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 Raspberry Pi specific forum (raspberrypi.stackexchange.com).
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Is there a switch that turns on when it detects a "pull" of a few grams on a string?
I'm working on my first Raspberry Pi project. I'd like to turn my project "on" when a force, of a few grams, is applied to a string (i.e. "pull the string" to turn the unit on, the ...
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What to do with unused pins in PCB board of Raspberry Pi 4 Compute Module?
I'm trying to make a PCB board for Raspberry Pi 4 Compute Module and I will only use power pins, one HDMI connector pins, one USB connector and UART pins (Tx and Rx) only. The rest of the pins will ...
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Powering Raspberry Pi and 11 servos on one battery pack
I am working on making Sox from Lightyear using a Raspberry Pi as the main board. I have a PCA9685 servo controller that can drive up to 16 servos using I2C.
The issue I am facing is that my X728 ...
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Read multiple PT100 sensors with MAX31865
I'm building a temperature logger with four PT100 sensors. I've already decided to use a MAX31865 converter (just the IC), 3-wire PT100s and the device will be a Raspberry PI HAT - the PI will talk to ...
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Tuning photoresistor circuit with resistors
I've done small circuits for a long time, although nothing more than a few basic ones. I am now trying to control an IO-signal to Raspberry Pi. Since Raspberry Pi doesn't have analog pins, I came ...
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Connecting multiple same chips with the same address and function on single I2C bus
I'm designing a backlight board with two Texas Instruments TPS61177A. Both chips will work in tandem.
Two TPS61177A are connected to single I2C master.
About TPS61177A: The device has only six I2C ...
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Using MAX7301 GPIO Expander for Raspberry Pi Switching and Chip Selecting
I'm designing a PCB that uses Analog Devices' MAX7301AAX GPIO Expander IC to expand the Raspberry PI's GPIOs.
Digikey MAX7301
The reason I'm using this IC is that my application requires a lot of ...
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How to convert from datasheet dB value to pressure per volt?
I am trying to measure sound waves using a raspberry pi pico ADC pin but am having trouble converting the sensitivity value on my data sheet into pressure units per volt.
I have read a many articles ...
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What determines an electret microphone voltage?
I am trying to get an electret microphone working with my Raspberry Pi Pico's ADC pin. I am trying to detect the output by passing it through a transistor.
I have a 4.5V voltage source. I split this ...
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Interfacting a device's PCM output with a RPi?
I am planning to use a SIM7080G for a future project. However, I am facing an issue with the way it handles audio.
The SIM7080G has a PCM interface, which, according to the hardware design guide, is ...
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Connecting Raspberry Pi UART to Arduino Uno
AFAIK the RPi uses 3.3 V logic and the Uno uses 5 V logic.
So I need a level shifter to convert the logic levels.
I have purchased a bi-directional level shifter.
I want to check if I have wired it ...
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How can I connect the DVP camera output with Raspberry Pi or other MCU?
I have a MT9V034 image sensor module and I want to use its 8-bit DVP output. Does anyone know how to connect a DVP interface with a Raspberry Pi and show some graph?
I have read the Raspberry Pi user ...
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Animating 3600 neopixels with RPi is slow
I have SPI RGB led strip with three wires connection:
– TX1818 driver (manufacturer says “it’s compatible with TM1812, UCS1903, SM16703, WS2811–2815”)
– 12V, 9.3 W/m, 5060, 60/metre
– 3600 pixels, 60 ...
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Pi Pico generating YPbPr-like signal for VGA monitor
I would like to generate TED-like signal for VGA monitor input (Analog RGB + H/V-Sync). This is basically 16 pre-defined chroma values with 8 brightness levels applied, encoded as 7 bits: ...
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Can Raspberry Pi be used for LVDS image signal reconstruction
I have a NOIP3SN5000A image sensor manufactured by Onsemi with a LVDS output. I would like to reconstruct the output signals into images by a Raspberry Pi 4B, can it work?
I have seen a lot of ...
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Why does an electret not pick up sound?
I am trying to get an electret mic to detect sound, which I can then pick up using a Raspberry Pi Pico ADC pin.
