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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11 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 0.048amps, when I ...
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2answers
36 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
72 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
41 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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6 views

getting interrupt from ignition circuit [migrated]

This transistor ignition circuit for a model petrol engine is built from a proprietary kit. I have made it up and it works. Now I want to take a signal from it as an external interrupt to an Uno ...
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1answer
36 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
42 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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0answers
22 views

timer specific interrupt

how can we get a timer interrupt in a specific time or date? for example I want to make a project with UNO and I'm using sleep mode and the wake up source is timer2 as far as the ATMega328p datasheet. ...
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2answers
42 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
99 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
48 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
93 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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55 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
124 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
59 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
43 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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0answers
26 views

The LED on SIM800L module doesn't blink and the module isn't working

I've recently purchased a SIM800L module from a local retailer. When i have inserted a SIM card and powered it up, the led doesn't blink at all. I have bought the module with a LM317 circuit on board ...
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1answer
21 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
41 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
428 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
32 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
88 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
184 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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1answer
39 views

Taking data from main 120V 50/60Hz power

How can I take data from my house main power and reconstruct it signal? I used an transformer and an inverter amplifier to low voltage to 5 volts and read it with A0 analog pin, but I got a very ...
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1answer
232 views

Does AWG size affect signal from sensors?

Would using a thicker cable like 16 AWG affect the signal being received from an RFID or Ultrasonic sensor? I understand AWG can make a significant impact on voltage when a thick cable is used over ...
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3answers
63 views

3v to 3.5v step up?

I would like to run my esp32 on coin cell batteries, tho it needs at minimum 3v, that means if there just is too much resistance in the vires or anything else, stuff like Bluetooth will make it ...
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1answer
21 views

About boot-loader ic used in DEV boards [duplicate]

I have problem with Arduino MEGA, Arduino Deu etc... Those Development board are having separate MCU except main MCU... Why? For what purpose are they used for? as FTDI or bootloader chip or ...
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1answer
226 views

Brownout detector triggered

I'm running a pretty basic setup. When I run a small program just doing some serial.println, it works fine, when I try to do operations that needs more power, the brownout detector gets triggered. I'm ...
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2answers
378 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
266 views

What is the difference between a Hall effect sensor and an inductive one? [closed]

From what I have read, when placed within a magnetic field, a current will flow in both sensors. My goal is to use this kind of sensors to guide a robot thanks to an existing automower loop wire, ...
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2answers
75 views

Turn on/off low current device (LED) with Arduino

I am just starting with Arduino and my first project consists in switching a LED light with Arduino. I know a relay must be use to control AC high voltage device (i.e. 240V), however, as my LED seems ...
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0answers
25 views

A small problem that I cannot detect, My steppers are not moving for some reason …?

I'm working on a similar project that can be found in this link https://howtomechatronics.com/projects/arduino-mecanum-wheels-robot/ It's the same build. To control the 4 steppers (via the NRF24L01), ...
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2answers
78 views

Arduino Micro & Thin polymer lithium batteries [closed]

Is this battery: Polymer Lithium-ion Battery Model Number: PGEB014461 https://www.powerstream.com/p/PGEB014461.pdf Producing enough energy to power the following Arduino-micro project: ...
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1answer
81 views

5V pin output on arduino

Sorry for the newbie question (just started learning electronics). I just saw a tutorial that says that the 5V output pin on the Arduino delivers more amps (if needed) when connecting more voltage to ...
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2answers
949 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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0answers
82 views

RFduino device required for RFduino hex file

So I have been working trying to measure the velocity of a string attaches using Rfduino microcontroller. I have downloaded all the library(based on https://www.youtube.com/watch?v=K0JiPQnrkHQ) and ...
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4answers
87 views

Detect if laptop is on or not?

How would I safely connect an Arduino so that it can detect if a laptop is on or off? The Arduino would be powered separately by a normal USB charger, since it needs to be turned on even when the ...
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2answers
57 views

Whats the maximum external voltage/current i can apply through an Arduino Uno ? + a couple mini questions

i'm just starting out with electronics and Arduino's and was wondering about the extent of an Arduino's ability. Will i eventually be able to program and power very high voltage/current requiring ...
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1answer
93 views

Arduino only works properly when I'm touching it

I'm working on a arduino proyect, but I encountered a problem that I dont know how to solve. The only thing I have done in the hardware part is connect the arduino nano to a power source (phone ...
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2answers
442 views

How to power Arduino nano and LED strip?

I am making a project that uses an Arduino nano and a sound detector module to power a 1m LED strip. I got the idea from this video and I am not sure how to power it. My LED strip flashes for a split ...
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0answers
27 views

Looking for software allowing for Arduino-based project “mocking” / “wireframing”

I'd like to be able to import a number of components (e.g Arduinos, MPU6050s, displays, motor drivers, LEDs, etc) into an app of some sort then be able to wire those components to each other for the ...
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0answers
33 views

BLUETOOTH MODULES Arduino

I am new to the world of electronics so please forgive me if I ask stupid questions. I would like to ask if there is a difference between Bluetooth Modules that state: "for Arduino" as well as those ...
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1answer
135 views

Problem with arduino starter kit project 7

Can someone pls help me only the two buttons clossest to the big green wire work and i don^t know why i have already tried swapping buttons EDIT 1: my code and i know the first two are working ...
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0answers
455 views

NodeMcu SPI boot GPIO 15

On the esp8266 you've got to pull down the pin GPIO 15 to ground on boot. Otherwise the chip won't boot. However, the boards only open SPI interface has it's ChipSelect (CS,SS,..) on the same pin! Now ...
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1answer
123 views

Water tank false trigger

I am trying to make a simple water overflow protection system for my home. I have created it using BC547 and NodeMCU (ESP8266). I have a simple circuit like this: The problem here is I have 2 wires ...
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0answers
27 views

How can I make a data logging multimeter?(harvesting energy from human motion)

I’m an industrial design major working on a studio project that involves electronics that are kind of out of my league. I have a few low power generators like piezos, thermoelectric (peltier) tiles ...
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1answer
411 views

Control 2 ESC with a potentiometer with arduino

I have 2 ESC (electronic speed controller) which control these brushless motors: Hobbyking Donkey ST3511 Brushless Motor I would like to make them work with a poentiometer, under arduino. I have a ...
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0answers
34 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 ...
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0answers
939 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 ...
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0answers
84 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 ...

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