9 votes
Accepted

PoE hat fan activation on OS other than Raspbian

I'm using Ubuntu Server 20.04 LTS. The dtparams setting does not work, instead you need a udev rule. The fan config is in /sys/class/thermal/cooling_device0/, if you cat /sys/class/thermal/...
Luke Channings's user avatar
6 votes

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

Yes it's possible. The headers on the POE hat are passthrough style, but the pins on the Pi are too short to pass through them, so you need to extend the Pi's GPIO header, in turn this means you also ...
Peter Green's user avatar
  • 6,476
6 votes

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

OR, you could use just a PoE Splitter which is half the price of a PoE Hat and avoids the issue of trying to stack multiple hats on top of each other. I paid £9.90 for the GB version of the PoE ...
F1Linux's user avatar
  • 1,667
6 votes

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

You can buy stackable headers, which you could solder to the PoE HAT. You could probably use without soldering as the PoE HAT seems to make no use of the Pi GPIO. Any HAT mounted on top of the PoE ...
Milliways's user avatar
  • 60k
5 votes

How to approximate room temperature in a better way

That's the main problem with the Enviro pHAT, and the SenseHAT for that matter - proximity to the Pi affecting results. You're better off getting a Dallas 1-wire temperature sensor, preferably one ...
recantha's user avatar
  • 4,489
4 votes

Same lipo power source for raspberry pi and motor hat

You will quickly face 2 problems : voltage and current. Voltage You battery produce 3.7V, the Raspberry use 5V, your motor 6-9V. You will basically needs two DC-DC step-up voltage converter to produce ...
Technico.top's user avatar
  • 1,406
4 votes
Accepted

Stepper Motor Hat v0.1 - pre-soldered version

I didn't get any answers, so I tried the random things method. It seems to work now and I have the addresses needed for the servos from ic2detect. Solution: you MUST boot up the Pi with the HAT ...
CaptStephan's user avatar
4 votes
Accepted

Stacking multiple TV hats

It's not possible because there's no way to change the SPI chip select pin from CE0. https://www.raspberrypi.org/forums/viewtopic.php?t=227520 https://www.raspberrypi.org/forums/viewtopic.php?t=...
Dougie's user avatar
  • 5,311
4 votes

Does a hat designed for RPi 2 B still work on Rpi4 (GPIO compatbility)?

The official design specification for a Raspberry Pi HAT hasn't changed since 2014 when the current form-factor was launched with the RPiB+. There's no hardware reason why a HAT for a RPi2B won't run ...
Dougie's user avatar
  • 5,311
3 votes

How to approximate room temperature in a better way

If you really don't want to extend the temperature sensor away from the Pi, it may be possible to compensate for the effect of the CPU. This post on yaab-arduino.blogspot.co.uk outlines an attempt at ...
goobering's user avatar
  • 10.7k
3 votes

Raspberry pi HAT device-tree

This page in the documentation (section 3.5) states: As of Linux 4.4, the RPi kernels support the dynamic loading of overlays and parameters. Compatible kernels manage a stack of overlays that are ...
KennetRunner's user avatar
  • 1,050
3 votes

PoE hat fan activation on OS other than Raspbian

Using 21.04, if you add this line to /boot/firmware/config.txt it should work. It seems to work a little better after doing an apt upgrade and rebooting. dtoverlay=rpi-poe
Derrick's user avatar
  • 31
3 votes

Waveshare SIM7600E-H no wwan0 interface when connected to Raspberry Pi 4 model B

In case anyone has also issues. The link to the raspberry pi forum helped me. Following steps are working for me. #install the packages sudo apt-get update && sudo apt-get install libqmi-utils ...
NoobNoob's user avatar
3 votes
Accepted

How to detect list of available sensors and actuators reside on a HAT?

