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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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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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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0answers
87 views

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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41 views

Are HATs not supposed to be stackable?

From reading the HAT spec, the ID EEPROM is fixed at address 0x50. This implies that only one real hat may be present at a time, yet lots of products are called HATs and say that they can be stacked, ...
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2answers
284 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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0answers
74 views

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 ...
1
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1answer
105 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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0answers
64 views

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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0answers
218 views

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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2answers
928 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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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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0answers
241 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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0answers
207 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 ...
1
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1answer
65 views

Sixfab LTE IOT HAT throwing continuous AT Command

I was working on getting my new Raspberry Pi HAT that I have received and tried the simple example just to see if it is working fine. I have not been able to send a text message to my mobile phone. I ...
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60 views

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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0answers
21 views

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
240 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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0answers
96 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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0answers
72 views

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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0answers
145 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.
0
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1answer
158 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
282 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
78 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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1answer
263 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.