# Compulsory Yellow KITT ## Description 5V Wi-Fi/BLE Humidity Sensor with ESP32-WROOM-32, SHTC3, and AP63203WU-7 Buck Regulator ## Project Details - **Owner:** oozliuoo - **Created:** 10/6/2025 - **Last Updated:** 10/6/2025 - **Visibility:** Public - **System Architecture:** ```mermaid graph LR P5V["5V Input"] --> LDO["3.3V LDO Regulator"] LDO --> ESP["ESP32-WROOM-32"] LDO --> SHTC3["SHTC3 Sensor"] ESP -->|I2C| SHTC3 ESP -->|Wi-Fi/BLE| Cloud["Cloud Backend"] ``` ## Key Components ### J1 — [PJ-037A](https://www.flux.ai/vasy_skral/pj-037a~6cq.md) - Role Details: 2.1 mm barrel power jack for 5V input - Role: Interface - Footprint: CUI_PJ-037A - Manufacturer Name: CUI Devices - Part Type: Connector - Datasheet URL: https://www.cuidevices.com/product/resource/pj-037a.pdf - Manufacturer Part Number: PJ-037A **Pins:** - Center pin [pin 1] - Terminal [pin 2] ### U1 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d~7py.md) - Part Type: Microcontroller - Manufacturer Name: Espressif - Role: Main MCU - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Footprint: Espressif_ESP32-WROOM-32 - Role Details: Wi-Fi/Bluetooth microcontroller - Manufacturer Part Number: ESP32-WROOM-32 **Pins:** - 3.3V [pin 2] - AGND [pin 39] - CLK [pin 20] - CMD [pin 19] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0 [pin 34] - SD0 [pin 21] - SD1 [pin 22] - SD2 [pin 17] - SD3 [pin 18] - TXD0 [pin 35] - VN [pin 5] - VP [pin 4] ### U2 — [SHTC3-TR-2.5KS](https://www.flux.ai/adrian95/shtc3-tr-2p5ks~af.md) - Manufacturer Part Number: SHTC3-TR-2.5KS - Role: Sensing (Shunt) - Manufacturer Name: Sensirion AG - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/906/HT_DS_SHTC3_D1.pdf - Footprint: Sensirion_SHTC3-TR-2.5KS - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Sensor - Role Details: I2C humidity & temperature sensor **Pins:** - EPAD [pin 5] - SCL [pin 2] - SDA [pin 3] - VDD [pin 1] - VSS [pin 4] ### U3 — [AP63203WU-7](https://www.flux.ai/adrian95/ap63203wu-7~o8a.md) - Manufacturer Part Number: AP63203WU-7 - Role: Power Conversion - License: https://creativecommons.org/licenses/by/4.0/ - Footprint: Diodes_Incorporated_AP63203WU-7 - Manufacturer Name: Diodes Incorporated - Role Details: 5 V to 3.3 V buck regulator - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP63200-AP63201-AP63203-AP63205.pdf - Part Type: Integrated Circuit **Pins:** - BST [pin 6] - EN [pin 2] - FB [pin 1] - GND [pin 4] - SW [pin 5] - VIN [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/oozliuoo/compulsory-yellow-kitt~cz](https://www.flux.ai/oozliuoo/compulsory-yellow-kitt~cz).* --- *Generated from [https://www.flux.ai/oozliuoo/compulsory-yellow-kitt~cz](https://www.flux.ai/oozliuoo/compulsory-yellow-kitt~cz)*