Questions tagged [arduino-uno]
The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.
6,657
questions
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1answer
126 views
Waterproofing Arduino
the project i'm working on is a weather station out door and for that i need to to give arduino at least some sort of protection from moisture.
https://www.instructables.com/id/Arduino-Weather-...
2
votes
1answer
105 views
OLED display hectic behavior - interference with other parts of the code?
Disclaimer: I'm a total novice to Arduino so please forgive me if the question may seem trivial, I'm trying my best to learn :)
I'm working on a small project where I have a fingerprint sensor, a ...
0
votes
1answer
54 views
How to modify this code to simulate a binary encoder?
I have come across the following SPI slave code at this site:
#include <SPI.h>
char buf [100];
volatile byte pos;
volatile bool process_it;
void setup (void)
{
Serial.begin (115200); // ...
0
votes
0answers
12 views
SIM900 can't attach GPRS
I have a SIMCom SIM900 GPRS Shield that works with an Arduino UNO R3. I am finding problems when I try to perform an HTTP POST request. I started guessing it was a problem with the GPRS because the ...
1
vote
2answers
158 views
Why are my thermistor readings backward?
I'm trying to build a thermistor that will flash an LED when the temperature is above 30 C. My set-up appeared to be reporting the room temperature correctly to the Serial Monitor, but then I noticed ...
0
votes
1answer
35 views
Need a component to connect a 9v water pump
I have a 9v water pump that i want to turn on\off from the arduino,
What module should i use to turn it on and off?
I am using now a mosfet for my 5v pump, can a mosfet be used for 9v as well? Or is ...
0
votes
1answer
34 views
How to dynamically set pinMode and dynamically write value to pins in Arduino using arrays?
I am trying to create a library called "LED" for LED Sequencer in Arduino IDE,where the user has to configure the LED pins using an array and pass it to LED constructor in program and then will be ...
0
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0answers
19 views
What is the best way to connect arduino uno with matlab ?? For my project
I conect MPU6050 sensor with arduino uno and read data 1-temperature 2-accelerometer 3-gyroscope on arduino
And i wont to send this data to matlab to draw it
What is the best way can i do that
2
votes
2answers
285 views
ignoring potentiometer value variations
I've got a 50k potentiometer connected to an Arduino Uno. The user should adjust the hue of an Adafruit NeoPixelStrip.
I've got the following code inside the loop function:
int hue = analogRead(...
0
votes
0answers
9 views
neo6m doesn't work
I'm using a NEO-6M with my Arduino Uno to get GPS data. Here is my code.
But it gives me always null. From few discussion, I came to know that - NEO-6M may take hour to boot or sync clock and it ...
0
votes
1answer
57 views
Water pump control hysteresis
I'm using arduino with analog pressure sensor, temperature sensor and a relay to control water pump. The simple code I wrote works, but I want better control.
#include <OneWire.h>
#include <...
0
votes
1answer
48 views
Controlling multiple servos as one
I want to attach multiple servos to Arduino but all them must receive same command. If it possible to connect all servos to one command pin (I don't want to use "for" in code to minimize processor ...
0
votes
0answers
27 views
Please help! My Bluetooth Controlled Car Isn't working
I followed this tutorial: enter link description here
I built it according to the schematic except I didn't connect an LED (I assume this isn't the problem). This is the schematic:
I'm a beginner so ...
0
votes
1answer
45 views
Serial communication from Arduino to ESP8266 NodeMCU works, but from NodeMCU to Arduino isn't working
My circuit connection is like: (I am following this tutorial)
Code uploaded to Arduino:
#include <SoftwareSerial.h>
#include <ArduinoJson.h>
SoftwareSerial s(5,6);
void setup() {
s....
0
votes
0answers
11 views
Arduino and EV 3 Compatibility and Simultaneous Usage
I am trying to figure out a way to build a robotic hand that goes rock paper scissors spiderman. Arduino and Minstorms are the software and hardware that I want to use. How can I use an arduino ...
0
votes
0answers
21 views
Help with turning LED on using smartphone with HC-05
I followed this tutorial: Remote Controlled LED using HC-05
I've assembled everything, uploaded the code and connected it with my phone.
The code:
/*
Arduino Turn LED On/Off using Serial Commands
...
