# C4 Smart Scale Carrier Rev A ## Description Arduino Uno R4 WiFi shield/carrier PCB for the C4 Coffee Co smart scale prototype, integrating RS485 load-cell wiring, service connectors, display/buttons, protection footprints, and test access. ## Project Details - **Owner:** olivergriffithjones - **Created:** 6/29/2026 - **Last Updated:** 6/29/2026 - **Visibility:** Public - **Human Interface:** Buttons - **Operating Voltage:** 5V - **Domain:** IoT - **Connectivity:** RS485 - **Implementation Details:** Arduino Uno shield carrier ## Key Components ### F_LOAD — [MF-R050-2](https://www.flux.ai/adrian95/mf-r050-2~y77.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MF-R050-2 - Datasheet URL: https://www.bourns.com/docs/product-datasheets/mf-r.pdf - Part Type: Fuse - Manufacturer Name: Bourns Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] ### J_A — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - Role: Arduino analog shield header - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **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] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J_BTN — [Connector 01x04 0.100](https://www.flux.ai/vasy_skral/connector-01x04-0100~go.md) - Role: External button connector - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J_D0 — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - Part Type: Connector - Role: Arduino digital low shield header - License: https://creativecommons.org/licenses/by/4.0/ **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] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J_D8 — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - Role: Arduino digital high shield header - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **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] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J_DISP — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - Role: SPI display connector - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **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] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J_LOAD — [Connector 01x04 0.100](https://www.flux.ai/vasy_skral/connector-01x04-0100~go.md) - Role: Load cell connector - Part Type: Connector - Connector Pitch: 2.54mm **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J_PWR — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Arduino power shield header **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] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J_RS485 — [Connector 01x04 0.100](https://www.flux.ai/vasy_skral/connector-01x04-0100~go.md) - Role: RS485 module logic socket - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### LED_ERROR — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Package: 0805 - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED_STATUS — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Part Type: LED - Package: 0805 **Pins:** - A [pin 2] - K [pin 1] ### SW_MODE — [B3F-1000](https://www.flux.ai/adrian95/b3f-1000~hh8.md) - Manufacturer Name: Omron Electronics Inc-EMC Div - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf - Manufacturer Part Number: B3F-1000 - Part Type: Switch - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW_START — [B3F-1000](https://www.flux.ai/adrian95/b3f-1000~hh8.md) - Part Type: Switch - Manufacturer Name: Omron Electronics Inc-EMC Div - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf - Manufacturer Part Number: B3F-1000 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW_TARE — [B3F-1000](https://www.flux.ai/adrian95/b3f-1000~hh8.md) - Part Type: Switch - Manufacturer Part Number: B3F-1000 - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf - Manufacturer Name: Omron Electronics Inc-EMC Div - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/olivergriffithjones/c4-smart-scale-carrier-rev-a~8o](https://www.flux.ai/olivergriffithjones/c4-smart-scale-carrier-rev-a~8o).* --- *Generated from [https://www.flux.ai/olivergriffithjones/c4-smart-scale-carrier-rev-a~8o](https://www.flux.ai/olivergriffithjones/c4-smart-scale-carrier-rev-a~8o)*