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Questions tagged [raspberry-pi]

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. There have been several generations of the device with improved performance, more memory, and more connectivity. This tag should be used for electrical engineering questions that involve the use of a Raspberry Pi. For questions about the Raspberry Pi itself see the raspberrypi.stackexchange.com Raspberry Pi specific forum.

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How make a pulse acquisition from an electrical meter directly into a raspberry pi?

I would like to acquire pulse informations from a french electrical meter. There is a picture of the outputs of this electrical meter. These pulses vary in frequency and after acquisition, we can ...
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0answers
49 views

Contact powered Pi with connectorless video signal [on hold]

Something that's bothered me for a while is a little device from a TTRPG. It's a simple thing, basically a portable computer the size of a silver dollar, which you put on a smart surface (basically ...
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2answers
54 views

What equipment would I need to detect and decode a signal coming from a scoreboard remote transmitting at 902 mhz [closed]

Would I be able to use some type of software defined radio receiver on a USB stick (https://www.adafruit.com/product/1497) to detect and decode a scoreboard remote transmitter operating at 902 mhz. ...
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1answer
30 views

Connecting a standalone temperature probe to a Raspberry Pi [closed]

I have a standalone temperature probe. I have also a raspberry pi. I would like to get the data from the temperature probe to the pi. I have thought about cutting the probe and using direct but ...
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0answers
29 views

Android Things SD card corrupt [migrated]

I am using Android Things with My raspberry pi 3 Model B. I flash the image file through etcher in the SD card. My app starts working for some days and after some days, SD card occurs corrupting and ...
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0answers
32 views

Micro USB female to micro USB male and mini USB male wiring [closed]

Hi I have a question about the wiring of the above setup. I have a raspberry pi and an lcd powered powered by a micro USB and mini USB respectively. I want to be able to connect them using only one ...
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1answer
32 views

MOSFET switch, ATtiny10, Raspberry Pi

I had posted a question earlier but I was using a BJT at the time and the solution provided led me to use a MOSFET for my application instead. I switched to the FET but still unable to provide stable ...
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0answers
38 views

Mbus Optical readout of energy meter?

I have a Sharky 775 energy meter, that I would like to read data from periodically, either using an Arduino/ESP8266/ESP32 or a Raspberry Pi and gather/display data via MQTT. The datasheet and ...
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0answers
42 views

Raspberry Pi wake-up and battery power circuit

I am working on a Raspberry Pi (3B plus) project that - at times -needs to operate on battery power, and on external power whenever available. The RPI needs to operate only when a dedicated sensor ...
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1answer
96 views

Calculate transistor collector and base resistors values for driving LED with GPIO

I try to learn how to use a transistor and how to calculate the necessary resistances. Here's what I calculate for the moment. I do not know at all if I left properly and if my equations are good. I ...
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2answers
69 views

Powering a servo with 9V battery and other questions

I'm working on a small project. I want to make an internet-connected dog food dispenser to attach to my dog's crate so I can dispatch a network command remotely to dispense it. I have a Raspberry Pi ...
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0answers
49 views

Connect industrial distance sensor to raspberry pi

I have this industrial sensor that I want to connect to the raspberry pi 3 model b+. Datasheet of the sensor is here. Given below is the connection diagram of the sensor: I need to connect the ...
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1answer
90 views

Transistor as a switch for 3A collector current

I am using: ATtiny10 w/ 10Ohm Resistor in series to drive Base of transistor Transistor is ZTX688B Vcc is 5V and 3A source Load is a Raspberry Pi connected to Collector simulate this circuit –...
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4answers
339 views

Voltage divider does not work with LM393 sound sensor

I have a sound sensor which I want to connect to a RaspberryPi. RaspberryPi input voltage on GPIO is 3.3V and this sound sensor output gives 5V. I've made voltage divider that looks like this: It ...
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1answer
40 views

Raspberry Pi 3 SPI speed and ADC sampling rate

I have been working on a project where I am collecting data from an AD8232 ECG sensor in my Raspberry Pi 3. The raw signal is so distorted and I am guessing I may have an issue with SPI speed and ...
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1answer
54 views

Inconsistent SPI communication between STM32F4 (Slave) and Raspberry Pi (Master)

I've been having a very specific issues with large SPI transaction and after few days of debugging and trying different approaches I haven't progressed anywhere. To briefly explain the system: Slave: ...
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0answers
34 views

How do I wire a Rasberry Pi 3B+ to a WS2812b RGB strip?

