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.

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32 views

Control D+ and D- USB lines using an arduino disconnect/connect

I am using Arduino to remotely trigger a shutter action. All is well, until I hook up a USB cable on the 4 regular USB pins. This cable runs between a Sony camera and a printer. But I can not take an ...
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0answers
28 views

How to make a chain data transfer from one microcontroller to another!

I am trying to create a chain data transfer where data is collected from one microcontroller to the next and then it transmits the data of the previous microcontroller which it collected and the its ...
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1answer
33 views

Is it possible to use a slide switch without a resistor?

I understand how pullup and pulldown resistors work with push buttons and I also understand that an analogous idea can be applied to slide switches. Furthermore, I know that some versions of Arduino ...
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2answers
124 views

As a novice, how do I program my Atmega328p?

I bought a board which the above MCU is the atmega328p. Since I haven't used atmel MCU before, now it's a bit confusing. Are the ATMEGA and STM32 programmers not universal? What programming methods ...
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1answer
40 views

Pulsing 3v into a capacitor to create custom Voltages

I was wondering if it is possible to create diffrent voltages by just pulsing power into a capacitor, Im using an esp32 which can only output 3v or nothing on its GPIO pins, and i need to make it ...
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1answer
74 views

How to calculate required amperage of multiple motors?

I a very simple question about calculating the amperage I need to run 5 stepper motors from my Arduino Uno. If I have 5 28BYJ-48 stepper motors(which are 5V and are said to require about 240mA each) ...
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2answers
119 views

Best way to add external power supply when main PSU is a solar charge controller?

I have a 12V 20A Solar Charge Controller (which is part of my existing Solar Panel System Setup connected to a 12V Sealed Lead Acid Battery) that I will use to power up some pumps with the help of ...
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2answers
80 views

Electronics Laboratory

I would like to know if someone could explain to me how to create an arduino electronics laboratory with soldering iron etc. with a low budget <3
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0answers
63 views

Arduino pull-up resistor not working

I made a circuit where when I press a button, a LED lights up using a pull-down resistor. But when I tried the same with a pull-up resistor instead, the LED remains off (whereas I expected it to be on ...
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2answers
194 views

I'm working on a NodeMCU project and have a small doubt about LEDs and resistors

In my NodeMCU I want a statement to turn on an LED, which is easy, just use pinnumber, HIGH. But, what I'm trying to do here is connect multiple LEDs to one pin like this: I just wanted to know if ...
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1answer
229 views

Can i connect in pin of relay module to Analog pins of arduino instead of digital pin?

Im a complete beginner Im making a project using relay modules and arduino. but all the digital pins of my arduino are filled. I wanted to ask if i can use the analog pins to connect my relay module ...
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1answer
617 views

Which relay module to buy and what is the difference between 1 channel and 2 channel relay boards

I wanted to d a simple circuit using Arduino to control the lights in my house. But i do not know which relay module to use my house runs on standard 220v ac. Can anyone tell me weather this relay ...
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1answer
20 views

Different Output Voltages from Same Source?

I'm wondering whether it is possible to wire multiple buck converters with different voltage requirements and amperage draws to the same power source (this idea is for controlling a radio-controlled ...
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0answers
64 views

Testing of voltage level converter with arduino

I am having a problem I am testing logic level shifter https://ewall.com.pk/product_view/IIC-I2C-Logic-Level-Converter-Bi-Directional-Module-5V-to-3.3V/910. I have followed the procedure as given in ...
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1answer
97 views

Are the GND pins of an Arduino identical to GND of its power supply?

What would happen if I connected a fan as shown in the following picture: +12V is supplied by the power supply that also powers the Arduino. GND, however, is connected to a GND pin of the Arduino ...
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1answer
44 views

Is it possible my ATMega is burnt due to bad wiring?

While working on a project I tried sending data from my Arduino NANO to ATMega64 placed on AREXX Robot arm PCB via TXD/RXD. After plugging in VCC, GND, TXD and RXD to UART socket it didn't work so I ...
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0answers
71 views

How to test continuity on signal wire?