0
votes
0answers
21 views
Characters like '$' coming through weirdly (as in '$$amd4') when sent from ESP8266 to Uno via Serial
I am running a program on an Uno using data that an ESP8266 is sending via Serial (can't run directly on the ESP8266 due to not enough GPIOs) and I'm having a problem where characters like '$' on a ...
0
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0answers
25 views
Interface gps and ultrasonic sensor simultaneously
I am able to interface gps and the ultrasonic sensor and obtain data successfully for individual interfacing with the Arduino UNO. When I combined the code for these two, I only get the data values ...
0
votes
1answer
24 views
Receiving two values over serial port using servos
So I have a java program that picks up the mouses x and y coords on the display and I would like to send those to my arduino and then move my two servos to those locations (I have two servos ontop of ...
0
votes
0answers
26 views
fingerprint sensor r307
am using fingerprint sensor r307 on my project and when l use connection from datasheet(My circuit connection is:
(Green) TX => Pin 0 [PWM]
(White) RX => Pin 1 [PWM]
//It doesn't respond when ...
0
votes
2answers
33 views
SoftwareSerial interfers with TVout
I'm using an Arduino uno and a Nodemcu for making a game with the phone as a WiFi controller.
The Nodemcu is the server that receives inputs from the phone connected via WiFi and sends to the Arduino ...
0
votes
1answer
20 views
Using Library LoRa.h with Wemos D1 R2 for Lora Shield
I have been using Lora Shield for communication between server and multiple sensor with arduino . But recently i must save data received to Cloud . So i choose Wemos D1 R2 that have similar board with ...
1
vote
1answer
55 views
Can someone help me solve a loop question and a couple others for my program?
I am currently working on the elegoo uno r3 smart car kit that uses arduino. I have written some code and it works for the most part but I could use some help. I am trying to figure out what i need to ...
-1
votes
1answer
31 views
Trying to create a delay function whilst performing other functions, using Timer.h libraries. Arduino uno
I am having a compilation error saying invalid useof template-name 'Timer without an argument list.
0
votes
1answer
40 views
Sparkfun CCS811 Air Quality Sensor is just not workin
i have an Arduino uno board and a sparkfun ccs811 sensor. I tried to reproduce the howto from the sparkfun homepage (https://learn.sparkfun.com/tutorials/ccs811-air-quality-breakout-hookup-guide?_ga=2....
0
votes
1answer
40 views
Getting an Arduino Uno and MKR zero to communicate
I'm very new to Arduino and especially the forum so please let me know if I am on the wrong topic or anything.
Anyways let me get straight to the point. I am working on a school project where I need ...
0
votes
1answer
29 views
Reset I2C connection with arduino as slave
I am currently using I2C serial communications with arduino as slave and raspberry pi as the master. I am sending sensor data from arduino to raspberry pi. I need to reset the I2C connection once the ...
0
votes
1answer
23 views
How much current needed to power arduino uno?
I am planning to build an rc car based on arduino uno. I will use 3S 11.1 V Li-po to power whole circuitry. So my question is;
First, can arduino be powered directly with 11.1V from its Vin pin? ...
0
votes
0answers
26 views
Arduino and Processing- Conditionals only executing sometimes in response to IR codes
I am reasonably new to arduino and even newer to Processing so still struggle with trouble shooting my code.
The intention of my sketch is have Processing receive IR codes from the arduino and ...
0
votes
1answer
78 views
Are there any alternatives to Tinkercad Circuits that is PC application based instead of web app based?
I have been using Tinkercad's Circuits web application to create my Arduino circuits and apply my Arduino code (c++) for testing.
Despite the amazing product they have and the fact it's free, I find ...
0
votes
3answers
86 views
pin going high not allowing analog read to change
I have the following problem:
My arduino takes analogRead(A0) from a potentiometer whose position I can't adjust directly.
When analogRead(AO) goes to a value X, I want pin 8 to go HIGH, this ...
-1
votes
1answer
35 views
Extending pulses of a square wave signal
My idea is to modify a diesel injection system to increase the fueling into the engine.
The signal to an injector is a series of 0.1-1.5ms pulses. I would like to analyse the pulses and then send out ...
0
votes
0answers
13 views
USB Host Shield: How to read output buffer regardless of key sate
I am using Arduino UNO R3 with Sparkfun USB Host Shield along with USB_Host_Shield_2.0 library.
The following code works well and I do get the ASCII clicked on the keyboard. However, as the code uses ...