I am working on a project where I need to use a WS2812b RGB strip. I am really worried because I have already burnt 2 Raspberry Pis with my wiring. I just want to show my schematics, and be assured as ...
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2answers
61 views

Powering a 14v incandescent bulb with Raspberry Pi & Transistors

I am trying to drive 14V #73 incandescent wedge bulbs using a Raspberry PI and separate GPIO pins (which run at 3.3V), combined with transistors, to control them 100% electronically. I understand the ...
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0answers
32 views

adjustable voltage controlled current source with negative values

I have a MEMS mirror which can tilt based on the input current. The current can vary between -15mA to +15mA in order to change the angle of the mirror from -15 to +15 degree. Now, I need to have an ...
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1answer
33 views

Can I apply 12V intermittently to a 5V 28BYJ stepper motor?

As the title suggests, am I able to apply 12V to each winding of the 28BYJ (5V version) to increase the torque? I understand that it's not ideal as it will overheat, but it won't be running non-stop. ...
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0answers
24 views

Uln2003 stepper motor controller chip fried?

So I may have fried 6 boards and am a little unsure as to why. The apparatus is a rubiks cube solver. A quick Google search says the torque required to rotate a face is between 38mnm and 247mnm which ...
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3answers
68 views

Replace some LEDs with diodes in relay circuit

I need to know if I can replace the input LEDs (IN1, IN2, IN3, IN4) by a diode or resistor and if this can help me to reduce the voltage consumption generated by these LEDs. The circuit is a 4 relay ...
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1answer
29 views

Buck Converter and WS2812 LEDs

So to start off I am powering 70 LEDs through a 24V 6A power supply. The WS2812 LEDs require 5V operating voltage and about 50mA at their brightest setting (white light). I'm having this really ...
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0answers
56 views

Help identify RJ11 pins on a relay board - No152133

I'm tinkering with my garage door motor (Marantec Comfort 220) which have a RJ11 6-pin connector (X10) for an accessory relay board. The board consists of three (3) relays driven via the RJ11 ...
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3answers
62 views

Controling Mosfet by 3,3V Raspberry Pi GPIO Pin

So I'm currently working on a project where I need an IR camera with two IR Leds attached to it. The camera looks something like this: https://rads.stackoverflow.com/amzn/click/com/B01ICLLOZ8 These ...
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2answers
33 views

Power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and forward current of 100mA

I am looking to power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and current of 100mA. i want to make a circuit where i can use a small power supply or could I use the raspberry pi to power it? ...
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1answer
59 views

First time using a Raspberry 3B+ for 1.8v SPI BIOS flashing, I have some questions first

So this is the first time I'm attempting to flash a BIOS chip using a Raspberry Pi 3B+. I have the following items with me, a SOIC-8 clip, a Bi-Directional Logic Level Converter, and a Raspberry Pi ...
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0answers
22 views

RaspberryPi: Load cells and HX711 amplifier

I've created an app that will read 10 weighing scales at the same time with separate values but since some wires are like 1 meter long, I get so much noises in the values. I just wanna know if what's ...
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3answers
97 views

Raspberry Pi Super Capacitor On Battery Loss

I am looking to provide power to my raspberry Pi upon power loss from 5v power supply. It just needs to provide power long enough for the Pi to safely shutdown (with the setup I have, I am estimating ...
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2answers
147 views

Can i use I2C level shifters to power digital LED strips

Can I use I²C level shifters to power digital LED strips, more specifically, WS2812B strips? I can only find I²C level shifters, are they ok?
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1answer
62 views

Linux (OS) on Custom Hardware (Custom Motherboard)

We are designing and producing our custom high-speed boards consisting of FPGA and gigabit ethernet signals. Hence, we are not professional for high-speed motherboard design but know some issues like ...
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3answers
876 views

Can I connect a DC high voltage booster directly to my Raspberry Pi? [closed]

I have one of these modules: Is it safe to connect it to two pins to my Raspberry Pi, directly, and turn it on by emitting HIGH on one of the pins (the other ...
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1answer
31 views

Low current RPi GPIO inverter

What is the lowest current way of inverting the output from a GPIO pin? I have a solar board that has an add-on that can turn a USB port power off if a LiPO gets below 3.3v. The problem is, they ...
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0answers
35 views

