Questions tagged [arduino-uno]

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Arduino reboots or Hangs Up: Memory/Stack problem?

Using an Arduino Uno. Code runs fine for long periods of time and then either reboots or hangs up. Sometimes problem happens soon after power up. I have been researching causes on Stack Exchange, and ...
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2answers
156 views

Burnt uno A0 pin!

I was making a voltage tester with the Uno and the input was A0. When I went above 10 volts into A0, that pin stopped working. Is it possible to fix the pin? If so, what do I do?
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1answer
30 views

Advice on Arduino project for smart light bulb planning

I'm starting a new project (for personal use), I want to build a circuit that will enable me to control a lightbulb through my phone. I want to use it as an additional lighting at my living room. ...
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26 views

Arduino UNO TMC2130 and Nema 17 Motor

I currently have an Arduino UNO, a stepper driver (the TMC2130 v3.0), and a Nema 17 stepper motor. I was trying to find the correct way to wire the driver and motor to the Arduino in order to simply ...
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35 views

error in DHT11 senosor reading values

Hello guys, I'm creating automatic mini greenhouse using Arduino Uno board on proteus. After compiling the code on Arduino no errors appeared, but after applying the code on proteus with the creation ...
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2answers
51 views

Reading sketch from Arduino UNO

I'm new to Arduino and spent shockingly long on an RFID code variant. Unfortunately someone then snuck into my flat and nicked my laptop. The sketch however is still on my Arduino UNO, is there a ...
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1answer
63 views
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1answer
25 views

PROGMEM problem with my project - dynamic allocation error

My project is and RTISR (Real Time Instant Signal Recognizer). I'm sampling a signal from PIN A0 in the Arduino, and I have 6 types of Signals which I compare with (using squared cross correlation to ...
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0answers
23 views

Load Cell Decreasing Output

I built the following weight system using a Load Cell and Hx711. I am using an Arduino UNO and running the calibration sketch in HX711 library. However, I noted one interesting behavior that you ...
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2answers
40 views

Arduino UNO analog input pins

I'm a student working with the Arduino UNO There's this question always bugging me for the analog input pins, how many samples does it take per cycle. I know it has 10 bit resolution meaning 0-5v ...
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1answer
48 views

Help for checking if PID code

I am designing a PID temperature controler; as far as I managed to write it so far, you find the code below. Can you please help me check if Integrator wind up and other PID elements are configured ...
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0answers
33 views

Programming Arduino Nano through Arduino UNO

I am trying to Program arduino Nano using ICSP but the problem is uploaded program only works as longs as Nano is connected to UNO. Here is what i am trying. Upload arduinoISP program in UNO. Make ...
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2answers
82 views

Is it possible to generate a sine wave formula using values from an array?

so we have an Arduino code which includes an array, is it possible to make those array disappear [in the code] and instead formulate a sine wave formula for those [array] to make the output in sine ...
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1answer
19 views

GSM SIM800C not responding

I'm using Arduino IDE software Arduino Uno board GSM SIM800C BSNL 4g SIM card Interfacing RX (of GSM) to PIN 2 (of Arduino) TX (of GSM) to PIN 3 (of Arduino) GND to GND Power supply For Arduino - ...
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0answers
60 views

I am not able to control speed of a DC motor

I am making an Arduino project in which I have to control speed of DC motor with an ultrasonic sensor. I have written an Arduino program to do this work but unfortunately my motor only rotates in ...
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1answer
96 views

I2C master's output is always 255

We are using two Arduino UNOs as a master/slave for this I2C protocol. We used the first Arduino (slave) as a sensor that will input dummy data (in this case, temperature data). The Arduino (master) ...
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1answer
89 views

Controlling hundreds of motors using an arduino uno

I'm trying to build a haptic feedback suit, which requires me to control over about 576 vibration motors (24x24), using an arduino uno. I have no idea how to do this because the uno has only 13 gpio ...
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10 views

