Questions tagged [peripherals]
Peripherals are devices connected to the Raspberry Pi, but external from it.
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When I put a bit in GPSET to 1, what is the actual mechanism that "reads" this register and put the electric line to HIGH Voltage? Who does this? How?
I don't know what is the actual mechanism.
When the CPU sets that register(GPSET)'s bit to 1, what entity/element reads that and is responsible to activate the electric line to HIGH? How is this done?
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Using DMA for efficient memory copying
Some background info about my problem:
I have an external device that is constantly giving me data through SPI
I handle SPI reads with DMA from userspace, as kernel based solutions (already ...
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USB sticks stop working with Windows 10 after being used with a Raspberry Pi 4 [closed]
I have a problem with my Raspberry Pi 4 2GB that involves USB sticks: I only have a minimal knowledge of both Linux and Raspbian so I don't know how to handle it.
My problem is: each time I use an USB ...
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Issue with DMA+PWM based signal generator
I want to generate some signal on GPIO pin on Raspberry PI Zero W using DMA control blocks and PWM to pace data. However I faced with some problems while trying to generate signal at ~10-50kHz.
When I ...
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Can I record HD 1080 p 60 fps through USB on a Raspberry Pi 3 or 4?
I have a set-top box with HDMI output and want to record some programs from it on a Raspberry Pi (model 3 or 4).
I found some HDMI to USB 3.0 converters with HDMI 'loop-out' which would enable us to ...
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Permission denied - Scheduling Witty Pi script
I am trying to create a new schedule for WittyPi (On/off scheduling of RaspberryPi). In the manual it seemed really easy (http://www.uugear.com/doc/WittyPi3_UserManual.pdf) but I fear I messed up ...
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How to connect raspi peripherals at a distance? [closed]
I would like to connect a few peripherals to my Raspi GPIO such as a access control keypad and ipcams. I know IPcams can run many meters on LAN cables but what is recommended for a peripheral such as ...
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Should I power RaspPI + peripherals from hub or use GPIO?
I’m planning my first “proper” Raspberry Pi project.
I want the end result to be user friendly, and so should use only a single power source.
But internally I need to power several separate devices: ...
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i2c communication problem with SSD1327 OLED display on a Pi 4
I have the following 128 x 128 OLED display:
http://www.lcdwiki.com/zh/1.5inch_OLED_Module_SKU:MC01503
which is driven by a SSD1327 module.
I'm trying to use this with a Pi 4 and the Luma.oled python ...
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What hardware peripherals might be capable of reading 6.144, or better yet, 9.216 megabits/second?
I'm hoping to interface a Raspberry Pi 4 with an 8 channel, 48 kHz ADC. Ideally a 24 bit ADC, which if my math is right means 9.216 megabits per second. But a 16 bit ADC would be acceptable: that ...
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How to restart/release rfcomm for bluetooth communication?
I am trying to connect raspberry pi to my galaxy note to use it for serial communication. I have somewhat succeeded at that.
First I paired it and trusted through bluetoothctl. Then I run sudo rfcomm ...
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Extend Official Display Connections
Is there a type of extender for the official Pi display connections? I don't mean the 15 pin FFC, but the two directly on the display. I'm mounting the driver board separately from the display in a ...
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Coin acceptor misbehave when connected on raspberry pi
I have a Bill note acceptor and a Coin acceptor, and I have wrote a program in C# to communicate with these two machines, and it worked perfectly on windows, after that I migrated this application to ...
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USB Dual Monitor DisplayLink Docking Station for Pi 4 B? I have WAVLink UG39DKx docking stations
My WavLink UG39DKx docking stations are USB 3.0, have an HDMI and DVI out, plus 2 USB 3.0 and 4 USB 2.0, plus Ethernet, plus Audio out.
Is there a reasonable way to get the docking station working? ...
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ADF support for scanadf on HP scanner
I have installed SANE and I'm trying to scan pages with the ADF (automatic document feeder) of my HP ScanJet 8250. I found scanadf, but it does not use the ADF for scanning. I now read at the end of ...
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Simple wireless camera with API recommendations
I have a whiteboard and want to build a setup where I can press a button and have a picture of the whiteboard delivered to google drive.
