# Smart Espresso Scale ## Description USB-C powered smart espresso scale with ESP32 phone connectivity, load-cell measurement, local data storage, and an integrated display for live weight/timer readout. ## Project Details - **Owner:** ryanf - **Created:** 7/14/2026 - **Last Updated:** 7/14/2026 - **Visibility:** Public - **Power Requirements:** USB-C - **Domain:** Consumer electronics - **Software:** ESP32 - **Human Interface:** Display - **Connectivity:** Bluetooth ## Key Components ### D1 — [150060VS55040](https://www.flux.ai/adrian95/150060vs55040~c2q.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 150060VS55040 - Functional Group: Display and user interface - Role Details: Low-current green status LED - Role: Signal Generation - Part Type: LED - Manufacturer Name: Würth Elektronik - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060VS55040.pdf **Pins:** - A [pin 2] - K [pin 1] ### F1 — [SMD1206P075TF/30](https://www.flux.ai/adrian95/smd1206p075tf30~aa.md) - Role Details: USB VBUS 750mA hold PPTC sized from power budget - Part Type: Fuse - Functional Group: USB-C power/data input - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C46970778.pdf - Role: Protection - Manufacturer Name: RUILON - LCSC Part Number: C46970778 - Manufacturer Part Number: SMD1206P075TF/30 **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB1 — [2506031017Y0 Ferrite](https://www.flux.ai/jlamflux/2506031017y0-ferrite~ta.md) - Manufacturer Part Number: 2506031017Y0 - Functional Group: Load-cell analog front end - Role Details: Ferrite bead isolating 3V3_AFE from main 3V3 rail - Role: Power Filtering - Product Info Url: https://www.digikey.com/en/products/detail/fair-rite-products-corp/2506031017Y0/8594295 - Datasheet URL: https://www.mouser.com/datasheet/2/150/2506031017Y0-1511188.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Role: USB-C receptacle - Symbol Style: parametric-v1 - Part Type: USB C - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: USB-C power/data input - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Manufacturer Name: GCT - Manufacturer Part Number: USB4105-GF-A **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 — MSD-4-A - Functional Group: microSD local storage - Manufacturer Name: CUI Devices - Datasheet URL: https://www.cuidevices.com/product/resource/msd-4-a.pdf - Role Details: microSD socket for local data logging - Role: Energy Storage - Manufacturer Part Number: MSD-4-A - Part Type: Connector **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] ### J3 — [TSW-104-07-G-S](https://www.flux.ai/adrian95/tsw-104-07-g-s~983.md) - Manufacturer Name: Samtec Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Datasheet URL: http://suddendocs.samtec.com/prints/tsw-xxx-xx-xxx-x-xx-xxx-mkt.pdf - Role: Sensing (Shunt) - Role Details: 4-pin load-cell connector: E+, S+, S-, E- - Manufacturer Part Number: TSW-104-07-G-S - Package or Case Code: TSW10407GS - Functional Group: Load-cell analog front end **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW1 — [SW Push SPST NO Alps](https://www.flux.ai/adrian95/sw-push-spst-no-alps~4ii.md) - Part Type: Switch - Functional Group: ESP32-S3 MCU core - Role: Switching - Role Details: RESET button on EN **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) - Part Type: Switch - Functional Group: ESP32-S3 MCU core - Role Details: BOOT button on GPIO0 - Role: Switching **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: Display and user interface - Role Details: User TARE button - Role: Switching **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) - Part Type: Switch - Role Details: User START/STOP button - Functional Group: Display and user interface - Role: Switching **Pins:** - P1 [pin 3] - P2 [pin 1] ### U1 — [ESP32-S3-WROOM-1-N8R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n8r8~na1.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-1_wroom-1u_datasheet_en.pdf - Role Details: Main ESP32-S3 Wi-Fi/BLE MCU module; antenna keepout required at PCB edge - Functional Group: ESP32-S3 MCU core - Manufacturer Name: Espressif Systems - Role: Logic-level Shifting - Part Type: Module - Manufacturer Part Number: ESP32-S3-WROOM-1-N8R8 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 41_9] - GND [pin 41_6] - GND [pin 41_4] - GND [pin 41_2] - GND [pin 41_3] - GND [pin 41_5] - GND [pin 40] - GND [pin 41_1] - GND [pin 1] - GND [pin 41_8] - GND [pin 41_7] - 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] ### U2 — [USBLC6-2SC6](https://www.flux.ai/collinsemasi/usblc6-2sc6~jt.md) - Role Details: USB 2.0 D+/D- ESD array - Part Type: ESD PROTECTION - Manufacturer Name: STMicroelectronics - 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 - Voltage - Breakdown: 6V - Unidirectional Channels: 2 - Voltage - Reverse Standoff: 5.25V - Role: ESD Protection - Operating Temperature: -40°C ~ 150°C (TJ) - Manufacturer Part Number: USBLC6-2SC6 - Functional Group: USB-C power/data input **Pins:** - 1 [pin 1] - 3 [pin 3] - 4 [pin 4] - 6 [pin 6] - GND [pin 2] - VBUS [pin 5] ### U3 — [ST1S06PU33R](https://www.flux.ai/jecstronic/st1s06pu33r~kq0.md) - 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 - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: ST1S06PU33R - Part Type: Integrated Circuit - Role: Power Conversion - Role Details: USB 5V to 3.3V, 1.5A fixed buck; selected over LDO for thermal margin - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: 3.3V buck regulator **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 — [NAU7802SGI](https://www.flux.ai/ryanf/nau7802sgi~7y.md) - Functional Group: Load-cell analog front end - Manufacturer Name: Nuvoton Technology Corporation - Datasheet URL: https://www.nuvoton.com/export/resource-files/NAU7802%20Data%20Sheet%20V1.7.pdf - Role Details: NAU7802 24-bit load-cell ADC; quiet analog placement near load-cell connector - Manufacturer Part Number: NAU7802SGI - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Role: Sensing (Shunt) **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] ### U5 — [TPS22919DCKR](https://www.flux.ai/adrian95/tps22919dckr~ztz.md) - Manufacturer Name: Texas Instruments - Manufacturer Part Number: TPS22919DCKR - Part Type: Integrated Circuit - Package or Case Code: SOT65P210X110-6N - Role: Switching - Role Details: 3.3V load switch for microSD power control - Functional Group: microSD local storage - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: http://www.ti.com/lit/ds/symlink/tps22919.pdf **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-7v1hb~5vl](https://www.flux.ai/ryanf/smart-espresso-scale-7v1hb~5vl).* --- *Generated from [https://www.flux.ai/ryanf/smart-espresso-scale-7v1hb~5vl](https://www.flux.ai/ryanf/smart-espresso-scale-7v1hb~5vl)*