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.
243 questions
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MFRC522 RFID RC522 Only Works Sometimes – Unreliable Detection Issue
Problem Overview
I’m using an MFRC522 RFID module with an Arduino Uno, and it only detects RFID tags sometimes. The behavior is inconsistent—sometimes it reads the card instantly, and other times, it ...
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Arduino and custom pcb
I am looking to minimize the size and assembly complexity of my arduino projects. Is there any easy way to integrate something like an esp8266 onto my own pcb. I don't want to have to solder it on. In ...
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Interfacing 8 ohm speaker ouput with ESP32
I'm trying to use an ISD1820 recording module with the ESP32, except I want to store the recordings and send them over Wifi rather than playing them back. The ISD1820 has an output for an 8-ohm ...
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ESP32 struggling to trigger relay module consistently
I'm working with a 4-channel, 5 V relay module and an ESP32 which operates on 3.3 V.
The setup seemed to work well initially but I have started experiencing some inconsistencies. One of the four ...
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How to turn LEDs based on voltage readings?
I am trying to turn LEDs in an LED bridge based on the voltage reading from a power source. when the Voltage is zero nothing is ON and then the LEDs gradually turn ON as increase the voltage connected ...
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How to produce multiple DC voltages for a single project with different DC requirements?
I have a project that has two 12-V .2 amp fans, one 30 3 amp LED COB panel, and a 5-V Arduino. I was wondering if there was a simple method to power all of these devices from a 120 V wall outlet.
As ...
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2
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Can a three wire Electrical conductivity sensor (Sensorex CS 150) be used directly with arduino?
I am having an electrical conductivity sensor (Sensorex CS150 with three tinned wires Red, Black and white https://sensorex.com/product/sensorex-cs150-12-mm-graphite-contacting-conductivity-sensor/ ). ...
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Arduino Nano Doesn't Upload Any Code After Connecting It In Reverse (Rotated 180°)!
I've Made A PCB Which Includes An Arduino Nano. I Soldered Some Female Pin Headers Instead Of Soldering The Arduino Itself, So That I Can Easily Plug/Unplug The Arduino Board.
It Was All Good, Until I ...
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2
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375
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Multiple Arduinos connected to one display
I have one display screen, and 5 Arduino Nanos. They are checking to see if passwords in a text file hash to a specific hash, then display it on the screen when found.
Since they aren't all sending ...
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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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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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903
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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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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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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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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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122
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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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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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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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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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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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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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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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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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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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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 ...
