Questions tagged [voltage]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
1answer
35 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', ...
1
vote
0answers
29 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
vote
1answer
39 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 ...
0
votes
0answers
25 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
vote
0answers
57 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
votes
1answer
37 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 ...
0
votes
0answers
46 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 ...
0
votes
0answers
24 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.
0
votes
0answers
32 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
votes
0answers
18 views

Multiple 5v Sensors on Pi4 [duplicate]

I'm just hoping to confirm before I blow up my new Pi4: I have three 5v sensors which I am already committed to for my automotive project. I have already set them up for use with Arduino and ...
0
votes
1answer
42 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 ...
-1
votes
1answer
25 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
vote
3answers
91 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
vote
1answer
26 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 ...
2
votes
3answers
150 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 ...
0
votes
0answers
54 views

I'm new to this…upgrading a Arcade1up Rampage machine to Raspberry Pi

You guys will probably laugh at me for asking dumb questions...but...here's my issue. Any help would be forever appreciated! I followed the instructions perfectly from a YouTube video by ETA prime....
0
votes
1answer
100 views

Raspberry Pi 4 Low Voltage performance

I am looking what exactly happens when a Raspberry Pi 4 is powered with low voltage. I am not looking whether this will hurt the Raspberry (as this has been asked before) or how to fix this. I ...
-2
votes
2answers
46 views

Is L293DNE Dual H-Bridge Motor Driver Chip/Board also a 5V voltage regulator/converter to power the Raspberry Pi itself?

Have been reading many articles showing how to connect DC motors to the Raspberry Pi and of course a DC Motor Driver Chip/Board is needed to come between DC motors and the Raspberry Pi GPIO Pins to be ...
1
vote
1answer
88 views

AC Current sensing giving low readings (SCT013)

So now that I feel comfortable with using ADCs, I am attempting to measure the AC current with the SCT013 clamp with AC current sensor. Setup: I clamp the SCT013 around the HOT wire of a table lamp ...
1
vote
2answers
91 views

Slight dip on the GPIO 5v line when LEDs are on

I have my raspberry pi set up to do two main things: control 16 LEDs via 16 transistors each connected to an out pin. The LEDs are collectively fed the 5V from the GPIO. power a chip also on the 5V ...
0
votes
0answers
123 views

Clamp on DC Ammeter with Raspberry Pi to Monitor 12v Batteries

We are looking to use raspberry pis to monitor banks of 12v batteries in a real world environment. We currently are able to use a USB voltmeter from : http://www.digital-measure.com/html/...
0
votes
2answers
110 views

Voltage drop when RaspberryPi boots

Im trying to learn robotics with raspberrypi but im having a problem. I have 6 AA batteries in a batteryholder that are connected to a breadboard and with M-M jumping wires its connected to a LM2596S ...
0
votes
0answers
55 views

RaspberryPi is not provided with enough power

Im trying to learn robotics with raspberrypi but im having a problem. I have 6 AA batteries that are connected to a LM2596S adjustable voltage regulator module, Which then is connected to the ...
1
vote
2answers
47 views

do RPi3 3.3/5V pins output constant voltage even if the RPi power supply is changing voltage?

I want to power my RPi with a lithium ion battery. The RPi will be powering some devices which require constant voltage to power them. If I use a battery as supply for the RPi (which changes as it ...
2
votes
2answers
266 views

Convert 12V to 5V to power RaspberryPi

I have an Eleksmaker laser cutter which has a board with a 12V output (see top of image). I would like to power my RaspberryPi using this 12V output. What is the advantage of powering the ...
2
votes
2answers
616 views

What happens to the GPIO voltage after shutdown?

I don't have a Raspberry Pi laying around at the moment and I would like to detect if my Raspberry Pi is shuted down. My Idea is that maybe after the Pi shutted down the Voltage at the 3V3 pin will ...
2
votes
2answers
52 views

Measure Volt, Amps, Watt and Kwh of an external 12V system

I saw online some cheap hardware ~10$ that can measure Volt, Amps, Watt and Kwh and display the results on an LCD screen. I could buy and plug these on my 12V solar panel system to monitor it. (5 of ...
0
votes
1answer
60 views

Is there a piece of hardware which enables hotplugging sensors to the breadboard?

The idea is the following: I have a Raspberry PI connected to a breadboard. To this breadboard, I would like to connect (digital and analog) sensors and actuators while the PI is running. Or remove ...
1
vote
3answers
62 views

Voltage dropped significantly on GPIO 4 with a relay coil

I have a Raspberry PI 3 B+, and when I activate the GPIO 4 as output and checking agains a multimeter I get its 3.3V as expected. If I connect the GPIO4 to one end of a coil (http://www....
0
votes
0answers
34 views

LCD Installation freeze because of low voltage?

i try to install my LCD 3.5 waveshare, but when extracting the folder and use sudo ./LCD35-show it starts shortly and then freeze. I Got the thunder icon and the freezed screen. Might this be the ...
1
vote
3answers
248 views

GPIO to detect if external 5v source is turned on or off?

I'm using a Pi Zero W and I'd like to connect a 5v source to a GPIO pin to detect if the 5v is on or off. I know the GPIO is only digital I/O and 3.3v max, so is a simple voltage divider enough or do ...
0
votes
2answers
74 views

Is 5V out on the Pi Zero W unregulated?

