# Thermal Accel Sensor ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** dbark - **Created:** 4/29/2026 - **Last Updated:** 4/30/2026 - **Visibility:** Public - **Design Status:** Frozen for manual routing review - **Routing Review Scope:** Manual routing review only; no schematic or PCB architecture changes intended - **Architecture Freeze Date:** 2026-04-29 ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/cherepanyadima/usblc6-2sc6~4b.md) - Datasheet URL: https://www.st.com/resource/en/datasheet/cd00050750.pdf - Board Partition: Secondary power/interface board - Manufacturer Part Number: USBLC6-2SC6 - Role Details: ESD protection for pogo UART lines moved to secondary board before board-to-board transition. - Part Type: Diode - Manufacturer Name: STMicroelectronics **Pins:** - GND [pin 2] - I/O1_IN [pin 1] - I/O1_OUT [pin 6] - I/O2_IN [pin 3] - I/O2_OUT [pin 4] - VBUS [pin 5] ### F1 — [0603L050YR](https://www.flux.ai/lcsc/0603l050yr~ua87.md) - Board Partition: Secondary power/interface board - Datasheet URL: https://www.littelfuse.com/assetdocs/resettable-ptcs-0603l-datasheet?assetguid=879563f9-97a7-4e71-adba-37de085b333f - LCSC Part Number: C207015 - Manufacturer Name: Littelfuse Inc. - Manufacturer Part Number: 0603L050YR - Part Type: Resettable Fuses - Product Info Url: https://lcsc.com/product-detail/Surface-Mount-Fuses_Littelfuse_0603L050YR_Littelfuse-0603L050YR_C207015.html - Role Details: Pogo/charger 5V input fuse moved to secondary power/interface board. - Package or Case Code: F0603 - License: https://creativecommons.org/licenses/by/4.0/ - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [SM02B-GHS-TB(LF)(SN)](https://www.flux.ai/lcsc/sm02b-ghs-tblfsn~twzm.md) - Voltage Rating: 50V - Part Type: Wire To Board / Wire To Wire Connector - JLCPCB Part Class: Extended Part - Connector Rows: 1 - Operating Temperature: -25℃~+85℃ - Current Rating: 1A - Connector Pitch: 1.25mm - Connector Positions: 2 - Manufacturer Part Number: SM02B-GHS-TB(LF)(SN) - LCSC Part Number: C189893 - Package or Case Code: CONN-SMD_SM02B-GHS-TB-LF-SN - Board Partition: Secondary power/interface board - Product Info Url: https://lcsc.com/product-detail/Connectors_JST-Sales-America_SM02B-GHS-TB-LF-SN_JST-Sales-America-SM02B-GHS-TB-LF-SN_C189893.html - Connector Type: Headers and Wire Housings - Role Details: Small LiPo battery connector moved to secondary board. - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-SM02B-GHS-TB-LF-SN_C189893.pdf - Manufacturer Name: JST **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J10 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110~du.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf - Board Partition: Secondary power/interface board - Role: External Antenna Connector - Role Details: Secondary board RF/mechanical interface. Use a short 50 ohm coax pigtail between ESP32-C3-MINI-1U module connector and this connector or final enclosure antenna. Keep RF area clear and referenced to GND. