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pimoroni / hyperpixel

Setup for the Pimoroni Hyper Pixel 800x480 pixel multi-touch display
https://shop.pimoroni.com/products/hyperpixel
MIT License
96 stars 29 forks source link

Feature request - document how to add i2c physical buttons #10

Closed PalimPalimPalim closed 5 years ago

PalimPalimPalim commented 7 years ago

Add some example code on how to add 2 to 3 physicals buttons via i2c.

Gadgetoid commented 7 years ago

If size isn't a constraint, the easier thing to do is use a Picade PCB.

Or something like: https://shop.pimoroni.com/products/adafruit-ft232h-breakout-general-purpose-usb-to-gpio-spi-i2c

Or any generic i2c IO expander. A common and well-documented hobbyist part is the MCP23017.

And USB-compatible Arduino (Leonardo-style) or micro dev board would also work, via USB serial or HID joystick/keyboard emulation, to add buttons.

I'll see what I can get written up regarding these solutions, or perhaps beg @sandyjmacdonald for another epic tutorial ;)

Bauingenieur commented 7 years ago

Hi I'm new here! As i read it right, there is no possibility to plug in an expander or replicator for using HyperPixel and an DAC HAT?

steffenmllr commented 7 years ago

I was just running into the same Problem. I couldn't find a i2c IO Expander on pimoroni so I bought this one: https://www.abelectronics.co.uk/p/71/IO-Pi-Zero

Any help setting it up with my hyperpixel and raspberry zero would be appreciated - seems like a lot of people are interested in that topic

eighthree commented 6 years ago

I attached usb hub to use with my hyperpixel and went the micro dev board route via USB serial.

I have written an example arduino sketch that uses a feather m0 express as a USB HID device for my retropie build.

https://gist.github.com/eighthree/408075d4888b1bd3cc4652b2ed952e78 https://gist.github.com/eighthree/cc8c640cb6b0898cfc6d7130f8ae3f4d

TLDR; Any usb HID keyboard compatible micro controller should work for inputs like keyboard/mouse/gamepad.

For other things I'm using a python script that listens in to the serial port the MCU is connected to and have the board send info like charging state, battery voltage via serial. (eg use case. a battery indicator on a retropie build).

ismangil commented 6 years ago

I found this as well https://shop.pimoroni.com/products/adafruit-atsamd09-breakout-with-seesaw to get back expansion capabilities with HyperPixel, to be connected to the Touch I2C bus 3.

https://learn.adafruit.com/adafruit-seesaw-atsamd09-breakout?view=all

ferazambuja commented 6 years ago

The way a pi zero is affordable it might easy to use it as GPIO expander: https://www.raspberrypi.org/magpi/pi-zero-gpio-expander/

If anyone has tried let me know.