Questions tagged [voltage]

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How to power a Raspberry Pi 4 through usb c or gpio pins?

Hello everyone I am running into some kind of problem. I want to power my Pi 4B+ through the GPIO pins via a buck converter but it just wont work. I used the LM2596 non adj 5V buck. In its typical ...
Luuk Benningshof's user avatar
-1 votes
1 answer
75 views

Connecting 12V doorbell signal to GPIO input

I'm trying to connect the signal from a doorbell to a Raspberry Pi Zero 2W to modernize the existing system with IoT capabilities. I did some measurements and I found that the terminal that powers the ...
SierraJuliettMike's user avatar
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1 answer
37 views

Trying to understand the under voltage issue

Using this script to provide a power report, I am getting the following while powering the Pi with iPhone power brick and the official Raspberry Power supply brick: -- using official Raspberry Pi ...
AngryHacker's user avatar
1 vote
2 answers
110 views

Pico W common reference ground with 5V power supply safe?

I have a question regarding a new project I’m currently working on. It involves a Raspberry Pico W, an external 5V 12A power supply and a WS2812B LED strip. Now, I already got it working flawlessly ...
Seatropicalnet's user avatar
0 votes
1 answer
44 views

Toggle 240v motor load with raspberry pi

I am working on a project where I would like to power on and off a 240v industrial fan with the raspberry pi. Basically the idea is to tap into the 240v line and add a relay that the pi can control ...
Logan Holmes's user avatar
1 vote
1 answer
58 views

Connecting an analog level sensor

First time poster here. I'm okay with the programming side but have some issue with the electronics side I have raspberry pi 4 and wish to connect a submersible water level sensor to it. The sensor ...
ancalleja's user avatar
0 votes
1 answer
126 views

My RPi5 USB ports voltage drop significantly below 5V

I have a USB voltage/current monitoring dongle plugged into my RPi5 USB port. I am running a USB-PD supply. When I plug in a relatively new USB hard drive the USB port voltage drops into the 3V range ...
Joe Malek's user avatar
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1 answer
123 views

Using Raspberry Pi to control light dimmer switch

In my house I have my lights hooked up to an ELKO 400GLI. I've not found good spec sheets for it online, but what it seems to do is control the brightness of the lights using a copper coil. What I ...
SirAchesis's user avatar
-1 votes
2 answers
70 views

Can a gpio pin be read as an input without voltage going through? [duplicate]

I have pi 3 and I want to use one of the pin as an input. It will be connected to tapped off wires from a switch that has 2 volts going through it when it is closed. So I want to feed this 2 volts as ...
ThN's user avatar
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2 answers
43 views

Where to find LED values of the Raspberry Pi Pico MicroPython Learning Kit?

I am getting started with a pico and I got the Raspberry Pi Pico MicroPython Learning Kit from waveshare (https://thepihut.com/products/raspberry-pi-pico-micropython-learning-kit-pico-included) It ...
Another_coder's user avatar
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2 answers
65 views

Raspberry Pi 4B giving 0.3V output when GPIO is set to True or High

I have a Raspberry Pi 4B, 4GB version. When I try to run the following code it gives 0.3V output. I mean it works, on-0.3V, off-0V. But I need 3.3V output. I measured it with a voltmeter, as the ...
Aaron Crt's user avatar
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1 answer
36 views

Connecting 15/21V to GPIO to read an on/off state

I am working with GPIO where I want to read a vacuum sensor's output voltage. Using a voltmeter from the output to the pi's ground, I measured the voltages. ON State: 21V OFF State: 15V I know that ...
Danny's user avatar
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0 votes
0 answers
96 views

8-relay board wiring to Rpi using GPIO

As small question about a relay board. I have a couple of those cheap aliexpress relay boards I need to use in a project. I looked for hours online in various tutorials, but I cannot seem to find a ...
Tim's user avatar
  • 13
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3 answers
764 views

Raspberry Pi 3+ "brownouts" and under voltage issue with good power supplies

My raspberry pi 3+ is showing undervoltage warning. I know this is a common issue and I've done a fair bit of trouble shooting, so please keep reading. At first, I tried powering my raspberry pi with ...
mahela007's user avatar
  • 103
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2 answers
391 views

Low power warning when using pi with touchscreen

I’m using a raspberry pi 3B with this DSI touch screen from waveshare. As a power source I’m using this battery hat, which according to the documents should provide 5V. The battery is also fully ...
Alexander Hörl's user avatar
1 vote
2 answers
124 views

set new Low value threshold GPIO

This can of course be done by using a resistor and in that way changing the actual voltage for the GPIO digital input pins on the RPi. But is it possible to set/change the actual threshhold on the RPi ...
acroscene's user avatar
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How to set GPIO pin that requires 5v HIGH with 3v input?

I have a circuit block (Let's name it as block A) with a set of GPIO pins. The HIGH state of these GPIOs are 3v. I have a motor bridge that requires 5v input to set its (motor bridge's) GPIO to HIGH. ...
Mad's user avatar
  • 101
2 votes
1 answer
419 views

RPi 4: What happens when reverse voltage is supplied to the GPIO header?

