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Hello Alexey, I was looking at your project and wondered if I could make it even smaller or lighter. I found STM32L011F4U6 which is a 3x3 UFQFPN-20 package. However, I'm not sure if it has enough flash, RAM, and timers for an easy port.
I also found W25Q256JWPIQ which is 32 MB in the same 5x6 package, but we would have to drop the circuit to 1.8 Volts. I believe the STM MCU can do it, but I'm not sure if 1.8 Volts is fine for the UART.
Finally I was thinking of changing the push switch to TS-1928-B, which is very small and light.
What do you think? Thank you for your excellent project!
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