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Questions tagged [electronics]

Use this tag to ask about electronics-related issues with your Arduino. For example: driver transistors, Ohm's Law, current-limiting resistors.

0
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1answer
23 views

wheatstone bridge uses question

why wheatstone bridge is used in Sensors's circuits ? i am following a course, the instructor directly said we build wheatstone bridge and started explaining it, but i didnt know we he choosed it ...
0
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0answers
24 views

Music Reactive Fountains

I want to make Music Reactive Fountain. When You say "Holaaaaaa" The fountain (PWM arduino signal) should increase making the fountain reach it's maximum height according to the amplitude of my voice ...
1
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0answers
27 views

3 phase 3 wire/3 phase 4 wire [closed]

I am looking for a circuit where I would be able to use a common circuit for 3 phase 3 wire and 3 phase 4 wire. Is there any conversion IC available? I have attached image for reference used in some ...
0
votes
0answers
76 views

Can I use ESP8266 and OV7670 to video stream on a web?

OV7670 image sensor, small volume, low operating voltage, providing all functions of a single chip of VGA camera and image processor. so I am using and ESP8266 to connect to internet and stream the ...
1
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0answers
31 views

Can I configure pairing for HC-05 and Arduino, and use the HC-05 without Arduino after?

I have a system that is outputting data via its serial, and I need to relay that data to my PC wireless-ly. If I were to setup an Arduino and HC-05 at the system's side to relay the data, that would ...
0
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0answers
56 views

How to operate a brushless motor & ESC with an Arduino

I have recently bought two brushless motors (Brushless-300w-6-5-Wheel-Tyre-Motor-Hoverboard-Swegway-Board-Replacement-Part) along with two ESC (https://hobbyking.com/en_us/hobbyking-40a-esc-4a-ubec....
1
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0answers
9 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 ...
0
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1answer
28 views

Do you need an ESC to run this brushless DC motor with Arduino Uno?

This is the motor: https://www.aliexpress.com/item/Wholesale-JGA25-2418-8-5-1977-rpm-Electric-Motors-Brushless-Motor-High-Torque-Speed-Controlled-DC/32360228129.html I'm hooking it up to the arduino ...
0
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0answers
24 views

Arduino electrical cable read [duplicate]

Guys i have been tring to make the finger sensor for my inmoov arm but i have recently run into a speed bump. So i am quite a newbie at these things so please help me out. Do you know where should i ...
0
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1answer
36 views

Trying to power multiple servos at once using a Arduino Mega

Recently I have been trying to do a project for my end of year project, it involved making a humanoid arm. I am still a newbie at these things, I usually have my friend do the wiring, but since he ...
0
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2answers
74 views

How is this simple transistor circuit suppose to work? [closed]

I've tried to replicate this circuit today. My motor is a computerfan, they apperntly don't need a flyback diode since there are no brushes. I used a 12V power source for my arduino and hooked it up ...
0
votes
1answer
16 views

Teensy not pulling down despite digitalWrite(x,LOW)

I'm trying to switch a ATX PSU on and off by serial command. My code is as follows: #include <Arduino.h> #define PIN_LOW_FOR_POWER PIN_F0 void setup() { Serial.begin(115200); } void loop() {...
1
vote
2answers
106 views

Nano damaged. Power LED OK. USB Detected. No Sketch upload. No Program running

seems i damaged one of my Nanos. i have to say i am new to Arduino and have basic electronik skills and i realized after shopping via amazon that the Nanos i have are clones with CH340G. never the ...
0
votes
1answer
23 views

Relay 24 V appliance [closed]

I want to use a switch and an Arduino to "power" a 24 V DC appliance and I am not really sure what relay to use for this. So I need the relay to be able to switch it on and off, but I have not really ...
0
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2answers
38 views

Arduino potentiometer (external power) with amplifier

i am trying to make some kind of an amplifier. I got an amp board but want to read out the value from the potentiometer. The problem is that this pot is connected to the amp and has to be connected to ...
2
votes
1answer
59 views

Newbie question - Biltong Box Project [closed]

I am a newbie to electronics, but I do have experience working with electrical wiring in the UK, so I am comfortable working with 240V reasonably safely. I have also built a camper including all the ...
0
votes
1answer
21 views

