# Smart Kart Notes Scales ## Description Production four-channel 200 kg load-cell ADC board using dedicated HX711 converters and a Raspberry Pi 40-pin GPIO interface, optimized for low analog noise and enclosure mounting. ## Project Details - **Owner:** bdsax - **Created:** 8/13/2026 - **Last Updated:** 8/13/2026 - **Visibility:** Public - **Operating Voltage:** 3.3V - **Implementation Details:** ADC Board Rev A - **Connectivity:** Raspberry Pi GPIO ## Key Components ### H1 — [M3 Mounting Hole](https://www.flux.ai/vasyl/m3-mounting-hole~kc3.md) - Functional Group: Mechanical - Product Info Url: https://www.mcmaster.com/screws/drive-style~torx/rounded-head-style~pan/material~steel/specifications-met~iso-7045/thread-size~m3/finish~zinc-plated/ **Pins:** - terminal ### H2 — [M3 Mounting Hole](https://www.flux.ai/vasyl/m3-mounting-hole~kc3.md) - Product Info Url: https://www.mcmaster.com/screws/drive-style~torx/rounded-head-style~pan/material~steel/specifications-met~iso-7045/thread-size~m3/finish~zinc-plated/ - Functional Group: Mechanical **Pins:** - terminal ### H3 — [M3 Mounting Hole](https://www.flux.ai/vasyl/m3-mounting-hole~kc3.md) - Functional Group: Mechanical - Product Info Url: https://www.mcmaster.com/screws/drive-style~torx/rounded-head-style~pan/material~steel/specifications-met~iso-7045/thread-size~m3/finish~zinc-plated/ **Pins:** - terminal ### H4 — [M3 Mounting Hole](https://www.flux.ai/vasyl/m3-mounting-hole~kc3.md) - Functional Group: Mechanical - Product Info Url: https://www.mcmaster.com/screws/drive-style~torx/rounded-head-style~pan/material~steel/specifications-met~iso-7045/thread-size~m3/finish~zinc-plated/ **Pins:** - terminal ### J1 — [1729160](https://www.flux.ai/adrian95/1729160~ov.md) - Datasheet URL: http://www.phoenixcontact.com/de/produkte/1729160/pdf - Functional Group: LF HX711 Channel - Package or Case Code: 1729160 - Symbol Style: parametric-v1 - Manufacturer Name: Phoenix Contact - Part Type: Connector - Manufacturer Part Number: 1729160 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### J2 — [1729160](https://www.flux.ai/adrian95/1729160~ov.md) - Datasheet URL: http://www.phoenixcontact.com/de/produkte/1729160/pdf - Package or Case Code: 1729160 - Symbol Style: parametric-v1 - Functional Group: LR HX711 Channel - Manufacturer Name: Phoenix Contact - Part Type: Connector - Manufacturer Part Number: 1729160 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### J3 — [1729160](https://www.flux.ai/adrian95/1729160~ov.md) - Datasheet URL: http://www.phoenixcontact.com/de/produkte/1729160/pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1729160 - Manufacturer Name: Phoenix Contact - Functional Group: RF HX711 Channel - Part Type: Connector - Symbol Style: parametric-v1 - Package or Case Code: 1729160 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### J4 — [1729160](https://www.flux.ai/adrian95/1729160~ov.md) - Functional Group: RR HX711 Channel - Datasheet URL: http://www.phoenixcontact.com/de/produkte/1729160/pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1729160 - Manufacturer Name: Phoenix Contact - Part Type: Connector - Package or Case Code: 1729160 - Symbol Style: parametric-v1 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### J5 — [TSW-120-07-G-D](https://www.flux.ai/adrian95/tsw-120-07-g-d~l7v.md) - Part Type: Connector - Functional Group: Power and GPIO - Manufacturer Name: Samtec Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://suddendocs.samtec.com/catalog_english/tsw_th.pdf - Manufacturer Part Number: TSW-120-07-G-D **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### Q1 — [S8550](https://www.flux.ai/jecstronic/s8550~oq.md) - Functional Group: LF HX711 Channel - Manufacturer Part Number: S8550 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Name: MDD - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/NextGen%20Components%20PDFs/SOT23S8550S2TY.pdf **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q2 — [S8550](https://www.flux.ai/jecstronic/s8550~oq.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/NextGen%20Components%20PDFs/SOT23S8550S2TY.pdf - Functional Group: LR HX711 Channel - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Name: MDD - Manufacturer Part Number: S8550 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q3 — [S8550](https://www.flux.ai/jecstronic/s8550~oq.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/NextGen%20Components%20PDFs/SOT23S8550S2TY.pdf - Manufacturer Name: MDD - Part Type: Transistor - Functional Group: RF HX711 Channel - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S8550 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q4 — [S8550](https://www.flux.ai/jecstronic/s8550~oq.