Does the RPi 4 have any kind of protection against reverse voltage when the GPIO header is used?
Tintenfisch's user avatar
2 votes
2 answers
181 views

Is it possible (and wise) to use RPi Pico W to control an atomiser which has 5V operating voltage?

I’m working on a project which uses Grove Water Atomiser which has 5V operating voltage. I’ve used it with Arduino nano and it has 3 pins: Vcc (5V), Gnd and a control pin which receives the signal ...
Ivan Novikov's user avatar
3 votes
1 answer
403 views

Does Raspberri Pi recover from throttling?

I have a Raspberry Pi (3B+) in a setup, where during boot process may a small undervoltage occur (under certain conditions). However, I found out, that it never leaves the "throttled" state ...
Jan Koupil's user avatar
1 vote
0 answers
494 views

rpi_firmware_get_throttled: X callbacks suppressed

I have the following entry in my logs: Oct 08 17:51:02 rpi-dash kernel: rpi_firmware_get_throttled: 9 callbacks suppressed It is suspiciously surrounded by warnings about power: Oct 08 17:48:07 rpi-...
WoJ's user avatar
  • 545
0 votes
1 answer
192 views

Voltage divider for multiple gpio inputs

I have a system that can output 12V depending on measured events. The way the 12V of the system are provided is via a 12V output that gets shorted to GND via a transistor output. I wanted to use these ...
Dahlin's user avatar
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0 votes
1 answer
110 views

Sensing if DC motor is on

Im trying to sense if a 12V dc motor is switched on. A hi low reading for the voltage on the gpio would be fine. My thought was to use a voltage divider to get a low voltage of about 3 volt to the ...
markus902's user avatar
-3 votes
1 answer
112 views

What is a voltage divider? [closed]

I bought two switch relays, and connected them up to my Raspberry Pi. I can turn any device on and off, at my will! How, this person online has a more complicated schematics: https://www.circuitbasics....
Merc's user avatar
  • 145
1 vote
3 answers
405 views

What options exist to manipulate voltage using a Raspberry Pi, above 5v?

I have a model train set which runs on 0-12v based on the position of a rotary encoder. I would like to have somewhat granular, digital control over the voltage on the track. So far, I'd implemented ...
XtrmJosh's user avatar
  • 111
2 votes
1 answer
163 views

GPIO only outputs 1.8V when using Bluedot

I have setup a basic circuit to control a relay using a Raspberry Pi 4B. I have tried controlling it with both a push button and the Bluedot app. When implementing with the push button, the GPIO pins ...
Nathan De Meyer's user avatar
0 votes
2 answers
1k views

Where is the configuration setting for enabling and disabling low voltage warnings in Bullseye 64 bit?

I'd like to know where the configuration settings are set for the Bullseye 64 bit Raspberry Pi OS to enable or disable low voltage warnings, for both the terminal and the LXDE desktop environment. It ...
BlandCorporation's user avatar
-1 votes
1 answer
486 views

Insufficient power for RPI + 7" Touch Screen

I have a raspberry pi 3B. It is connected to a 7" RPI Touch screen, (made by RPI). The screen gets 5v from the pi and the pi is connected to a 5v, 2.1A USB power pack. For some reason the power ...
X Builder's user avatar
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0 votes
1 answer
1k views

Strange voltage on 3.3V pins

I have bought a new Raspberry Pi 4 and while troubleshooting connection to a DAC module I measured the voltage at 3.3V power pins. With reference to the pin header number as shown on the diagram below,...
Zaffresky's user avatar
0 votes
1 answer
345 views

can I use a 12v car battery to connect to a L298N h-bridge to control two 12v dc motor [closed]

I am new to the raspberry pi world and electronic in general. so I am wondering if it is safe to hook up 20 AWG wires to a car battery and have those wires going into a L298N h-bridge to power 2 ...
Rick's user avatar
  • 11
0 votes
3 answers
163 views

Any danger to supplying multiple GPIO with small voltages

Very new to GPIO and wiring circuits so I'm hoping someone can clarify whether what I'm doing is going to be safe for the Pi. In my original question I was looking for the way to get my 12V supply ...
dbmitch's user avatar
  • 381
0 votes
1 answer
137 views

Regular Voltage Spikes on Raspberry Pi

[Running Raspian v10, Buster] I'm using a raspberry pi zero with a waveshore ADS1256 high precision board. I'm getting regular voltage spikes 30 seconds regardless of the input. I've disabled wifi, ...
MC_Sam's user avatar
  • 11
1 vote
1 answer
162 views

Increase GPIO Voltage

I need to dock the 12V relay when giving the command via software, however, the GPIO provides only 3.3V not being enough to arm the relay. My idea is to use a voltage booster (Step-up Mt3608) to raise ...
lukkasremondi's user avatar
0 votes
2 answers
2k views

Can I power a Raspberry Pi 400 with a 5V 2.5A power supply?