I have a raspberry pi that acts as a little toy server for ...
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Raspberry Pi 3B+ BLE peripheral : Android can't retrieve services list, OK with iPhone and Win10
I try to make a Raspberry Pi 3B+ act as a BLE peripheral.
I downloaded latest version (5.50) of bluez stack here : https://git.kernel.org/pub/scm/bluetooth/bluez.git.
I execute provided examples in /...
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PH-4502C pH Sensor Calibration and ADC using MCP3008, PCF8591, and ADS1115
I have a pH meter (DIY-4502C) hooked up with Raspberry Pi. However, the instructions to calibrate is in Chinese and seems outdated.
Does anybody know how to calibrate it for measuring pH4-7?
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Ejecting USB dslr camera
I'm using gphoto2 to capture images with my nikon dslr connected to a raspberry Zero W
My problem is that the camera stayes awake as long as there is a usb connection.
How can I eject the USB ...
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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 ...
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pxe boot works but USB ports don't
I'm running a PXE server that provide the boot files perfectly.
The raspbian jessie start well but the mouse and keyboard doesn't work.
to create the respo, i've done a rsync on a working image ...
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Stream remote pi+rasp camera to another computer?
Hi is it possible to stream the video feed from a pi camera (3 b+ model) across a LAN to another computer running Linux?
My idea is to see if pi can be used almost like an IP security camera where I ...
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Only allow a specific peripheral to be connected to a USB port
I am turning my raspberry pi prototype device into a market product. The data and the program running on the pi must be protected. But we have a USB webcam attached to it (provided by us, hence we ...
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Wiring on RPI3 when connecting two peripherals - microcontrollers simultaneously
I am currently having an ADC(MCP3008) connected to a rpi3, using the following wiring map, in order to read data from analog sensors.
MCP3008 -> RPI3
VDD -> 3.3V
VREF -> 3.3V
...
user94361
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Single channel SPI DMA
The documentation on the SPI peripheral says:
Two DMA channels are required, one to read from and one to write to the SPI.
Is this necessarily true? I have a device where I need to write a few ...
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Dalsa Genie GigE vision camera for Raspberry Pi
I am setting up a camera with my Raspberry Pi to test an optical layout on a high altitude balloon mission. I am using a Raspberry Pi model B. The camera will be required to take a still photo every ...
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SPI DMA and continuous transfers
I'm building a project using the MCP3914 8-channel analog front end (ie ADC) device connected to the Raspberry Pi's SPI peripheral.
The device has a continuous read mode where you request the value ...
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Do older raspberry pi accessories (specifically cameras) become obsoleted and experience reduced-price sales to the public? [closed]
I have an older Pi B with 512MB of RAM. I'm considering volunteering to help a local publicly funded park with a raspberry pi nature camera project, but I anticipate no funding from them, at least to ...
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How to interface to a Pi without knowing its IP or having a large HDMI monitor?
I wish to access a RPi's shell, but I do not wish to lug around some big display and ideally 120 volt power wouldn't be required. A Linux or Windows laptop are acceptable or maybe some other typical ...
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How get old Apple bluetooth keyboard and mouse recognised
I have an old Apple Bluetooth keyboard and mouse from about 12 years ago. They can still connect to my newer Mac laptop, but the Pi 3 bluetooth adaptor cannot see them at all. According to Apple's ...
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How to use the DMA-DREQ/PANIC threshold of the hardware-PWM
I'm using the hardware PWM that is described on page 138 of the BCM2835-ARM-Peripherals document.
The description of the DMAC-register (page 145) indicates that one can set the FIFO-threshold at ...
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SUID executable doesn't work for `/dev/mem` access
Here is explained how to gain access to the peripheral without being root.
I've just tried in my environment (Raspbian Stretch, RPi2, Qt5.9) in this way:
int main(int argc, char *argv[])
{
...
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Recording landline phone calls
My cell phone is recording all phone calls (using Automatical Call Recorder on Android) and this has helped me a lot of times (both because I didn't hear something very clearly or as evidence for ...
