Questions tagged [safety]

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

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circuit breaker/fuse necessary for IoT home monitor?

In most 12v CCTV power supplies, each power cable is behind a glass fuse. I haven't seen fuses or circuit breakers used when distributing 5v power used in IoT projects. Is there a reason overcurrent ...
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Is Arduino Mega Hackable Over The Air

After reviewing similar topics I've decided to ask this question below in the Security Stackexchange forum about 11 days ago. https://security.stackexchange.com/questions/235423/is-arduino-mega-...
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1 vote
3 answers
276 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 ...
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4 answers
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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 ...
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1 vote
2 answers
969 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 ...
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1 answer
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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 ...
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335 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 ...
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7 votes
2 answers
160 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 (...
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1 answer
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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. ...
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1 answer
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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 ...
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1 vote
3 answers
673 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 ...
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1 vote
2 answers
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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? ...
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1 answer
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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?
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2 votes
3 answers
459 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 ...
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3 answers
208 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 ...
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1 vote
3 answers
3k 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 ...
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2 answers
278 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 ...
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3 votes
3 answers
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 ...
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3 votes
3 answers
8k 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 ...
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1 answer
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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 ...
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1 answer
163 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. ...
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1 answer
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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 ...
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9 votes
5 answers
17k 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 ...
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2 votes
2 answers
548 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 ...
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2 answers
215 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/...
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3 votes
0 answers
188 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. ...
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2 votes
2 answers
327 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 ...
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1 vote
5 answers
2k 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 ...
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-3 votes
1 answer
853 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 ...
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5 votes
3 answers
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 ...
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27 votes
2 answers
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?
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8 votes
1 answer
802 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 ...
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16 votes
5 answers
22k 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 ...
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6 votes
4 answers
1k 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 ...
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15 votes
6 answers
68k 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 ...
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0 votes
1 answer
3k 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?
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26 votes
3 answers
6k 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 ...
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11 votes
2 answers
6k 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 ...
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13 votes
3 answers
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.) ...
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16 votes
3 answers
2k 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 ...
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12 votes
3 answers
684 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 ...
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