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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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1answer
49 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 ...
0
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1answer
35 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
104 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 ...
1
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1answer
33 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?
0
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1answer
17 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 ...
0
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0answers
25 views

Arduino stk500_recv():

My Arduino was connected to a stepper motor and it doesn’t connect to any power supply or usb cable ,i turned the motor and my Arduino lights was started to blink , but now i cant upload sketch to my ...
3
votes
1answer
145 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,...
0
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1answer
49 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 ...
0
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1answer
40 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 ...
0
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1answer
17 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)...
0
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1answer
37 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 ...
-1
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1answer
28 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 ...
4
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1answer
119 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 ...
0
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1answer
25 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 ...
0
votes
1answer
77 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 ...
0
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2answers
102 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 ...
0
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0answers
45 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. ...
1
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3answers
408 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 ...
1
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1answer
314 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 { ...
0
votes
1answer
27 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 ...
7
votes
5answers
601 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 ...
0
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1answer
60 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 ...
-1
votes
2answers
51 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?
1
vote
1answer
142 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 ...
1
vote
3answers
2k views

My Arduino isn't showing up on my computer. What should I do?

You have your spangly new Arduino board, you've installed the software, and you plug it in. Nothing happens. Diagnosing problems may be a little tricky for the beginner, so what hoops should you go ...
1
vote
2answers
116 views

Decode VGA port by Arduino [closed]

Is it possible to read somehow VGA port of graphics card by Arduino? Even with some minimal 320 x 240 resolution and minimal frame rate per second, to convert pixels into numbers (for example) somehow....
0
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2answers
102 views

Arduino mega board 5v pin does not gives 5v when 7.5v is applied through external source

I gave 7.5v to the arduino mega board through battery. 5v pin in the board gives me the same voltage as input. Earlier it was working fine now it is giving problem.Please let me know the solution as ...
0
votes
1answer
1k views

Break loop/restart program at any time

maybe my problem is just that my thinking is wrong. I hope you can help me. First of all I will point out what I think in general, then I show you some code to work with. In general my problem is to ...
0
votes
1answer
242 views

ESP8266 Wemos D1 Retrieving Wrong AP Mac Address

Using WiFi.BSSID and WiFi.BSSIDstr gives me some weird mac address. the code is: #include "ESP8266WiFi.h" #include "ESP8266WiFiScan.h" void setup() { Serial.begin(115200); //WiFi.mode(WIFI_STA); ...
0
votes
2answers
132 views

Analog output low voltage issue, how to troubleshoot

I have connected my arduino according to the schematics in the image, with a few additions. The setup A DC motor (water pump) drawing power from Vin, going to ground via a transistor based in A0 ...
0
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1answer
219 views

LEDs on Arduino WiFi Shield

I would like to know the purpose of the LEDs on top of the Arduino WiFi Shield: L9/Link/Error/Data (left in the picture). What do they indicate?
13
votes
4answers
4k views

Burning Arduinos one after another

I very accidentally caused a short-circuit to two completely different cheap (under 4$ each) Arduino Uno clones, rendering Windows sound alert for unplugged USB several times. This subsequently led ...
0
votes
1answer
19 views

Arduino: Digitally Muti-Switch - What is the proper term for hardware?

I have recently purchased a RoboMower. Like most of the automated mowers these use electric-fence wiring to mark the borders of the property and keep a small charge on those wires so that the mower ...
0
votes
1answer
133 views

What would be the Western / American equivalent of the Troyka Shield and modules?

I'm taking an online course on Arduino robotics, produced by the Moscow Institute of Physics and Technology. The lectures are translated into English, but all of the parts referenced are by the ...
1
vote
3answers
155 views

What's in an Arduino?

I've been using an Arduino Uno Rev. 3 for a few projects and would like to switch to using a bare Atmega328 chip so I can keep everything on the same board. I've seen the Arduino on breadboard ...
0
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0answers
33 views

I need some hardware expert tips for my project

I am total newbie in here. I need to build a hardware which can record a button press. Button press can be any touch or non touch. So, it may or may not require a display. We need to transfer this ...
4
votes
2answers
1k views

SIM800C developer board “SIM not inserted”

I bought this SIM800C development board (vendor unknow): I conected it to an Arduino and put a brand new SIM card in it. This is the model of SIM I'm using: Problem is, development board doesn't ...
1
vote
1answer
690 views

How can Arduino know Wire.available() is true or false?

In this part of code void readFrom(byte device, byte fromAddress, int num, byte result[]) { Wire.beginTransmission(device); Wire.write(fromAddress); Wire.endTransmission(); Wire.requestFrom((...
0
votes
1answer
46 views

Doubt on Processing Power

The datasheet of arduino mega claimed that the board has 16Mhz processing power. But the question that doubt me is what would happen to the board if the board has no enough processing power. For ...
10
votes
1answer
1k views

What is the purpose of the I/O pin capacitor on the AVR microcontroller?

What is the purpose of the capacitor on the I/O pins on the ATmega328 (I imagine it's on other AVR microcontrollers as well)? Is it to reduce noise from other parts of the microcontroller?
12
votes
5answers
4k views

Does an Arduino get worn out by too much command execution?

Excuse me if it is a silly question, but I couldn't find an answer. I've been wondering for a while whether an Arduino (or generally any other micro-controller) gets happy if the code is light and ...
0
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0answers
245 views

Connecting Arduino to Android Via Bluetooth for Volume Control

I want to use a strip pressure sensor to control the volume of my Android Music Player/ Audio File. So I basically need to control my android device through a pressure sensor strip connected to an ...
0
votes
1answer
82 views

Do they make 2.54mm 2P Crimpable Micro JST Female connectors? [closed]

This may be a dumb question but I need some (preferably with wires already attached) and I'm unable to find any like this. Everything I find has male crimps and female surface mount. That doesn't work ...
0
votes
1answer
95 views

(SOLVED) Fast HW check: (18 digital + 4 analog to I2C ) Arduino Mini Pro + MCP23017 or STM32?

Arduino Mini Pro+MCP23017 or STM32 I want make device, which reads 17 digital buttons and 4 analog, process it somehow and send the result to I2C bus. Also there is a LED to be managed. I may want ...
1
vote
0answers
278 views

How can I connect a Fona to an Adafruit feather?

I have this adafruit-feather-huzzah-esp8266: https://learn.adafruit.com/adafruit-feather-huzzah-esp8266/pinouts and I want to connect a Fona board. But I am not certain which pins have the ...
-2
votes
1answer
730 views

L298n - both outputs to one motor [closed]

how do I wire and drive 1 motor with the 2 outputs of the L298n motor driver module? (parallel the outputs)
0
votes
2answers
730 views

The fastest way to read out a digital pin state in an Arduino Due

What is the fastest way to read a digital pin status in an Arduino Due? Is it possible to achieve speed in the Nanosecond area? With which type of code I can achieve this? Edit: This question is not ...
0
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0answers
186 views

door protector using arduino uno and GSM sim800 module

Please check the arduino program given below and help me to find out error. The program is for following hardware. GSM 800 module Arduino Uno board Limit switch(2) We place two limit switch at main ...
4
votes
1answer
46 views

What controller should i use?

I'm working on a little DIY project in which I intend to make my own dataglove. Now I'm kinda stuck on choosing the right microcontroller. And since it can be quite costly, I thought to ask for some ...
3
votes
1answer
104 views

USB DEVICES WITH THE 32U4?

I have an Arduino Pro micro and I need to know if it is possible to use an USB device like a camera or things like that Since the processor is a 32U4. the USB Shield is for the Arduino Uno and I don't ...