Document MicroSD card requirements #246

h5/README.md

@@ -51,7 +51,7 @@ NOTE: throughout the assembly make sure to avoid static electricity accumulation
 5. Solder 15 terminals to the PCB while everything is positioned in the case.
 6. Remove screen back cover. Attach the included 4-lead wire to the screen and to the PCB - each `RX` should be attached to `TX` on the other side.
 7. Bolt the case and screen together using the bolts that used to hold the back cover.
-8. Prepare MicroSD card with [h5.tft](screen/h5.tft), insert into the screen. Connect 5V power supply to the POWER terminal, wait for screen to report that flashing has finished. Disconnect the power, remove the card.
+8. Use empty MicroSD card 32 GB or smaller formatted as FAT32. Copy [h5.tft](screen/h5.tft) to the card, insert into the screen. Connect 5V power supply to the POWER terminal, wait for screen to report that flashing has finished. Disconnect the power, remove the card.
 9. Cut the keyboard cord to the suitable length, find which color corresponds to which line in your particular keyboard [using the port pinout](https://en.wikipedia.org/wiki/PS/2_port) and multimeter continuity tester.
 10. Supply up to 2A of power to the `POWER` terminal. You can flash the ESP32 via the USB but 0.5A provided by standard USB is not enough to start the screen.