Questions tagged [hardware]

The physical circuitry and other components of a machine or device. This is distinct from the program code running on a device, which may be called software or firmware.

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28 views

ESP8266 Loop cycle frequency gets decreased after WiFi got disabled

In a traditional scenario, after the setup() method we go to the loop() method of our sketch. You know, usually it gets executed probably 5-10 times in a second (or even more). I am now playing ...
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2answers
56 views

Is the LGT8F328P legal?

Since some months, everyone can buy a board with this IC. It is compatible with the ATMega328 and has some features like 12bit ADC (instead of 10 bit), DAC, unique ID and also 32MHz. But I can't ...
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4answers
53 views

Program Arduino then Remove Atmega?

Can I program an Arduino and then remove the micro-controller from it and use it on a breadboard without reprogramming the micro-controller again? My steps would be: create my Arduino code. I upload ...
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25 views

Help with turning LED on using smartphone with HC-05

I followed this tutorial: Remote Controlled LED using HC-05 I've assembled everything, uploaded the code and connected it with my phone. The code: /* Arduino Turn LED On/Off using Serial Commands ...
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25 views

Having problems with Lilypad [duplicate]

So I recently bought a Lilypad and a Prolific PL-2303HX which I only discovered when connecting it to the computer has phased out since 2012. I found a video online which shows the solution was to ...
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3answers
24 views

Help me get my robotic car to work?

So I recently followed a tutorial on youtube and I've assembled the car and connected all the wires. What I've done: Car Now in the video, when the guy connects all the wires, the wheels constantly ...
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1answer
54 views

Connecting MPU6050 to Arduino Lilypad

To preface, I am very new to Arduino and I watched this video on YouTube. It shows how you can build a motion controlled car with Arduino and I decided to make this for my school project. One thing ...
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30 views

What can cause an Arduino to “disconnect” from Windows?

I bought a DFrobot Beetle and it worked fine for probably an hour, then it just stopped working with Windows. When I connect it to the computer I hear the "connect" sound, then within 5-7 seconds I ...
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1answer
41 views

What hardware do I use to detect an electric current going to a lightbulb and tell if it is turning on and off [closed]

I’m doing a project where you have to detect a lightbulb coming on through the electrical current and was wondering what Hardware and what the program is? Can y’all help? Very much appreciated if y’...
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1answer
79 views

MOSFET dimmer IR controlled

I am trying to make a group of LED dim with PWM to a MOSFET. The code seems to work for this, but the trouble is that the IR receiver will only receive the signal to turn on the lights and then IR ...
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1answer
56 views

No Data Received on Serial Port & Unable to DFU Reset. Advice?

Having a problem running my original code that I tested last week, which worked on multiple days last week. I tried to do a DFU reset and update the BootLoader, but it didn't work. I checked the ...
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2answers
249 views

Which kind of diodes I should use in buttons/keys matrix input? (Making gaming keyboard)

When making matrix input of NxM columns/rows with push buttons, there should be a diode next to each button to prevent "ghosting" and able read many keys pressed together correctly. There is a lot of ...
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1answer
59 views

AC Voltage Sensing using Arduino Uno

Is it possible to sense AC Voltage using analog input for Arduino Uno or can it only read DC? I mean I've tried connecting an AC voltage source to analog and I'm reading some numbers. However, I don'...
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2answers
68 views

Using 8bit ports as 8bit I/O variable (while using USB,I2C, SPI and Serial) - keyboard

I am seeking HW. I would like to make keyboard with enhanced functions (RGB backlite, macros, programmed profiles etc) driven by some small MCU (Arduino Micro Pro or something similar). To support ...
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2answers
37 views

Load Resistor Use for Voltage Sensing by Arduino

I connected a piezoelectric film to a Arduino Uno board via analog input. However, as I was getting very high voltage values (reaching 5 volts without much movement). Therefore, I added a 1 megaohm ...
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3answers
110 views

Is there an alternative to soldering to connect boards?

