Linked Questions

1 vote
1 answer
906 views

Output/Input Voltage/Curent of RaspberryiPi 3 B [duplicate]

I looked everywhere but i didn't found a good answer. I'm looking for the specifications of my RaspberryiPi 3 B because i need to connect it with many sensors like LDR sensor or Distance sensor (...
Aziz zeGeek's user avatar
1 vote
1 answer
741 views

RPi 3 3.3v GPIO normal current [duplicate]

so I've read around forums that the max current from a RPi 3.3v GPIO pin is 50 mA, but since it is the max I don't know if I should take a resistor for 50 mA or for a lower current.
Iliyan's user avatar
  • 61
-1 votes
2 answers
85 views

Can a gpio pin be read as an input without voltage going through? [duplicate]

I have pi 3 and I want to use one of the pin as an input. It will be connected to tapped off wires from a switch that has 2 volts going through it when it is closed. So I want to feed this 2 volts as ...
ThN's user avatar
  • 1,063
83 votes
2 answers
123k views

Raspberry Pi Power Limitations

There are very many, often contradictory, claims about the power requirements and limitations of the Pi. What are the exact requirements?
Milliways's user avatar
  • 60.7k
14 votes
3 answers
13k views

Maximum current on each GPIO pin for Raspberry Pi 3 Model B

Anyone knows what's the maximum input/output current for the individual GPIO pins? Perfectly fine if someone is able to point me to the Broadcom BCM2837 datasheet, which I for some reason, cannot ...
Russell Sim's user avatar
4 votes
4 answers
8k views

Raspberry Pi GPIO input voltage Limit

I am doing a project in which I have a component that outputs a 5 Volt signal. Since the Pi is only able to handle 3.3 V I connected the signal to a voltage divider. I used a 4.7 kiloOhm and a 2.2 ...
adriankroeger's user avatar
3 votes
3 answers
2k views

GPIO input and output levels

I have some basic questions, sorry, I have'nt found this. What are output levels of GPIO (Raspberry Pi) I mean the voltage ranges of low and high for input/output What is the maximum current that ...
Tomas's user avatar
  • 47
4 votes
1 answer
1k views

RS232 to Raspberry Pi Zero W

I know this may be a dumb question but can you connect a RS232 Tx, Rx, and Ground from a device directly to the Rx, Tx and Ground on a Raspberry Pi Zero without having to get a Max3232 or something ...
Michael H.'s user avatar
6 votes
2 answers
3k views

Electrical characteristics of GPIO

Is there a spec sheet anywhere which lists the electrical specifications for the varios GPIO pins on the RPi revision B? For example, if they are open collector etc, output voltage, max input voltage, ...
Jodes's user avatar
  • 562
3 votes
2 answers
1k views

Do I need a base resistor for a transistor? [closed]

All I plan to drive a 51 ohm LED using the pi's 5v pin using a 2n2222 transistor connected to the GPIO. Do I need a resistor on the base pin of the transistor or can I connect it directly to a GPIO ...
Nujra's user avatar
  • 33
2 votes
1 answer
2k views

GPIO Voltage tolerance for input

I have not been able to find the input tolerance on I/O pins, especially on the Input pins. If I apply a voltage 3.6v (3.3v +0.3) on an input will it be dangerous or is it ok ? Does somebody have a ...
morbak's user avatar
  • 121
3 votes
2 answers
2k views

What is the minimum current value into the Pi's GPIO input?

What the minimum current input that must be provided to Pi's GPIO input in order to get high value? The idea: I will be adding Microwave Doppler which output are in micro amperes. I want to know if ...
Audrius Gailius's user avatar
1 vote
1 answer
2k views

Precision of Raspberry Pi GPIO outputs voltages [closed]

Raspberry Pi has several output voltages, GPIO outputs theoretically giving exactly 0V for False and exactly 3.3V for True, 3.3V line and 5V line. However, how precise are these outputs? Can the ...
Pygmalion's user avatar
  • 458
1 vote
2 answers
719 views

Lots of LEDs in a chain

I need to control about 90 LEDs with a Raspberry Pi. I am thinking of doing with with 3 chains of 30 LEDs, so I can control each set of 30 LEDs independently (turn 30 on and off at a time) and change ...
Matt B's user avatar
  • 19
1 vote
1 answer
1k views

Pi GPIO with 1.8 Volt input [duplicate]

Does anyone know will the Raspberry Pi 2 GPIO pins count a 1.8V input as logic one or logic zero?
Carlos Frank's user avatar

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