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Use Android phone as display for RPi3
I have Raspberry Pi 3 (connected to LAN and Internet via Ethernet cable) with:
Wi-Fi hotspot settled up and working;
TightVNC server running at startup. I can connect to it using my PC or Android ...
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Peripherals power usage
I am trying to measure the power usage of a Raspberry Pi peripheral, say a temperature sensor, and compare it with wall power input to the Raspi. Is there a device that measures the power a ...
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RPi 3 Model B: PSU, Measuring Voltage & Amps
I cannot, for the life of me, get enough power into my pi so the mouse & keyboard are operable. I have a RPi approved usb hub (Belkin: Hi-Speed USB 2.0 7-Port Hub) powering the mouse and the ...
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Shutdown Button for Raspberry Pi with HiFiBerry Amp+ HAT
I am able to create a shutdown (and reboot) button for a plain Raspi harnassing the fact, that shorting Pin 5 to GND will reboot the Pi if shutdown.
However, when adding the HifiBerry HAT things ...
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How to operate a cooling fan using GPIO pins, RaspPi2
I have little to no experience with any form of computer software coding/editing but I have managed to get EmulationStation working (sort of) on my Raspberry Pi 2. I have a bought a fan and plugged it ...
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Looking for a simple RaspberryPi keyboard with USB hub to connect mouse to [closed]
I have a RaspberryPi model B with 2 USB ports and I would like to connect 3 devices:
Keyboard
Mouse
USB Flash Disk
I would like to do this without using extra USB powered hub.
Is there any low-...
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Problem installing Bluetooth Dongle on Raspberry Pi 2 running Windows 10 IOT Core
I recently got an Orico BTA-403 (officially supported) bluetooth dongle and inserted it into my Raspberry Pi 2, Model B running the most recent version of Windows 10 IOT core. I rebooted, and then...
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Using Pi 2 as feedthrough of mouse/keyboard to computer
The goal is to connect a mouse to my raspberry Pi, and have it connected to a computer (both linux and windows will be used). I want to have a LED light up whenever I use a right mouse click. So the ...
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Driving 32x32 LED grid via GPIO preventing other processes from running
I have a project running a 32x32 LED grid based on these instructions:
https://learn.adafruit.com/adafruit-rgb-matrix-plus-real-time-clock-hat-for-raspberry-pi/driving-matrices
which relies on these ...
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My USB2VGA is working - How do I configure X to use that screen?
I have a green screen on my USB2VGA connection (DisplayLink). How do I configure X to use the screen /dev/fb1 which exists? I do not find an xorg.conf.
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How to setup resistive LCD touchscreen over SPI
I've been following a guide for setting up an LCD touchscreen, without success. When the screen is plugged into the GPIO pins it just shows a white screen. After all my attempts it remains white.
...
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For communicating with a modbus rtu slave using rs485 to usb converter, does Raspberry Pi require any configuration?
I have a modbus slave device and a rs485 to usb converter. I used the converter and successfully read data from the slave device with my laptop but when I try to use it with the Raspberry Pi I am ...
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Use Rasberry Pi's Usb Ports for Broken Computer
The usb ports on my macbook pro are broken, so I thought that it would be possible to connect it to my raspberry pi over a local wifi network (or something like that) so that I can use usb devices, ...
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Adafruit Retrogame library will not send character press events
I'm trying to build a small arcade cabinet powered by the Raspberry Pi 2. I've got several arcade buttons (for ABXY, Insert Coin/Select and Start) and an 8-way joystick.
I'm following the tutorial ...
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Raspberry Pi (Low) Power - Damage?
If the Raspberry Pi B+ is not receiving enough power and I try to use it, will it damage my Pi or peripherals?
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send_packet: Network is unreachable Huawei E3351 3G Dongle
I have a Huawei E3351 3G dongle connected to a Pi which requires maximum unattended uptime. Ensuring that the connection remains solid over time has been a troublesome endeavour, largely due to ...
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Precision ADCs for Raspberry Pi to minimize Gibbs phenomenon?
I would like to generate stable volts from 0 to 5 and to minimize Gibbs phenomenon without losing measurement data.
I get much sudden peaks in Raspberry Pi 1/2 which I can control by adding low-pass ...
