All Questions
17 questions
-1
votes
1
answer
42
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Does Pi draw more power when GND is connected to pin 16?
Strange question perhaps, but I was wondering if anyone knows if a Pi would in theory consume more energy when the GND pin is connected to pin #16? I have an interactive piece of software running on ...
- 101
0
votes
0
answers
43
views
How to disable boot when plugged to power? [duplicate]
I want to disable boot of raspberry pi 4B when plugged to power
I have searched a lot and found a similar question, which gives a short and suspicious answer to this problem. If two RUN pins(holes) ...
- 9
1
vote
3
answers
882
views
power the logic circuit of an external component with an external power supply instead of the raspberry pi's GPIO
I want to know if is it possible to power the logic circuit of an external component used with raspberry pi not in the way shown below (using the 3.3v or 5v ang GRND GPIO),
but with an external 3.3v ...
- 109
0
votes
2
answers
1k
views
Rpi Zero W ( not Rpi 2,3 ) - power consumption, idle and GPIO operate [duplicate]
Spec wise - all raspberries require 5v 2A input.
My project needs multiple remote rpi’s to send periodical status of GPIO using python script ( runs on Raspbian Strech Lite ).
Is a 2A a must ?
- 588
1
vote
0
answers
53
views
How to determine from hardware, when I can shut off a Raspberry Pi 3
I am wiring up a raspberry pi to use a battery supply and I would like it to be a single switch controlling its power. Obviously, I don't want to cut power when its running, but I also don't want two ...
- 111
0
votes
2
answers
2k
views
Converting 24V to 5V for GPIO power supply
in my project I have to power the Raspberry pi over the GPIO port. I know that the voltage must be regulated to 5V.
My input is 24V so I have to convert it to 5V.
I'm currently designing a PCB with ...
- 107
5
votes
2
answers
2k
views
When to power GPIO projects from external power source?
I am working on a home automation project using:
rPi 3 with 2.5 A power source
3 x MCP23017 for GPIO port expansion
3 x 8 ch solid state relay board by Sainsmart
20 x physical wall switch
(future) ...
- 53
4
votes
1
answer
6k
views
Control 5m of WS2812 LED Strip: Wire it up
I want to control 5m of WS2812 LED Strip with my Raspberry Pi, which will be placed around two Ikea Billy shelves. I read some articles and tutorials regarding this topic:
http://popoklopsi.github....
- 45
1
vote
2
answers
3k
views
Check if current if flowing through 220v ac wire
I want to add a third switch to a room with two existing switches.
This third switch will be simulated by a 4 relays and a raspberry pi.
Image source: wikipedia, Multiway_switching
So 1 have one ...
- 11
2
votes
2
answers
1k
views
Power up from USB Cable or GPIO?
I have made a battery pack to power up my Raspberry Pi 3 for a project. The pack uses 2 Samsung ICR 18650 Li-Ion batteries (connected in series) and a 5V 3A UBEC and gives 5.05V output.
Now I'm a ...
- 303
4
votes
2
answers
3k
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 ...
- 6,365
3
votes
2
answers
2k
views
Does it matter which pins are used when powering the Pi from the header?
If you didn't already know, you can power the Pi from the GPIO pins. By supplying pin 2 with 5v and connecting a ground to pin 6, you can power the Pi. My question; does it matter which pins are used? ...
- 6,365
1
vote
1
answer
171
views
Faint PWR LED, doesn't boot
I've just installed Raspbian to my new RPi2 B+. Shutdown and connect Adafruit Neopixel Ring (3 connectors: 4th pin - 5v, 6th pin - GND, 12th pin - DATA IN) and boot the RPi. Then it has reset itself ...
3
votes
3
answers
6k
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, ...
- 2,281
1
vote
2
answers
2k
views
Increase raspberry pi voltage
Say I bought you a RC car as a gift, that works on 24v battery. You decided that RC car is boring and want to control it with raspberry pi 2. There are two motors on the car.
You bought a voltage ...
- 257
5
votes
1
answer
6k
views
Controlling Servos with a Raspberry Pi
I am not sure if this will break my Pi, so I decided to double check
In this image is a simple servo connection, I am still learning how servos work. I actually have two questions:
If I decided to ...
- 123
5
votes
2
answers
12k
views
How many volts can you safely connect to the Pi?
I want to purchase this power supply (battery pack) for mobile projects (I know, it isn't a lot of power), and I was wondering if, with a bit of modding, like adding a micro usb tip to the power or by ...
- 3,021