Raspberry Pi Stack Exchange
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1500 questions
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5 answers

How to display an image via ssh?

I have connected to my raspberry via ssh from another pc. I would like to show an image that is on my raspberry to the screen of my PC. I tried to follow the answer of this question by astrogeek. Suppose my raspberry user is pi and the user pc is…
Francesco Boi
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2 answers

How to exit a python daemon cleanly?

I want a simple python script to run in background, therefore I configured daemon test.service in /etc/systemd/system/. [Unit] Description=Test service After=multi-user.target [Service] Type=simple ExecStart=/usr/bin/python…
EarlyEarl
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2 answers

How to configure serial port settings of /dev/ttyAMA0?

I want to access the serial port by some BASH script files via /dev/ttyAMA0. How do I configure the serial port settings like speed, parity even/odd?
Robert
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10
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2 answers

Controlling 400 LEDs from a raspberry pi

I have a client who has several large bronze signboards, each with 100-150 little light bulbs on it, totaling approximately 400 bulbs. The bulbs are turned on and off on a schedule, currently by hand (partially unscrewing the bulbs that are not…
Moshe Katz
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10
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1 answer

How to make a simple, reliable 15-second UPS for shutdown?

Use case: On power loss, the pi is to gracefully close all I/O (already kept to a minimum) and shut down, to be manually rebooted later. A supercapacitor works (I think; not sure of voltage near the end) but reboots the Pi (not sure why exactly). A…
kaay
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5 answers

MAX98357 I2S DAC support (kernel drivers?) and noise ("pop", "crackle") on playback

I am trying a Adafruit I2S 3W Stereo Speaker Bonnet for Raspberry Pi - Mini Kit, which is built around two MAX98357 (datasheet: adafruit, maxim), on a Raspberry Pi Zero W with Raspbian Stretch (upgraded yesterday). The trouble is that I have "pops"…
handle
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10
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6 answers

Setting up Bluetooth dongle

I am trying to get my Bluetooth dongle set up. When I search for it using lsusb, the following comes up in the terminal: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. Bus…
user7130
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3 answers

How can I find the MAC address of my Wi-Fi interface?

I want to determine the MAC-address of my Wi-Fi interface on a Raspberry Pi Z W running Raspbian Lite. Is there a command that I can run to tell me this? Is there a device in the /proc tree that will disclose it?
Bex
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1 answer

How to use Raspberry Pi 3 as a USB gadget

How can I use Raspberry Pi 3 as a USB gadget. Is there any way? How can I enable the USB gadget mode on Raspberry Pi?
Naveen
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1 answer

Bluetooth does not work with Raspbian Stretch and Raspberry Pi 3

On a new install of Raspbian Stretch, log in and with the first command of systemctl status bluetooth, I get: $ systemctl status bluetooth ● bluetooth.service - Bluetooth service Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled;…
Roxy
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6 answers

ssh not working

I am not able to ssh into my pi. RPI is connected directly to my host PC. I have set IP address of my host :---- sudo ifconfig eth0 192.168.0.204 netmask 255.255.255.0 up sudo route add default gw 192.168.0.200 Pi have default IP in network…
Allan
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10
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2 answers

How to install OpenSSL 1.0.2 on Raspberry Pi3

How do I install OpenSSL 1.0.2 version in Debian (Raspberry Pi3) OS. It just installs OpenSSL 1.0.1 automatically. I require version later than this i.e. 1.0.2* which supports DTLS. Please help how to install latest version
Jyoti Raj Sharma
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10
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4 answers

NUT + CyberPower data stale

I've got upsmon (nut-client) and upsd (nut-server) set up and almost fully working on an RPi3. Connected is a CP1500PFCLCD UPS via USB. upsd and upsmon start up perfectly every time. However, given about 2-20 hours of uptime, a "data stale" error…
Malachi
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2 answers

Fixing issues with Powered USB Hub

With my PI I'm trying to use the F4U018 Belkin 7 port hub (yes - the one on the problem list). Its one of three I have around, all of which happen to be on the problem list - I don't want to shell out for another one. The RPi/Hub is working fine…
Jon Egerton
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4 answers

RPI zero W as both Wifi client and access point

Everything points to that the Raspberry Pi Zero W can be access point and connect to wifi at the same time. According to this article, with the command iw list describes: valid interface combinations: * #{ managed } <= 1, #{ P2P-device } <= 1, #{…
Mario
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