Questions tagged [peripherals]

Peripherals are devices connected to the Raspberry Pi, but external from it.

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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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3 votes
1 answer
646 views

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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1 vote
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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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2 votes
2 answers
673 views

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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4 votes
3 answers
430 views

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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1 answer
2k views

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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2 votes
0 answers
69 views

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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1 answer
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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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3 votes
4 answers
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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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3 votes
3 answers
18k views

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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4 votes
2 answers
282 views

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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1 vote
1 answer
118 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 ...
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1 answer
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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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1 vote
2 answers
1k views

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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1 answer
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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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1 answer
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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 ...
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1 vote
2 answers
382 views

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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3 votes
2 answers
2k views

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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0 answers
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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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0 votes
2 answers
308 views

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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2 votes
0 answers
77 views

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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1 answer
415 views

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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  • 479
2 votes
1 answer
2k views

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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1 vote
2 answers
2k views

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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1 vote
2 answers
185 views

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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4 votes
2 answers
6k views

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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  • 143
2 votes
1 answer
2k views

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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2 votes
2 answers
2k views

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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-1 votes
2 answers
202 views

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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1 vote
0 answers
279 views

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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3 votes
3 answers
3k views

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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0 votes
2 answers
365 views

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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1 vote
0 answers
75 views

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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2 votes
0 answers
3k views

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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2 votes
1 answer
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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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2 votes
5 answers
249 views

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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3 votes
0 answers
230 views

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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4 votes
2 answers
734 views

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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1 vote
0 answers
633 views

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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0 answers
338 views

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 ...
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0 votes
2 answers
1k views

Raspberry pi location detection [closed]

Id like to create a small "car" alike robot (4 wheels and steering via servo) that will travel around my house. Id like the robot to be able to go and charge itself when its batteries are low, I do ...
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1 vote
1 answer
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powering raspberry pi B+ through the USB port

I am enclosing my raspberry pi B+ into a camera case due to which the micro USB power plug on the pi is not accessible, I was thinking of powering it through the normal USB port. https://www.youtube....
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