So today i wired the rest of the schematic !

I wired the entire audio sheet - including the mic, speakers, and audio jack : This includes the signal amplifier, the encoder, one stereo speaker, microphone, and also a headphone 3mm audio jack that unfortunately still plays stereo sound.
If you don’t no what the difference between stereo and audio sound is, stereo is : stereo is basically built for one type of audio (a single speaker), while stereo is designed for two sides, with both sides playing a bit differently

after that i started wiring the display (which i decided will also have touch) AND SD card slot - because they actually can come together as one module. cause i could’nt find a symbol for this special component, i just used a Pin connector each for both sides.

Next was the easiest, and probably most satisfying part : The keyboard matrix
The main goal with the Keyboard Matrix was to make it

• as compact and small as possible
• good looking
• low profile
• not too hard to type on
• use a small amount of GPIO pins

in the end, i was able to do all this by using this switch matrix scanner chip called the TCA8418RTWR that takes over all the keyboard matrix scanning :

In the End i decided to use a 32-Key layout with 4 rows and 8 coloumns :

Then came the last (and most fun) part - the Peripherals

I decided i wanted some fun stuff like:

• a 5-way nav switch (that is incorporated in the switch matrix to save GPIO pins)

• a tilt and movement sensor (accelerometer & barometer 2 in 1)

• headers so i can connect other components - i exposed 5 GPIO pins, I2C/Grove for OLEDs and sensors and stuff, and basic Power (3V, 5V, GND, direct battery)

I had wanted to add a rotary encoder, but my GPIO pins ended up occupied and i did not wanna get rid of the GPIO header just for this - also i feel like i uee keyboard shortcuts for everything anyway
next up is footprint assignment and then pcb design, but im rather worried about the footprint for my display + sd module
the problem is, this module has both touch, display, and an sd card, and i cannot find a footprint for that - i could find some that have only diplay and touch, but no SD, or display and SD, but touch unused -
because of this issue, i will just use 2 connectors that are just approx. where the connectors on the module are, and either

1. submit the design files with the approximate measurement, then order the component, buy it, measure where the connector should go, and then adjust my PCB design
   or
2. plug in only one side and use a cable for the other side.