# Smart Espresso Scale ## Description BLE smart espresso scale with USB-C power, single-cell Li-ion battery charging, load-cell measurement, local data logging, and an integrated segment/display interface. ## Project Details - **Owner:** ryanf - **Created:** 7/15/2026 - **Last Updated:** 7/15/2026 - **Visibility:** Public ## Key Components ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Functional Group: USB-C Input - Manufacturer Part Number: USB4105-GF-A - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Part Type: USB C - Symbol Style: parametric-v1 - Manufacturer Name: GCT - Manufacturer Name: GCT **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 — [B2B-PH-K-S](https://www.flux.ai/adrian95/b2b-ph-k-s~fx.md) - Functional Group: Battery Charger - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Part Number: B2B-PH-K-S - Package or Case Code: JST_B2B-PH-K-S - Manufacturer Name: JST - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [Pin Header 02x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-02x03-254mm-vertical~z8m.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: ESP32-S3 Core **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J4 — BHR-12-VUA - Functional Group: Load Cell AFE - Manufacturer Part Number: BHR-12-VUA - Digi-Key Part Number: 2057-BHR-12-VUA-ND - Manufacturer Name: Adam Tech - Part Type: Pin Headers **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J5 — MSD-4-A - Datasheet URL: https://www.cuidevices.com/product/resource/msd-4-a.pdf - Functional Group: microSD Storage - Part Type: Connector - Manufacturer Name: CUI Devices - Manufacturer Part Number: MSD-4-A **Pins:** - CD [pin CD1] - CD/DAT3 [pin 2] - CLX [pin 5] - CMD [pin 3] - DAT0 [pin 7] - DAT1 [pin 8] - DAT2 [pin 1] - G1 [pin G1] - G2 [pin G2] - G3 [pin G3] - G4 [pin G4] - VDD [pin 4] - VSS [pin 6] ### LED1 — [KT-0603R](https://www.flux.ai/adrian95/kt-0603r~7c.md) - Part Type: LED - Manufacturer Part Number: KT-0603R - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1810231112_Hubei-KENTO-Elec-KT-0603R_C2286.pdf - Functional Group: Status - Manufacturer Name: Hubei KENTO Elec **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [KT-0603R](https://www.flux.ai/adrian95/kt-0603r~7c.md) - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1810231112_Hubei-KENTO-Elec-KT-0603R_C2286.pdf - Manufacturer Part Number: KT-0603R - Part Type: LED - Functional Group: Status - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Hubei KENTO Elec **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [SW Push SPST NO Alps](https://www.flux.ai/adrian95/sw-push-spst-no-alps~4ii.md) - Functional Group: ESP32-S3 Core - Part Type: Switch **Pins:** - P1 [pin 3] - P2 [pin 1] ### SW2 — [SW Push SPST NO Alps](https://www.flux.ai/adrian95/sw-push-spst-no-alps~4ii.md) - Functional Group: ESP32-S3 Core - Part Type: Switch **Pins:** - P1 [pin 3] - P2 [pin 1] ### SW3 — [SW Push SPST NO Alps](https://www.flux.ai/adrian95/sw-push-spst-no-alps~4ii.md) - Part Type: Switch - Functional Group: Controls **Pins:** - P1 [pin 3] - P2 [pin 1] ### SW4 — [SW Push SPST NO Alps](https://www.flux.ai/adrian95/sw-push-spst-no-alps~4ii.md) - Functional Group: Controls - Part Type: Switch **Pins:** - P1 [pin 3] - P2 [pin 1] ### TH1 — [NTC Thermistor 0603 Template](https://www.flux.ai/vasy_skral/ntc-thermistor-0603-template~gpp.md) - Part Type: Sensor - Resistance: 10kΩ - Functional Group: Battery Charger - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [USBLC6-2SC6](https://www.flux.ai/collinsemasi/usblc6-2sc6~jt.md) - Voltage - Reverse Standoff: 5.25V - 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 - Manufacturer Part Number: USBLC6-2SC6 - Part Type: ESD PROTECTION - Functional Group: USB-C Input - Operating Temperature: -40°C ~ 150°C (TJ) - Unidirectional Channels: 2 - Manufacturer Name: STMicroelectronics - Voltage - Breakdown: 6V **Pins:** - 1 [pin 1] - 3 [pin 3] - 4 [pin 4] - 6 [pin 6] - GND [pin 2] - VBUS [pin 5] ### U2 — [BQ24295RGET](https://www.flux.ai/vasy_skral/bq24295rget~pi8.md) - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/bq24295.pdf - Manufacturer Part Number: BQ24295RGET - Functional Group: Battery Charger - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~CE [pin 9] - BAT [pin 14] - BAT [pin 13] - BTST [pin 21] - D- [pin 3] - D+ [pin 2] - EXP_PAD [pin 25] - ILIM [pin 10] - INT [pin 7] - OTG [pin 8] - PGND [pin 17] - PGND [pin 18] - PMID [pin 23] - QON [pin 12] - REGN [pin 22] - SCL [pin 5] - SDA [pin 6] - STAT [pin 4] - SW [pin 19] - SW [pin 20] - SYS [pin 16] - SYS [pin 15] - TS [pin 11] - VBUS [pin 1] - VBUS [pin 24] ### U3 — [TLV1117LV33DCYR](https://www.flux.ai/thea-flux-parts/tlv1117lv33dcyr~7t.md) - Functional Group: 3V3 Regulation - Manufacturer Part Number: TLV1117LV33DCYR - License: https://www.kicad.org/libraries/license/ - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/tlv1117lv.pdf - Part Type: LDO **Pins:** - GND [pin 1] - VIN [pin 3] - VOUT [pin 2] - VOUT [pin 4] ### U4 — [ESP32-S3-WROOM-1-N8R8](https://www.flux.ai/lcsc/esp32-s3-wroom-1-n8r8~law5.md) - Current - Transmitting: 273mA ~ 330mA - Current - Receiving: 97mA ~ 100mA - Manufacturer Part Number: ESP32-S3-WROOM-1-N8R8 - Voltage Supply: 3V ~ 3.6V - Package or Case Code: WIRELM-SMD_ESP32-S3-WROOM-1 - Frequency: 2.4GHz - Part Type: Module - LCSC Part Number: C2913201 - Functional Group: ESP32-S3 Core - Manufacturer Name: ESPRESSIF(乐鑫) - Datasheet URL: https://www.lcsc.com/datasheet/C2913201.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VWXlNTRlJdUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Symbol Style: parametric-v1 - Operating Temperature: -40°C ~ 65°C (TA) - License: https://creativecommons.org/licenses/by/4.0/ - JLCPCB Part Class: Extended Part **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 41_6] - GND [pin 41_1] - GND [pin 41_4] - GND [pin 41_9] - GND [pin 40] - GND [pin 41_2] - GND [pin 41_7] - GND [pin 41_3] - GND [pin 41_5] - GND [pin 1] - GND [pin 41_8] - IO0 [pin 27] - IO1 [pin 39] - IO10 [pin 18] - IO11 [pin 19] - IO12 [pin 20] - IO13 [pin 21] - IO14 [pin 22] - IO15 [pin 8] - IO16 [pin 9] - IO17 [pin 10] - IO18 [pin 11] - IO19 [pin 13] - IO2 [pin 38] - IO20 [pin 14] - IO21 [pin 23] - IO3 [pin 15] - IO35 [pin 28] - IO36 [pin 29] - IO37 [pin 30] - IO38 [pin 31] - IO39 [pin 32] - IO4 [pin 4] - IO40 [pin 33] - IO41 [pin 34] - IO42 [pin 35] - IO45 [pin 26] - IO46 [pin 16] - IO47 [pin 24] - IO48 [pin 25] - IO5 [pin 5] - IO6 [pin 6] - IO7 [pin 7] - IO8 [pin 12] - IO9 [pin 17] - RXD0 [pin 36] - TXD0 [pin 37] ### U5 — [NAU7802SGI](https://www.flux.ai/ryanf/nau7802sgi~7y.md) - Manufacturer Part Number: NAU7802SGI - Manufacturer Name: Nuvoton Technology Corporation - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Load Cell AFE - Datasheet URL: https://www.nuvoton.com/export/resource-files/NAU7802%20Data%20Sheet%20V1.7.pdf - Part Type: Integrated Circuit **Pins:** - AVDD/LDO [pin 16] - AVSS [pin 8] - DRDY [pin 12] - DVDD [pin 15] - DVSS [pin 9] - R-EFN [pin 7] - R-EFP [pin 1] - SCLK [pin 13] - SDIO [pin 14] - VBG [pin 6] - VIN1N [pin 2] - VIN1P [pin 3] - VIN2N [pin 4] - VIN2P [pin 5] - XIN [pin 10] - XOUT [pin 11] ### U6 — [TPS22919DCKR](https://www.flux.ai/adrian95/tps22919dckr~ztz.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: http://www.ti.com/lit/ds/symlink/tps22919.pdf - Manufacturer Name: Texas Instruments - Package or Case Code: SOT65P210X110-6N - Manufacturer Part Number: TPS22919DCKR - Functional Group: microSD Storage - Part Type: Integrated Circuit **Pins:** - GND [pin 2] - IN [pin 1] - N/C [pin 4] - ON [pin 3] - OUT [pin 6] - QOD [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ryanf/smart-espresso-scale-rhjnq~3nk](https://www.flux.ai/ryanf/smart-espresso-scale-rhjnq~3nk).* --- *Generated from [https://www.flux.ai/ryanf/smart-espresso-scale-rhjnq~3nk](https://www.flux.ai/ryanf/smart-espresso-scale-rhjnq~3nk)*