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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41 views

Bode plotter using Arduino

I want to build a bode plotter with Arduino, Based on the block diagram of figure 1. Basically I want to use 3 RMS voltmeter, I thought of LTC1968 (https://www.analog.com/media/en/technical-...
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1answer
46 views

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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1answer
154 views

Scroll LCD display connected to an Arduino Uno

I want to make some characters scroll left without affecting the first positions in each row of my LCD 16x2 screen. I have this code inside the loop so far: lcd .clear(); lcd.setCursor(17, 0); for (...
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2answers
886 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
355 views

What is the best way to establish wireless communication between the Lilypad and a Mac?

I want to build a wearable device for a dancer using the Lilypad and I need to first send the programme from my Mac to the Lilypad board and then transfer the data read by sensors back to my Mac. I ...
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1answer
34 views

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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1answer
37 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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2answers
769 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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0answers
38 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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1answer
60 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 ...
2
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1answer
125 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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2answers
14k views

Voltage changes but digitalRead always HIGH

I developed simple push button project I used wemos D1 mini I connected D3 pin to pull down 1K resistor. I used multimeter to measure D3 pin voltage. When i push the button, D3 pin voltage changes ...
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2answers
132 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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3answers
2k views

Nodemcu is connected to 5v relay with logic converter but still not working

I am using a bi-directional 3.3-5V logic converter to control 5V relay with 3.3V D5 pin of nodemcu. link of logic converter is here However, I expected to control the relay but it didn't work. I don'...
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1answer
43 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
108 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
124 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
83 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
68 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
316 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
321 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 ...
2
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1answer
790 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
21 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
68 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
108 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
45 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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1answer
110 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
76 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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0answers
250 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 ...
2
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1answer
72 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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0answers
31 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
32 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
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
43 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 ...
3
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1answer
573 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
3k views

flash read err, 1000

I know this question has been asked multiple times but solutions giving there hasn't been working, I've got an esp32 soldered to my own designed PCB board with a UART to USB converter all that is ...
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2answers
577 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
34 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
64 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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3answers
4k views

Industrializing Arduino - 24V io? (Electronics)

I would like to make an arduino board that is capable of handling 24V i/o. Powering the Arduino would be done through either a linear or switching regulator of some sort. Low amperages, so efficiency ...
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3answers
20k views

DHT.h Library not being imported

I am trying to read the humidity and temperature using a DHT11 temperature sensor for an Arduino UNO using the DHT.h library. I have my code below: #include <DHT.h> #define dataPin 4 dht DHT; ...
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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
188 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
97 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
13k views

10k ohm Potentiometer vs 10k ohm Resistor on LCD Display

I'm trying to use a LCD Display with my Arduino, but I don't have a potentiometer and all of the guides I find always require one, usually a 10k ohm potentiometer. The point is that I'm not very good ...
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2answers
221 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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1answer
56 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
468 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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