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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Arduino Motor Shield not working properly

I am currently making a project which includes a car controlled by the Arduino Motor Shield. I have written a code to control the motor shield via Bluetooth. However, the code doesn't seem to work. I ...
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493 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 ...
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888 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 ...
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217 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 ...
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197 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. ...
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548 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 ...
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932 views

Arduino Uno, ESP8266 HTTP request have no response

Firmware version AT+GMR AT version:0.21.0.0 SDK version:0.9.5 OK Connection ESP8266(ESP-01) <> Arduino Uno GND <> GND 3V3 <> 3.3V EN(CH_PD) <> 3.3V TX <> ...
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3k views

WifiEsp client TIMEOUT when put on a loop

Hello I have been using the WifiEsp to send and receive data from Thingspeak. All is well until I put my http request on the Void Loop() section. My Goal: I want to receive data every loop not on ...
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1k views

I2C requesting more then one byte

I got an Arduino Uno set up as an I2C master to an ATtiny85 slave, using the Wire (Master) and TinyWireS (Slave) libraries. Communication works good. I have been able to keep the network running ...
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38 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 ...
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285 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", ...
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167 views

Unable to send IR command

I am trying to switch the TV on using Arduino. Following is my set of code #include <IRremote.h> IRrecv receiver(2); IRsend sender; decode_results results; long repeatitions; long count; ...
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423 views

Problem with Arduino line follower

I am making a line follower robot. My code is like this #define motI1 10 #define motI2 6 #define motI3 5 #define motI4 3 int left=9; // left sensor int right=1; // right sensor void setup() { ...
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926 views

Max Sample Rate of an Arduino Uno

I am using the FFT library from Open Music Labs and I am trying to analyze frequencies up to 40 kHz. Now I don't understand fully but know that my sample rate has to be at least twice as much, but my ...
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410 views

How to read the busy flag on LCD?

I have a standard 16x2 LCD screen and I have it hooked up to my Arduino UNO via a I2C backpack (4-bit mode). Since I want to learn about the lcd at a lower level I’ve decided not to use the LCD ...
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656 views

Cannot upload sketches, and loopback test fails, but bootloader is intact and correct

I was using an Arduino Uno for a project, when suddenly it stopped allowing me to upload sketches. I kept getting the error message: avrdude: stk500_recv(): programmer is not responding avrdude: ...
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134 views

No Socket Available message floods serial monitor

Serial Monitor get's flooded with "No Socket Available" message. This seems to occur even before I Try to communicate with my Hue bridge through my hub port. Does anyone see why this is occurring ...
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518 views

Difficulty connecting arduino ethernet with PC using a switch

Facing difficulty connecting arduino ethernet(w5100) with PC using a switch (Dlink). When both are connected directly(p2p) using ethernet cable, arduino device can be pinged. However, when connected ...
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407 views

Arduino interrupt sleep mode/reset problem

I want to write a simple program that waits for an X amount of time (hours) then activates my components (LED and release mechanism) when time has elapsed. I have it so that once I press a button ...
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202 views

Arduino uno R3 Not detected in windows 7 64

i have 3 arduino uno r3 out of which 1 is not detected in any of my Pc's, i was working and must have accidentally short circuited some how , the power led and 5v regulator on uno is burnt out but,i ...
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225 views

How can I configure the RFM95 LoRa module to emit packets at only 'one' particular frequency?

I have created a LoRa gateway using a Pi3; I have used a RFM95 module for it. So, it is a single channel gateway, and I'm operating it at 868.1Mhz. But my LoRa node(also a RFM95, on an Arduino Uno), ...
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275 views

Connecting an Ultrasonic Sensor to Arduino (4-Wire)

I have an ultrasonic sensor that came with a couple of images about the pin-out and wiring diagram. I am used to the popular ultrasonic sensors that have lots of documentation about how to connect to ...
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1k views

CRC usage when ack disabled in nRF24L01

In the documentation of the nRF24L01 library I use (library), the CRC state (on/off) and length can be set or get. It seems to be used for auto ack, but when I switch auto ack off, what is the use of ...
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205 views

LED Webserver control not working

I've got an Arduino Uno and Ethernet shield, trying to test it out with a simple on off switch for the on-board LED. My Code is this // FILENAME = LED2.ino // SOURCE= http://www.instructables.com/id/...
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269 views

How can I connect a force sensitive resistor to a vibration motor via Arduino?

Please forgive me if my knowledge is limited--still very new to this! I'm currently working on my senior thesis for my Industrial Design program and I'm struggling to figure out the components and ...
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2k views

Using ArduCam library for Ov7076 camera

I am using OmniVision OV7076 camera (without FIFO) with Arduino Uno. So I want to use Github code provided in ArduCAM repository. They have provided OV7076 FIFO version straightaway but it is using ...
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75 views

Not able to read the product ID from ADIS16260 Gyroscope Sensor

I have interfaced a ADIS1620 sensor to the Arduino UNO using SPI.I am having a bit of trouble here to read the product ID information from the ADIS1620.According to the datasheet here, on page 11, it ...
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553 views

Arduino MKR1000 problem with only two HTTP Client Post Request

When I use MKR1000 with ARDUINOHTTPCLIENT library and some simple http post example I have problem that my Arduino sends the request only twice. After that I get error code in response -2. I have ...
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36 views

