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votes
1answer
56 views

Is it possible to toggle 3.3V and 5V header pins on and off? [duplicate]

Header Pins 1, 2, 4, 17 are labled 3V3 and 5V on the schematics but the connections to the BCM and/or regulators are not in their documents. It appears the 5V node is coming from the raw USB/external ...
0
votes
2answers
438 views

Raspberry pi 12v relay

I have bought this relay: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F262722739443 In the '1 channel 12v relay' variety I am going to be using it to power ...
1
vote
0answers
52 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 ...
3
votes
1answer
6k views

Cut GPIO power on shutdown

I'm developing a project where I have a button connected to the Raspberry Pi GPIO where it sends shutdown command when pressed for 3 seconds. I also have a 16x2 LCD that outputs status messages. When ...
1
vote
2answers
2k 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 ...
3
votes
1answer
120 views

Unknown fuse blow out in custom power board for raspi B cluster

I've been trying to adapt the design for power distribution layed out in this raspi cluster design. . While looking through the researcher's design, I couldn't find any use for jumpers 2 and 3, ...
1
vote
2answers
949 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 ...
2
votes
2answers
117 views

Powering a RPI with its circuit from one wallsocket

I want to power a Raspberry Pi with 54 LEDs (24 white, 24 warm white, 6 RGB - probably all at 20mA or something like that) from one wall socket. I'm planning to use the Pi to control the LEDs via ...
10
votes
3answers
9k views

Creating halt/wake button?

I have rigged up a wake-from-halt button using pins 5 and 6. These two pins, when connected, will reset power and reboot from halt. I want to use this same button, if I can, to run a command that, ...
3
votes
2answers
7k views

Controlling 240 volt power supply (via Relay) with Raspberry Pi

I love my little raspberry pi, and I am reviving an old home automation project, but instead of transmitting (in the old project, a butchered remote control) a signal at 433MHz (described here) to ...