Silly banana for scale PCB ruler, with functions

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Main components

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Part NumberDescription
NE555DPrecision Timers, 555 compatible, SOIC-8
ATmega1280-16A
CH340G
ATmega328-A
ESP32-C3-WROOM-02ESP32-C3-WROOM-02 is a general-purpose Wi-Fi and Bluetooth LE module. This module features a rich set of peripherals and high performance, which makes it an ideal choice for smart home, industrial automation, health care, consumer electronics, etc.
ESP32-S3-WROOM-1RF Module, ESP32-S3 SoC, Wi-Fi 802.11b/g/n, Bluetooth, BLE, 32-bit, 3.3V, onboard antenna, SMD
AMS1117-3.3
SOT89
DPAK
D2PAK

musa schematic

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musa board layout