Questions tagged [voltage]

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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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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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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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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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Help to identify a chip on the RPi 4 modeel B

I am trying to identify a chip on the RPi 4 model B that is connected to the SD card. The chip is located next to the SD card reader and one of the pins is connected to the SD Card positive voltage ...
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2 answers
369 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?
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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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2 answers
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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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2 votes
1 answer
90 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 ...
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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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Change DVFS scale on raspberry pi in real time from the CLI?

I am creating an app that will showcase the power efficiency of the raspberry pi with different DVFS scaling. I am wondering whether there is an option to change the settings from the CLI, since that ...
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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 answers
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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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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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1 answer
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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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2 votes
2 answers
277 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, ...
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1 vote
0 answers
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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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2 votes
4 answers
1k 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 ...
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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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3 answers
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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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1 answer
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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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1 answer
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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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3 answers
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Low voltage on raspberry pi?

I have an old charger from my RP3 using in RP4 with micro-usb -> usb-C cap on it. I have a feeling that my Pi has not enough power- When I start Pi with fan connected to pins, it makes sounds like ...
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Monitor the power consumption in real-time (in Ampere or Watt)

I'd like to monitor in real-time the power consumption of a RPi. (0.5A, 1A, 2A, etc.) I know this can be done with a multimeter in ammeter mode in series, but I thought maybe there is an easier method,...
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2 answers
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How can detect a very low voltage (0.2 V) with the Raspberry Pi? [closed]

I'm a beginner in electronic and I want to use a GPIO input to detect 200 mV. Is that possible ? I think that we can increase the voltage, decreasing the amperage. But I don't found a way to do it. ...
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1 answer
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Programatically Establishing When RPi Supply Voltage is Too Low

Responses to this post: How does RPi "know" when it hasn't got enough power indicate that there is a digital input somewhere on the RPi which indicates what the supply voltage has ...
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Is the low voltage danger only during boot or during operation too?

I went to an authorized reseller, but they gave me this charger for my Raspberry Pi 3B. I used Etcher to write the August 2020 version of RPi OS to the SD card and it boots fine. However, during boot ...
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2 answers
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GPIO 3.3 V signal still readable after inputting high resistance values

I recently obtained a raspberry pi 4 (8GB) and I am trying to understand the GPIO behavior and ran into an event that I don't understand. I have set-up a simple script that allows pin 36 (GPIO 16) to ...
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Smartmirror: i2cdetect and voltage

I build my first smartmirror and I have two issues. First of all this is my setup: RASPBERRY PI 3 Model B LG-Philips LP173WF1 (TL)(B2) 17,3" LED Display Screen (non-glossy) Full HD Hdmi ...
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4 votes
4 answers
2k views

Voltage monitoring of battery pack (i.e. before voltage regulation)

I am looking to use four 18650 batteries and a step-down DC-DC converter to power my Raspberry Pi 4. The negative terminal of the DC-DC converter is common for the input and the output. I would like a ...
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1 answer
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Can Rpi GPIO pins be used to drive a DC motor? [closed]

I tried to GPIO pin to high and I cannot see output voltage. I try every solution but no one works for me. import RPi.GPIO as g g.setmode(g.BOARD) g.setup(16, g.OUT) g.output(16, g.HIGH) I look GPIO ...
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1 vote
2 answers
505 views

can undervoltage damage Pi 3?

I was running a Pi 3b model from an "insecure" power source, aka unknown car radio USB, no idea how many amps it gives. but the lightning symbol appeared on the HDMI screen, then the screen flicked a ...
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1 vote
3 answers
204 views

Best voltage for a Raspberry Pi 3B

I have 5.0V 3A and 5.2V 3A regulated supplies that I can repurpose for my Raspberry Pi 3B project. Am thinking of using the USB power jack. Which should I go with? 5.2V would seem to be within the ...
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1 answer
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Issue with a 12v switch via GPIO output

I am a beginner when it comes to electronics so I would appreciate your help with a simple project I am working on and have been struggling with for several days. The idea is that I have a PIR Sensor ...
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2 votes
1 answer
596 views

How can Rpi I2C read a Coulomb Counter, up to 18V, 10A?

I"m building an autonomous boat with a solar panel. The heart of the boat is a Raspi zero which contains a small program doing the navigation. I've got a 3S li-ion battery of which I'm already ...
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GPIO Output Pin Reverse Current/Higher Voltage

I have a device with a built in voltage divider and opto-isolator. I need to send a pulse to from the RPi GPIO output to the input pin in the circuit. The output from the optic-isolator goes to an ...
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2 answers
2k views

How to add Capacitors to Raspberry Pi

My goal is to add capacitors to the Raspberry Pi power-supply. Currently I have my raspberry Pi plugged straight into a portable 5v battery, this works fine. However, I want to be able to swap from ...
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2 votes
1 answer
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Cannot detect interrupt properly on a pulled up line

This is my simple setup simulate this circuit – Schematic created using CircuitLab This is my test program, using nodejs and rpi-gpio. var gpio = require('rpi-gpio'); gpio.on('change', ...
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0 answers
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Raspberry Pi has no GPIO Output

my raspberry pi 3B+ hast the latest Buster Update(Installed 23.03.2020). When I measure the GPIO output I get with at the 5V pin around 0.025V of output and at the 3V pin the multimeter says 0V. I ...
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1 vote
1 answer
245 views

powering a sensor usin external power

I' m not electronic or electricity specialist , i'm a developer who tries to make fun stuff on raspberry pi , and this is why i burned two rpi 3 . i'm using my rpi with many electronic stuff , pir ...
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