Questions tagged [electronics]
Use this tag for questions related to how to use control electronics from the Raspberry Pi, and how to control the Raspberry Pi from electronics.
264
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Many piezo crystals driven by Pi? [closed]
I'm considering starting a new RPI project that will end up being a haptic feedback suit for video games. My thought process so far is that I can embed a lot of piezo crystals inside a vest / jacket ...
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16
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How Can I Expand The GPIO / Pin Quantity When A PiSound is Installed on the RPI4?
I'm working on creating a musical synthesizer and the sound engine requires a Raspberry Pi 4 + PiSound. From what I can gather, the PiSound is placed right on top of the RPI4 and uses its GPIO pins.
...
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1
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31
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Using a signal intended for piezo as GPIO button-like input
I'm pretty new to raspberry pi, and have fairly entry-level circuitry knowledge. For this project, I'm using a raspberry pi zero w. I'm putting this question in this stack exchange because I'm hoping ...
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1
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31
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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 ...
- 1
0
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1
answer
87
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Why does this Pico circuit use so many resistors?
I've just started working through the Freenove ultimate starter kit for the Pi Pico, and I'm having trouble understanding why it has so many resistors in this circuit.
I'm following the tutorial ...
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35
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I think I've shorted my Raspberry Pi using a Picoborg, but I'm not sure how? Help?
So I've been trying to work out how to control a Furby Boom (2013) from a Raspberry Pi Zero W and was working on connecting the Furby's DC motor to the Pi through a Picoborg. I then ran one of the ...
0
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37
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HC-SR04 Ultrasonic Sensor Heating Up and Not Working
I have two breadboards (for the front and back of a go-kart) which are supplied by the 5V power pins of the raspberry pi 4 respectively (pins 2 and 4). However, when both are plugged in, the second ...
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1
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41
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What sort of order of magnitude in time does it take from code like GPIO.output(led_pin, GPIO.LOW) to be executed to led being lighted up?
So I am lighting up an through hole led using 5V and an GPIO pin. I have code in python and I’m trying to get a precise timestamp of when the LED lights up with something like this:
GPIO.output(...
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1
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287
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Python code cannot detect my i2c address
I would like to ask some opinions regarding i2c communications with pca9685. My i2c1(SDA=GPIO2, SCL=GPIO3) of my rpi 4b is used by my mpu6050, which I had to enable one more i2c channel of my ...
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38
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Empty Pi Hat/Bonnet
Does anyone know where to find a Pi Hat or Bonnet that is empty? By that I mean a PCB that has the connectors to solder stackable headers onto, but no connections just raw PCB? The reason I want ...
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3
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808
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LED light not turning on
I was following this tutorial on connecting an external LED to a Pico W, but I've had no luck getting it to work.
This is the code I've been using:
import machine
from machine import Pin, Timer
timer =...
0
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0
answers
39
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Use raspberry pi pics to record rpm on a wheel
I would like to use a raspberry pi pick to record the rpm of a wheel on a rc car. There will be a contact on the wheel, and a contact on the body of the car. As the wheel turns, if the two contacts ...
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1
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119
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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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1
vote
1
answer
66
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Using the microUSB Port over the 4 pin for Neo-6M GPS Module on Raspberry PI
Just a quick question, what is the difference between using the microUSB port over the 4 pins for data input for the Neo-6m gps module by ublox? or for any other sensor.
Does this affect the current/...
- 13
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34
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How to Properly Stop Electronic Speed Controller
I have a brushless electronic speed controller connected to my RaspberryPi. I have tuned it to 700 - 2000. It runs correctly, but whenever I set the speed to 700, it stops (this is supposed to happen) ...
- 13
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1
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73
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Spi wrong voltage
Obviously, my spi is not happy.
MISO and MOSI were idling around 1.5v instead of 3.3 so I added a 10k pull up, and that helped a bit, but as you can see, it's still not good. It idles around 2.8v ...
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1
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218
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Protecting PI when driving motors
I am planning on driving two 12V DC motors using the "L293D" motor driver. For that I'm using a 12V battery for the motor supply, and a RaspberryPi to generate a PWM wave to regulate the ...
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1
answer
208
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Controling high voltage servo motors with raspberry pi 4
I'm building a bipedal robot and I'm using 7,4V servo motors that can consume 3.9A of current (Feetech FT5835M) and RPi4B, how can I control these servos? I'm thinking about using Adafruit 2327 HAT ...
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1
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37
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Camera module survivability questions
I have a camera module which was working fine without the two infrared (IR) lights:
.
Today, I decided to place on the IR lights:
turned off Pi
attached the lights and rescrewed the camera on its ...
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273
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83
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What sensor can I use for detecting a metal type without the use of magnets? [closed]
I am searching for a method to detect the type of metal of something solid and small and thin. The test surface is approx 4x2 cm with a thickness of maybe a few millimeter.
I cannot use magnets in ...
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1
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1
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344
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Raspberry Pi Zero GPIO pin not detecting Input
So I am using a Raspberry Pi Zero to detect the signal from this NPN Inductive proximity sensor (its input supply range is 6 to 36V and the signal pin to output the same amount of voltage which we ...
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367
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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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850
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Micro Switch implementation in Raspberry pi
I am a beginner using a raspberry pi 1 model A+ to create a production counter that would count the material as it would hit the switch and that would be counted as 1. The issue I am having is that I ...
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146
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After shutdown/poweroff command, is it possible to damage a pi (4) by leaving the Powercable in?
So I have a Raspberry Pi 4 type C 5V 3A adapter plugged into the power extender thingy at all times.
My question is, once you type the poweroff command into the terminal and see the device turning off,...
