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License: Other
Jalapeno BLE - A 40% staggered bluetooth keyboard
License: Other
Breakout all the ISP pins on the atmega32U4 to a 6 pin header
Re-route the pcb after 0.0.2 milestone changes
Review requirements for adding led's to each switch
Replace the 22kohm resistors on the D+ & D- traces with 22ohm ones
Add a 10k pulldown (to gnd) resistor on the atmega32U4's HW2 pin (pin 33)
Find an alternative to the SS (8) pin on the atmega32U4 as it's used for ISP func
Add an led to the mode pin of the MDBT40
gnd <=> led- <=> led+ <=> 2.2kohm resistor <=> MDBT40 pin 38 (P0.18)
Breakout
on the MDBT40 in a 6 pin programmer interface
Add a 10k pullup (to vss) resistor on the atmega32U4's RESET pin (pin 13)
Just throw one of these closest to usb port for esd prot
https://lcsc.com/product-detail/Diodes-ESD_Nexperia_PRTR5V0U2X-215_PRTR5V0U2X-215_C12333.html
Then tack on a 500ma hold 1a trip polyfuse after the esd chip and the board is protected against most things
So the chain order goes USB -> esd prot chip -> ptc fuse -> mcu cluster
(for vcc)
If there's a static discharge, the esd chip handles it first before blowing up anything else
If there's a substantial overcurrent that isn't enough to trip the esd protection, the ptc fuse kicks in
Replace the USB mini connector with a newer USB c connector
Breakout the dfu pad on the mdbt40 to a pad next to a gnd pad, with a warning on the silkscreen
Before connecting the WS2812 to a power source, connect a big capacitor from power to ground. A cap between 100µF and 1000µF should be good.
Just like the WS2812 breakout boards, we recommend adding a 0.1 μF capacitor between each WS2812 LED's VDD and GND.
https://learn.sparkfun.com/tutorials/ws2812-breakout-hookup-guide
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