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Questions tagged [system-design]

This tag should be used for questions regarding the selection of components, deciding functionality, and other issues that may come up during the early stages of a project.

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Is there a standard way to describe devices?

I'm new to Arduino. I'm curious whether there is a standard way to record the plan of a device—for instance, if I wanted to share it or communicate the design to other people. I realize the short ...
adam.baker's user avatar
0 votes
1 answer
767 views

does EEPROM reset itself when a new code is uploaded?

I have a Nodemcu with which i'm doing a project. So whenever there is a power loss i want values of some of the variables to not be reset, because of that im trying to store the values in EEPROM of ...
rohithrathod banoth's user avatar
1 vote
0 answers
369 views

Problem with floating of AnalogRead

For a university Lab course i have to realize a UPS unit with a internal LiPo battery . The unit uses as battery charger a buck converter I have only a problem with the battery charger (buck converter)...
Marco Toni's user avatar
2 votes
1 answer
167 views

What's the time out of Wire.begin()?

Here's a schematic of my project: The purpose is to make laptop work as keyboard for desktop PC. Nano uses Serial.read() to get keystrokes from laptop and forwards key press and release data to ...
chocolate's user avatar
1 vote
1 answer
211 views

Is it advisable to use Serial.write in an ISR when loop() routinely uses Serial.read?

I do not know much electronics. I have Nano v3 as I2C master, it reads 5-byte packets (of delimtted data) from PC's USB port, processes it and forwards it. I now need to implement a way to signal PC ...
chocolate's user avatar
1 vote
0 answers
52 views

Can I create an hemi-cycle raising signal with one pin and the other hemi-cycle signal with another pin?

I am new to Arduino, I would like to know if someone could help me to create this type of signal with the Arduino Uno. Many thanks!!
Edgar Hornus's user avatar
2 votes
0 answers
158 views

MKR Wifi 1010 Project Design

I am newer to microcontrollers and have my first project I would like to try. I have started to sketch out a basic design and would like feedback on things that I may be missed or over looked. I ...
Easton019's user avatar
1 vote
1 answer
136 views

Trying to use Nano Every as a sort of USB logic analyzer, but can't isolate it from "device under observation"

Here's the scenario: I have a radio that displays information on a 1602A LCD. The 1602A is plugged into a header so I can easily pull it out and instead plug in logic analyzer leads. The logic ...
Bezewy's user avatar
  • 121
1 vote
1 answer
375 views

Plant irrigation system

I'm very new to the Arduino game I wanted to make a small auto watering system for my plants. I bought these items 5V 1 CHANNEL RELAY MODULE FOR ARDUINO PIC AVR DSP ARMB 9 VOLT BATTERY SNAP ...
Nizam mulk's user avatar
2 votes
0 answers
73 views

How to read .txt file from the internet wirelessly [closed]

I am a complete beginner to Arduino, so I'm asking this moreso to see if a project will be feasible. My ultimate goal is to have this arduino (whenever powered) check this website "https://services....
A.K.'s user avatar
  • 21
0 votes
1 answer
801 views

Build an improved GSM antenna for arduino mkr gsm 1400

I want to use an Arduino MKR GSM 1400 in my area wich has a bad connectivity on mobile internet. On my phone it's very weak and if i drive to the next village it works sometimes on the arduino with ...
Cowboy_Patrick's user avatar
0 votes
1 answer
49 views

How to connect both MicroSD module and MPU9235 power in an arduino

I'm really new at electronics and wiring, so please be kind. Coding is my stuff, but I'm trying to learn something here. I'm working with a project to store the movements of a skateboard through a ...
Fabiano Araujo's user avatar
0 votes
2 answers
125 views

Relay with mechanical fallback

In my circuit I have a relay that will turn on some light bulbs this is my circuit: The switch over the 5V is in fact my Arduino. A HIGH will turn on the relay and a LOW will turn it off. This is ...
Nicos Karalis's user avatar
1 vote
1 answer
194 views

How to reset an arduino while being able to know which button has been pressed?

Context I keep the board in sleep mode and want to wake it with different buttons. I need to know which button has been pushed on boot. In the following schematic, SW-R is actually used to reset the ...
Remi's user avatar
  • 159
2 votes
0 answers
177 views

Boat project - object detection [closed]

My project is to control a dual motor model boat via bluetooth hand-held device. I am using an Adafruit feather 32u4 bluefruit LE and Adafruit DC Motor + Stepper FeatherWing Add-on. I am using the ...
Will Maynard's user avatar
3 votes
1 answer
957 views

Using AA batteries to power Arduino and GPS unit

I'm more of a software guy, so I need your help to figure out the power issue with my Arduino. What I would like to do is using a GSM/GPS unit (Ai-Thinker A7) with Arduino Nano as a car tracking ...
Sertalp Bilal's user avatar
5 votes
1 answer
168 views