2
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1
answer
262
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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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2
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54
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Raspberry Pi 4 GPIOs are constantly on, even after restarting and cleaning up GPIOs
So, I got a Raspberry Pi 4 Model B, and I'm trying to make a project using relay boards.
Turns out, when I turn on my Pi, one of the pins is already active and the indicator turned on partially. I ...
-1
votes
1
answer
44
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Relay provides power contineously
I have set up a Pi-Zero which controls several relay switches.
The Schematic is positioned below.
import time
import board
import busio
import digitalio
from board import *
from datetime import date
...
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71
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Audio DAC for raspberry pi with 2 outputs (build in sspeakers + TS audio out)
I'm working on a project for one of my band that runs on a raspberry pi with samplerbox. the raspberry pi is connected to a powered speaker and a midi keyboard, and I can play from a set of samples I ...
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112
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LED always on while using FET
I want to switch on/off some LEDs on a breadboard using my Raspberry PI (RPi) 4. Before connecting with my RPi, I've tried to do some experiments with using a BS270 FET in an old-fashioned "dumb&...
- 111
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42
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Raspberry PI External Case Connector
I have a DIY project with a Raspberry Pie and a few sensors. I have them working, hardwired through a breadboard. As I'm mounting them to a case I would like to have a female connector that passes the ...
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2
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352
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GPIO configured as interrupts detects noise of the engine even if isolated
Did anyone work with a Raspberry Pi in a an automotive project ?
I am working on creating a dashboard for a motorcycle and it is making me crazy!
when configuring a GPIO pin as an interrupt it ...
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2
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810
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How to detect low amp AC current with GPIO
There is switch inside a commercial gate operator that I need to monitor with my RasPi.
The switch has two ~18 AWG wires, when the switch it closed, it's 50V AC connection. When the switch is open, ...
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1
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2
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253
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L298N motor driver either keeps running or slows down the motor with RPi3
Following this video, my motors should be constantly running as per the program and should stop running after the program is executed.
When I first ran the script, the motors did run, as per the ...
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1
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328
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What is this 8-pin fpc place On RPi 4?
I was looking at my Raspberry Pi 4B and I saw something like a not soldered place for fpc connector and I got curious what is that!???
just Look under USB2 at top right corner in the image bellow.
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370
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How can Rpi connect to and read the DIY PH-4502C pH Sensor?
How can Rpi connect to and read the DIY PH-4502C pH Sensor?
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139
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Long male to male jumper wires. What is AWG/Gauge
for a certain project, I need very long male to male wires (~3 meters).
I went on amazon, and think that these might do the trick.
However, because I am very new to the electronics in general, I got ...
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310
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Is it possible to move a stepper motor to a specific angle?
For Example:
move.stepper(90°) #stepper now points to the east
time.sleep(1)
move.stepper(180°) #stepper now points to the south
time.sleep(1)
move.stepper(263°) #stepper now pointing to 263°
I ...
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2
answers
2k
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5V Relay only works if VCC is 3.3V
I am very new to all of this, so please excuse if this is a very basic question.
I am trying to power a tiny water pump with my raspberry pi. For that I need the 3.3V or 5V output, because the GPIO ...
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2
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1k
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Using Relays to Power off then Cut power to Pi Zero
I have a raspberry pi zero that I am running off a battery for remote logging reasons.
There is a low battery shut off module I have connected to the battery in case the battery gets below a certain ...
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124
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Is this RPI 3 B+ fixable, overvoltage on usb micro
I cant identify the component that blew, any help idenitying it would be appreciated. Is it possible to replace it to save this rpi?
desoldered from the pads exposed on the right of the usb micro port
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147
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Is it safe to use GPIO as GND for multiplexed 7-Segment display or should transistors be used?
I want to control a 4-digit multiplexed 7-Segment + Decimal Point Display (SH5461AS).
This diagram (which allegedly comes from the datasheet of this display) suggests to use 4 external transistors to ...
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1
answer
157
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Using a GPIO to unlock an electronic lock [closed]
I want to build a safe that can only be opened via an HTTP POST request. In order to do this the safe will contain a Raspberry Pi Zero W that will host a simple server that listens to these requests ...
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3
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465
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Use GPIO to power an USB device
I searched the forum but didn't get a clear answer.
I have a "LED tinsel" powered by an USB plug. I tried connecting a 5V pin of my RasPi3 GPIO to the "+" pin of the USB plug, and ...
2
votes
1
answer
455
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Is it possible to drive two PWM pins with opposite phase?
One well-known trick to make a piezo buzzer sound louder is to actively drive both sides of it with an opposite phase: when pin 1 is at 0V, pin 2 is at 3.3V and vice versa. This creates a voltage ...
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62
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DockerPi relay is wired backwards from others?
First off, apologies if I should have posted this elsewhere (such as under general electronics, etc.)
I have two relays (JBTek, DockerPi relay hat) I have been experimenting with to control input ...
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1
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460
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How can I control a 4026 counter chip from my raspberry pi?
I have a 4026 counter chip controlling a seven segment LED display.
The current set up is every time I press a button it advances by one digit on the display. See circuit below.
This circuit runs on ...
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85
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How to physically turn the a Raspberry Touch display on and off?
I use a Raspberry Pi Touch Display that I connect like shown in the following picture to my Raspberry. The black and red wires are connected to thee GND and 5v pins respectively. Now I want to ...
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3
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665
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eBoot Mini DC-DC Buck Converter to power Pi-4 B
I'm a noob so please have patience with me. I have a 12V power supply to charge a motor driver, that I also want to power my Raspberry Pi-4B. I bought these mini buck converters on Amazon:
https://...
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2
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649
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coin acceptor location instability (electricity)
i'm a software developer and a noob in electronics. I've built a photobooth for a friend of mine that runs by an ice cream stand.
The wiring is like this;
Coin acceptor | --> signal --> voltage ...
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