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 connect programatically two wires of external 3.3V device
What is a missing puzzle in here, relay, transistor?
I would like to pull pin of external device to the ground programatically using arduino's digital pin.
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0
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1
answer
75
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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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3
votes
1
answer
342
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Common Ground Between Arduino and ESP32 - Can I Re-use the ESP32 GND Pin for a Potential Divider
I am trying to connect an ESP32 to an Arduino Mega via Serial Communication using the UART 2 ports on both microcontroller boards.
There needs to be a common ground between the ESP32 and Arduino. ...
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0
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1
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499
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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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0
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0
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110
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How do I control a BLDC with greater precision using bluetooth?
I am building a quadcopter drone and I have 4 BLDC motors that I can control using an HM10 Bluetooth module and the "Dabble" application.
My problem is that when I use a virtual joystick in ...
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0
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2
answers
1k
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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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0
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2
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146
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How does actually arduino measure voltage?
I am not interested into the AnalogRead() part, but rather on how he converts 5 or 2 V into a number between 0 and 1023. How does it practically do it to convert the voltage level into a number or ...
3
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2
answers
402
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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 ...
3
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0
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298
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Sim800l doesn't respond to AT commands
My SIM800L doesn't respond to AT commands. The serial monitor is simply blank.
And the led blinks every 3 seconds which means it is connected to a network
I power it through an LM2596 buck down ...
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2
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96
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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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1
answer
52
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Controll the dc motor that works with 2xAA bateries using 5v
I have a toy that has a dc motor and is runing with 2xAA bateries ( i think it is 3v motor)
So i want to run it with 5v power supply.
First question: Can 5v damage the motor
Second question: i think i ...
2
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2
answers
122
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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/ ). ...
1
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1
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763
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Need help ATtiny85 not working as standalone
I have ATTiny85 that I want to drive a servo. Burned bootloader to the ATTiny85 and I am using HW-260 development board to program and to test the code. While the ATTiny85 works perfectly on the HW-...
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1
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102
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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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0
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1
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192
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64 led strips and 8 shift registers (connected to 64 sensors) connected to 5V and ground of arduino
I have connected 64 led strips and 8 shift registers (connected to 64 sensors) to 5V and ground of arduino. Voltage received at led strip is 3.1V and at registers is 3.2V. I plan to add an led display ...
2
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1
answer
376
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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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0
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1
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76
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Can pin mode damage Arduino with connected electronics?
I am not that experienced with electronics, so this might be a silly question. But I dont know. Assume that I have connected some electronic circuit (transistors, leds, anything else) to the Arduino ...
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1
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0
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196
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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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1
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1
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2k
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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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2
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2
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1k
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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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1
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1
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78
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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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2
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1
answer
904
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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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1
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2
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223
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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 ...
1
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2
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122
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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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0
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340
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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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2
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1k
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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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1
answer
2k
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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 ...
2
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1
answer
4k
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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 ...
0
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1
answer
38
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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 ...
1
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0
answers
125
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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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347
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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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1
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1
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84
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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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2
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0
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340
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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 ...
2
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1
answer
168
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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 ...
1
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0
answers
38
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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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0
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83
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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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2
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1
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93
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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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1
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94
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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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3
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2
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92
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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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0
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183
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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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2
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1
answer
144
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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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4
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1
answer
1k
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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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1
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2
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3k
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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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1
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98
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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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0
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0
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58
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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 ...
0
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0
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146
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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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2
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2k
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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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2
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9k
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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 ...
2
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1
answer
1k
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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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