Linked Questions
20 questions linked to/from What are the Electrical Specifications of GPIO pins?
83
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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?
- 61k
6
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2
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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, ...
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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 ...
- 33
3
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2
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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 ...
2
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2
answers
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Multi-Joystick (Joystick, rotary Encoder, push Button) to GPIOs
I'm trying to connect a Joystick/Encoder/Button (Copal Electronics CJ25) to a Raspberry PI. Using gpiotest I managed to get it up and running pretty well - using 3.3V input (though the data sheet ...
- 33
2
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2
answers
389
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Short pulse detection about 35ms, is it possible
I got somewhat short pulse 35ms, I written script in python using RPi.GPIO, using event and callback. Is it possible to detect so short pulses? On related question how close to 3V3 I need to get? I ...
- 79
1
vote
2
answers
735
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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 ...
- 19
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2
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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 ...
- 1,063
4
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1
answer
1k
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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 ...
- 81
2
votes
1
answer
2k
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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 ...
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1
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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 ...
- 458
1
vote
1
answer
906
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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 (...
- 11
1
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1
answer
741
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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.
- 61
1
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1
answer
1k
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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?
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1
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GPIO only reaches 2,4v when high
TLDR; Under little load the GPIO 22 reaches 3,5v whereas under more load it only reaches ~2,4V, which is not enough to trigger the reset-line on an ATMEGA328P. UART GPIO Pins still reach 3,3V in both ...