My electret has two output pins. One is connected to ground, the other is connected to ...
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Can I connect this IPS display to a Raspberry Pi (or any SBC for that matter)
Can I use this display with a Raspberry Pi or any other SBC? It's a 640 x 480 IPS display with a 30 pin, 05mm pitch flex cable at the end of it. I've been trying to look for a connector or something ...
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AND logic gate with diodes not working
I am currently working on an AND logic gate using 2 diodes.
My first logic input is 3.3V/5mA from a Raspberry Pi Zero W GPIO pin.
The second is 3.3V/500mA from a door access system. This input is ...
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Connection Raspberry Pi GPIO to a 5v signal that isn't powered by the Pi
I have a HBaseT Matrix (EL-4KPM-V88-A2416) that has 3.5mm mono (signal+ground) plugs that is used to send IR codes to HDMI devices (it would usually be connected to an IR emitting diode placed in ...
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Project design review resources
I've spent the past week or so working on my first circuit board project, and I'm wondering what resources are available online or otherwise for reviewing and checking my design. I want to check to ...
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Transmitting a button press 200 meters using RPi
I'm working on a timing system for track meets, so I need to be able to transmit a signal -- a button press -- from the starter at the 200m start, to the finish line where the camera equipment is.
My ...
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HX711 gaps in data
I am using an HX711 connected to a Raspberry Pi Pico to read some load cells and send the data up to a Raspberry Pi via USB. Using Python library for the HX711.
I am chasing an intermittent problem ...
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Shielding Buck Converter
I have a simple question, and I want to ensure that nothing unexpected happens. I'm currently working on a Raspberry Pi-based robot project with a Pi camera, and I plan to power it with a battery, ...
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LED controlled by MOSFET is always on
In my circuit I am attempting to control a LED's brightness via a PWM signal applied to a MOSFET (which then provides power to the LED). This is shown in the image below; power comes in via USB(orange)...
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Raspberry Pi Pico W not executing main.py when connected with ammeter
I am trying to measure the current flow of a Raspberry Pi Pico W running simple code that blinks the onboard LED saved as 'main.py'. I have verified this code runs when connected to a) my laptop and b)...
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How to read the SN74LVC245A datasheet
I'm looking for help with how to read datasheets. For the below application, specifically what in the datasheets is it that would help me choose between these components? (datasheet for SN74LVC245A.)
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Connecting and charging 2 gopro cameras to a raspberry pi further away than 3 meters
I want to connect 2 gopro cameras via usb to a raspberry pi, and charge them as well.
Because the raspberry pi can't provide enough current via its usb ports, I'm injecting 12v from the same power ...
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Breadboard Power Supplies get hot in <2mns of runtime
I am trying to power 2 Raspberry Pi Pico's with one breadboard power supply (found here). When I connect a 9V battery to the supply (and have ensured correct wiring, correct rail polarity, etc), the ...
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How to perform image windowing on the OV5647 CMOS sensor?
I have an Arducam 5MP OV5647 Motorized Focus CMOS camera module (which is the same as a regular 5MP Raspberry Pi Camera, but with a motorized lens for manual focusing).
https://www.arducam.com/...
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How do I run two NEMA 17 stepper motor from a 5v 3a powerbank?
The motors are 2 phased 4 wires 3.3v @ 1.5a, and I need them to run from a powerbank, how do I control and provide the motors with power? Which drivers are needed? They will be controlled by a ...
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Determining Power Supply Requirements for an 8x4 Grid Display of Chained 32x64 Pixel LED Matrices
I am planning to build an 8x4 grid display using chained 32x64 pixel LED matrices driven by a Raspberry Pi, and I've found mixed information online about the power supply required for such a setup. ...
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Pump control with a Raspberry Pi
Pump control Raspberry Pi
I am planning to control a small water pump with my Raspberry Pi. The 24V pump needs quite a bit of current (~1A) so thats why I got a transistor output card with an I2C ...
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How to connect Raspberry Pi USB to a custom USB PCB?
I'm designing a PCB that I wish to connect to a Raspberry Pi Zero W through USB, how should I approach that?
