vault backup: 2026-06-28 20:03:06

PCB Design/Music Player/Process.md

@@ -55,3 +55,5 @@ I chose [this mosfet](https://www.digikey.com/en/products/detail/infineon-techno
 There are a few considerations needed for effectively routing USB. The first is inline resistors for the data lines. Based on the hardware design guidelines $22\Omega$ resistors were chosen. The hardware design guidelines also suggest adding footprints for capacitors to ground on the data lines which were also added. These can be populated later to help match impedance although they will likely not be needed.
 ## MicroSD Card
 There are two different modes that can be used to read and write data to the microSD card, SPI and SD-MMC. SPI is simpler but SD-MMC can get faster speeds and is supported by the ESP32-S3 so that is what I will be using. the ESP32-S3 can multiplex this functionality to any of the GPIO pins so the pinout of the microcontroller is not important. 10K pullup resistors are also needed on the CMD and data lines for the micro SD card to ensure that they do not enter an undefined state. I have also included a 10K pullup resistor on the card detect pin so that it is easier for the microcontroller to read and the in is in a defined state when there is no card in the slot (the pin is pulled to ground when there is a card inserted).
+## Control Scheme
+This device will not have a touchscreen (the display doesn't have one and I don't want to use one) so I will be controlling everything with physical buttons