Questions tagged [arduino-uno]

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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
58 views
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17 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
19 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
38 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
46 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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32 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
79 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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59 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
67 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
88 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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9 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
37 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
40 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
165 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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6 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
43 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
60 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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26 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
54 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
33 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
30 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
132 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
73 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 ...
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2answers
231 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
58 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
236 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
107 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
41 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
26 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
41 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
130 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
69 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
174 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
80 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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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
82 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
26 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
56 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
82 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
167 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 ...
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1answer
111 views

Why does my IR receiver spit out random codes when my motor is on?

I'm learning electronics and trying to understand why my IR receiver spits out random codes when my motor is on. I have a basic setup with this: Arduino Power supply set to 5V IR sensor receiver ...
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1answer
78 views

Arduino lack of accuracy in AD conversion

let's consider this simple piece of code: ...
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0answers
212 views

Modulate/demodulate 125khz signal to 433Mhz transmitter module (2.5Ghz carrier)

I am trying to implement a project which consists of two circuits. Circuit A receives a 125khz AM signal and modulates it to 433Mhz CC1101 which then uses 2.4Ghz carrier to send at longer distance. ...
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2answers
94 views

Clarification on adding capacitors in parallel

I have a 5 metre strand of WS2812B LEDs, at 18W per metre. I also have a 120V to 5V-30A power supply I plan to connect them to. The data pin will be connected to (for now), a PWM pin on an Arduino ...
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1answer
241 views

Arduino AREF pin

In Arduino UNO R3 official schematic the AREF pin is not connected to anything: While in most online Arduino schematics (such as this one) it's connected to a 100nf capacitor and then to the ground, ...