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/NextGen%20Components%20PDFs/SOT23S8550S2TY.pdf - Manufacturer Name: MDD - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Functional Group: RR HX711 Channel - Manufacturer Part Number: S8550 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### TP_LF_3V3 — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_LF_AMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R **Pins:** - ~ [pin 1] ### TP_LF_APLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Manufacturer Name: Harwin Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Functional Group: Channel Test Points **Pins:** - ~ [pin 1] ### TP_LF_CLOCK — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Name: Harwin Inc. **Pins:** - ~ [pin 1] ### TP_LF_DATA — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Manufacturer Name: Harwin Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Functional Group: Channel Test Points **Pins:** - ~ [pin 1] ### TP_LF_EMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_LF_EPLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R **Pins:** - ~ [pin 1] ### TP_LF_GND — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_LR_3V3 — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_LR_AMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_LR_APLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points **Pins:** - ~ [pin 1] ### TP_LR_CLOCK — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_LR_DATA — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Name: Harwin Inc. **Pins:** - ~ [pin 1] ### TP_LR_EMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_LR_EPLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_LR_GND — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_RF_3V3 — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_RF_AMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_RF_APLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_RF_CLOCK — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_RF_DATA — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_RF_EMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - Manufacturer Name: Harwin Inc. **Pins:** - ~ [pin 1] ### TP_RF_EPLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Part Type: Test Point - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R **Pins:** - ~ [pin 1] ### TP_RF_GND — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_RR_3V3 — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R **Pins:** - ~ [pin 1] ### TP_RR_AMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point **Pins:** - ~ [pin 1] ### TP_RR_APLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R **Pins:** - ~ [pin 1] ### TP_RR_CLOCK — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_RR_DATA — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test Point - Manufacturer Name: Harwin Inc. - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Part Number: S2761-46R **Pins:** - ~ [pin 1] ### TP_RR_EMINUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Functional Group: Channel Test Points - Manufacturer Name: Harwin Inc. - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_RR_EPLUS — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Manufacturer Name: Harwin Inc. - Manufacturer Part Number: S2761-46R - Functional Group: Channel Test Points - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### TP_RR_GND — [S2761-46R](https://www.flux.ai/silicon-yard/s2761-46r.md) - Functional Group: Channel Test Points - Manufacturer Part Number: S2761-46R - Datasheet URL: https://www.harwin.com/api/download/datasheet/S2761-46R - Manufacturer Name: Harwin Inc. - Part Type: Test Point - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~ [pin 1] ### U1 — [HX711](https://www.flux.ai/kicad-part-library/hx711~na6.md) - Datasheet URL: https://web.archive.org/web/20220615044707/https://akizukidenshi.com/download/ds/avia/hx711.pdf - Package or Case Code: SOP-16_3.9x9.9mm_P1.27mm - Functional Group: LF HX711 Channel - Manufacturer Part Number: HX711 **Pins:** - AGND [pin 5] - AVDD [pin 3] - BASE [pin 2] - DOUT [pin 12] - DVDD [pin 16] - INA- [pin 7] - INA+ [pin 8] - INB- [pin 9] - INB+ [pin 10] - PD_SCK [pin 11] - RATE [pin 15] - VBG [pin 6] - VFB [pin 4] - VSUP [pin 1] - XI [pin 14] - XO [pin 13] ### U2 — [HX711](https://www.flux.ai/kicad-part-library/hx711~na6.md) - Datasheet URL: https://web.archive.org/web/20220615044707/https://akizukidenshi.com/download/ds/avia/hx711.pdf - Package or Case Code: SOP-16_3.9x9.9mm_P1.27mm - Functional Group: LR HX711 Channel - Manufacturer Part Number: HX711 **Pins:** - AGND [pin 5] - AVDD [pin 3] - BASE [pin 2] - DOUT [pin 12] - DVDD [pin 16] - INA- [pin 7] - INA+ [pin 8] - INB- [pin 9] - INB+ [pin 10] - PD_SCK [pin 11] - RATE [pin 15] - VBG [pin 6] - VFB [pin 4] - VSUP [pin 1] - XI [pin 14] - XO [pin 13] ### U3 — [HX711](https://www.flux.ai/kicad-part-library/hx711~na6.md) - Functional Group: RF HX711 Channel - Datasheet URL: https://web.archive.org/web/20220615044707/https://akizukidenshi.com/download/ds/avia/hx711.pdf - Package or Case Code: SOP-16_3.9x9.9mm_P1.27mm - Manufacturer Part Number: HX711 **Pins:** - AGND [pin 5] - AVDD [pin 3] - BASE [pin 2] - DOUT [pin 12] - DVDD [pin 16] - INA- [pin 7] - INA+ [pin 8] - INB- [pin 9] - INB+ [pin 10] - PD_SCK [pin 11] - RATE [pin 15] - VBG [pin 6] - VFB [pin 4] - VSUP [pin 1] - XI [pin 14] - XO [pin 13] ### U4 — [HX711](https://www.flux.ai/kicad-part-library/hx711~na6.md) - Package or Case Code: SOP-16_3.9x9.9mm_P1.27mm - Datasheet URL: https://web.archive.org/web/20220615044707/https://akizukidenshi.com/download/ds/avia/hx711.pdf - Functional Group: RR HX711 Channel - Manufacturer Part Number: HX711 **Pins:** - AGND [pin 5] - AVDD [pin 3] - BASE [pin 2] - DOUT [pin 12] - DVDD [pin 16] - INA- [pin 7] - INA+ [pin 8] - INB- [pin 9] - INB+ [pin 10] - PD_SCK [pin 11] - RATE [pin 15] - VBG [pin 6] - VFB [pin 4] - VSUP [pin 1] - XI [pin 14] - XO [pin 13] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/bdsax/smart-kart-notes-scales~3u](https://www.flux.ai/bdsax/smart-kart-notes-scales~3u).* --- *Generated from [https://www.flux.ai/bdsax/smart-kart-notes-scales~3u](https://www.flux.ai/bdsax/smart-kart-notes-scales~3u)*