I’m reassembling an LED strip, SK6812, that I had cut into smaller lengths. I don’t have a lot of faith in the connectors I’m using or my ability to solder, so I’d like to test it before I put power ...
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1answer
108 views

Arduino "Maximum Power point tracker" (MPPT) Problem

I need an IV curve for a solar panel. As far I know, solar-panel and Diode IV curve pretty much the same. Here, I am using diodes(6A10-1) as a solar-panel. Where each Diode voltage drops 0.6volt. I ...
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0answers
218 views

My nodemcu esp8266 is heating a lot and the on board LED of gpio16 is On continuously. What's the Reason of heating?

How it happened Recently I was working on a device with Blynk application in which my device will burn crackers using Blynk. I wanted to create a safe environment for burning crackers. There was a ...
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0answers
27 views

How can I power off a servo the best way? Problems with MG90S servo [duplicate]

I have a NodeMCU and im trying to control a servo to move from angle A to B and viceversa. The thing is I want to be able to power off the servo after moving so it could stop getting voltage and ...
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0answers
29 views

Using Flexinol Or Muscle Wire To Control Paper Flower Petal With Arduino

I am relatively new to Arduino and I am looking to use flexinol or muscle wire to control flower petals. I think I will need to control 4 sets of the wire. I have totally no idea of how to wire the ...
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1answer
35 views

AMIS30543 | DataSheet Understanding CIRCULAR TRANSLATOR TABLE

I was reading the data sheet of AMIS-30543 stepper motor and I didn't understand fully what does this Circular Translator Table means, I have a couple of doubts What does Circular Translator table ...
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1answer
15 views

AMIS30543 | Data-Sheet understanding Status register

I was reading the data Sheet of AMIS-30543 stepper motor driver and I was not able to understand how to combine the result of the Micro step position status register MSP[8:0]. I know that its a 9 bit ...
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2answers
38 views

AMIS30543 - Library code | Order of pinDirection and pinOut

This piece of code was taken from AMIS30543- Arduino library, void init(uint8_t slaveSelectPin) { ssPin = slaveSelectPin; digitalWrite(ssPin, HIGH); pinMode(ssPin, OUTPUT); } Facts I know ...
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0answers
41 views

Esp32 heating slowly

I made a small little IoT device to control my light chains from my phone, I'm using a MOSFET to turn the power on or off, using an esp32 connected to the MOSFET, both esp32 and light chain is ...
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1answer
68 views

status whether the switch is connected to arduino or not?

I made a small circuit in which a push-button is connected to Arduino via a pulldown resistor. So, whenever it is pressed it connects to 5V otherwise pulled down to the ground. this is working fine ...
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1answer
453 views

How to burn the bootloader and upload sketches on ATmega328P U (specifically this model)?

Recently I started to learn embedded electronics and C/C++ and for a couple of days I tried and I am still trying to burn a new ATMega328P U bought from Aliexpress. From what I know new ATMega328P's ...
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2answers
436 views

What exactly does the return type do in a function?

something I've never understood and still don't is, what does the return type do specifically? Everyone in tutorials just say that void returns nothing and int returns int, etc. But what does that ...
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1answer
72 views

Is this circuit risky for an Arduino Uno?

I will show a connection diagram between my Arduino Uno and a DSC HS2032 panel (alarm system). The DSC panel uses 12V and I don't know the voltage fluctuation. The yellow and green are RX/TX ports. ...
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0answers
33 views

Calculating the Distance between a Special Object and Center

I just want to detect a small object specified in the system and show the distance between it and the object. If I need to explain briefly; I want to detect a small object that I put on the foot of a ...
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0answers
53 views

esp32-pico-4d not working

My power supply is feeding the esp32-pico with 5v tho it says that there is 0 amps power drain, already there I know something isn't working since the power drain should be around 0.080amps, (it can ...
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2answers
646 views

Antenna for ESP32-pico-d4

I am currently playing a bit around with the esp32-pico-4d, it does not have an onboard antenna, so an external antenna is needed, tho I don't know a lot about it so a little help would be appreciated....
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2answers
1k views

How do I know if I need to use a resistor in a circuit?