I want to power a 5V relay breakout board from a Pi Zero W. I believe the 5V pads are "raw" and a "pass through" voltage? Is this correct?
0
votes
3answers
296 views

Rpi Reading MCP3008 10 bit ADC Result Problem

I want to measure some battery voltage in a range 0V-4.2V with MCP3008(VDD=VREF=3.3V). I used a voltage divider with R1=2.7MOhm and R2=8.2MOhm, but it didn't return correct value, I used resistors ...
1
vote
1answer
1k views

Seeed ADC (ADS1115) with Raspberry Pi 3 B+to read voltage values using python3

I'm using a Seeed 4-Channel 16-Bit ADC (ADS1115) for Raspberry Pi with a Stretch installed Raspberry Pi 3 B+ and successfully configured following below guidelines & GitHub. http://wiki....
4
votes
2answers
712 views

Water Level Detection Sensor 3.3 Volt vs. 5 Volt

I'm using a classic Water Level Detection Sensor or sometimes called Rain Water Level Sensor together with a RPI 3+ to detect water in a Pot (Link). So I don't need any analog reading but only the ...
4
votes
2answers
645 views

Reading Voltage Input on ADC

I'm thinking of using the Waveshare ADC board with a RaspPi 3 to monitor the current driving a DC brushless motor. I've run through the waveshare examples, and I can handle reading inputs ...
0
votes
1answer
171 views

is undervoltage on a pi3b+ a problem of the board?

Like many others I got the undervoltage warning on a pi3b+. I see most answers blame a poor power supply. I plugged mine to a bench power supply to test this, I set it to 4 amp and kept getting ...
0
votes
0answers
161 views

Control 12V motor from 3.3V GPIO with external 12V Power Supply

I have a 12V motor, which I need to control from my Raspberry Pi (through the RaspiRobot Board). However, the RaspiRobot Board gives me only 3.3V for the motor. At the same time, I have a 12V adapter ...
0
votes
0answers
105 views

Checking Voltage Level at GPIO Pin Program

I’m trying to write a program that will loop through 3 GPIO pins connected to an external charging pad and see if a device has been placed on the pad (high voltage). If high signal is detected the ...
0
votes
2answers
271 views

Turn a Raspberry Pi into a voltage tester

I would like to create a voltage tester like the one described in this video, using 555 ic, and then connect it to Raspberry Pi, in order to log the frequency a 220V waterpump is switched on. My ...
1
vote
1answer
85 views

Wiring that won't damage my pi [closed]

A while ago, I decided to wire up a Raspberry Pi (Zero W) to a few peripherals, but it stopped working shortly afterward (not entirely, but I think it was undervolting the power rails). I had ...
1
vote
1answer
53 views

Lipo Battery Voltage Drop When Pi 3B and LCD Screen Are Both Connected to Powerboost 1000

I have a Raspberry Pi 3B and LCD Controller Board connected to a Powerboost 1000 Basic. A Lipo Battery Charger is connected to the Powerboost as well. I noticed if I remove the LCD Controller board ...
0
votes
0answers
51 views

Is it possible to plug in and out sensors, LED-s etc. on the breadboard while the Raspberry is running?

What I would like to do, is to let the Raspberry Pi run and while it is running, connect and disconnect eg. sensors whenever I please to/from the breadboard WITHOUT turning off/disconnecting the Pi ...
-1
votes
1answer
71 views

Raspberry PI Portable USB Charger [duplicate]

I bought a $5 usb charger that I am using to power my Raspberry Pi. The charger works decently but I am noticing that every once in while the raspberry pi will reboot. I have read that some chargers ...
0
votes
2answers
1k views

FM transmitter antenna length

I'm a new raspi user, and I'm starting to build some projects with hardware. I would like to try this FM radio station for example, but I have a doubt about the antenna's length. This is important ...
3
votes
2answers
7k views

Get reading of RPI supply voltage

On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question. My question is whether there's a way I can access the voltage reading ...
0
votes
1answer
404 views

PWM and Output Voltages at High[er] Frequencies

I am attempting to set an analog voltage control signal with a Rasberry Pi 3 B+. My Python 3 script uses RPi.GPIO to output PWM across a range of duty cycles to simulate analog output---without the ...
0
votes
2answers
242 views

How to increase voltage of USB ports on the Raspberry Pi 3 Model B?

I have been trying to build a Raspberry Pi laptop, and I found an issue where my screen required power at all times to run , so I decided to plug the screen in to the USB port in the Raspberry Pi. ...
1
vote
2answers
58 views

Ground running back through logic shifter?

Sorry if this is a silly 'beginner' question, but I'm still only just getting into working with the Pi. I have a Pi Zero that I want to use to drive a module of a few WS2812 LEDs. Because the GPIO ...
0
votes
1answer
583 views

Pi 2B, Under-voltage detected!, no lightening bolt, +5 is rock solid at 5.01VDC

This is a weird one - have had 2B in service for three years, but it crashed last week. Rebuilt with a new Pi 2B+, but saw undervolt errors on the rebuilt system that would have gone unnoticed, so ...