Replacement crystal on Uno for cold temperatures

I want to run an arduino out in the cold (-40), and use the serial communication - I believe that the crystal is the weakest link (the one for the serial chip) - however I don't see any drop-in (...
user2813274's user avatar
6 votes
1 answer
15k views

Streaming audio from PC to Arduino over WiFi

Say I wanted to, purely hypothetically, set up a pirate radio station by connecting an Arduino to a WiFi network away from home, streaming music to the Arduino, decoding it, and broadcasting it with ...
Joris's user avatar
  • 163
2 votes
1 answer
1k views

"tamper" circuit of a reed switch: can I connect the two wires to an INPUT and an OUTPUT pin?

While working for the automation side of my new house, I'm currently in the process of installing several reed switches on top of external doors and windows. Even if this could be used as a "...
Damiano Verzulli's user avatar
2 votes
1 answer
10k views

How Master and Slave concept works with Bluetooth?

From what I understand the master has primary control over the slaves and communicates with them. A master must always be present as well, and can be connected to (up to) 7 slaves. Question If I ...
ITSUUUUUH's user avatar
1 vote
4 answers
784 views

Create a device to detect object state

Here is what I want to do or get it done (since I am not a embedded guy)... create a prototype with Arduino to detect open window/door of my room using camera(image processing/object state detection)?...
rushi121's user avatar
2 votes
0 answers
207 views

How to select a 0.1" header in Fritzing

Does Fritzing support the standard 0.1" break-away header? When I search for "header" in its parts database, I see several examples, and some even seem to reference 0.1 headers, but I can't actually ...
Cerin's user avatar
  • 1,648
1 vote
1 answer
356 views

Arduino and 127/220 Volts: Relay and Isolation

I am new to Arduino, also, I am not fluent in english. I wish to create a controller for several circuits. All of those circuits are "in parallel" with additional circuits. My question is: Do a ...
Bonatti's user avatar
  • 113
1 vote
2 answers
1k views

Powering arduino and 12V Fan from same supply

I have found a relatively small 12V switching power supply that I want to build into my device, using it to power both the Arduino Pro Mini and a couple of 12V cpu fans. Am I correct in assuming that ...
aelgn's user avatar
  • 113
0 votes
1 answer
78 views

Just sanity-checking a concept... poor man's self-monitored alarm system

If I wanted to throw together a simple burglar-alarm system that had wireless sensors talking to an Arduino (which would then send me an SMS message via cellular shield as a silent alarm telling me ...
keshlam's user avatar
  • 101
0 votes
1 answer
743 views

Fog Machine - On Command

I work with a marching band, and we want to use fog machines for a particular part of the show. I know how to code/program in Arduino, however I am not great in the electrical and technical end. I own ...
Tommy Yamakaitis's user avatar
0 votes
1 answer
64 views

Is it possible to make an arbitrary lake bottom generator?

I'm trying to generate an arbitrary lake bottom sonar returns using my Arduino. I would like to seed a function with a "depth." This would be the starting depth. I would then like to randomize a set ...
Samee87's user avatar
  • 135
0 votes
1 answer
95 views

safety for power electronics

I'm quite new to Arduino. I have build a number of projects successfully, like potentiometers, serial communication, DAC, sensors, motors etc. I use a laptop to power my Arduino project and Atmel ...
user avatar
2 votes
3 answers
4k views

Human circuit trigger

The main idea is to create trigger which can be switched on by touching 2 plates on opposite walls. And these should be performed by few peoples holding each other hands. Obviously human body has big ...
Alexander's user avatar
1 vote
1 answer
348 views

Very easy Arduino code challenge for you brainiacs to solve

I've searched the forum for similar problems and still can't see my obvious issue. I'm working on a simple Halloween prop and I'm using an Arduino for the first time. I've tested each individual '...
Mike Pasquariello's user avatar
0 votes
2 answers
890 views

Which sensor is best for obstacle detecting with retroreflector?

Distance is about 3m. IR or visible light - does not matter. It is possible that object/obstacle can be shiny, so for correct detection necessary large amount of reflected light. Maybe for this task ...
XuMuK's user avatar
  • 113
1 vote
2 answers
748 views

What to with reset pin when laying out Arduino PCB?

I'm designing a PCB with a standard arduino ATMEGA328 DIP IC. Do I need to make a connection to the reset pin?
blarg's user avatar
  • 167
0 votes
2 answers
87 views

What are the basic steps to make a printed circuit board?

