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Questions tagged [voltage-protection]

Use this tag when referring to circuit or component for voltage protection.

37 questions
11
votes
4 answers

Powering Arduino Uno from 5V pin, what exactly is the voltage range/tolerance?

I want to bypass the onboard regulator and use the 5V pin to feed arduino with external, regulated source. Everybody just keeps saying regulated 5V, but how precise does the regulation need to be exactly? Can you state a voltage range and what makes…
jediz
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8
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3 answers

Can I use arduino's 3.3 V output directly to esp8266?

I just bought esp8266 and ftdi usb driver, I want to power the esp8266 with Arduino's 3.3 V output, is that possible? I saw some tutorial on youtube in that they are suggesting us to use 3.3v regulator ic instead of directly power 3.3 V of Arduino…
Satheesh Kumar
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5
votes
2 answers

Analog read negative voltage inbuilt protection

I'm trying to read a -10 to +10V analog signal on my Arduino Mega (2560). I've been using a voltage divider to obtain a -5V to +5V signal (with two 10kOhm resistors), which used to work just fine. I'm wondering if this -5V signal can damage the…
Etienne P.
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4
votes
2 answers

Is my Arduino possibly broken?

We work in groups on a project at school. We had to build an electric scheme with an Arduino to make a small car moving. We got the parts from our school, except the Arduino (we had to buy it ourselves). We had to use a battery of 11.5 V. We also…
user28055
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3
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1 answer

Mega 2560 & smoking/burning 5v requlator, probable cause?

Problem: board seriously fried. Desired outcome: measures to take in future. Background: This project has been running for about a week on the 2560, and previously for a few weeks on an UNO clone. Board switch a result of program size/expansion. It…
KC Tucker
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3
votes
1 answer

Power arduino from 5v rail of pc molex

I'm building a small device using arduino that should be connected to my pc via a usb header to exchange data with the PC. What I'd like to achieve is that arduino turns on when the pc is on, whereas it shuts down when the pc is turned off. If I…
xanz
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3
votes
1 answer

best way to protect a digital or analog input from 12volts

At work, I have connected an Arduino to a security key (which has a 12v power supply) in order to give us a more versatile door lock. Unfortunately, people keep removing the key pad, disconnecting the wires and re-connecting them (defective keypad…
Hoytman
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2
votes
2 answers

Grounding for arduino, measuring phase controllled 240V

I would like to measure a phase controlled 240Vac waveform as a digital PWM input for an arduino. The signal would look something like this: My intent was to use a zener clipping circuit to limit the positive portion of the waveform to 5V, and…
mrmojo6
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2
votes
2 answers

Two voltage sources on the same circuit

I am looking to power a Trinket Pro 5V microcontroller using a 9V voltage source. I have logic running on this controller to gather the data from an accelerometer (powered off of the 5V pin on the controller) and output it to three strands of 21 RGB…
ksenia
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2
votes
2 answers

The 3.3 volts of the USB To TTL

I'm using ESP with USB to serial converter (D-SUN) is it possible to use the 3.3 volts of the USB instead of the Arduino Uno?
nohier hassan
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1
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0 answers

What may have happend to this arduino NANO?

Accidentally I just short circuit my arduino nano, using a led neopixel, between the 5vOutput with one of the data pins. Now the pc doesnt recognize the device when I connect it. In the device (a NANOV3.0). Only the PWR(POWER/ON) led is light up,…
RodParedes
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1
vote
3 answers

Continuous voltage on IO Pins while 5V is not Connected?

i have a small project where i just sucessfully destroyed my frist of 5 Digisparks (Attiny85). In the Picture you see the Cirucit. I have 2 Liion cells connected in series to get high enough voltage to step it down to constant 5V. To these 5V some…
KidCe
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1
vote
2 answers

Connect Arduino Uno RX/TX to 3.3v NEO-M8N gps module

I'd like to connect an M8N gps module to an Arduino Uno. From what I understand the Arduino pins 0-RX/1-TX work on 5V the M8N RX/TX work on 3.3v the sensor-TX sending to the Arduino-RX should work (3.3v is “good enough” to drive the…
kalmiya
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1
vote
1 answer

Are the output pins on the 74HC595 shift register protected against shorting?

In the following schematic you can see that Q1 and Q4 both are connected to a Arduino's Digital Input Pin. So if Q1 is high and Q4 is low, would there be current flowing from Q1 through Q4 (and through the chip) to Ground - or is there already some…
Liam
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1
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2 answers

Correct Capacitors to use with L7805 Voltage Regulator

I am making my own arduino. I am in the process of hooking up power to the Atmega328. In both these articles they use the L7805 voltage regulator with two 10uF…
denver
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