I have Raspberry Pi 3 B+,and I'm considering upgrading to a Raspberry Pi 400. I understand that it is recommended to use a 5.1V 3A power supply, but can I use the 5V 2.5A supply I already have?
Robert's user avatar
  • 1
0 votes
1 answer
525 views

5V proximity sensor to Rpi zero W GPIO

I want to use an NPN inductive proximity sensor with Raspberry pi zero w. The link to the sensor I am using is this: https://robu.in/product/orange-15mm-npn-inductive-proximity-sensor-rm30-dc636v-...
IOT-Guy's user avatar
  • 31
0 votes
2 answers
555 views

Which is better to measure voltage and current,INA219 or current/voltage sensors? [closed]

I wanted to know if the measurement could be better, more accurate using INA219 or voltage/current sensors connected with ADCs? Also considering the time to implement both systems, which would give me ...
Harli Lacej's user avatar
0 votes
2 answers
161 views

Undervoltage warning with original powersupply

I am running into the issue of getting the undervoltage detection on my Pi 3 B V1.2 while it is connected to an original psu (which provides 5.1V/2.5A). The psu definetly works as intended (I tested ...
cromlegionar's user avatar
0 votes
2 answers
2k views

Low Voltage Warning with Anker Power Supply [duplicate]

I have an Anker Atom 3 4-port power supply (https://us.anker.com/products/a2045). In the USB-C port, I've got a USB-C ub plugged in that goes to my chromecast w/ Google TV as well as a web cam for a ...
Evan M.'s user avatar
  • 113
1 vote
1 answer
208 views

Raspberry PI GPIO protection

I'm designing a PCB to mount and interact with a raspberry pi4. One of the things I need it to do is drive a 24V relay. This circuit has worked great with some controllers I've used where the outputs ...
BBridges's user avatar
2 votes
1 answer
344 views

raspberry pi prevent overload current from turning on a high current motor

I am trying to use only 1 power supply instead of 2 to power Raspberry Pi and motor, but when I turn on the high current (>10A) motor, it will lead to the Raspberry Pi restarting. I guess it is ...
Pak Ho Cheung's user avatar
0 votes
1 answer
74 views

12V Switch advice

I’m new to RPI and have a project. Please take a look at the fire switch on the diagram. I would like to add a RPI on that loop and see when the fire button is depressed. This is a 12V system so any ...
Seán Gahan's user avatar
0 votes
1 answer
360 views

When To Use a Level Shifter (Arduino Uno + Pi SPI)

I was following this guide from Adafruit to flash an Arduino with a Pi using AVR-Dude over SPI: https://learn.adafruit.com/program-an-avr-or-arduino-using-raspberry-pi-gpio-pins?view=all I noticed ...
AustinFoss's user avatar
0 votes
2 answers
540 views

16 Channel Sainsmart relay board connected to raspberry pi zero w, hydrosys4 app not stopping relay / turning off relay

Within the Hydrosys4 app Settings page in the actuators test section I can set the app to pulse the GPIO and I get the LED indicator on the relay board and the relay engagement but the relay does not ...
D A's user avatar
  • 61
0 votes
2 answers
2k views

Is there a workaround to make the Raspberry Pi 4 output 1.8 V?

I have a Raspberry Pi 4 Model B and I want to use it to flash a Coreboot BIOS image to a SPI EEPROM chip (using either flashrom or a program called "spi flash programmer" that is originally ...
ema's user avatar
  • 101
0 votes
2 answers
933 views

How dangerous is to input 4.1V to the GPIO?

I'd like to power a few sensors I'm adding to my RPi (Zero W) using a battery with maximal voltage 4.1V (coincidentally, the same battery used to power the RPi, except that there's a voltage amplifier ...
Captain Trojan's user avatar
0 votes
1 answer
376 views

Raspberry pi voltage between PP3 - PP27 is 0.01V is this normal?

I measured voltage using a multimeter between PP3-PP27 and it was fluctuating between 0.01V to 0.06V is this normal? The entire problem can be found here: USB ports recieving power but not working on ...
Kiran's user avatar
  • 29
0 votes
1 answer
1k views

Can i power my Raspberry pi 3 b+ with a micro-USB to USB thats connected to a USB charger?

I read in the manual, that u should charge it with 5V and 2.5 amp, but im not sure. I already read, that a undervoltage can damage the pi and that USB 3.x would be enough, but I still dont know how ...
brainoutear's user avatar
2 votes
2 answers
757 views

raspberry pi fan don't start to spin without hand help!

Raspberry Pi has recently added fan control feature in its raspi-config tool. This made me curious to add a fan to my RPI 4. I did it recently with a 680-ohm resistor, 2N2222 transistor, 1N4007 diode, ...
AmirHo3inF's user avatar
3 votes
2 answers
902 views

RPi4 won't power on from 5V if any load is present on 3V3

The short version: Raspberry Pi 4B, rev 1.1, doesn't turn on when provided with 5V on the pins 2&4 if any load is present on the 3V3 (pins 1&17). However, powering the Pi from a USB-C source (...
MJBogusz's user avatar
4 votes
4 answers
6k views

Low voltage warning despite using official power supply tested at 5.2V

I bought the Official power supply but when I use it in my Pi 3 model B I get a warning saying: "low voltage, please check power supply". I have checked the voltage on the Pi using a ...
Cai's user avatar
  • 49