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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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0answers
34 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 ...
-1
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3answers
81 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 ...
0
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1answer
81 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 ...
0
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1answer
100 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
48 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. ...
4
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2answers
105 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
34 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
88 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
68 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
719 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
74 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
33 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 ...
3
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1answer
885 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
241 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
43 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
18 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
45 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
38 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
votes
1answer
187 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
28 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
163 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
103 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
50 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
886 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
517 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
29 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
1k 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
100 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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votes
2answers
54 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
254 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
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3answers
3k 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
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2answers
191 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
141 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
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1answer
2k 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
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1answer
362 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
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2answers
213 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
288 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
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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
20 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
164 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 ...
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3answers
166 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
2k 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
1k 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((...
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1answer
49 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
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1answer
2k 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
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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
284 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
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1answer
99 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
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1answer
119 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 ...