# LoRa load cell manager ## Description Compact LoRa-based load cell manager board. Hosts Heltec WiFi LoRa 32, HX711 ADC for strain gauges, dual VL53L1X ToF sensors, 3.3V/2.8V rails, user buttons/LEDs, and screw terminals for robust interfacing. ## Project Details - **Owner:** vasy_skral - **Created:** 9/10/2025 - **Last Updated:** 9/16/2025 - **Visibility:** Public - **Assembly Instructions:** Install the Heltec WiFi LoRa 32 board into J1 and J4. USB should be on cutout side. The cutout is for easy reach of the battery connector ## Key Components ### CN1 — [DB128V-5.08-4P-GN-S](https://www.flux.ai/lcsc/db128v-5p08-4p-gn-s.md) - Manufacturer Name: DORABO(地博电气) - Package or Case Code: CONN-TH_4P-P5.08_DIBO_DB128V-5.08 - JLCPCB Part Class: Extended Part - Part Type: Screw terminal - Manufacturer Part Number: DB128V-5.08-4P-GN-S - LCSC Part Number: C2915641 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### D1 — [1N4148WS-7](https://www.flux.ai/jecstronic/1n4148ws-7.md) - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914BWS-D-1801390.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4148WS-7-F - Manufacturer Name: SMC Diode Solutions - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### D2 — [1N4148WS-7](https://www.flux.ai/jecstronic/1n4148ws-7.md) - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914BWS-D-1801390.pdf - Part Type: Diode - Manufacturer Part Number: 1N4148WS-7-F - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: SMC Diode Solutions **Pins:** - A [pin 2] - K [pin 1] ### J1 — [Pin Socket 01x18 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x18-254mm-vertical.md) - Manufacturer Part Number: HC-PM254-8.5H-1x18PZ - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_17 [pin 17] - Pin_18 [pin 18] - 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] - Pin_9 [pin 9] ### J4 — [Pin Socket 01x18 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x18-254mm-vertical.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: HC-PM254-8.5H-1x18PZ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_17 [pin 17] - Pin_18 [pin 18] - 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] - Pin_9 [pin 9] ### LED1 — [LED-0805-Template](https://www.flux.ai/vasy_skral/led-0805-template.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Part Number: KT-0805Y **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED-0805-Template](https://www.flux.ai/vasy_skral/led-0805-template.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Part Number: KT-0805Y **Pins:** - A [pin 2] - K [pin 1] ### Q1 — [BSS138](https://www.flux.ai/vasy_skral/bss138.md) - Manufacturer Part Number: BSS138-7-F - Part Type: Transistor - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q2 — [BSS138](https://www.flux.ai/vasy_skral/bss138.md) - Part Type: Transistor - Manufacturer Part Number: BSS138-7-F - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf - Manufacturer Name: onsemi **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q3 — [MMBT4403](https://www.flux.ai/adrian95/mmbt4403.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Datasheet URL: https://www.snapeda.com/parts/MMBT4403/ON%20Semiconductor/datasheet/ - Part Type: Transistor - Manufacturer Part Number: MMBT4403 **Pins:** - B [pin B] - C [pin C] - E [pin E] ### SW1 — [B3F-4055](https://www.flux.ai/jecstronic/b3f-4055.md) - Manufacturer Part Number: B3F-4055 - Manufacturer Name: OMRON - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Switch - Datasheet URL: https://www.snapeda.com/parts/B3F-4055/Omron%20Electronics/datasheet/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW2 — [B3F-4055](https://www.flux.ai/jecstronic/b3f-4055.md) - Part Type: Switch - Datasheet URL: https://www.snapeda.com/parts/B3F-4055/Omron%20Electronics/datasheet/ - Manufacturer Part Number: B3F-4055 - Manufacturer Name: OMRON - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### U1 — [HX711](https://www.flux.ai/adrian95/hx711.md) - Part Type: Integrated Circuit - Datasheet URL: https://www.snapeda.com/parts/HX711/AVIA%20SEMICONDUCTOR/datasheet/ - Manufacturer Name: Avia Semiconductor - Manufacturer Part Number: HX711 - License: https://creativecommons.org/licenses/by/4.0/ **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 — [LP5907MFX-2.8/NOPB](https://www.flux.ai/vasy_skral/lp5907mfx-2p8nopb.md) - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flp5907 - Part Type: Integrated Circuit - Manufacturer Part Number: LP5907MFX-2.8/NOPB **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC [pin 4] - OUT [pin 5] ### U3 — [VL53L1CXV0FY/1](https://www.flux.ai/vasy_skral/vl53l1cxv0fy1.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: STMicroelectronics - Datasheet URL: https://www.st.com/resource/en/datasheet/vl53l1x.pdf - Manufacturer Part Number: VL53L1CXV0FY/1 - Part Type: Integrated Circuit **Pins:** - AVDD [pin 11] - AVDDVCSEL [pin 1] - AVSSVCSEL [pin 2] - DNC [pin 8] - GND [pin 3] - GND [pin 12] - GND [pin 4] - GND [pin 6] - GPIO1 [pin 7] - SCL [pin 10] - SDA [pin 9] - XSHUT [pin 5] ### U5 — [VL53L1CXV0FY/1](https://www.flux.ai/vasy_skral/vl53l1cxv0fy1.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.st.com/resource/en/datasheet/vl53l1x.pdf - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: VL53L1CXV0FY/1 - Part Type: Integrated Circuit **Pins:** - AVDD [pin 11] - AVDDVCSEL [pin 1] - AVSSVCSEL [pin 2] - DNC [pin 8] - GND [pin 3] - GND [pin 12] - GND [pin 4] - GND [pin 6] - GPIO1 [pin 7] - SCL [pin 10] - SDA [pin 9] - XSHUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/vasy_skral/lora-load-cell-manager](https://www.flux.ai/vasy_skral/lora-load-cell-manager).* --- *Generated from [https://www.flux.ai/vasy_skral/lora-load-cell-manager](https://www.flux.ai/vasy_skral/lora-load-cell-manager)*