0
votes
0answers
21 views
Relay controller with IO expander
found this
http://www.zevendevelopment.com/relayexpander.html
I was looking to control 48 relays in sequential order with external controls for duration and frequency. How do I properly communicate to ...
0
votes
2answers
60 views
UART communication - Serial is always empty
I have a payment terminal which uses UART (or simply speaking Rx, Tx, Gnd pins) and I have an Android tablet app which is connected to the terminal using USB to DB9 adapter based on PL2303 chip. The ...
0
votes
0answers
34 views
Control 12V power with 3 transitors to 3 seperate consumers
I have this shematic. With one electrical Pump and two solenoid valves I want to control via the arduino.
Here are the specs for the parts:
Pump: 12V max. 250mA
Valve 1: 12V max. 160mA
Valve 2: ...
0
votes
1answer
13 views
Problems integrating Reed Switch and Solenoid Lock in Arduino Code
I am trying to integrate solenoid lock, reed switch in my Arduino Code. The flow that I am trying to achieve is - first, the solenoid lock is set to LOW and then the program checks if reed switch is ...
-1
votes
1answer
36 views
SIM800L is not registering on network
I'm testing SIM800L module by registering to network manually and I'm getting an error message.
Here are the commands I tried.
AT+CSQ
+CSQ: 31,0
OK
AT+CBAND?
+CBAND: EGSM_MODE,ALL_BAND
OK
AT+...
0
votes
0answers
13 views
ISD 1820 using Arduino UNO
I have to play audio files using an isd1820 sound module. I am using arduino uno microcontroller but I am able to play only one file. Is there a way I can play different audio files according to need?
0
votes
0answers
33 views
Code Arduino project without Arduino board
I’d like to code Arduino project without Arduino board. Especially I want to run my project on Visual Studio 2019.
I already mocked a few popular function and objects and I’m already able to code ...
-1
votes
1answer
29 views
counting revolution of incremental encoder
I'm doing a project which requires me to use an faulhaber encoder,and the one i have is a 2channel 16lines per revolution.
I haven't worked with encoders before and based on what i found the lines per ...
0
votes
1answer
31 views
Running loop for a specific time period
I currently have a loop that runs without a time condition:
unsigned long previousMillis = 0; // will store last time LED was updated
int WET=4;//wet line
int DRY=5;//dry line
int Inhale=1000;...
0
votes
1answer
29 views
ESP32 access point code not compiling
I'm trying to use the ESP32 board to control an LED, buzzer, and motor (ABA) through an access point.
I got some code from this page:
https://lastminuteengineers.com/creating-esp32-web-server-arduino-...
0
votes
0answers
22 views
How to calibrate an inclined MPU 6050 on Arduino?
I'm trying to use the MPU 6050 sensor (gyroscope + accelerometer) with my Arduino UNO to get some data when walking, running and making some other moves while carrying it. The problem is that my ...
0
votes
0answers
40 views
Neopixel LED control without library
I plan to use a single address LED (SK6812 or WS2812) to indicate controller status.
The goal is to include colors: Green / Blue / Red.
There are libraries like Neopixel, Fastled, and others, but I ...
0
votes
0answers
15 views
When driving leds by TLC5940, unexpected jumping to irrelevant leds
I try to control a lot of leds separately with arduino uno. So I built a circuit that has TLC5940, arduino UNO. Connections of my circuit are like the photo. But I also add 1uF and 0.1uF capacitors to ...
0
votes
1answer
70 views
I don't know how to do the code for an rtc controlling a relay
I'm doing a project for my brother witch is an automatic watering thing,
it's all working fine but I just don't know how to repeat the code to make the relay say come on for 5min at 0900 than 5min at ...
0
votes
1answer
31 views
SIM800L GSM module is not working
I'm testing SIM800L GSM module with Arduino UNO and module is blinking 3 times every 15 seconds or sometime every 45 seconds. Why this is happening?
In serial monitor it shows Message Sent ...
0
votes
1answer
42 views
'TCCR1B' was not declared in this scope
I'm trying to use a MS5540C (digital pressure sensor)
and the sample code has this line:
TCCR1B = (TCCR1B & 0xF8) | 1; //generates the MCLK signal
I'm a bit of a noob to the IoT but its not ...
1
vote
1answer
38 views
Why Wire.write twice?
I'm checking an example for the MPU6050 and got to this part
Wire.beginTransmission(0x68); //begin, Send the slave adress (in this case 68)
Wire.write(0x1B); //We ...
