Questions tagged [voltage]
The voltage tag has no usage guidance.
145
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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 ...
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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 ...
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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 ...
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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 ...
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51
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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 ...
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3
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177
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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 ...
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118
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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 ...
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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 ...
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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.
...
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387
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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?
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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 ...
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212
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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 ...
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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-...
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120
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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 ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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237
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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 ...
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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,...
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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 ...
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114
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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 ...
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121
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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, ...
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129
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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 ...
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2
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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?
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369
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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-...
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Which is better to measure voltage and current,INA219 or current/voltage sensors? [closed]
Im doing a DIY battery and after that I want to measure the results and displaying the results in Raspberry Pi.
I wanted to know if the measurement could be better done using INA219 or voltage/current ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Retropie Battery Powered Handheld
I am planning to build a Retropie Handheld and want to use:
2 of these in series: https://www.jaycar.com.au/14500-rechargeable-li-ion-battery-800mah-3-7v-nipple/p/SB2300
paired with one of these: ...
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2
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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 ...
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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 ...
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781
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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 ...
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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 ...
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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 ...
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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, ...
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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 (...
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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 ...
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Driving 6 electric channels on/off and voltage (48A / 30-41V) from pi
I would like from a pi, to drive a current of 48A and regulate voltage between 30-41V (1440-1968W !). Furthermore, this current will be split into 6 input, and I would like to be able to switch on/off ...
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Avoiding voltage drops when simultaneously using multiple DRV8833 motor drivers
I am using three DRV8833 motor drivers. The power supply is currently a usb cable with the ground and power connected to a breadboard with the three motor drivers attached to them. When powering all ...
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Raspberry Pi 4 Undervoltage warning even with official AC adapter
My Pi 4 is relatively new and I previously used a 5V 3A tablet charger from an old Huawei device to power it without issue.
Recently, a lightning bolt started appearing at the top right of the screen,...
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Connecting Differential pressure sensor MPXV7002DP to Raspberry Pi 4
MPXV7002DP is analog sensor which measures differential pressure and requires 5V supply voltage and gives an output voltage of 4.5V. However, I want to get the digital output so I will connect the ...
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Raspberry Pi 4 - Booting with 3 USB attached Harddrives causes Crashing
I use my Raspberry mainly as a fileserver. I've attached 3 harddrives, 1 of them being an SDD and 2 Mechanical 3.5 Drives. When powered on, everything seems to work. However, when booting, the initial ...
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Dim when not configuring any GPIO pins; why?
I am an absolute beginner with the Raspberry pi and also know only basic electronics, so please excuse me if this is a very basic question.
I wired my Raspberry pi 4 like this to control an RGB LED.
...
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Change the CPU Core Voltage from terminal
I was wondering if anyone is aware of how I can change the CPU Core Voltage of a Raspberry Pi using system calls from the terminal. I know that we can do this by setting the over_voltage parameter in /...
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