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: U.FL-R-SMT-1(10) - Manufacturer Name: Hirose Electric Co Ltd **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### J2 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Board Partition: Secondary power/interface board - Role Details: Pogo pad: 5V charge input. **Pins:** - P1 ### J3 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Pogo pad: ground reference. - Board Partition: Secondary power/interface board **Pins:** - P1 ### J4 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Board Partition: Secondary power/interface board - Role Details: Pogo pad: UART TX path to programmer via ESD protection and board-to-board interconnect. **Pins:** - P1 ### J5 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Board Partition: Secondary power/interface board - Role Details: Pogo pad: UART RX path from programmer via ESD protection and board-to-board interconnect. **Pins:** - P1 ### J6 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Pogo pad: ESP_EN reset/programming access routed through board-to-board interconnect. - Board Partition: Secondary power/interface board **Pins:** - P1 ### J7 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Pogo pad: BOOT/programming access routed through board-to-board interconnect. - Board Partition: Secondary power/interface board **Pins:** - P1 ### J8 — [BM23PF0.8-10DP-0.35V(51)](https://www.flux.ai/adrian95/bm23pf0p8-10dp-0p35v51.md) - Datasheet URL: https://www.mouser.com/datasheet/3/731/1/BM23PF0.8_10DP_0.35V_51_CL0480_0306_0_51_2DDrawing_BM23PF0.8_DP_0.35V_51_2D_ENG_Multi.pdf - Mount: Surface Mount - License: https://creativecommons.org/licenses/by/4.0/ - Board Partition: Primary sensor/MCU board - Part Type: Connector - Role Details: Primary board side; mates to J9 on the secondary board. Pinout: 1 GND, 2 3V3, 3 VBAT, 4 POGO_5V_IN, 5 UART_TX_MCU, 6 UART_RX_MCU, 7 ESP_EN, 8 BOOT, 9 CHG_STAT, 10 GND. - Package or Case Code: TO - Manufacturer Part Number: BM23PF0.8-10DP-0.35V(51) - Manufacturer Name: Hirose - Role: Primary Board-to-Board Interconnect **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin MP1] - 12 [pin MP3] - 13 [pin MP2] - 14 [pin MP4] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J9 — [BM23PF0.8-10DP-0.35V(51)](https://www.flux.ai/adrian95/bm23pf0p8-10dp-0p35v51.md) - Part Type: Connector - Board Partition: Secondary power/interface board - Package or Case Code: TO - Role: Secondary Board-to-Board Interconnect - Manufacturer Part Number: BM23PF0.8-10DP-0.35V(51) - Manufacturer Name: Hirose - Role Details: Secondary board side; mates to J8 on the primary board. Pinout mirrors J8: 1 GND, 2 3V3, 3 VBAT, 4 POGO_5V_IN, 5 UART_TX_MCU, 6 UART_RX_MCU, 7 ESP_EN, 8 BOOT, 9 CHG_STAT, 10 GND. - Datasheet URL: https://www.mouser.com/datasheet/3/731/1/BM23PF0.8_10DP_0.35V_51_CL0480_0306_0_51_2DDrawing_BM23PF0.8_DP_0.35V_51_2D_ENG_Multi.pdf - Mount: Surface Mount - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin MP1] - 12 [pin MP3] - 13 [pin MP2] - 14 [pin MP4] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### U1 — [ESP32-C3-MINI-1U-N4](https://www.flux.ai/vasyl/esp32-c3-mini-1u-n4~2zk.md) - Part Type: RF Transceiver Module - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf - Role Details: ESP32-C3 ESP-NOW MCU retained on primary board; external antenna cable exits toward secondary RF/mechanical interface. - Board Partition: Primary sensor/MCU board - Manufacturer Name: Espressif Systems - Manufacturer Part Number: ESP32-C3-MINI-1U-N4 **Pins:** - 3V3 [pin 3] - EN [pin 8] - GND [pin 1] - GND__1 [pin 2] - GND__10 [pin 42] - GND__11 [pin 43] - GND__12 [pin 44] - GND__13 [pin 45] - GND__14 [pin 46] - GND__15 [pin 47] - GND__16 [pin 48] - GND__17 [pin 49_1] - GND__18 [pin 49_2] - GND__19 [pin 49_3] - GND__2 [pin 11] - GND__20 [pin 49_4] - GND__21 [pin 49_5] - GND__22 [pin 49_6] - GND__23 [pin 49_7] - GND__24 [pin 49_8] - GND__25 [pin 49_9] - GND__26 [pin 50] - GND__27 [pin 51] - GND__28 [pin 52] - GND__29 [pin 53] - GND__3 [pin 14] - GND__4 [pin 36] - GND__5 [pin 37] - GND__6 [pin 38] - GND__7 [pin 39] - GND__8 [pin 40] - GND__9 [pin 41] - IO0 [pin 12] - IO1 [pin 13] - IO10 [pin 16] - IO18 [pin 26] - IO19 [pin 27] - IO2 [pin 5] - IO3 [pin 6] - IO4 [pin 18] - IO5 [pin 19] - IO6 [pin 20] - IO7 [pin 21] - IO8 [pin 22] - IO9 [pin 23] - NC [pin 4] - NC__1 [pin 7] - NC__10 [pin 32] - NC__11 [pin 33] - NC__12 [pin 34] - NC__13 [pin 35] - NC__2 [pin 9] - NC__3 [pin 10] - NC__4 [pin 15] - NC__5 [pin 17] - NC__6 [pin 24] - NC__7 [pin 25] - NC__8 [pin 28] - NC__9 [pin 29] - RXD0 [pin 30] - TXD0 [pin 31] ### U2 — [TMP117AIDRVR](https://www.flux.ai/adrian95/tmp117aidrvr~1du.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: TMP117AIDRVR - Datasheet URL: https://www.ti.com/lit/ds/symlink/tmp117.pdf - Part Type: Integrated Circuit - Role Details: Contact temperature sensor; place centered over thermal pad/contact region to aluminum plate or magnet. - Board Partition: Primary sensor/MCU board **Pins:** - ADD0 [pin 4] - ALERT [pin 3] - GND_1 [pin 2] - GND_2 [pin 7] - SCL [pin 1] - SDA [pin 6] - V+ [pin 5] ### U3 — [LIS2DW12TR](https://www.flux.ai/adrian95/lis2dw12tr~0ro.md) - Manufacturer Name: STMicroelectronics - License: https://creativecommons.org/licenses/by/4.0/ - Board Partition: Primary sensor/MCU board - Manufacturer Part Number: LIS2DW12TR - Role Details: Motion sensor retained on primary board near MCU with short I2C and interrupt routing. - Part Type: Sensor - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/group3/30/3a/4e/6b/68/16/4a/35/DM00323179/files/DM00323179.pdf/jcr:content/translations/en.DM00323179.pdf **Pins:** - CS [pin 2] - GND_1 [pin 6] - GND_2 [pin 8] - INT1 [pin 12] - INT2 [pin 11] - NC [pin 5] - RES [pin 7] - SCL/SPC [pin 1] - SDA/SDI/SDO [pin 4] - SDO/SA0 [pin 3] - VDD [pin 9] - VDDIO [pin 10] ### U4 — [MCP73831T-2ATI/OT](https://www.flux.ai/adrian95/mcp73831t-2atiot~46p.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology - Manufacturer Part Number: MCP73831T-2ATI/OT - Board Partition: Secondary power/interface board - Part Type: Integrated Circuit - Role Details: LiPo charger moved to secondary board; keep near pogo 5V input and battery connector; route charger status through J8/J9. - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf **Pins:** - PROG [pin 5] - STAT [pin 1] - VBAT [pin 3] - VDD [pin 4] - VSS [pin 2] ### U5 — [TPS63031DSKR](https://www.flux.ai/adrian95/tps63031dskr~yd3.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps63030.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Board Partition: Secondary power/interface board - Manufacturer Part Number: TPS63031DSKR - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit - Role Details: 3.3V buck-boost regulator moved to secondary board; route regulated 3V3 and VBAT/GND through board-to-board connector. **Pins:** - EN [pin 6] - EP [pin 11] - FB [pin 10] - GND [pin 9] - L1 [pin 4] - L2 [pin 2] - PGND [pin 3] - PS/SYNC [pin 7] - VIN [pin 5] - VINA [pin 8] - VOUT [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/dbark/thermal-accel-sensor~4a](https://www.flux.ai/dbark/thermal-accel-sensor~4a).* --- *Generated from [https://www.flux.ai/dbark/thermal-accel-sensor~4a](https://www.flux.ai/dbark/thermal-accel-sensor~4a)*