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Questions tagged [safety]

The safety tag is for the well-being of the people and objects around you, and yourself.

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27
votes
2answers
10k views

Arduino USB Power vs External Power Supply

Why is the Arduino able to accept ~5V from the USB, but requires a min of 7V when using an external power supply?
23
votes
3answers
5k views

What happens to the Arduino if you don't use a resistor with an LED?

Making a blinking light seems to be one of the most common beginner projects with Arduino. A typical approach is to connect an LED + resistor (in series) to an IO pin, and connect the other end to ...
16
votes
3answers
1k views

How to prevent breaking my Arduino by mistake?

What is the best practice to make my Arduino circuit more robust against prototyping mistakes (like shorting pins)? I don't want the controller to release its blue magic smoke while experimenting with ...
15
votes
6answers
50k views

How do I erase the memory of the Arduino Uno?

I'm just a tinkerer learning Arduino with my son and I was surprised that when I plugged the USB cord back in to the Arduino the program was still running and I thought to myself, "it's a good thing I ...
15
votes
5answers
17k views

How cold or hot can my Arduino Uno get?

The Arduino Uno Page doesn't say the temperatures that it can operate in. I'm thinking about placing it outdoors. How can I make sure my Arduino Uno is safe in weather that can reach -20 to 105 ...
12
votes
3answers
592 views

How do I figure out if my board is approaching end of life?

I have a uno that I have been using for 3 years now. I will be using it again in a rather critical project in which failure on the part of the board could be rather expensive and dangerous. So, I ...
11
votes
2answers
3k views

What I should be aware before I touch my Arduino?

Before you start to mess with a computer there are basic guidelines to be aware of, such as turn the power off and watch out for static electricity. What guidelines should I be aware of when I work ...
11
votes
3answers
2k views

Washable, Wearable Tech with Arduino

Question: How does one prepare clothing with embedded electronics for washing? Background: There are several Arduino boards/clones that are designed for "wearable tech." (For example, the Lilypad.) ...
8
votes
5answers
14k views

Reasons why it is not OK to connect a relay directly from an Arduino digital pin

After looking into various schematics on controlling a relay via an Arduino, I have noticed that, most of the time, transistors are used to switch the separate supply into the relay coil rather than ...
8
votes
1answer
770 views

Can I program a 3.3v chip on a 5v board?

I bought a Gertboard a while ago, and one of the features it has on-board is an ATMega328 (DIP). However, since the Gertboard is designed for use with the Raspberry Pi, it only operates at 3.3v, so ...
7
votes
2answers
91 views

How can I differentiate between multiple circuits?

I'm building a puzzle for an escape room. I want to give the user 6 wires and 6 terminals, then confirm that they've connected the correct wires to the correct terminals (one-to-one). My first (...
5
votes
4answers
738 views

Can you fry an arduino with nothing plugged in to it?

I only get to work on my arduino every few weeks, so sometimes and get interrupted a lot by small children, so if I completely forget what is on the firmware, then I unplug the pins (because I haven't ...
4
votes
3answers
2k views

Can I corrupt my Arduino if it's unplugged during an upload?

When messing around with code and uploading a sketch to my Arduino board, I almost accidentally pulled out the USB cord. Everything is fine, but then I started thinking what would've happened if I had ...
3
votes
3answers
6k views

ESP8266: Is it safe to use pin 0?

This (maybe stupid) question is bothering me for a long time... If the pin 0 has to be connected to the ground for uploading a sketch into ESP8266, and after the uploading the chip automatically ...
3
votes
3answers
2k views

How to remove SD card safely

I’m constructing an arduino based sytem that uses a SD card and I’m looking for a way to safely remove the card from the system during operation. One way would probably be to turn of the arduino ...
2
votes
3answers
418 views

How safe is it to use my body as part of a circuit?

I have two polystyrene balls wrapped in copper tape. When the balls touch, the tape completes a circuit from a digital pin on an Arduino inside one of the balls to an Arduino inside the other (both ...
2
votes
2answers
243 views

Can I use relays with 10A125V~ for my 220V~ applications, safely?

I am using the TinkerKit Relay Module and recently they changed the relay mounted on the board from a white one with 10A250V~ to a black one with 10A125V~. In my country the voltage is 220V~. Can I ...
2
votes
0answers
161 views

9v adapter burned out Leonardo style board

My first experience with Arduino ended in a tragedy. I bought a Leonardo from ebay and upon arrival, attached it to my laptop. Programmed a simple blink demo with the onboard LED. It started working. ...
1
vote
5answers
1k views

Do Arduinos meet military standards?

Do Arduinos meet military standards? If not, where does it fall short? Is it something internal to the chip which might be corrected via external circuit? How could I evaluate the potential of a ...
1
vote
2answers
118 views

Is it safe to power Arduino project using a power bank and wall charger?

I got an Arduino project that need a constant source of power. Rather than dealing with batteries, I want to use a power bank like this: Better yet, I want to keep the power bank plugged in to the ...
1
vote
1answer
112 views

Am I able to connect an anti static wrist strap to the ground pin on the Arduino uno?

