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Changelog

REV C

🔧 ADC & Analog Front-End

Switched back to ADS1115 ADC.
Removed the ADC VREF circuit and added a solder jumper for VREF selection.
Standardized all analog scaling to 2.048 V reference (instead of 3.3 V).
Added voltage dividers for 30 V and 5 V input ranges.
Set 4–20 mA shunt resistor to 100 Ω.
Added pull-up resistors on ADS1115 ALERT pin.

⚡ Power & Regulation

Added a buck converter on the EXT port for 12/24 V → 5 V to power the ESP32.
- Includes a jumper to enable/disable EXT-port power.
- EXT port may now be used as power-only, reference-only, or both.
Added 3.3 V ↔ 5.0 V buffer for WS2818 LED.
Switched to green LEDs for power indication.
Removed the USB-to-serial and USB hub for a simplified ESP32-S3 design.

🧩 Connectors & I/O

Added QWIIC header.
Moved pluggable terminal blocks down 0.5 mm.
Removed jumper for EXT power selection.

🧪 Test Points

Added test points for 3.3 V, 5.0 V, 24 V, GND, SDA, SCL, and others.
Standardized all test points to 1.5×0.7 mm.

🔊 Piezo & Indicators

Switched to passive piezo and added diode (Huaneng QMB-09B-03).

🧱 Mechanical & Layout

Changed upper mounting holes to SMTSO3080CTJ hardware.
Switched to SMT boot/reset buttons.
Removed RTC clock crystal.
Switched boost converter to MT3608B for 24 V generation.