I have been trying to find answers on Google to this question but cannot seem to find any answers that actually pertain to what I am wanting to know. I would consider myself a beginner in the area of ...
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1answer
103 views

NodeMCU Power supply

I got a question about externally powering my NodeMCU V3. It has an onboard voltage regulator (3v3) which breaks out to 3 header pins. Now I want to power 3v3 from an external board. Can I supply 3v3 ...
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1answer
177 views

Connect multiple pins to same VCC using breadboard

Ok so I am pretty green as far as AVR programming is concerned so bear with me. I am doing a project with an ATmega32 MCU on a dev board which has 4 VCC pins. The project includes a GPS, SD card and ...
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1answer
94 views

Soil moisture sensor, weird readings

I'm having a small problem with my soil moisture sensor it gives me weird readings, in the second the smallest connection is made between the legs it just gives me 4096 (which is max possible value),...
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2answers
190 views

Check if the board is in sleep mode

I'm using seep sleep mode with UNO with a simple sketch that turning on an LED and then goes to sleep. as far as the ATmega328p datasheet in sleep mode part showing the wake up sources and deactivated ...
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2answers
797 views

sleep mode and watchdog at the same time

suppose a project with Arduino that we should save battery power, so we use sleep mode and also avoiding the Arduino of hanging and use watchdog timer. But the problem is here that when the Arduino ...
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1answer
55 views

Can someone help me decipher the code for the arduino? I am totally lost

The code is as follows: void loop(){ light = analogRead(5); Serial.println(light); analogWrite(3,light/4); }
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1answer
412 views

Problem to Setting up i2c OLED wemos D1 mini shiled (64*24)

Hi I used this shield before well. But it didn't work when I wanted to work with him last night! this is my wireing : Now I want to know how to test that it is healthy? Is i2c address missing or ...
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0answers
93 views

Arduino Measuring Microwave Leakage

I want to measure if my microwave has a leakage using Arduino. Ideally, I would like to get the exact number measured by mW/cm2 (similar to HT-M2 devices). Any advice which Arduino module can do it?
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1answer
396 views

Sparkfun CCS811 sensor not interfacing with arduino

I have sparkfun indoor air quality sensor CCS811 which needs to be interfaced with arduino. I have soldered wires on the sensors and connected with arduino. Have checked the connection with multimeter ...
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1answer
186 views

CH340 chip getting fried after connecting Arduino to a powerful 12V souce

I'm using a 120 W DC power supply connected in parallel with ESC and Arduino nano through Vin. However, somehow the Arduino get fried near the CH340 chip, i.e. around the big black square chip near ...
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1answer
152 views

For what is used an ESC with a PWM?

So I was reading a few questions on drone, and I reach this one. It said that an ESC is used between the PWM Arduinno's port and the motor. I don't really understand what it means. According to what ...
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1answer
41 views

How do i Connect multiple sensors in one arduino. Which are namely a accelerometer, GPS, microphone and a GSM module [duplicate]

I am a noob in the Arduino world and have only started reading about it. I have zero experience with Arduino some suggestions to increase my level will also be highly appreciated. But I have a lot of ...
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1answer
62 views

How to connect accelerometer, GPS, microphone and a GSM module to a Arduino? [closed]

I am a noob in the Arduino world and have only started reading about it. I have zero experience with Arduino some suggestions to increase my level will also be highly appreciated. But I have a lot of ...
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1answer
2k views

Do i must have capacitors when using L7805CV voltage regulator?

I am creating a small waterpump (5v) controled by arduino. And i want to reduce voltage from 9v to 5v. Do i must use capacitors when using L7805CV voltage regulator?
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0answers
40 views

line following IR sensor not giving readings at 3m wire length?

I am using line following IR sensor with arduino mega. I need the sensor 2-3m away from arduino since the length of rover is 2m (sensor front & motor back). However, I cannot get accurate analog ...
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2answers
94 views

Two Reed switch in two way directions

Hi im a student having problem in coding I want to set two reed switch in two direction. Example : 1. Reed switch 1 detect then reed switch 2 detect - led turns to yellow 2.If reed switch 2 detect ...
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0answers
510 views

esp32, brownout on 3.3v?

I'm using a powerbump, input: 3.7v-6v Outputs: 3.3v, to provide the power I'm using 2 CR2025 coin cell batteries(3v each), meaning the powerbump gets 6v, the esp gets the exact 3.27v(I've measured ...

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