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Questions tagged [arduino]

Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

0
votes
2answers
129 views

Long distance (and I think low frequency) serial communication with Arduino [closed]

I need to implement a long distance (up to 15 kilometers) communication between some electronic devices. The devices is some boards on AVR chips with Arduino library and a Raspberry pi as the ...
9
votes
2answers
2k views

Is this a case of ground loop?

I'm trying to power a 24V DC motor using 2x 12V batteries, an Arduino and a Cytron MD10C Motor Driver. I followed the description on Cytron's website for how to connect the Arduino and the motor to ...
0
votes
1answer
51 views

Check for 12V with Arduino (Two resistors and a diode)

I need to read the presence of 12V on one of the lines of the board. I want to read using Arduino UNO. I found the following scheme: Is this scheme correct?
1
vote
1answer
126 views

Zero crossing detection circuit correct?

I am working on a DIY AC dimmer circuit with arduino. This project is part of the AC dimmer circuit as mentioned here Since, I was stuck in so thought of retracing my steps and checking each part of ...
-1
votes
4answers
114 views

Controlling DC 90V motor with Raspberry Pi or Arduino

I have project where 90v dc rotating motors(4 of them) must be controlled via Laptop. What is the most simple solution, Can I go with raspberry pi or need to go lower with arduino or there are ...
0
votes
2answers
58 views

Frequencies in atmega (uC)

I want to use an atmega328p with nrf24l01 + wireless module and communicate it with an arduino nano with nrf24l01 +. My question is this, if I use different frequencies in the microcontrollers, will ...
0
votes
2answers
73 views

Calculating necessary transistor for LED switching

I have only just started to play with electronics (literally less than a week ago) and have purchased myself some cheap Arduino Nano clones, as well as some LEDs, resistors (only 10 ohms at the moment,...
0
votes
0answers
60 views

Ground Test with MID400 (Optoisolator)

I design my controller, one of the tasks of which is to check the operability of grounding in an AC line. The controller will be built on the basis of ATMEGA328P (Arduino UNO), in the high-voltage ...
1
vote
1answer
37 views

Measuring 24V AC input state with microcontroller

I need to measure the state (on/off) of a 24V AC line that is currently powering a solenoid valve. The microcontroller will take over the control of the solenoid through a solid state relay, but I ...
0
votes
1answer
46 views

Opto-Isolater always on by higher voltage

I use an AQH3213 Opto-Isolater. When I use 3.3V on the 'dc motor side', everything works fine and it 'turns off and on in an interval of 1 second'. But when I use 5V, it's always on.... Do you have ...
1
vote
1answer
113 views

Ultrasonic Pulse Generator using Power Mosfet and Gate Driver. Confused about datasheet compatibility

I'm working on a project for University. The goal is to create an ultrasonic flaw detector that can measure flaws within a piece of metal. I have only taken introductory courses in the different ...
0
votes
1answer
67 views

Resistor between GND and + 5V in Arduino

I design a board based on ATMEGA328P (as in Arduino UNO). Now I am busy creating a power line. My controller will be installed on the electrical panel, so I need to provide a reliable, noise-resistant ...
1
vote
1answer
53 views

What's the source of this noise in my Arduino oscillator?

I've been experimenting with techniques to rapidly switch on and off the digital output pins in an Arduino. This is the code I use: ...
1
vote
1answer
83 views

Floating analog input using Arduino with 1m cable

I use an analog input from an Arduino to read the value from a piezo plugged in parallel with a 1M ohm resistor. I followed this tutorial from Arduino: https://www.arduino.cc/en/Tutorial/Knock Here ...
0
votes
0answers
32 views

BLE Nano I2C on P0_10

I have a project where an nRF51822 (BLE Nano v1.5) is an I2C master and communicates with an Atmega328. I have communication working over I2C just fine using various pins. However, when attempting to ...
0
votes
1answer
82 views

Effects of Neodymium magnets on PCB

I'm currently doing a project that consists of: Arduino Nano. Battery. Buck Boost converter. GPS module. TSL2561 light sensor. BH1750FVI light sensors. LSM6DS3 Accelerometer. HDC1080. MicroSD shield ...
2
votes
2answers
65 views

Can a relay be used to power a 3.3 V appliance?