I know that shields are usually soldered to headers so they can be attached to the board with the Arduino. I have a tremor, which makes soldering impossible. Are there ways of connecting PCBs without ...
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1answer
121 views

Arduino Hardware serial pins with RS485

I tried asking a question in my earlier post - SerialEvent with RS485 communication it helped me understand Hardware serial and Software serial but i had few more questions for which i started this ...
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657 views

Change the mac address on an HC-05

So I tried to save a little money and bought (5) HC-05 bluetooth modules off of our good buddy eBay. When the modules arrived, as I was testing and setting up for my project (2 nano's connected via ...
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1answer
93 views

Motor isnt spinning when using L298N motor controller

I have a L298 motor controller connected to a motor with a 6 volt power sources. the motor however isn't spinning any ideas I'm using a esp 8266 node mcu board. I would like to use pwm but for right ...
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2answers
216 views

Esp8266 Vin pin

I've read that Vin pin is directly connected to usb cable in esp8266 (which is 5V). I wonder if I can power a relay 5V and a servo motor Sg90 with this pin? And is there any danger of doing that ?
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48 views

Can I put a resistor in the ground connection of my DHT22 sensor?

I'm building a project that uses a couple of Adafruit DTH22 temp/humidity sensors. (https://www.adafruit.com/product/385) I have them wired into my project box through 3.5mm mini plugs (The kind that ...
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3answers
82 views

Can I use Arduino for my purpose? [closed]

I am trying to make an agv (automated guided vehicle) that will be line following, will have obstacle detection along with dragging 200 kg of weight in drums with wheels. My project is for industrial ...
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1answer
83 views

Need some help on a very small project [duplicate]

Apologies for the simple question, I really couldn’t find any help online with this as when I kept searching, the results had lights that had way too much voltage compared to what I need. So I have a ...
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3answers
713 views

74HC595 shift register not working

I got my Arduino kit a few days ago and I've been going through some of the tutorials. I got to the 8 LEDs with a shift register tutorial, where I got stuck. Nothing would light up after I plugged ...
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2answers
60 views

Rescuing an Arduino With a Broken Setup()

I may have bricked my Arduino Pro Micro by writing a broken code into the setup() function. When I plug my Pro Micro into my PC, I see it register a COM port for a brief moment before it disappears. ...
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2answers
578 views

Power on reset with arduino uno can never happen. Can this be fixed?

When an Arduino Uno is powered on, the USB chip's DTR output pin may (is, in fact) low for a while. This means that the capacitor C5 is connected from the 328p reset pin to ground. Thus, when power ...
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1answer
133 views

Getting at the PS_ON pin on a RAMPS1.4 mounted to a Mega

Got it! Check end of post for solution. I'm running a Mega 2560 with a RAMPS 1.4 Shield which is usually used for 3D printing applications. For my use case I only want to get at the stepper motor ...
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1answer
158 views

Garbage stored in SD card

I am an electronics graduate and an embedded design engineer, working in this field for about two years apart from the hobby time during my graduation. I am currently working on a system that has an ...
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1answer
104 views

How do you use the plastic cover/case that came with Arduino?

They have holes for screw on, on top of the holes on the Arduino itself. Where can I find parts that are compatible with this case/cover? What was the intended use of this case/cover? Thanks.
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2answers
2k views

How to give an analog output of 0-5V

I'm trying to program an Arduino to control a motor at different intensities by giving a 0-5V reference value from the board. I have some programming experience, but have very little knowledge of ...
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1answer
113 views

How do I connect my Luxorparts keypad to my Arduino?

I just bought a 12 digit keypad from Luxorparts and it doesn't come with any schematics showing how it's wired at all. How do I figure out how to connect it to my Arduino?
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1answer
35 views

Connecting Arduino and Processing, how do I know what COM to read?

I'm using Processing to read data from the serial port that the Arduino sends. When I go to device manager it shows that the Arduino is in COM 4, but in order for Processing to read from the Arduino ...
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1answer
10k views

Difference between these two NodeMCU boards?

I recently received a NodeMCU (identical to the one shown in the first picture below) and originally, I was unable to connect it to my computer which eventually turned out to be driver issues; however,...
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1answer
884 views

Pulse counter to measure flow-rate: 0 Pulse issues

I am using a Netafim M-Series flow meter interfaced with a UC-32 Arduino. The goal of this is to create a pulse counter than in turn will allow us to determine flow rate in the meter. (1 US gallon per ...
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1answer
49 views

How to determine hardware/software compatibility? [closed]

Currently, I'm using Greiman's SdFat Library with Adafruit's Data logging Shield. I'm thinking about switching to the Adafruit micro SD Card Breakout. I imagine that it will work as both products ...
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1answer
19 views

Digital output from one nano to digital input of another.