I have the inputs from the module (D+, D-, etc.) but to connect them to the Pi Zero, do I ...
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Inconsistent results on digital inputs (circuit review)
I am attempting to make a prototype automated testing jig for a ESP32S3 board with a Raspberry PI 3B+.
I am getting inconsistent results when reading the digital outputs state of the ESP32S3 on the ...
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Controlling a 10V PWM LED driver (MEAN WELL HLG-185H-C1400B) with Raspberry Pi
I am working on a project where I need to dim a set of LEDs by utilizing the PWM signal on a Mean Well HLG-185H-C1400B.
As a beginner, I am seeking guidance on how to control a 10V PWM LED using a ...
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Introducing a MOSFET to a circuit
I have ordered the following MOSFET from aliexpress, ran some checks on it and it seems fine.
I read in the above question (which fits my desired circuit) that "most MOSFETs won't work with an ...
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Raspberry pi inside CRT TV - piggyback off a 220v line on a TV main board?
I would like to mount a Raspberry Pi device inside an old CRT TV (yes, I am well aware of CRT safety protocols, I've been restoring them for a few years now).
The Raspberry Pi is powered using 5 volts ...
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DHT22 Sensor fails in dry environment
I'm wondering if anyone has any insight into a problem I'm experiencing with a DHT22 sensor. I'm using it try and take reading from within a Filament Dry Box for 3D printing, meaning I've added silica ...
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Is USB 2.0 Shield Wiring Necessary For a Power Only Connection? (Power Supply to Raspberry Pi)
I am building a low ripple power supply for my Raspberry Pi Zero 2W + DAC combo.
The output of my power supply will be a female USB A 2.0 connector, using a regular USB A to Micro B cable to power my ...
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Issues driving 3W RGB LED (common anode): Can't light all 3 colors at once
I hate asking advice somewhere that I can contribute little so trust when I say that I have logged many, many hours researching this.. have watched every relevant video on YouTube I can find, every ...
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Can the Raspi Pico handle 10V
I am currently trying to restart a long forgotten project of mine, because it started to bug a little. I now want to make the project more sophisticated (by not using jumper cables in "production&...
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I2C issue communicating with an analog to digital converter mux ADS1015 through TCA9548A I2C multiplexor
I am using a Raspberry Pi Zero 2 to talk through a TCA9548A to multiple ADS1015, each ADS1015 is on a separate SDA/SCL channel of the TCA9548A. I am able to scan all channels and see the active ...
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Tap power from 3D printer PSU to a Raspberry Pi 4
Would it be possible to power a Raspberry Pi 4 by tapping some power from the PSU of an Elegoo Neptune 3 Plus printer? Since the Raspberry Pi requires 5V to run I understand that I would have to get a ...
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How to test Raspberry Pi Pico after soldering header pins?
I just got my first Raspberry Pi Pico and I don't have any experience in electrical enginering.
The book I'm following indicates that I first have to solder the and the first step is to solder the ...
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Multiple individually controlled lights and buttons widely separated [closed]
UPDATED:
I am building a sorting system using lights and buttons. The function is I have multiple items in a bucket I would like to sort to several different bins.
What I would like to have is up to ...
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I2C Data Line Holding Low for 10 Seconds
I am currently working on a device that has a total of 20 I2C devices connected to it. This includes 4 ADS1115 modules, 3 MCP23017 GPIO extenders, 4 NAU7802 weight scale modules with a TCA9548A ...
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RPi Pico and OV2640 using C/C++ SDK
I am trying to connect an OV2640 with RPi Pico using the C++ SDK to get images over UART.
I found this library but I have been on this for days but cant figure out the PIN connection. I tried reading ...
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Raspberry Pi Controlling Servo and timer
I would like to create a program that uses a Raspberry Pi Pico, this display: https://thepihut.com/products/four-digit-seven-segment-display-red, SG90 micro servos, and one of these buttons: https://...
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How to program Raspberry Pi tiny RP 2040
I am trying to program my tiny RP 2040 board for the first time. I have generated the uf2 file and try to connect the board via USB to have it as a mounted USB drive. However, after holding the boot ...
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