I'm a programming student and I got into an Arduino class this semester. Here's some backstory behind this question: I need to make a Bluetooth module switch modes from master to slave and back, but ...
-5
votes
3answers
123 views

bike won't start until rider wear helmet [closed]

I am trying to make a project in which ignition system of bike will not start until the rider would wear a helmet. This can be done through RF Transmitter and receiver, but how it will be achieved? ...
1
vote
3answers
83 views

How to obtain Input voltage from ADC value

I am using atmega328p for my project. I have to read my battery voltage and display it in my cloud. For that, i am using ADC. Now I am getting the ADC value for input voltage applied. But i need to ...
0
votes
1answer
94 views

How to send data to an ESP32 with as little delay as possible from an Android app [closed]

I have an ESP32 module. I want to send data to it using an Android app. I tried using http but the delay is big especially since I want to send about 20 values per second with a delay between 50 to ...
-1
votes
0answers
43 views

MAX31855 and ISO7331C isolated SPI issues

We needed isolated thermocouple readers for a work project, so I designed a PCB with two copies of the below circuit on a PCB, with the connections broken out to a JST-XH connector. I received the ...
0
votes
1answer
59 views

Soil moisture using a capacitive sensor - can cheap version of it contaminate soil

Maybe a bit silly question but I was wondering if these cheap versions of soil moisture capacitive sensor (Corrosion Resistant Analog Capacitive Soil Moisture Sensor) may release chemicals to soil. ...
0
votes
2answers
91 views

Software controlled variable voltage AC supply with SSR relays

I have an autotransformer like this one : I would like to control it with an arduino solid state relay like this one: What would happens if I wire every output of the transformer together to the ...
0
votes
1answer
40 views

Measuring voltage on an Arduino pin, while powered from USB, with separate grounds

I have Arduino Uno connected to a computer with a USB cable. Then I have a DC circuit, powered by a wall adapter. In this circuit, I have a shunt resistor (connected in series after the load) and I ...
0
votes
1answer
34 views

Trying to read the data from an ASK RF transmitter

I'm trying to duplicate the operation of a simple RF remote control (for some remote power outlets). In the remote control there is an unmarked 8-pin microcontroller. I've worked out which pins are ...
1
vote
4answers
79 views

Reading a Bi-Color LED on Arduino [closed]

I am looking to read the status of a battery charger using an Arduino Board. The battery charger shows red when a battery is being charged and green when a battery is charged. I understand that the ...
2
votes
2answers
53 views

Will this MOSFET be suitable for driving a 12V 1-2A Load from an Arduino?

I have an Analog 12V RGB LED strip (which only requires 1-2 amps at most) that I want to control using an Arduino Uno. I looked into how I could go about doing this and saw that i could use several ...
3
votes
2answers
148 views

Powering 30m of RGB LED strips?

I'm currently interested in following this tutorial which explains how to create a homebridge (ESP8266) controlled 12v RGB strip which is exactly what I've been looking for. However, whilst I do ...
1
vote
1answer
28 views

Reducing the amount of controller output required - making k of n binary to unary decoder out of 1-of-n decoders

I am a kind of self-taught electronics dabbler and being a selftaught tinkerer has the unfortunate consequence of reinventing the metaphorical wheel quite often. I'd like to avoid this fate again if ...
0
votes
2answers
68 views

Won't a potentiometer powered by a dc supply cause a short-circuit at lower end of the range?

Many tutorials in the Arduino or Raspberry Pi community simulate an analog sensor with a potentiometer. The potentiometer, being a passive device, is powered from the same DC power source that ...
2
votes
0answers
80 views

Is it okay to connect 2 lithium ion battery in parallel to a charger that can maintenance 4.2V? (more detail in post)

So I'm planning to make a charger that can charge multiple lithium batteries in parallel with hope to use recycled one. I fully understand that they are dangerous when you do it incorrectly, so I just ...
0
votes
1answer
69 views

LDO, linear regulator or DCDC buck converter

I would like to power an ESP32 in my car, so the input voltage is between 11 and 15v, and the output voltage should be 3.3v to power the Arduino board. I thought that LDO were only for low dropout ...
1
vote
1answer
117 views

Using Atmel Studio 7 to program Arduino Uno

I will like to use AS7 IDE to program the Arduino board, for start Im using Arduino UNO with ATMEGA328P-PU chip. Im using Windows 10 professional First I used the Arduino IDE in order to run/...
1
vote
1answer
56 views