Can I connect the digital out of one arduino to a digital input of another? To detect a high/low state... One powered in one room on USB. The other in another room separate psu (connecting the grounds)...
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1answer
51 views

No potential across output of H-bridge

I’m working on a robot with a club at my school. So far, our team has an H-bridge shield (https://www.freetronics.com.au/products/hbridge-dual-channel-h-bridge-motor-driver-shield#.WwI9omh_WEc) to ...
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1answer
50 views

Making a distance sensor for human interaction [closed]

I want to make a sensor that senses a person between 1.5 m and 0.2 m, connected to an LED that is on 100% at 0.2 m and 1% at 1.5 m and gradually scales. Is an ultrasonic sensor the best sensor to use ...
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1answer
319 views

Interrupt fires a random number of multiple times for one pulse

This is my first time posting on this forum. I have tried to format this question properly, but let me know if I need to correct anything. I searched to see if someone else had a similar problem, but ...
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1answer
40 views

Coding Arduino's samples/period and cycles/sample configurations for input signal [closed]

Am I able to code the Arduino so that I can change cycles/sample of an input waveform and a number of samples/period configurations? I would like to modify these parameters in order to be able to ...
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1answer
293 views

Readings changing in hall effect sensor

I am using a A1324 hall effect sensor for a distance measuring. The voltage output keeps changing even if the distance between the magnet and sensor does not change. The output changes +-0.200V and I ...
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2answers
118 views

Need help with understanding the CapacitiveSensor circuit diagram

Hey guys I need help with understanding the circuit diagram from this link: https://playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense As of now, this is the schematic I drew from what I ...
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0answers
58 views

Need help with Arduino Love-O-Meter

not sure if this is the right place to post, but basically I am trying to make a Love-O-Meter, similar to the Arduino project example. However, my method of determining the score is different. ...
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3answers
2k views

D1 Mini; is there a fuse?

While this board (listed on ebay as D1 Mini NodeMcu Lua WIFI ESP-12F ESP8266 WeMos 4M Bytes Development Board Kit) was powered by usb, I accidentially shorted between the gnd (G) and 5v pins on the ...
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1answer
727 views

I'm trying to display the numbers 0-99 by multiplexing to two 7 segment displays. One number does not display

//Numbers 0-9. int numberArray[10][7] = { { 0, 0, 0, 0, 0, 0, 1 }, //0 { 1, 0, 0, 1, 1, 1, 1 }, //1 { 0, 0, 1, 0, 0, 1, 0 }, //2 { 0, 0, 0, 0, 1, 1, 0 }, //3 { 1, 0, 0, 1, 1, 0, 0 }, //4 { ...
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1answer
30 views

ledkeypad shield not responsive

I recently purchased several of the DFRobot ledkeypad shields: https://www.dfrobot.com/product-1407.html I have Arduino Leonardo (which also had some problems in the beginning, being recognized as ...
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5answers
2k views

When Raspberry Pi is preferred over Arduino

We are doing some projects in class. One of my friends is doing a weather and humidity station using raspberry Pi with a couple of sensors and LCD. I have a little experience in Arduino. So I asked ...
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1answer
166 views

Arduino Yun with PoE does not work when powered via PoE

I have a Arduino Yun with PoE with LininoOS version Linux arduino 3.3.8 #1 Thu Jun 2 12:28:33 CEST 2016 mips GNU/Linux I have the Version 4.0 of the module. I often notice that when I connect ...
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2answers
62 views

Can I change Vcc to some other pin?

I was working on an Arduino Uno and while carrying it to my teacher the wire's pin got stuck into the Vcc of 5 V. Can I set Vcc to other inputs? If so, then how?
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1answer
454 views

Help: Using if-else on two switch state

Problem I'm stuck on triggering different switch. I'll explain what each of my switch should do. Output of this setup : No output from relayPin mainPin Main power of the switch to control relayPin ...