Linked Questions

1
vote
1answer
762 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 (...
1
vote
1answer
579 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.
65
votes
2answers
68k 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?
13
votes
3answers
10k 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 ...
5
votes
2answers
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, ...
3
votes
4answers
2k 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 ...
4
votes
1answer
588 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 ...
3
votes
2answers
842 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 ...
1
vote
1answer
634 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 ...
1
vote
1answer
570 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?
2
votes
2answers
229 views

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 ...
1
vote
1answer
337 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 ...
0
votes
3answers
169 views

How to choose appropriate transistor and resistor values for the 4 digit display?

I bought this 4 digit led display I'm looking at this tutorial and I don't understand why he used such big resistor for his circuit. Excerpt: Please note that the pinouts of LED displays vary ...
1
vote
2answers
147 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 ...
0
votes
5answers
108 views

Connecting 5V / 2A DC adapter positive line to GPIO

I have a working DIY UPS for my Raspberry PI 3B board. My requirement is that whenever the main power goes off the PI, the software should be able to detect it and immediately trigger a graceful ...

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