Interfacing Problem with 16 MG996R servos

I am using 16 MG996R servo motor with PCA9685 servo driver and Arduino Uno, but the motors are not working properly.It works well a Month ago but is not working now. The servo only twich a little when ...
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1answer
50 views

Pull Up Resistor Value for temperature sensor

I read that there needs to be a pull-up resistance for dht22 when connected to arduino. When dht22 is close, arduino's internal resistor value is enough, we have to add external resistor. I want to ...
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1answer
50 views

continuous rotation of servo problem

I am making a solar tracker using MG995 servo motors. The problem I am facing is that as soon as I run the program the servo starts continuously rotating. Can someone please help me to figure it out?...
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3answers
173 views

getting interrupt from ignition circuit

This transistor ignition circuit for a model petrol engine is built from a proprietary kit. I have made it up and it works. Now I want to take a signal from it as an external interrupt to an Arduino ...
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0answers
7 views

16 Servo interfacing using Arduino Uno and PCA9685

I am using 16 MG996R servo motor with PCA9685 servo driver with Arduino Uno, but the motors are not working properly. What is the best power supply/battery for my project as it worked well earlier but ...
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2answers
49 views

How do I turn off this constant current load circuit with a Arduino gpio?

I need to turn off this constant current circuit with a gpio pin when an event is True. I'm using 6 of these circuits with 3 lm358 op-amps, so turning off the whole chip is not an option. Any ideas?
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1answer
71 views

How to use pir motion sensor to light up 3.8v dc bulb using battery and relay

I would like to detect motion to turn off my 3.8v 0.3A dc light bulb using pir motion sensor. Recently I tried to connect it with 5v relay, arduino uno and 2×3.7v li ion battery and the bulb seem to ...
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0answers
27 views

CT or Hall sensor to measure small current?

My project is an energy monitor(my grid is 127V/60Hz), based in Emon lib + Arduino UNO. I want to measure currents from 50mA - 25A due my range of different loads, I have a CT 30A(SCT013) working fine ...
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1answer
59 views

RPM Gauge Arduino… Need the explanation of the Zener diode, what is the fuction on this circuit

Hello everybody... I need the electronic explanation of Zener diode.... I researched the Zener Diode I understand how it work .... But still don't understand the relationship with the zener with ...
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1answer
35 views

Interfacing Arduino for variable power supply

I'm a mechanical engineering student with no knowledge on Arduino microcontroller. I am currently working on a project of using Artificial Neural Network in a hybrid solar heating system. The hybrid ...
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0answers
13 views

Confusing timing diagram for QCIF format in OV7670 datasheet

Any reply is greatly appreciated. I wanted to confirm about the QCIF timing diagram from datasheet (shown below). The ON time of the HREF for both vga and QCIF is shown as 640tp (tp=2tpclk). So does ...
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1answer
32 views

5V and Vin pin in Arduino UNO

I am trying to control the speed of a DC motor by using H-Bridge and Arduino UNO. The initial supply is 110 AC which with the help of transformer and a full wave rectifier circuit is converted into ...
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2answers
136 views

Why add resistors to a Transistor Vin and GND

I am following a tutorial where the author uses an infrared sensor (L-51ROPT1D1 on the left) as an input to an arduino GPIO. I am not using the emittor on the right, I am only using the receiver to ...
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1answer
51 views

Need help with power supply in my project

I am a mechanical engineer. I need some help with my project I am building a water sampling device that has 11 solenoid valves and a vacuum pump to distribute water to various containers on the device....
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1answer
120 views

Does the MPU9250 require a 5<->3V3 level shifter when used with Arduino Uno?

this is a quick question. I'm building a flight tracker which uses several breakout boards. Most of which operate a 3V3, hence they require level shifters to be able to work with the Arduino without ...
3
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2answers
242 views

Will this photodiode circuit work?

