Linked Questions

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
  • 60.5k
8 votes
4 answers
24k views

How to program active cooling connected to GPIO

I have Raspberry Pi 3b+ with the case, which has a small 5v fan, which is connected to GPIO. Look to picture below: The Fan runs continuously, but I don't want continuous operation. I want the fan to ...
romankh3's user avatar
  • 165
11 votes
2 answers
25k views

What are the max current rating for 3.3v and 5v rail of the Rpi 4B

Does anybody know the max current rating of the 3.3v and 5 v rail of the new raspberry pi 4? i could not seem to find anybody benchmark this, i have read from someone that the new RPI 4 has a new ...
Jack's user avatar
  • 686
7 votes
3 answers
65k views

Using single 5V relay (jqc-3ff-s-z) - safety advice required

Above is relay I'm using and everything works as expected using diagram below. I will add 1n4148 diode on IN line for safety and will connect VCC to power supply before Pi. Can I use ground (GND) ...
goodevil's user avatar
4 votes
1 answer
6k views

Can you use a 5V Relay Module with the Pi?

Can you use a 5V Relay Module or similar with the Pi?
Milliways's user avatar
  • 60.5k
2 votes
3 answers
2k views

Raspberry Pi Relay Protection [closed]

I took a picture of my mock setup to give a better idea of what I'm working with. Basically, I'm will be using relays connected to my Raspberry Pi that I intend to use to control a series of lights (...
Dave's user avatar
  • 23
1 vote
3 answers
2k views

Powering RPi 4 Model B with 5v 3A Car Power Supply Module

I would like to use a buck converter between a 12V DC power supply and my RPi4, and found this car power supply to be appealing. It claims to step down from 12V to 5V 3A, which is almost the same as ...
YumekaMengjiaLYU's user avatar
1 vote
2 answers
430 views

Reliable 5v relay

I have been using raspberry pi for my home automation project. To control 12v power, I use 5v relay low triggering to turn on or off the power. My coding and connection work fine. Problem is ...
Chuljung Kwak's user avatar
-1 votes
1 answer
1k views

5V relay (jqc-3ff-s-z)

Is it possible to use an external adapter for the 5V, so connecting the + from the adapter to VCC of the relay and the - of the adapter to GND of the relay. Then IN to GPIO27. Setting this low will ...
Lodv's user avatar
  • 1
1 vote
3 answers
425 views

4 relay board weird behavior

i'm new to this platform, I hope I'm doing everything right. I bought a 4 relay board some time ago to use it with my pi. When I tested it with the pi, it worked well. After a while I decided to use ...
Dj Igiul's user avatar
-1 votes
2 answers
543 views

Problems with the rpi zero and relay [closed]

I Have a problem... (above the relay-coil Datasheet) I want to control a single relay with my pi zero, but it seems that it doesn't have enough power. the 3.3V pin of the rpi (measured to 3.19V) works ...
Nilusink's user avatar