# Architectural Lavender Translation Collar ## Description Architectural Lavender Translation Collar – ESP32‑S3 Wi‑Fi + LoRa, USB‑C, Li‑ion, low‑power design Overview Experience a cutting-edge IoT solution with this low‑power board built around the ESP32‑S3‑MINI‑1‑N8. Designed for seamless Wi‑Fi (2.4 GHz), BLE, and LoRa (868 MHz) connectivity, this board integrates ENS161 and ENS210 sensors over I2C alongside an RFM95W‑868 LoRa radio on SPI. It is powered via a 3.7 V Li‑ion cell with USB‑C charging up to 500 mA, complete with full battery protection, a robust 3.3 V rail tailored for Wi‑Fi burst currents, and per‑peripheral power gating to enhance energy efficiency. Core Features • MCU: ESP32‑S3‑MINI‑1‑N8 equipped with an onboard PCB antenna for 2.4 GHz Wi‑Fi/BLE, ensuring optimal wireless performance. • Sensors: Integrated ENS161 and ENS210 sensors utilize a shared I2C bus with controllable 4.7 kΩ pull‑ups for streamlined communication. • LoRa Radio: The RFM95W‑868 module, connected via SPI, enables long‑range communication at 868 MHz. Power & USB‑C Connectivity • Battery: A reliable 3.7 V 1200 mAh Li‑ion battery connected via a right‑angle JST‑PH 2‑pin connector features built‑in battery protection. • Charging: The USB‑C receptacle, with CC resistors and TVS protection on D+/D− along with series resistors, supports fast, safe charging with a current limit of 500 mA. • Regulation: A dedicated 3.3 V regulator capable of handling Wi‑Fi burst currents coupled with bulk and high‑frequency decoupling ensures stable operation, supported by status LEDs indicating power and charge states. Low‑Power Control • Peripheral Management: Load switches allow selective power‑gating of the ENS161, ENS210, and RFM95W modules, controlled directly by ESP32‑S3 GPIOs. • Energy Efficiency: Controllable I2C pull‑ups minimize idle current, vital for prolonged battery life in IoT applications. RF and Antenna Integration • 2.4 GHz: Utilizes the integrated PCB antenna on the ESP32‑S3 with proper ground/metal keep‑out zones for optimal signal integrity. • 868 MHz: Features a controlled‑impedance feed from the RFM95W to a PI matching network (C‑L‑C pads) with flexible antenna options—selectable via SMA connector, chip antenna, or PCB trace—and includes RF ESD protection. Connectivity & Debug Features • USB‑C Interface: Provides secure data connectivity with integrated safeguards and proper terminations. • Debugging: A comprehensive programming/debug header exposes EN, BOOT, and UART lines, with test points on key rails and buses (3V3, VBAT, SCK, MOSI, MISO, SDA, SCL, RESET/EN, GND) to simplify development and troubleshooting. Design Verification • Rigorous ERC/DRC and decoupling checks ensure adherence to component ratings and optimal signal routing. • Maintain RF keep‑outs and impedance‑controlled traces for both 2.4 GHz and 868 MHz paths, securing reliable performance even during high‑intensity operations. #IoT #ESP32S3 #LoRa #LowPowerDesign #USB-C #WirelessConnectivity #BatteryPowered #RFDesign ## Project Details - **Owner:** neilc1964 - **Created:** 1/31/2026 - **Last Updated:** 2/1/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-2P6](https://www.flux.ai/vasy_skral/usblc6-2p6~7ur.md) - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: USBLC6-2P6 - Footprint: SOT-666 - Part Type: Protection - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750.pdf/files/CD00050750.pdf/jcr:content/translations/en.CD00050750.pdf - Role: Protection **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 4] - I/O2 [pin 3] - VBUS [pin 5] ### D2 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102~vb9.