Sunday, 20 December 2015

Day 20 - ZX Spectrum Pi Zero Revised

This is day 20 of the Advent Calendar of USB keyboards. Today, another ZX Spectrum Pi Zero, this time, the buyer asked, could they have access to the microSD card without opening the case?
Certainly, it now sits in the opening between the MIC and EAR sockets.
And still have USB and 9 way D joystick? Yes, no problem.
To do this, it was a case of rotating the Raspberry Pi Zero. This microSD socket isn't as nice as the usual one on the Raspberry Pi, it doesn't click and latch, but you can slide it in and out.
The wiring inside is revised slightly as the HDMI socket was in the way of the microUSB connectors.
The USB hub is now wired direct to 5V from the DC-DC board - I designed that with two 5V outputs for this configuration.
The 5V in and the USB D+ and D- are wired direct to the pads on the bottom of the Pi Zero.
As before, the two internal USB ports are for the USB keyboard on the lid and the USB joystick. Two USB ports are available externally.

I will be adding this as an option to the ZX Spectrum USB keyboard with Pi in my Etsy store, if you wish to order this version now, just let me know in the order comments.

Tune in tomorrow to open another window on the Advent Calendar of USB keyboards.