Adding POE to Ethernet Board

If I was to use the Arduino A000024, would I be able to add a POE MODULE to the board to get a Ethernet board with POE to run my arduino project?
-1
votes
1answer
28 views

how to control electric strike fail secure using arduino to secure a large box? [closed]

I wanted to use a electric strike fail secure lock to secure a box. Is it a good idea to use a electric strike or is there any better locking mechanism to secure the box?
2
votes
2answers
62 views

Arduino UNO socket

As I learnt so far is that Arduino UNO board has a socket for power input. The available power input range is between 7V - 20V, but the optimal usage range is 7V-12V. Here I am wondering: ---> if ...
0
votes
1answer
98 views

Garbage stored in SD card

I am an electronics graduate and an embedded design engineer, working in this field for about two years apart from the hobby time during my graduation. I am currently working on a system that has an ...
0
votes
1answer
49 views

Help me determine the power consumption/rating of the circuit below? [closed]

Please help me determine the circuit's power consumption from the battery and help me outline the steps to calculate?
1
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2answers
71 views

Powering Atmega328P-Pu externally [closed]

Please I'm new to Arduino and I need assistance. I'm working on a project which makes use of the ultrasonic sensor to make a certain pin high if a certain distance is attained. When I used the USB ...
0
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2answers
35 views

Schematic interpretation, where to put resister?

I'm new to schematics, trying to figure out where to put a resistor (no instructions other than the schematic) I'm told I need: 10K variable Resistor x 1, 4.7K Resistor x 1, 100 Resistor x 1 But I ...
0
votes
0answers
22 views

My 1604 LCD is bright with USB power but not when powered through the jack

I'm making a bench PSU. The Arduino runs off the purple 5v standby. The Mega also powers 2 LEDs (normal 5mm clear). The thing is, when I upload the code and watch the screen go through the process, it'...
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votes
1answer
86 views

l need to generate clock pulse with 30 Mhz using arduino? [closed]

l need to generate clock pulse with 30 Mhz using arduino ? using clock pluse to programming 32-1 multiplexer using arduino
0
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0answers
46 views

Can I output the movement(steps has done or degrees) of a stepper-motor that i manualy turned his axis?

I'm thinking for a project that involves a stepper motor; What I want to do with it is if I can somehow output the steps that has done when I manually rotate the axis ? I want to record that value ...
0
votes
2answers
392 views

Can I simulate a clock without an RTC connected? [closed]

I want to program for a timer that works as set timer such as in an oven where user can set their own time. One of the way I know is using an IC(RTC) for the timer. However, I don't have the IC yet ...
0
votes
1answer
68 views

Capacitors, Arduinos and Saving Data

In short, I have programmed and wired a speed/odometer and all is working well. However, I need to save data from the components/sensors once a power button is pressed, which has led me down the road ...
1
vote
1answer
53 views

Arduino program has suddenly stopped updating

I am writing a speedo/odometer program which was all working beautifully until I introduced an LCD screen and code for the LCD. The screen works on power up, displays the distance recorded on an SD ...
0
votes
1answer
64 views

Rc receiver giving wrong values when controlling servo

So I'm building a helicopter. That why I need a receiver (tgy 9x) to read the values from my controller. Those values get passed to my Arduino due where some calculation happen and then get sent to ...
1
vote
1answer
87 views

Arduino + Solenoid Lock

I was trying to use a solenoid lock alongside the arduino, using a 12V 2A DC adapter, TIP120, and a diode. The circuit looks something like this. However, the lock isn't going in automatically (it ...
1
vote
1answer
39 views

Formula to calculate energy required to power an Arduino board

Given an Arduino board with the following specs: ATmega328 Arduino Nano AVR® ATmega MCU 8-Bit AVR Embedded Evaluation Board (link) What is the mathematical formula to calculate how much energy/power ...
0
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1answer
62 views

Problem in bootloading 328p using Arduino as ISP. Please help me in figuring out the problem.I have uploaded the verbose below

Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Uno" C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -...
0
votes
1answer
57 views

Can someone help me with my arduino and relay and switch?

