Homebrew tiny pi clone

[doro44]

Hi guys,

another homebrew project - a tiny pi clone
I designed the board by my self, the board is singlesided for easy home etching. I did use slightly bigger display 1.8" 128x160 px and bigger directional button.

IMG_0510.JPG (114.14 KiB) Viewed 11041 times

IMG_0511.JPG (133.61 KiB) Viewed 11041 times

and here is the bare pcb:

IMG_0512.JPG (128.68 KiB) Viewed 11041 times

If someone would be interested I can share the PCB design and list of components used (all aliexpress)...

[klotzii]

Yeah, I´m interested!
Please share your parts list and the PCB files!

[doro44]

I ll just put here everything:

display: https://www.aliexpress.com/item/1pcs-1- ... 4c4dDehBMr
Joystick: https://www.aliexpress.com/item/5-pcs-5 ... 4c4dUIH3yl
Big buttons: https://www.aliexpress.com/item/20PCS-L ... 4c4dUIH3yl
Small buttons: https://www.aliexpress.com/item/100PCS- ... autifyAB=0
Switch: https://www.aliexpress.com/item/50Pcs-M ... autifyAB=0
Power: I have taken out of the mini powerbank that was powered by single 18650 cell
Battery: similar to this: https://www.aliexpress.com/item/Gaoneng ... autifyAB=0

I have created the PCB in easyeda online, and you can download the cb here: http://dorica.sk/downloads/
Just download, change the extension to json and load to easyeda...

For display, I am using fbtft st7735r driver, just enable dtparam=spi-on in config.txt, follow standard procedure to install fbtft and add add following line to your fbtft.conf file:
options fbtft_device custom name=fb_st7735r gpios=reset:25,dc:24 speed=16000000 width=128 height=160 rotate=0 bgr=0 fps=60

For buttons, I have used this guide: https://sudomod.com/forum/viewtopic.php?t=57

[angelgrant]

I'm interested in it! Great thing

[epicpwn]

Nice work! Any videos of this in action?

[moosepr]

nicely done!! You might be able to get that speed value up a bit to help make the screen run faster. try this

speed=40000000

[doro44]

I need to mention one thing - it appears I did use too big resitor (150 ohm) for the display backlight. I am going to try lower resitance to make sure the backlight is not so dim:

IMG_0516.JPG (94.32 KiB) Viewed 10962 times

I am going to try to put one more in paralel, it should lower the resitance to half.

[doro44]

Also, what retropie theme would you guys recommend for this small screen?

[Helder]

Use a 3.6ohm resistor for proper backlight voltage.

[Gizard]

When I click the link on your website to download your PCB, I just get a very long line of code.