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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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Network Hats for Raspberry Pi 3

I am trying to be able to connect Raspberry Pi 3 to two networks at the same time through Ethernet. Unfortunately it has only one Ethernet port available. The solution so far is to buy a network hat ...
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Unable to get accurate RPM with Adafruit Stepper Motor HAT v0.1

I'm trying to drive some stepper motors using a Raspberry Pi 3 B V1.2 and an Adafruit Stepper Motor HAT v0.1 and am having trouble setting them to the speed I want. The motors have a step angle of 1.8 ...
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How best to power a motor hat asking for 6-12V for just two DC motors

I purchased a Waveshare Motor Hat because it has the nice Pi Zero size, extra long headers, and already has headers and blocks soldered, all for less than $13. https://www.waveshare.com/motor-driver-...
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I'm curious: has anyone build a HAT and sold it commercially? Looking for experiences [closed]

Has anyone build a HAT and sold it commercially? Looking for experiences on how to the production and distribution is. Has anyone ideas on how to promote a HAT when you built it? I find there is ...
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Analog input together with LoRaWAN

I am looking for a hardware configuration enabling me to read an analog input from ammeter and collect the historical data and send them over LoRa to a server. So I could use something like Monarco ...
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1answer
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HAT Compatability RPI A,B and B+

I'm working through the HAT specification. The raspberry PI A and B have a 26 and GPIO headers, while B+ has 40 pin GPIO. https://github.com/raspberrypi/hats Am I correct to reason that if I design ...
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110 views

How to make ups hat run safe shutdown on raspberry when disconnected from the power source

It can be long discussion, because there is no single solution around this, so, to cut the story short, I will tell where I stuck on my way. It is AndroidAuto (media centre in car on raspi) project I'...
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38 views

Raspberry Pi 3 Prototyping Breadboard HAT

How do I get the pin connect on the board. I see how to plug it on top of my raspberry pi through the female pin connected that is attached to the hat. But how do I connect the raspberry pins to the ...
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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 ...
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168 views

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

I have this HAT i bought for a pi project I am working on. I get the device to power on, I can connect via USB from PC, and can connect from pi too. However, the NET LED just blinks every second, ...
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1answer
93 views

Stepper Motor Hat v0.1 - pre-soldered version

I am pretty new and have installed the referenced HAT. I followed the instructions, but it is not detected. I have power and a green LED on the board and when I turn it on and off the servos jump a ...
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3.5in TFT screen hat and Raspberry Pi 3+b

I'm trying to understand something about the MPI3508 screen I purchased (https://www.amazon.ca/dp/B07DQKQG6X). I tried powering it via usb and connected a PC in its HDMI input and got it working (the ...
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142 views

Problem with HAT GSM/GPRS/GNSS/Bluetooth

I have: Connected rasspbery pi zero with HAT GSM/GPRS/GNSS/Bluetooth by gold-pins. List item Switched UART to B-position Raspbian version: 9 (stretch) When I used pwdrkey i have only PWR and STA ...
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501 views

GPIO relay signal cross turns to all relays staying on after Darlington added

I have 4 Sunfounder 2 channel relays 7 of which that I'm using to control some things on my aquarium. I suspect that I may have wired them up wrong somehow though. The behavior I'm seeing is as ...
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77 views

How to turn multiple servos by an angle using the Adafruit servo/pwm pi hat?

So I'm using a Raspberry Pi Model 3b and an Adafruit 12-bit PWM Servo/PWM Pi Hat on my project to control 6 independent continuous servos. I'd like to send in signals that would turn the servo by that ...
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ADC Hat with 8 differential channels and 24 bit resolution for 100 - 200 SPS (Hz)

I'm sorry if there's a similar post, I could not find it (them). As the title implies, I'm looking for an ADC hat for the Rapspberry Pi 3 Model B with 8 differential channels to sample up to 200 SPS (...
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1answer
63 views

Supply 5v to peripheral using solder pads and not GPIO?

This seems like a simple enough question but it hasn't been easy to find an answer! I have a Pi3 (with recommended PSU), official screen, official camera and I've now added the respeaker 2-mics Pi ...
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239 views

Raspberry Pi Cluster using Pi Zeros and Pi 3's

In my previous post i discussed using Pi3s for a cluster, and received some answers and good links to further my understanding of distributed computing. I also received advice to cluster Pi3+'s ...
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111 views

Pimoroni Speaker Phat i2c and using the pins

Is it possible to use the pins on top of a raspberry pi hat that uses i2c? I am trying to use the Pimoroni Speaker Phat and control a motor using GPIO at the same time. Thanks for any replies.
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160 views

Do i need more gpio pins?

Newbie here, I'm sorry if its a stupid question. I have a project in which I need both touch input and LED output on my Raspberry Pi zero w. The LED output (Neopixels) will need the 5V, the GPIO18 ...
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Is it possible to have a correct sound using iQAudio PI-DAC+ and Volumio?

I have bought the excellent Pi-DAC+ to use it with Volumio in an old radio I have. In this radio, the speakers are marked as 6 ohms impedance. This radio used to provide a rather good sound. But with ...
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661 views

Establishing how to power on a HAT using GPIO

I have a combined GSM/GPS HAT and a Pi Zero. I can turn on the HAT manually using the power button, but would like it to power on at boot via /etc/rc.local. I can do something along the lines of this, ...
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No response from RFID HAT

Model: Raspberry Pi 3 Model B Vi.2 HAT: RaspberryPi-B1 v1.3 I just bought RaspberryPi Hat RFID/NFC board (RaspberryPi-B1 from ib technology). I've spent all day trying to get a response from it, but ...
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Has anyone tried connecting a adafruit hat board and an LCD Screen?

We use the Raspberry Pi 3 boards for an elementary school robotics program. We saw these cool Kuman 3.5" touch screens that said they were HDMI (which I assumed meant they connected directly into the ...
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314 views

Same lipo power source for raspberry pi and motor hat

I am building a rover and would like to power the Raspberry Pi and the Motor HAT with the same power source. I want to use a 2500 mAh LiPo battery for a long play time. My DC motors work at 6V-9V. ...
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1answer
504 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
307 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
802 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
2k 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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Unicorn Hat excessive spazzing

My unicorn hat has been acting up lately.. but its always worked before. Whenever I try to run one of the example scripts, the lights flash extremely fast and in a non-coherent fashion - but they all ...
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1answer
1k 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
309 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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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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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
594 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
109 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
393 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
152 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
786 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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219 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
316 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
199 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
810 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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236 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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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
269 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
74 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
605 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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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 ...