I created a shield for Arduino on a soldering board. The next step shall be to implement the circuit on a PCB. I'm new to this, so I'd like to know what the basic steps in designing a PCB are. More ...
Huitzilo's user avatar
  • 121
9 votes
7 answers
39k views

How to remember variable values after rebooting an Arduino Uno R3 board?

Is there any way to store the values of necessary variables somewhere (may be in a file that gets updated by the program at various events), which can be read back when program starts after rebooting ...
Samik Chattopadhyay's user avatar
0 votes
4 answers
133 views

Arduino: Breadboards and PCBs [duplicate]

I just watched this excellent video tutorial that shows a simple Arduino program that toggles an LED via a pushbutton. Very cool! In the video, the author is using a breadboard for prototyping his ...
smeeb's user avatar
  • 509
3 votes
3 answers
6k views

Best Header for Arduino Nano

I would like to be able to create permanent projects with my arduino Nano but be able to remove the nano in order to use it in other projects. The arduino Nano has 30 pins so I would be looking for ...
NULL's user avatar
  • 820
2 votes
1 answer
1k views

AVCC and AREF when using a reference voltage lower than 5V?

I'm designing a circuit that will use a 2.5v reference for the AREF. Should AVCC be powered from 5V or 2.5V?
blarg's user avatar
  • 167
12 votes
3 answers
10k views

ATMega328P-PU and 328P-AU

im planing to make my very own arduino design based on the Arduino PRO mini. I picked this board instead of the UNO mostly because it's way more simpler compared with the UNO since the USB-to-Serial ...
Meletis Flevarakis's user avatar
2 votes
1 answer
4k views

Arduino Based Solid State Drive

I've searched high and low for something to get me on the right track, it's making me think it might not be possible. Basically, I want to create a cheap SSD using Arduino (or another microcontroller ...
Michael Brown's user avatar
21 votes
7 answers
26k views

Loading local libraries

I'm new to Arduino/C development (coming from a JavaScript/Ruby environment), but I was wondering if it was possible to include a library from a custom folder within a sketch? So this is my situation;...
Stefan's user avatar
  • 311
4 votes
5 answers
24k views

How can I run multiple programs on an Arduino?

I'm trying to get students to experiment with Arduino. However, due to a lack of boards, two teams of students will collaborate on each board. They will push their own code (independent from each ...
Giulio Muscarello's user avatar
2 votes
2 answers
638 views

Programming an Array of ATTiny

I am designing a board for my electronics project and i am using a number of ATTiny85 for it. The ATTiny's will be SMD so i will not be able to remove them for programming. Moreover all of the pins ...
Rishabh's user avatar
  • 33
-1 votes
1 answer
424 views

What is the best way to establish wireless communication between the Lilypad and a Mac?

I want to build a wearable device for a dancer using the Lilypad and I need to first send the programme from my Mac to the Lilypad board and then transfer the data read by sensors back to my Mac. I ...
Jen's user avatar
  • 15
1 vote
1 answer
6k views

Washing machine controlled by Arduino for homebrewing

So, this question might sound a bit silly at first glance (no, I know, it sounds flat out insane), but not all that silly at second. I have heard once about a guy who transformed some (presumably old-...
Delltar's user avatar
  • 113
2 votes
1 answer
5k views

Can I use the setup() function inside the loop() function

In the normal case the setup() function will be run once automatically and and then the loop() function will run many times. I want to initialize several modules in the setup() function and then in ...
vladiz's user avatar
  • 121
7 votes
1 answer
10k views

From transfer function to arduino

This question might seem stupid, but I have been curious about it for a long time. So I am a new engineering student, and we learned a lot about "designing a controller". For example, design ...
MechAvia's user avatar
  • 171
2 votes
2 answers
10k views

Use potentiometer to control motor's speed

Following the arduino starter kit, one of the projects uses a push button to on/off a motor. In the end they suggest to try to use a potentiometer to control the speed of the motor. I already did it, ...
blfuentes's user avatar
  • 221
1 vote
3 answers
365 views

What is the simplest way to "ask" the arduino which input pins are HIGH?

I am trying to build a 36-line cable tester, using the Digistump DigiX (99 i/o pins). Digital pins 0-35 are outputs, connected via the cable in question, to (in a perfect world) digital input pins 36-...
user4057's user avatar
1 vote
1 answer
6k views

Using Arduino to control a 12v car light system?

I am new, but I am wondering what options I may have to control a 12v line that connects to a light with Arduino i/o. Given the voltage limitations of an arduino, I am thinking using some kind of 5v ...
Vigrond's user avatar
  • 113
2 votes
2 answers
2k views

Exoskeleton Motor Control Code

Background: I have been working on an exoskeleton project with a group of friends, and I need help. I made another post on the robotics.stackexchange site for the drive system: https://robotics....
Joel's user avatar
  • 523