There is nothing in HAT requirements about supplying a machine-readable list of sensors. Therefore, there is no generic methods to list sensors on a HAT: even if such a method exists, it will be ...
Dmitry Grigoryev's user avatar
3 votes
Accepted

WaveShare e-Paper HAT button covers

This question fits the 3D printing world to a Tee. My search efforts found different 3D printed cases to fit other e-ink products, but not one specifically designed for your model. One may be able to ...
fred_dot_u's user avatar
2 votes

Disabling Hat EEPROM scan

I am a silly person who can't google! ShiftPlusOne says... ...but you should be able to just add bcm2708.vc_i2c_override=1 to cmdline.txt and use it like you normally would. B+ disable ID_EEPROM
Alexander M's user avatar
2 votes
Accepted

Raspberry pi HAT id Vendor id Product origin

Per this Pi Foundation forum thread There will be no registry maintained for ID data. You are free to use whatever data you want in the vendor fields of the "vendor info" EEPROM atom (0x0001), ...
Steve Robillard's user avatar
2 votes
Accepted

EEPROM Raspberry pi HAT read

The HAT spec basically calls for the EEPROM to be an I2C device slaved on address 0x50 (which is more-or-less an industry default). At boot time, the device tree layout and other stuff is read from ...
BJ Black's user avatar
  • 576
2 votes
Accepted

Raspberry Pi Sense HAT on Rpi 3?

The 3 has the same form factor as the 2/0/+ models, with the same 40 pin GPIO header, so yes. The buses involved will work the same way, hence so should the software.
goldilocks's user avatar
  • 58.9k
2 votes
Accepted

pHAT DAC 3.5mm solder pins

Looking at the image of the device here, hopefully reproduced below: It ought to be possible to unsolder the five surface mount connections that attach the 3.5 stereo socket to the PWB and connect ...
SlySven's user avatar
  • 3,621
2 votes
Accepted

Configure ALSA Sound card

You can play from either, as long as the kernel modules for both are loaded. The method for doing this is as follows : Stop lxpanel Unload the audio drivers (rmmod or modprobe -r) Load the audio ...
Matt's user avatar
  • 966
2 votes

Cirrus Logic Audio card replacement for recording

Depending on what you are actually trying to do, you may not need an audio device. If you end up dumping the audio stream in a file and then run some calculation on it, you might as well use a data ...
Dmitry Grigoryev's user avatar
2 votes
Accepted

Waveshare GSM/GPRS/GNSS HAT not connecting to Cellular network

I have this same HAT and I've just gotten it working. Here's an overview that may help. Ensure both jumpers are set to setting 'A' for USB operation Test connection to the device by connecting a ...
isaacparrot's user avatar
2 votes

Raspberry Pi 3 Prototyping Breadboard HAT

For anyone finding this on Google, here's the answer based on what @jaromanda and @dougie commented... The holes I coloured green are connected to the corresponding holes in the GPIO connector, so to ...
Jonathan's user avatar
  • 354
2 votes

Pi 3 can't detect servo hat

The I2C bus is implemented on pins 3 and 5 of the Pi (GPIO 2 and 3, see https://pinout.xyz/). You need to concentrate your efforts to make sure there are no shorts or similar defects on those pins. ...
joan's user avatar
  • 71k
2 votes

Network Hats for Raspberry Pi 3

I suspect the HAT you're looking for is the PiJack HAT, although intended for the Pi Zero I see no reason why it couldn't be persuaded to work on your Pi 3. Otherwise you may need to roll-your-own HAT ...
Roger Jones's user avatar
  • 1,494
2 votes

Control motors and servos simultaneously (Python)

See https://www.youtube.com/watch?v=rrRg1guojQE This shows (my) pigpio library being used to control a variety of devices. A Raspberry Pi controlling a variety of motors and sensors. The pan-...
joan's user avatar
  • 71k
2 votes

Pi HAT Waveform Generator for Raspberry Pi 3B+

Pi HAT Waveform Generator for Raspberry Pi 3B+ 300 kHz sine waves at about 8 samples per waveform Sampling rate required is around 2.5 MSps. Have you considered the function generator modules? ...
tlfong01's user avatar
  • 4,675
2 votes

PoE hat fan activation on OS other than Raspbian

I'm also using 20.04 on Raspberry Pi 4s. After googling around, there is a config.txt at /boot/firmware/config.txt and the following example worked for me in that file: dtparam=poe_fan_temp0=80000,...
dsmith8's user avatar
  • 21
2 votes
Accepted

USB ports on USB hat not recognised

I will assume you have this USB hat: Never used it myself, but according to the wiki: You have to attach the USB HUB HAT to a Raspberry Pi B+/2B/3B with a USB cable Have you done that?
Botspot's user avatar
  • 1,769

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