I'm relatively new to electronics. I've seen a few circuits online, I just wanted to check that this schematic I drawn would work. The purpose of the photodiode will hopefully be to read a modulated ...
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1answer
59 views

I want to use the following command (PINC & B00000011) to read 6 different conditions from hall effect sensors

I need help with this code. I don't understand why it doesn't execute all 6 conditions. I am using PINC which is PORTC (A0-A5) on the Arduino Uno to read in 3 hall effect sensors from a BLDC at the ...
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2answers
248 views

Can we use pir sensor while it's moving?

I fixed the pir sensor on the top of servo motor.while the servo motor's rotation the pir was also rotated by servo motor's motion.but the problem I had founded that pir sensor had always indicated ...
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3answers
108 views

Where do I code for the Arduino? How do I decipher the code? I am quite lost for Arduino [closed]

How do I make use of the code? Where do I code it?
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1answer
53 views

relay voltage drop

I made a simple ultrasonic project with Arduino. Used an LCD to show the distance. Also I want to turn a LED on with a 5V relay with a switch for some reason. I'm using external power supply 7.5V 2A ...
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1answer
32 views

Driving an Adafruit motor shield and a bluetooth module with Arduino Uno

I am creating a simple 4 wheel robot (BO Motors 200 RPM) with Adafruit Motor Shield and Arduino Uno V3. I am trying to use a Bluetooth module to control the robot. However, unlike Mega, I do not have ...
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1answer
48 views

Can we use nodemcu in real-time projects [closed]

I have been working on some small iot projects using nodemcu. So I have an idea to make those nodemcu projects into real-time . The places like home, office, school
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3answers
151 views

Interfacing LM19 temperature sensor with Arduino

community! I have a problem as follows. I've been trying to interface the LM19 temperature sensor using Arduino. I made a function to read and compute the temperature from the sensor according to a ...
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1answer
120 views

Battery connected to TP4056 will not operate load

I have a simple circuit with an Arduino board (load in the diagram) that I want to power using a solar cell via a TP4056 board. The 18560 Lipo battery is for powering the Arduino during night time. It ...
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1answer
229 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
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2answers
87 views

Can LM35 temperature sensor be used to measure temperatures in bone in an in vitro setting? are they comparable to K type thermocouples?

I belong to the medical field. I have zero knowledge about electronics. For my thesis, where I will be measuring temperature within the bone during drilling, I am required to use a temperature sensor ...
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0answers
40 views

How to measure impedance of sensor's traces?

I'm designing a humidity sensor as a semester project and I want to measure impedance of these traces: I don't have specialized impedance measuring instruments for this. As I'm thinking, this should ...
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0answers
88 views

Addressing the RAM on the DS1302 RTC timer chip with an Arduino

I'm trying to access the RAM of my DS1302 RTC chip. According to the data sheet, I need to clear bit 7 of the control register. The control register can be accessed at address 8Eh. To test this out, ...
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1answer
34 views

VNH5019 motor controller

So I want to use the VNH5019 motor Controller shield for the Arduino Uno for a project. My question regarding this is the voltage of the motors. Since they differ from motor to motor I'm not sure ...
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0answers
43 views

Software to detect certain sounds?

I’m trying to incorporate into an arduino, some programme to light up an LED when it hears certain sounds. Basically Shazam. This app uses the fourier transform to break down songs into frequencies ...
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1answer
71 views

Combining multiple bar type load cells to measure large weights

This is my first post here. I want to make a scale that can measure weights up to 60kg. I have three 20kg bar type load cells. I can successfully measure weights with the load cells individually (just ...
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1answer
99 views

MAX7219 led matrix prints unwanted artifacts when it is powered up

I’ve got Led matrix 32x8 which is driven by MAX7219. Like this: MAX7219 Dot Matrix Module Microcontroller 4 In One Display with 5P Line When I power it up, I can see different glitches. How to power ...
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1answer
232 views

Initializing to MicroSD Card with Arduino produces error code 0x43, 0xff

I am trying to interface with a 32GB MicroSD card with an Arduino Uno, but the code consistently fails at the initialization stage. Below is my schematic (sorry for the horrendous schematic, I'm not ...