Questions tagged [voltage]

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41 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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1answer
47 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 ...
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1answer
30 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 ...
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0answers
20 views

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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0answers
40 views

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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2answers
86 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 ...
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2answers
150 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 ...
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2answers
284 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 ...
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1answer
46 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 ...
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1answer
44 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 ...
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2answers
128 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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0answers
123 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 (...
3
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4answers
410 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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0answers
14 views

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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3answers
30 views

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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0answers
53 views

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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0answers
23 views

Calculating a time-varying voltage output that simulates a modulated carrier wave

So I have this measurement instrument and I want to transmit its data (database files from MySQL) at low frequencies (80-100kHz) through a limestone cave ceiling to the surface. Disregarding the ...
0
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1answer
57 views

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 ...
1
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1answer
441 views

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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1answer
39 views

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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0answers
81 views

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 /...
0
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3answers
804 views

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 ...
0
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1answer
230 views

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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2answers
56 views

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. ...
1
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1answer
35 views

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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0answers
45 views

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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2answers
107 views

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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0answers
28 views

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 ...
4
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4answers
1k 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 ...
1
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1answer
101 views

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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2answers
401 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 ...
1
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3answers
96 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 ...
1
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1answer
254 views

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 ...
2
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1answer
461 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 ...
0
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1answer
352 views

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 ...
0
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2answers
1k 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 ...
2
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1answer
59 views

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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0answers
52 views

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 ...
1
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1answer
170 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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0answers
33 views

Can GPIO pin of Raspberry pi tolerate voltage above 3.3V? [duplicate]

I am using an inductive proximity sensor having an operating voltage of 5V with raspberry pi 3B+. Sensor has been given 5V from Pi. On sensing metal, output of this sensor is approximately 4.5-5Volts. ...
1
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0answers
89 views

RPi 4B official power source not powering it ON

I am trying to get my RPi4B(4GB) powered ON with a power supply but am frustrated with the results. I found a workaround to this problem, which is that I can power on the Pi4B with a type-C USB cable ...
2
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1answer
62 views

Use Raspberry with two devices that require 3.3v pin

I'm planning a project with an RFID reader that connects to the GPIO pins on a RPi2 and will use the 3.3v pin. Additionally I wanted to add an active buzzer, which also would require an 3.3v pin. Is ...
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0answers
66 views

Need a constant power supply for raspberry pi

I'm using a raspberry pi which is connected to a gps. What we do is we plug the raspberry pi to a truck with a car charger so we can track it. But the problem we are facing is that the truck moves ...
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0answers
142 views

Is it fine to power a buzzer that requires only 3V using the 3V3 pin of the Raspberry Pi 3 B+

I have a solid state relay but I think I don't need it anymore.
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0answers
113 views

SIM800C GSM Module with USB to TTL Serial CH340 Module

I'm planning to use this instead of connecting the pins of the GSM module to the pins of the RPi3B. Since the voltage for the TxD and RxD pins of the SIM800C is 5V and the TxD and RxD pins of the ...
0
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1answer
59 views

GPIO pins lose voltage when connected

I am still a beginner in raspberry pi world. I have a 3 B+ and a small water pump that can work with 3V to 12V, and a multimeter that I use to measure voltage. First when I measure voltage between ...
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1answer
40 views

Newbie: Raspberry Pi Games Emulator 12v Power supply - Car

I have Corsa D 2007 (wife's old car). I've recently stuck one of the cheap eBay Android Touch screens into it for the laugh (came with reversing camera!) - side note for £30 I'm pleasantly surprised ...
1
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3answers
1k views

How can Rpi GPIO read the 12V output signal from a Guardline Security Alarm?

My new Guardline Security Alarm can send a 12-volt output signal to an accessory device. I would like to send that signal to my Raspberry pi and have it send an email to my iPhone. I bought a SMAKN Dc/...
1
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1answer
45 views

PowerBoost 1000 5V with a 3.7v LiIon/LiPoly battery

I am very new to electronical components, and I am not sure if I can do the following: I am planning to start a project where a RPi Zero W would record 720p and/or 1080p videos (60fps ideally, else ...
3
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3answers
2k views

What is the correct (internal) voltage range for a RPi 4?

When running vcgencmd measure_volts on older RPi's, a normal reading is 1.2v However, on my new RPi 4, the voltage reading is: 0.8648v Does this indicate a power issue, or is this normal, and the ...