Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

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1500 questions
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3 answers

How can I delay the startup of systemd services until the datetime is set (no RTC on the Raspberry Pi)

When I shutdown and power off the Raspberry Pi 3b and then power it up again the next day, I get wrong starting date/time printed when checking sudo systemctl status DustSensor. The printed date/time is from the date/time of the shutdown. How can I…
monok
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How to known if an ARM library (.so) is compatible with the raspberry PI

I have a compiled library (without source) for a fingerprint driver. I'm sure it's an ARM compilation because the command file mylib.so says: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked, not stripped but if I want use…
Gilles Grandguillaume
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Raspberry Pi DHCP Server: clients not getting IP addresses

I am relatively new to networking, so please bear with me. For a purely educational project, I've set up a network where the Raspberry Pi 3 running Raspbian Stretch is to function both as a router and a DHCP server. The intention is to have a…
Flux
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4 answers

How to Wake the Raspbery Pi Display Without Disabling The Screensaver

People have asked how to disable the screen from going blank or to sleep, but I have a slightly different question. I would like to be able to remotely wake a sleeping or blank display, but then allow it to go blank again. So far this isn't…
GrandAdmiral
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3 answers

How to make Raspberry Pi suspend to RAM?

My application only uses Pi very occassionally and only a few seconds each time. It would be ideal if Pi supports suspend to RAM feature to save maximum energy. (I am thinking of the next step of powering Pi with batterries only.) My question is:…
Penghe Geng
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3 answers

Is it possible to use an additional HAT with the Raspberry Pi PoE HAT

I recently got a Raspberry Pi 3 Model B+ and the official Raspberry Pi PoE HAT. It is powering it from my switch fine but I am wondering if it is possible to also use an additional HAT with it? The PoE HAT seem to allow pins to pass all the way…
njh
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Green LED blinking 7 times with rainbow colour image on screen

I have a Raspberry Pi 3 b. I tried to boot it to android things OS. But when I connect the Pi to power, it is showing nothing except a rainbow colour screen and the green led is blinking 7 times. Please help me correct this issue?
Jackie
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5 answers

Creating an HDMI Pass-Through Connection

I would be very interested to know if anyone on here might be able to provide some insights into the feasibility and/or proper approach to add a HDMI input to the Raspberry Pi in an effort to allow the raspberry pi to consume content from this port.…
NetConstructor.com
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Toggling a GPIO pin set as output

I read here that I could toggle the state of a GPIO pin set to output in Python using the following command: GPIO.output(LED, not GPIO.input(LED)) where LED is the pin value. I can turn the LED on using the following code: import RPi.GPIO as…
bobthechemist
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How to stream sound to a bluetooth device from a raspberry pi zero

I have a raspberry pi zero W and I would like to stream sound over bluetooth to a bluetooth-enabled speaker / headphone. So how to achieve this with alsa?
Besi
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How to correctly restart wpa_supplicant debug with networkd-systemd?

I am trying to debug setting up wifi with networkd-systemd managing wpa_supplicant. The overall objective is to get wifi AP and managed client modes working at the same time. I can get managed client working. I can't get the AP mode working. To…
dazz
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3 answers

Enabling audible terminal bell/beep on wheezy

I am trying to enable an audible terminal bell/beep through the 1/8" mini-rca audio out (headphone jack) on debian wheezy with the rapsberry pi model b. Normal audio works as expected, when playing a shockwave file in Midori with gnash for…
humbolight
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pi1, armv6, how to disable armhf packages?

I dusted off a Pi 1, which is armv6, then installed Raspbian on it. The base OS works, but many of the packages I install won't even start- they say illegal instruction. That's because the armhf binary packages are being installed, which isn't…
300D7309EF17
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GPIO Interrupt debounce

I was following this guide, Raspberry Pi GPIO interrupts in kernel space, to create a kernel module handling GPIO interrupt. The problem is that this code doesn't have software debounce implemented. Can you please give me advice about how software…
Flavio Barisi
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What Pi Model & OS version is installed

Users often seem confused about what Pi model they have and what OS version is installed or how to find details. Where is this located?
Milliways
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