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Role Details: ESD protection for USB-C D+ and D- data lines (low capacitance) - Package or Case Code: SOT-23-6 - Manufacturer Name: Texas Instruments Inc. - Role: Protection - Manufacturer Part Number: WE-TVS-82400102 **Pins:** - ~ [pin 1] - ~ [pin 3] - ~ [pin 4] - ~ [pin 5] - ~ [pin 6] - ~ [pin 2] ### D3 — [5.5v tvs diode PESD5V0X1BCSF](https://www.flux.ai/georgemars/5p5v-tvs-diode-pesd5v0x1bcsf~l1.md) - Manufacturer Part Number: RELAY_PESD5V0X1BCSF - Ratio: 0.5:1 - Manufacturer Name: Nexperia USA Inc. - Datasheet URL-: https://assets.nexperia.com/documents/data-sheet/PESD5V0X1BCSF.pdf - Role: Protection - Role Details: ESD protection for USB-C VBUS power line (low capacitance) **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [USB4105-GF-A-120](https://www.flux.ai/adrian95/usb4105-gf-a-120~hy.md) - Package: GCT_USB4105-GF-A-120 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: GCT - Package or Case Code: GCT_USB4105-GF-A-120 - Part Type: USB C - Manufacturer Part Number: USB4105-GF-A-120 - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Role Details: USB-C receptacle for USB-C power and data, right-angle SMT with TH tabs - Role: Connector **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J2 — [USB-C 2.0 Receptacle](https://www.flux.ai/corynrobinson/usb-c-20-receptacle~cf.md) - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf - Manufacturer Part Number: USB4105-GF-A - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 - Manufacturer Name: GTC - Part Type: USB C **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 9] - D- [pin 7] - D+ [pin 10] - D+ [pin 8] - GND [pin 15] - GND [pin 1] - GND [pin 16] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 14] - VBUS [pin 13] - VBUS [pin 4] - VBUS [pin 3] ### U1 — [ESP32-S3-MINI-1-N8](https://www.flux.ai/lcsc/esp32-s3-mini-1-n8~hi03.md) - Part Type: WiFi Modules - Manufacturer Name: ESPRESSIF(乐鑫) - LCSC Part Number: C2913206 - Manufacturer Part Number: ESP32-S3-MINI-1-N8 - Package or Case Code: BULETM-SMD_ESP32-S3-MINI-1-N8 **Pins:** - 3V3 [pin 3] - EN [pin 45] - GND [pin 42] - GND [pin 58] - GND [pin 47] - GND [pin 2] - GND [pin 53] - GND [pin 55] - GND [pin 1] - GND [pin 60] - GND [pin 49] - GND [pin 56] - GND [pin 52] - GND [pin 48] - GND [pin 51] - GND [pin 57] - GND [pin 54] - GND [pin 59] - GND [pin 43] - GND [pin GND] - GND [pin 46] - GND [pin 50] - IO0 [pin 4] - IO1 [pin 5] - IO10 [pin 14] - IO11 [pin 15] - IO12 [pin 16] - IO13 [pin 17] - IO14 [pin 18] - IO15 [pin 19] - IO16 [pin 20] - IO17 [pin 21] - IO18 [pin 22] - IO19 [pin 23] - IO2 [pin 6] - IO20 [pin 24] - IO21 [pin 25] - IO26 [pin 26] - IO3 [pin 7] - IO33 [pin 28] - IO34 [pin 29] - IO35 [pin 31] - IO36 [pin 32] - IO37 [pin 33] - IO38 [pin 34] - IO39 [pin 35] - IO4 [pin 8] - IO40 [pin 36] - IO41 [pin 37] - IO42 [pin 38] - IO45 [pin 41] - IO46 [pin 44] - IO47 [pin 27] - IO48 [pin 30] - IO5 [pin 9] - IO6 [pin 10] - IO7 [pin 11] - IO8 [pin 12] - IO9 [pin 13] - RXD0 [pin 40] - TXD0 [pin 39] ### U2 — [RFM95W-868S2](https://www.flux.ai/adrian95/rfm95w-868s2~371.md) - Manufacturer Part Number: RFM95W-868S2 - Package: XCVR_RFM95W-868S2 - Part Type: Module - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.rfsolutions.co.uk/downloads/1463993415RFM95_96_97_98W.pdf - Manufacturer Name: RF Solutions - Package or Case Code: XCVR_RFM95W-868S2 - Role: Modulation / Demodulation - Role Details: LoRa transceiver module for 868 MHz long-range communication **Pins:** - 3_3V [pin 13] - ANT [pin 9] - DIO0 [pin 14] - DIO1 [pin 15] - DIO2 [pin 16] - DIO3 [pin 11] - DIO4 [pin 12] - DIO5 [pin 7] - GND [pin 1] - GND@1 [pin 8] - GND@2 [pin 10] - MISO [pin 2] - MOSI [pin 3] - NSS [pin 5] - RESET [pin 6] - SCK [pin 4] ### U3 — [ST1S06PU33R](https://www.flux.ai/jecstronic/st1s06pu33r~kq0.md) - Part Type: Integrated Circuit - Manufacturer Part Number: ST1S06PU33R - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/b3/2f/7b/c6/95/7d/40/e8/CD00100211.pdf/files/CD00100211.pdf/jcr:content/translations/en.CD00100211.pdf - Package: 6-VDFN - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power Conversion - Role Details: 3.3 V, 1 A buck regulator for main 3.3 V rail - Manufacturer Name: STMicroelectronics **Pins:** - FB/VO [pin 1] - GND [pin 7] - GND [pin 2] - SW [pin 3] - VIN_A [pin 5] - VIN_SW [pin 4] - VINH [pin 6] ### U4 — [AAT4610BIGV-T1](https://www.flux.ai/kicad-part-library/aat4610bigv-t1~sxt.md) - Manufacturer Part Number: AAT4610BIGV-T1 - Manufacturer Name: Skyworks Solutions, Inc. - Role Details: Load switch for power gating ENS161, ENS210, and RFM95W - Role: Switch - Datasheet URL: http://www.skyworksinc.com/uploads/documents/201937A.pdf - Package or Case Code: SOT-23-5 **Pins:** - ~{ON} [pin 4] - GND [pin 2] - IN [pin 5] - OUT [pin 1] - SET [pin 3] ### U5 — [AAT4610BIGV-T1](https://www.flux.ai/kicad-part-library/aat4610bigv-t1~sxt.md) - Role Details: Load switch for power gating ENS161, ENS210, and RFM95W - Datasheet URL: http://www.skyworksinc.com/uploads/documents/201937A.pdf - Package or Case Code: SOT-23-5 - Manufacturer Name: Skyworks Solutions, Inc. - Manufacturer Part Number: AAT4610BIGV-T1 - Role: Switch **Pins:** - ~{ON} [pin 4] - GND [pin 2] - IN [pin 5] - OUT [pin 1] - SET [pin 3] ### U6 — [AAT4610BIGV-T1](https://www.flux.ai/kicad-part-library/aat4610bigv-t1~sxt.md) - Datasheet URL: http://www.skyworksinc.com/uploads/documents/201937A.pdf - Package or Case Code: SOT-23-5 - Role Details: Load switch for power gating ENS161, ENS210, and RFM95W - Manufacturer Part Number: AAT4610BIGV-T1 - Manufacturer Name: Skyworks Solutions, Inc. - Role: Switch **Pins:** - ~{ON} [pin 4] - GND [pin 2] - IN [pin 5] - OUT [pin 1] - SET [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/neilc1964/architectural-lavender-translation-collar~64](https://www.flux.ai/neilc1964/architectural-lavender-translation-collar~64).* --- *Generated from [https://www.flux.ai/neilc1964/architectural-lavender-translation-collar~64](https://www.flux.ai/neilc1964/architectural-lavender-translation-collar~64)*