Linked Questions

-1
votes
1answer
144 views

LEDS Connected to GPIO [duplicate]

How many LEDS can be connected and ON at once to the RPI GPIO without burning out the system?
0
votes
0answers
29 views

Provide power via GPIO [duplicate]

I have a RPi2 with a touchscreen attached. All the supply pins are covered by the screen jumper. I'd like to set up a small thermistor circuit. My question is - can I use a standard GPIO pin set ...
76
votes
2answers
95k 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?
4
votes
2answers
16k views

How To Switch On/Off A Circuit using GPIO

I have a simple circuit that runs on 5 volts. Let's just say for simplicity that it is a circuit with an LED that lights up when a push button is pressed. The problem is that it has a push button ...
6
votes
4answers
13k views

Raspberry Pi LED current limit

I've got an Raspberry Pi and I want to control some LEDs. I've read that the maximum current at the GPIO pins should be less than 50mA. But each LED uses 20mA. Does that mean that even three LEDs are ...
8
votes
3answers
3k views

What is the nominal GPIO Pin Output current?

What is the RPi GPIO Pin output current? I assume it's more than 10mA since it can drive LEDs without any problem but what is the spec?
3
votes
3answers
5k views

How to control a 3V laser from GPIO

What's the best way to control (turn on and off) a low-power 35mA 3V laser from a Raspberry PI GPIO pin? The RPi GPIO pins support the right voltage but each can supply only a maximum of about 16mA, ...
2
votes
2answers
9k views

Can I boost up the GPIO 5V output to 12V

So, I have a thesis to do where I need to use a Raspberry Pi 3 model B. In the Raspberry Pi, I will need to run a Matlab/Simulink simulation that will give me some results as output. Then I need to ...
4
votes
2answers
2k views

Is there a max current that can be supplied when powering the Pi from the pins?

I want to power my Pi Zero from the header pins, pin 2 and pin 6 specifically. I know that my Pi Zero can consume up to 120mA, and my power supply can provide up to 500mA. I've heard that the 3.3v ...
3
votes
3answers
2k views

what is the maximum number of GPIO pins i can expand with rpi 3 and how?

I need more than 250 individual pins for my project.(can't use multiplexing). so how can i get them? is there any good efficient and low cost modules for that. can MCP27017 do this?
3
votes
2answers
634 views

Safe operating parameters for GPIO pins

Recently I have started using the GPIO pins more frequently and am a little bit wary of frying them. I read an article here about 10 ways to fry an Arduino. Since the pi has 3.3v logic and I believe ...
1
vote
5answers
3k views

RPi3B crashes randomly

Help needed with this, I've run out of ideas. My RPi3 crashes randomly. - Power supply 2.0A - nothing connected to GPIOs - HDMI, USB mouse, USB-keyboard and LAN are connected - SD card is Sandisk ...
3
votes
1answer
2k views

Not getting 3.3v from GPIO Pin

I hope this is the right place to ask this kind of question. I'm quite new to this, so I expect there is a simple explanation. Basically, I have a small electro magnet (the type from an old doorbell)...
1
vote
1answer
2k views

GPIO Buzzer. Not sure how to do this

Buzzer (all it says on the back): 3 VDC, 15 mA, 75 dB I have a simple breadboard circuit with a LED that works. I'm now perplexed (again, I know zero about circuitry) how to add a working buzzer. ...
0
votes
2answers
1k views

Control physical switch with raspberry pi and read the state of the switch

Hello i have a lamp thats opens and closes from a switch. I want to add the functionality to open and close it from both raspberry pi and switch. I read in some posts to add a relay with multiway ...

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