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Questions tagged [hat]

A "hat" is an add on board designed specifically to fit on top of the pi via the GPIO header. They have a small EEPROM chip which is used to configure them, but may be built to serve any purpose.

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566 views

Google AIY Kit compatibility

I wanted to combine the google kit with a relay board to allow voice controlled power outlets on my Pi 3 model B. Is it possible to use a relay and the google hats at the same time? I can’t find ...
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1answer
503 views

Help with Wiring Multiple HATs to GPIO

first time poster. Sorry in advance if this is the wrong place/title/etc. I'm currently working on a senior design project for mechanical engineering, but it requires some basic electronic controls. ...
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2answers
984 views

Cirrus Logic Audio card replacement for recording

As is probably well known the Cirrus Logic Audio Card has stopped being manufactured and as such is proving very difficult to get. My reasons for wanting this card was that I needed something with a ...
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1answer
3k views

Configure ALSA Sound card

I have 2 playback device where one is HDMI and the other is HAT sound card. The requirement is to play audio from card 0 or 1 without rebooting the system. aplay -l **** List of PLAYBACK Hardware ...
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1answer
2k views

arecord throw Input/Output error

When trying to run the following command, I am getting Input/Output error pi@raspberrypi:~ $ sudo arecord -Dhw:1,0 -d 10 -f cd -t wav test.wav Recording WAVE 'test.wav' : Signed 16 bit Little Endian,...
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1answer
2k views

How to use a GPIO pin after I put on a HAT?

I got a Speaker pHAT for my Pi Zero. According to the pinout, it only uses 5 GPIO pins, so plenty of room to add something else. The problem is, I'm not sure what's the best way to physically attach ...
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1answer
378 views

Pi 3 can't detect servo hat

Super new to this. Attached the Adafruit 16-Channel PWM / Servo HAT for Raspberry Pi to my Pi 3. All solder connections look good. Booted up the Pi, ran through the tutorial. After tutorial, the hat ...
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2answers
1k views

How to approximate room temperature in a better way

I've just bought an Enviro pHAT. The temperature sensor on my pHAT reads around 31 degrees Celsius for my room This sensor is close to the Pi, so it also gets a heatwave from the CPU Is there a ...
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0answers
62 views

Raspberry Pi abruptly “dies” when I apply physical pressure

I have been using my Pi B2 since 2015. I recently got a Sense Hat, but it behaves extremely weirdly when I use it. For example, I used the mini joystick, which applied slight pressure to my Pi. Then,...
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1answer
700 views

pHAT DAC 3.5mm solder pins

Like many others, I have been working on a handheld gaming system using a Raspberry Pi Zero. One of the downsides of doing this, however, is that it has no sound built in, other than through the HDMI ...
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1answer
182 views

Finding EEPROMS suitable for HATs

I'm working through the HAT design guide to work out what kind of EEPROMs I can use. To quote it: 24Cxx type 3.3V I2C EEPROM must be used (some types are 5V only, do not use these). The EEPROM must ...
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2answers
492 views

Raspberry pi HAT device-tree

I'm currently developping a Raspberry pi HAT. The Raspberry pi HAT must contain a EEPROM with several information in it. This information will be read at boot time in order to configure the Raspberry ...
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1answer
171 views

Raspberry pi HAT id Vendor id Product origin

I'm currently developing a Raspberry pi HAT which I will eventually sell in the future. According to the official documentation the EEPROM memory of the HAT must contain several information. Two of ...
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1answer
1k views

EEPROM Raspberry pi HAT read

I'm currently designing a Raspberry pi HAT. A HAT need to have an eeprom memory on it with several information. This memory is read at boot time of the Raspberry pi. My question is the following: ...
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0answers
251 views

Hat making I2C unusable

I bought this Pi hat for integrating an Arduino with the Pi and exposing all the GPIO pins through nice GVS headers, and overall I'm very happy with it. However, I'm noticing a weird problem. Without ...
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2answers
358 views

Simultaneously use a HAT and breakout on a Raspberry Pi 2

I'm starting a project for an internet-controlled model vehicle. I have a Raspberry Pi 2 Model B to serve as the core. I have been researching the components I need and the main 2 that have stood out ...
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0answers
208 views

Powering RPi3, 3G Dongle, DC Motor HAT and DC Motors

I've got a setup where I power RPi, 3G dongle from one power source (USB Hub powered from 5V 2A) and a DC Motor HAT and DC Motors (2 small car mirror motors) from a 12V 2A supply. I checked the motors ...
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4answers
1k views

Hat for shutting down the Pi with a button

Are there any Raspberry Pi hats which allow to shut down the Pi by pressing a button ? Are there any DIY open hardware projects which describe step-by-step how to build such a hat ?
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1answer
291 views

Disabling Hat EEPROM scan

How do I free the Hat EEPROM I2C bus (bus 0?) on a + model? I ask because the primary bus is blocked by an TFT I'm using, and I want to solder nothing to the Pi GPIO.
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2answers
4k views

Why does the Sense Hat / Astro Pi show the wrong temperature and humidity?

I recently bought the sense-hat, previously called astro-pi. Unfortunately the temperature shows 28 to 31 degrees Celsius from both temperature sensors on the board. They often show around 30 degrees ...
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2answers
296 views

sense hat sample “snake” returns “event device not found” error

My "sense hat" sits ontop of a raspberry pi 3. I've completed the installation instructions found at https://www.raspberrypi.org/documentation/hardware/sense-hat/ lexu:~> sudo apt-get update lexu:~...
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1answer
81 views

Can I use a DHT22 sensor with the servo hat installed on my RPi-3?

the title pretty much says it all... My son an I are doing some robotics experimenting with the RPi-2 and RPi-3, we are using the Servo Hat to control several servos on them. We would like to ...
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2answers
620 views

Raspberry Pi Sense HAT on Rpi 3?

I have a question to ask you guys. Can I use the Raspberry Pi Sense HAT (the one used in Astro Pi) with the Raspberry Pi 3 without having any kind of problems? Thanks in advance!
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2answers
2k views

How to detect what kind of HAT or GPIO board is plugged in - if any?

I am setting up some Raspberry Pis for use in demos to colleagues, in order to show off capabilities of the Pi itself, and of some of the add-on boards that are available. I would really like to be ...