Stepper Motor Voltage

I am having a problem making a stepper motor run. The problem is that the voltages that I am reading from the motor never reach zero (they move from a high voltage to a smaller voltage) so they never ...
1
vote
1answer
251 views

Use IRF540 MOSFET to control LED strip

I was hoping to use this mosfet shield to control a "Standard 3528 12V LED strip". The shield looks like this: However, it doesn't come with a datasheet (I guess that's my fault for being cheap) and ...
0
votes
3answers
80 views

How should I used two MLX90614 sensor on one Arudino Uno given that the sensor has a fixed I2C bus adress? [duplicate]

I have an arduino uno and want to use a non MLX90614. I plan to used more than one sensor on the same Arduino but I don't know how to use two MLX90614 on the same I2C bus.
-6
votes
1answer
109 views

Arduino MKR Vidor 4000 [closed]

Can it capture the image in full Rpi camera resolution and save it somewhere? Thank you for your time.
-1
votes
0answers
57 views

BME280 and MPU9250 not working together

I'm doing a hobby project with two sensors: popular weather sensor BME280 and 10DoF sensor MPU9250. My board of choice is Teensy 3.6. Links to both sensors (Polish shop): https://nettigo.pl/products/...
1
vote
0answers
53 views

Electro magnetic interference with Arduino Uno and a portable radio

I'm surprised when I'm working with Arduino Uno, by just sitting beside a portable radio, like when I was powered on both Arduino & Radio and when they are close to each other I got some noise ...
0
votes
3answers
107 views

Logic behind a PID controller?

I'm having trouble understanding the logic behind a PID controller used for temperature control. If I were to implement it with a SSR and an Arduino, for example, my aim is to have the PID value be ...
0
votes
1answer
41 views

How to increase current output of capacitor bank with buck booster?

I'm pretty novice when it comes to electronics given that my background is in mechanical engineering. But I am trying to design a circuit that can take a 5V (almost 0A current) to charge a capacitor ...
1
vote
2answers
157 views

ESP32 max input voltage UART

Before doing any mistake, can you confirm me that it is not possible to connect directly UART pins of Arduino UNO on UART pint of ESP32 ? I see on the datasheet a voltage of 3.3V. I would like to ...
0
votes
2answers
64 views

ESP8266 - PULLUP resistor using Arduino code

I'm having some trouble with this ESP8266, to switch UP, DOWN, OFF dual relay, using Arduino code and a physical 3 states switch. The code defines input GPIOs 12,14 as ...
1
vote
0answers
41 views

Sharing power between components in a Arduino circut

I am trying to power both an ultrasound sensor (HC-05) and an infrared sensor (FC-51) from Arduino's 5V pin, connected in parallel. The circuit is very primitive. When connected separately, both ...
0
votes
3answers
56 views

How to drive a 3” TFT

I want to display 2 or 3 images in a loop (every 5 seconds or so) on a 3 inch TFT. The TFT can be found here, Resolution 240x400 Screen 3 Inch Tft Lcd with MCU Interface It uses an MCU interface, I ...
3
votes
4answers
226 views

Do voltage dividers waste battery?

I am attempting to make a battery powered alarm clock with an Arduino, and I would appreciate some help on the circuitry part. I am very inexperienced with electrical engineering. I am using a ...
0
votes
2answers
106 views

Shorting capacitors using a transistor?

Introduction First off, I'd like to let you know I am a beginner at electronics so some of the stuff I say might be very wrong. What I want to make is a 'spark generator' for lighting some gases in ...
0
votes
1answer
58 views

Best way to develop a kapton tape cutter machine? [closed]

I'm constructing a machine that cuts kapton tape in a specific length, the way I'm doing is there's a motor that keeps pushing tape forward, when the tape covers an infrared led, the motor stops and ...
0
votes
2answers
63 views

Powering a wireless camera

I'm trying to design a camera system for use in my bike shed. The bikeshed is in range of wifi but has no power. First I thought I could use a Raspberry Pi with a Picam, and have video streamed to an ...
-1
votes
1answer
65 views

replace ceramic capcacitor with electrolytic one

I need help, that i have a lack of ceramic capacitor value variety in my country. I need 47μF (microfarad) and 2.2μF (microfarad) ceramic capacitor and i can't get these values. So the question is,...