Lemon Wired Microcontroller (v0.4): Discount for Solder Residue

When soldering the flash chips onto my Lemon Microcontrollers, I left flux and solder residue near the flash chips on a few boards. You can see it in the picture.

All of these microcontrollers have been tested to verify all the pins and program work and will receive the same amount of support from me. The only difference is the residue.

Read more on the Lemon Microcontrollers homepage.

I took everything you could possibly want in your wired microcontroller and stuck it on a PCB to make something seriously overpowered:

• An RP2040 microcontroller with 8 MB flash memory
• FPC Connectors to connect Pumpkin Flex PCBs or TheBigSkree's fully flexible PCBs
• A VIK connector for connecting VIK-compatible trackballs and displays (or to use with my VIK breakout)
• Through hole pads for alternatively soldering connections to your keys or accessories
• Onboard RGB LED
• Level shifting to drive LEDs at 5V
• Shift register to drive column pins, giving you 23 total I/Os (of which 7 are output only) for connecting keys and peripherals
• Supports firmware autogen in Cosmos

If you're using the Lemon with a trackball or display that doesn't have a VIK connector, you can use the VIK breakout board I sell to add one right next to the peripheral and a 12p 0.5mm FPC cable to neatly connect to the microcontroller.