So you have the pin on the arduino uno which is ground, are you able to use a jumper wire to send the ground source out the other end of the wire to the alligator clip for the antistatic wrist strap?
1
vote
2answers
301 views

Improvement security in a domotic project

I recently started with a domotic project, I began creating a lock opening with a RFID currently I'm trying improving the code (I took from http://forum.arduino.cc/index.php?topic=256260) but I have ...
1
vote
0answers
171 views

How can i prepare for short-circuit between 5V and GND pins?

My Arduino Uno controls a couple LEDs in a watertight enclosure. I'm running wires from ground, a data pin and the 5V pin into the enclosure. The Arduino is powered through the DC jack. What measures ...
0
votes
1answer
2k views

What will happen if I give my Arduino Uno more or less than 5 volts? [closed]

Will it still run on less than 5 volts? Will it break?
0
votes
3answers
128 views

How to prevent ATTiny program from running after I flash it with Arduino?

I am making a simple voltage regulator. The whole idea is to just use ADC to read voltage on output side and based on the result, adjust PWM power. I am using PWM on physical pin 5. That's the same ...
0
votes
1answer
34 views

Different voltage sources across Vin and DC jack

So I understand that the USB VBUS circuitry turns off provided there is a high enough vin voltage using the PFET and comparator. I can see that the DC jack is connected to the Vin pin via a diode. ...
0
votes
3answers
2k views

Arduino relay. risks?

I just started working with arduinos recently. I'm really interested in working with relays. I would like to turn a desk lamp on and off using an ios app or a web browser button. I have no experience ...
0
votes
1answer
117 views

Measuring voltage on an analog pin - What do I need to know about amperage?

I'd like to measure the voltage at a test point on a stepper motor driver chip with an arduino. The voltage at this point controls the amperages to the phase coils and is adjusted to trim the driver. ...
0
votes
1answer
82 views

Arduino Analog pins go all to high problem

I was taking measures from the outputs of an OpAmp when all the sudden measure 5 volts from all pins of the Arduino Mega for no reason. I disconnected the Arduino and loaded the Firmata and test. All ...
0
votes
1answer
1k views

What is a safe way to power arduino nano with 7.4V Lipo battery?

I'm trying to power Arduino Nano with 7.4V LiPo battery and use it to run 2 DC motor using L293D. I have figured out how power it with the connection just like in the figure below(the diagram uses Uno ...
0
votes
2answers
225 views

How to handle low temperatures using Arduino Uno?

I want to create a simple electronic temperature sensor using the Arduino Uno. The environments I want it to handle is inside a fridge and near a heater. Although I am sure the Arduino can easily ...
0
votes
2answers
169 views

How do I replace a burnt atmega328 with a new atmega328(bootloaded) in arduino?

I have an arduino UNO with atmega 328 whose microcontroller got burnt. I bought a new atmega328. I have another working arduino with atmega8. I followed the instructions in http://arduino.cc/en/...
0
votes
1answer
1k views

Arduino OOP and [this] keyword

Lets say I have a sketch called mysketch.ino with these contents: String globalString = "ThisisGlobal"; void setup(){} void loop(){} How can I pass THIS sketch mysketch.ino as an object or its ...
0
votes
1answer
291 views

Arduino Uno pin dead for no reason. Why? [closed]

After struggling with an LCD showing rubbish characters on my previous post, I found that my pin 5 was dead, for no reason. I never connected it to anything except the LCD - I bought it two days ago. ...
0
votes
1answer
29 views

Verifying the timing between relay activations

I would like to verify timings of a relay controlled by an arduino (uno R3). There is a lot going on in the sketch and it does not use the delay function but one which is based on counting ...
0
votes
3answers
52 views

arduino circuit review/ safety review

I have the following circuit It has a simple dc motor that is OFF, and switches ON once a day for 2 seconds. I use MOSFET IRF540N as a switch I use L7805CV as a voltage regulator I would like to ...
0
votes
4answers
78 views

Detect if laptop is on or not?

How would I safely connect an Arduino so that it can detect if a laptop is on or off? The Arduino would be powered separately by a normal USB charger, since it needs to be turned on even when the ...
0
votes
0answers
42 views

Is successively toggling power on and off bad for microcontrollers

Does successively turning power on and off damage an Arduino or Adafruit Audio FX Sound Board in long or short term? I build a "fairy phone" out of an old rotary phone, an Arduino Pro Mini 3v3/8Mhz, ...
0
votes
2answers
74 views

How to select hardware for my Arduino board?

As I embark on my first Arduino project, I have lots of questions. Specifically, what considerations should I make when selecting equipment, and what are the critical parameters to safe operation? ...
-1
votes
1answer
100 views

Creating an ohmmeter that can safely measure the resistance of a finger [closed]

I’ve been searching around in a lot of Arduino communities, but have not found a comprehensive multimeter with leads much like a DMM. I am trying to make an ohmmeter that can safely measure the ...
-1
votes
3answers
339 views

What not to do to an Arduino [closed]

I may have been working with my Arduino UNO board improperly, because now it fails to upload sketches (says some programmer is not responding) and when I press the cute little restart button, the ...
-3
votes
1answer
703 views

Did I burn my Arduino UNO?

I've recenly bought my first Arduino uno and I was messing with DC motors. I put on the prototype shield on arduino with a mini breadboard on it. I was using L293D bridge. I've connected everything ...