This is my code. What i want to do is activate the relay when switchInNcPin is activate. I am using a switch (micro switch). It has COM NC and NO pins. Can you tell me what is wrong with my code? ...
0
votes
1answer
182 views

Readings changing in hall effect sensor

I am using a A1324 hall effect sensor for a distance measuring. The voltage output keeps changing even if the distance between the magnet and sensor does not change. The output changes +-0.200V and I ...
0
votes
2answers
104 views

Need help with understanding the CapacitiveSensor circuit diagram

Hey guys I need help with understanding the circuit diagram from this link: https://playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense As of now, this is the schematic I drew from what I ...
-1
votes
2answers
3k views

Arduino UNO reset using SIM800L [closed]

I'm using the SIM800L module but i've problems. I'm triying to connect it to the Elegoo UNO i've, but it restarts at all times. Also the led of signal strengh blink every second, so i dont get signal. ...
0
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0answers
50 views

Need help with Arduino Love-O-Meter

not sure if this is the right place to post, but basically I am trying to make a Love-O-Meter, similar to the Arduino project example. However, my method of determining the score is different. ...
0
votes
1answer
48 views

Designing around Output pin limitations

I'm new to Arduino and am working on a project with my son. We are using the LillyPad USB board (schematic) to drive a bunch of LEDs (LED Datasheet). Our project is based loosely off of the 'Turn ...
3
votes
4answers
270 views

Why would the resistor be after the LED in this project?

This is project 2 of their official arduino projects book called "Spaceship interface". I understand resistors normally reduce voltage so the LEDs don't burnout but here 5v is coming from either ...
-2
votes
1answer
77 views

Power supply for a set of components for IOT smart switches [closed]

I am trying to build my own IOT smart home and as a first step, I used the following components to build a module to control ligts and fans: Atmega 328P - to control the 8 module relays NodeMCU - ...
8
votes
1answer
1k views

Why connect a diode between the reset pin of Arduino and 555 timer?

I am trying to create a watchdog timer using 555 IC and I am following this. I do not understand why a 1N4148 diode is connected between the reset pin of Arduino and the output of the 555 timer. As ...
0
votes
1answer
992 views

ESP8266 as wifi Card? [closed]

I am very new to arduino and electronics in general. Can i use the NodeMcu Esp8266 as one of those usb wifi dongles? I want to use it as a monitor mode capable wifi card, for my linux laptop.
2
votes
3answers
104 views

What is the most Inputs on An analog Pin with a specified Accuracy on the Resistors Used?

I am asking about the technique were switches and resistors in series are used on the analog pin, so it creates a voltage divider when one of the switches is pressed, it a well known technique it is ...
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3answers
330 views

Battery life calculation using Nano, NRF24L01+ and window magnetic reed switch

I'm trying to make my own home wireless security system. I will be using probably 3 AA batteries to power these devices. My problem is that I need to know if the batteries will be enough to power ...
1
vote
2answers
659 views

Is it possible to increase the voltage on 3.3v output to 5v on an ESP board to power a DC motor? [closed]

I am trying to use an ESP32s controller connected to an RC car DC motor. I found that when using my Arduino this is easily accomplished, and I can see that my output pin produces 5v for the motor to ...
0
votes
2answers
95 views

Unable to read data with 16 serial clock cycles

I am trying to read data from an AD7314 Temperature Sensor that is connected to an Arduino Uno and output that value onto 6 LEDs also connected to the Arduino Uno board. From the image below, the ...
3
votes
2answers
176 views

Weird Voltage Noise

I'm new to this forum, so hello to everyone out there. So I have an Uno with A0 connected to the positive end of a chain of LEDs (they light up when a motion sensor goes off, clunky, but it works), ...
0
votes
1answer
843 views

SPI Temperature sensor interface with Arduino Uno

I want to interface with an AD7314 Temperature Sensor. I want to only read the temperature value from the sensor and output the value on to 8 LEDs connected to the Arduino. But so far I have not been ...
0
votes
2answers
309 views

How the output of a bicycle dynamo can be displayed using Arduino?

I am on a project in which I need to make bicycle dynamo frequency meter. The power generator’s output should vary with the speed of the wheel. Which parts do I need to make it work? The project ...