MCP23017 working sporadically

So I've got two MCP23017's on the same I2C bus connected to a RPi. One is addressed 0x20, the other 0x24. The RPi is running my GUI which in turn controls the MCP's which switch 16-way relay boards. ...
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3answers
111 views

High resolution angular position (~0.5 degree) measurement [duplicate]

I am attempting to replace a light/mirror sensor to measure the slight low speed oscillations/ rotations of a disc over a period of time. I want to record the angular position, but I wanted to find a ...
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1answer
49 views

PCF8591 I2C Problems on Raspberry Pi

I am using 3 PCF8591 ADC connected via i2c to a raspberry pi. At first all 3 of the ADC worked. All of a sudden I started having issued with them. Occasionally one of the i2c devices stops showing up ...
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2answers
72 views

LED strip is flickering, but when I touch the data wire to the Raspberry Pi, it's almost fixed

simulate this circuit – Schematic created using CircuitLab Figure 2. Schematic tidied up by @Transistor. I have a Raspberry Pi which controls a 12V addressable LED strip. When the data wire is ...
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0answers
49 views

Raspberry Pi GPIO output not working with MOSFET N Channel Switch

My circuit is below - I'm trying to switch a solenoid valve using a Raspberry Pi. I have tested the MOSFET switch with the dedicated 3v3 pin on the Raspberry Pi, and have also tested that GPIO pin ...
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2answers
77 views

Addressing 45 Inputs Down to 6 pin Output

I'm looking for a chip which could minimize ~45 button inputs down to an 6 pin input for use with Raspberry Pi. I know this is a simple problem and it has likely been solved before, but as an ...
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0answers
39 views

L298N motor driver not working after connecting SPST switch

So when I had all wired as depicted in the first image, it worked fine, no problems. The red LED on the L298N board was illuminated and the dc motor was following commands from my Raspberry Pi. Now I ...
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2answers
81 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
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1answer
45 views

Unexpected results when measuring MPU6050 sample rate with RaspberryPi

MPU6050 datasheet says that maximum accelerometer data output is 1Khz, so in theory when measuring time it takes to receive 1000 data samples through I2C, so I should receive all data in no less than ...
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1answer
27 views

Switching 3.3V with a Raspberry Pi gpio pin

I recently bought an IR Camera for my Raspberry Pi, something like this: https://www.amazon.com/kuman-Raspberry-Camera-Module-Supports/dp/B01ICLLOZ8/ref=mp_s_a_1_17?crid=M3FSU2COLT5W&keywords=ir+...
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1answer
42 views

ADS1115 differential output

I have the output of a wheatstone bridge going into an ADS1115. I am exciting the bridge with a 24VDC supply and the ADS1115 with 3.3VDC through a Raspberry Pi. The issue I am having is that when I ...
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1answer
41 views

Voltage drop across buck converter

In my robot, I plan to have a GPIO pin on my Raspberry Pi connected to the insertion detection pin (pin 3) of a barrel jack (schematic here) so that my code can tell when the robot is externally ...
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1answer
41 views

ADS1256 ADC Not Reading Full Range

I am using an ADS1256 ADC chip (in the form of a Waveshare High-Precision AD/DA Board). I am using a 5V reference voltage, but I can't seem to read full scale. 0V reads out -344 bits (~0V) 3.3V ...
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1answer
70 views

Reading a MD25Q128SIG SPI flash memory with raspberry pi

I'm trying to read a MD25Q128SIG SPI flash memory with my raspberry pi, you can find its datasheet here: http://www.firstjit.com/Uploadfiles/20160121152131319.pdf Here are raspberry pi pinouts: Here ...
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1answer
21 views

(RasPi) Trying to control 2 different water pumps with different relays

PS: This is for a school project and I'm not very experienced with electronics. I'm trying to create a flush system. I need to control 2 different motors, it's a single iteration circuit with a timer,...
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1answer
45 views

Raspbery Pi GPIO + 7400 on a keyboard matrix. Source or sink?

I want to run a large switch matrix from a Raspberry Pi GPIO with the usual diode setup. I'm planning to chain some 74HC595 shift registers for the rows and read the columns from the Raspberry Pi GPIO....
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4answers
83 views

LiPo Voltage Drops

I am experiencing voltage drops with the following setup and I hope someone with mad electronics skills can explain my mistake to me: Raspberry Pi 3 Model B TFP401 Display Driver 7.0 Inch TFT Display ...