduino, because I get this error: avrdude: stk500_recv(): programmer is not responding avrdude: ...
2
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0answers
76 views

SD card doesn't work properly

I have this SD-card module. I have formatted the SD with this tool. My problem is that the Arduino Uno can't initialize the SD. I tried with this script: // include the SD library: #include <SPI.h&...
2
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0answers
1k views

NFC PN532 SPI - Error: Timeout when waiting for ACK

I've been struggling to get the PN532 module working over SPI with an Arduino Uno. I have the wires connected as follows: SCK -> 13 MISO -> 12 MOSI -> 11 SS -> 10 VCC -> 5V ...
2
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0answers
2k views

Send Bluetooth Data to Android App (HC 05)

I'm struggling to send data strictly from my arduino UNO to an android app using bluetooth module HC 05. I am able to send/receive using 1) the serial monitor in arduino IDE and 2) Bluetooth Chat ...
2
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0answers
111 views

What might be the errors of my codes?

I tried to imitate lagsilva's clock projects using Arduino Uno and made the circuitry, then I've tried to upload the main source code of the author but noticed that it didn't work, so I've edited the ...
2
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0answers
832 views

NRF24l01+ works only when touching its antenna

I have two simple NRF24l01+ (with range of 200m) and two NRF24l01+ with range of 1km.and two socket adapter. or what I have and I have two good library with names RF24 and RF24-master . problem ...
2
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0answers
503 views

Soil moisture sensor problem

I'm having a problem trying to run a bunch of code, using an "if" state which uses a variable which should get a value from a soil moisture sensor. I'm using the sensor digitally, so it should just ...
2
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0answers
897 views

Serial Port Issues Elegoo Mac OX High Sierra

Edit: Unfortunately the question that has been linked to my question does not answer my question. I have followed its instructions but it is a slightly different issue. Any help on my question would ...
2
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0answers
219 views

Stepper motor just oscillates with arduino and L293D

I am trying to control my stepper motor using arduino duemilanove, with L293D as H-bridge. I use a NEMA 17, stepper motor 42BYGH-036B I have used both the default example program from arduino IDE, and ...
2
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0answers
201 views

Sparkfun Spectrum Analyzer: Problems with frequency bands

I bought around 2 years ago the Spectrum Analyzer Shield from Sparkfun, but I never had the time to do something with it. Recently I found the time to start a project to build a graphical equalizer. ...
2
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0answers
560 views

Error while creating file on sd card

I want to create a file and read it form sd card by arduino. I have used sd card module. I have used this following code. In serial monitor it says "SD card is ready to use." But it can't read or ...
2
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0answers
40 views

How can i tell the power status of a GSM900

What I am after is a reliable way of telling whether the GSM900 shield is powered up or not. "Obviously" the shield power is the constant green light. But i'm talking about the red light on the ...
2
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0answers
290 views

Arduino Fails to Read Thermocouple on External Power

I'm having what I believe to be a power issue with an Arduino project. I've tried 3 different power supplies (all separately): My computer via USB B A 5V USB "outlet" via USB B A 5V USB "outlet", ...
2
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0answers
450 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 ...

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