Linked Questions

2 votes
3 answers
7k views

Cannot find device can0 with MCP25625

I have been developing an expansion board for my RPi Zero, which contains a power supply based on the buck converter TPS62130 (5V/3A) by Texas Instruments, a USB Hub and a CAN Controller/Transceiver ...
eduardoSP's user avatar
1 vote
4 answers
4k views

Using single 5V relay module (jqc-3ff-s-z) - Asking for help

I have a developer background missing the electronics background. I read some threads with great interest: Using single 5V relay (jqc-3ff-s-z) - safety advice required and 5V relay (jqc-3ff-s-z) I ...
GuyH's user avatar
  • 21
2 votes
1 answer
5k views

Can I use my S7 edge charger for my Raspberry Pi 3 Model B?

I have no charger atm and I am a bit strict on money right now. Anyways, I have a spare Samsung charger and it has 2 values. 9V = 1.67A 5V = 2A It's a fast charger so I don't know what applies to ...
Clark's user avatar
  • 33
2 votes
2 answers
7k views

Is a red LED turn off during boot of RPi 3 a sign of problems?

I don't have much experience with Raspberry Pi. However, I've just noticed a difference in booting between Raspberry Pi 2 and 3, and so I've taken a couple of videos to show that. In both videos, the ...
user59894's user avatar
1 vote
2 answers
6k views

Can the 5V and 3.3V power pins be used to power multiple devices?

I am building a device that will be controlled by several digital encoders, all which are hooked up to the device's Raspberry Pi 3 model B. I know this may be a trivial question but bear with me as I ...
wlegra2's user avatar
  • 23
3 votes
3 answers
4k views

Low power warning using touch screen

I have a RPi 3 and a 7" touch screen, powered by a MW GS18E05 adapter. It says output 5-6V, 3.0-2.5A, max 15W. The top right corner yellow flash low power warning shows up when I boot and then it ...
Tomas By's user avatar
  • 218
0 votes
3 answers
6k views

Using a quickcharge power brick to run a Pi 3

I usually use my phone power brick (rated at 5v 2.5Amps) to run my Pi 3 and it works fine for the most part. Now I bought a new phone which supports something called fast charge. So the power brick ...
YaddyVirus's user avatar
1 vote
1 answer
5k views

Can I power a RPi 4 model B via a 5V/2A fast charging adapter?

It says 5V/3A in technical specs, I wonder if that 3 A is a must, or is there anybody who can power RPi 4 model B via a standard 5V / 2A smart phone adapter. Specifically, I would love to hear ...
muyustan's user avatar
  • 113
0 votes
1 answer
5k views

Best way to power Raspberry PI 3 via GPIO

I need to made device controlled with 3 Raspberry PI connected in cluster and want to made power supply via GPIO. Do I need made 3V3 and 5V supply or just 5V on GPIO2? Thanks.
Ivijan Stefan Stipić's user avatar
1 vote
1 answer
6k views

5V LED Strip Wiring Help for Raspberry Pi 3

I have a 5V LED strip that used to be behind a TV powered by its USB port - but it got mangled by the dog - and I can definitely use the scraps for a raspberry pi project. I have done my research ...
soulshined's user avatar
1 vote
2 answers
2k views

How to turn off relay when RPi shuts down

I have connected a relay to BCM 14 and by setting its output to HIGH I can turn it on, making a 220V bulb to turn on. I use for that the following python instructions: GPIO.setmode(GPIO.BCM) GPIO....
Ionică Bizău's user avatar
1 vote
1 answer
3k views

No effect when I set 'max_usb_current' in /boot/config.txt on a Raspberry Pi 3

I want recharge my iPhone from my Pi 3 Model B's USB port. In /boot/config.txt, I have set max_usb_current=1 This does not seem to have an effect any more. Why is this?
乐森林's user avatar
3 votes
3 answers
1k views

Can MAX98306 Stereo 3.7W Audio Amplifier be powered by Raspberry PI 5V supply?

Can I power the MAX98306 Stereo 3.7W Audio Amplifier off of my Raspberry Pi 3's 5V pin? I have a project that needs to be battery powered, and I'd like to run everything from a single battery and not ...
Alex's user avatar
  • 129
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) ...
TheoryX's user avatar
  • 53
3 votes
2 answers
2k 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 ...
Audrius Gailius's user avatar

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