Programmatically activate a specific Arduino

If I have multiple Arduinos plugged into the same computer, is there a way that I can control them both with the same script while also being able to select which one I want to control ...
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359 views

1-wire bus apparently working, but OneWire::reset() fails

I encounter a strange thing. I have a star shaped topology of 1-wire devices. Every branch (there are four of them) of the star has a DS2413 and a DS18B20 at its end. The DS18B20 is supplied with a +...
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884 views

Servo motor and the servotimer2

I posted this a few days ago Servomotor and music shield and now I moving my servo motor and my musicshield (seeduino musicshield v2.0) together with and Arduino uno, in my other post they told me to ...
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423 views

SPI communication between two Ethernet Shields (W5100)

I am a newbie to the world of IoT, I want to ask... Is it possible to connect two Ethernet shields with SPI? And if yes, how can I codes them? I have reference from http://www.gammon.com.au/spi and ...
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391 views

Can't send AT comands to ESP8266 on any baud rate

I have problem with baud rate. I have changed baud rate of esp from 115200 to 9600 with AT command AT+CIOBAUD. And everything worked fine until I wanted to change it back and executed command AT+...
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218 views

ESP8266 sometimes stuck on AT+CIPSEND with “busy s…”

I'm using an ESP8266-01S Wi-Fi module on an Arduino UNO. When I use AT+CIPSEND=4 and then type test it successfully sends that message to my laptop. However, sometimes the module returns a busy s... ...
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3k views

Arduino RFID Mifare Classic dump info

I have my Arduino uno setup with RC522 reader. I am able to dump the data that is held on my test card supplied with the reader but I wish to read the data blocks held within another card I have. The ...
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179 views

Two TH02 Sensors to Grove Base Shield V2

We are trying to connect two TH02 (Grove - Temperature&Humidity Sensor (High-Accuracy & Mini)) sensors to Grove Base Shield V2 that is connected to Arduino Wifi Uno. We connected the each ...
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126 views

How can I use delimiter/split serial input in a loop function?

How can I use delimiter/split serial input in a loop function? I want to use each word from the input and check a database, to check availability. #include SoftwareSerial.h> #define ...
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851 views

'SoftwareSerial' does not name a type in Adafruit Feather M0 Bluefruit LE

I am trying to create a software serial connection between Arduino Uno & Adafruit Feather M0 Bluefruit LE. I am getting the following error in the M0 sketch: Arduino: 1.8.1 (Windows 10), Board: ...
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750 views

RFID working with interrupts

I recently created a rfid project with the sensor rfid rc522. I used the instructions mentioned by this site and works perfectly. However, I intend this project to be battery supplied and I want to ...
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1k views

My ESP8266 01 is saying at espcomm_sync failed, espcomm_open failed, and (2x) espcomm_upload_mem failed. OS X

I'm extremely frustrated at my ESP8266 right now, with the Arduino. I am using a 6v DC battery power supply (4xAA batteries), and a 3.3v voltage regulator (NTE1904). I have the connections as shown: ...
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581 views

AES 128 CBC mode Help

Firstly i printed input[16] then encrypted it and printed the cipher and finally decrypted and printed input[16] but why my result is not matching after decryption ??????? I tried with different ...
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3k views

Turn on one by one the LEDs of a Neopixel rgb LEDs strip for each detection at the same distance from an Ultrasonic Distance Sensor (HC-SR04)

For this project I seek to create a counter of water glasses we drank throughout the day. I use for this an Arduino UNO card, a Piezo buzzer and a Neopixel rgb LEDs strip (5 LEDs for this test). ...
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2k views

Issue with nRF24L01 - Module sends a message when it ought to send another

I'm going to explain better: I'm new to Arduino and was experimenting with nRF24L01 in order to make an RC controller. I have 2 circuits, one is the sender and the other one is the receiver (...
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423 views

SPI or A0/A1: what is the best solution for pin allocation on an Arduino shield?

When you design an Arduino shield you want to make it compatible with a maximum number of shields that may be stacked with it on an Arduino (UNO). Considering the following two possible tradeoffs, ...
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121 views

What kind of control method in my code will allow me to control multiple servos with phase shifts

I am building a quadruped robot, and I need to keep all four legs moving continuously and out of phase with respect to each other to produce a smooth gait and to prevent falling over. I wish to ...
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528 views

Connect Arduino + WiFi Shield to Raspberry Pi

I want to send collected data (temperature sensor) from my Arduino via the WiFi shield to my Raspberry Pi. Can I do that with the WiFi library that exists in Arduino IDE ?
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124 views

Arduino does not respond to button press suddenly

I have used this program to control relays based on commands from a serial input or control the relays with a button. Single click for a particular pin toggle and double click is like a master switch. ...
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66 views

Transferring stuff from the Uno to the Lilypad

So I have a project midprogress using the Uno and I need to move it to the Lilypad. My questions are: Will the code mostly work the same? I'm currently using this IMU chip to get data about my user, ...
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427 views

How can I implement a parking counter with multiple entrances and exit?

I'm relatively new to arduino projects and am trying to solve a real world problem on a parking lot space counter. My Idea is to have a sensor placed on the entrances and exit to count the total ...
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1answer
2k 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-...

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