# LoRa soil monitor Reference Design ## Description This is a LoRa soil monitor Reference Design. It uses a STM32L031G6U6S microcontroller and a RFM95W-915S2 LoRa transceiver, integrated with sensor interfacing and LED indicators. Communication occurs via USART and SPI. The system is powered using a battery. #referenceDesign #simple-embedded #stm #template #reference-design ## Project Details - **Owner:** seriousobi - **Created:** 4/15/2025 - **Last Updated:** 4/15/2025 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ ## Key Components ### BATT1 — [1070TR](https://www.flux.ai/jharwinbarrozo/1070tr~eit.md) - Manufacturer Name: Keystone Electronics - Manufacturer Part Number: 1070TR - Voltage: 3V - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p5.pdf **Pins:** - - - + ### IC1 — [MAX40005ANS02+T](https://www.flux.ai/vasyl/max40005ans02plust~u2.md) - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Part Type: Comparators - Datasheet URL: https://datasheets.maximintegrated.com/en/ds/MAX40002-MAX40005.pdf - Manufacturer Part Number: MAX40005ANS02+T **Pins:** - GND [pin B2] - IN [pin A2] - OUT [pin A1] - VCC/REF [pin B1] ### J1 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector~y0b.md) - Part Type: Connector - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Manufacturer Name: Analog Devices - Manufacturer Part Number: FTSH-105-01-L-DV-007-K **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### J2 — [SMD SMA](https://www.flux.ai/vasyl/smd-sma~cv1.md) - Part Type: Integrated Circuit **Pins:** - ~ [pin 2] - ~ [pin 1] ### J4 — [S4B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/jecstronic/s4b-ph-sm4-tblfsn~7fb.md) - Manufacturer Part Number: S4B-PH-SM4-TB(LF)(SN) - Part Type: Connector - Manufacturer Name: JST Sales America Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf **Pins:** - PIN_1 [pin 1] - PIN_2 [pin 2] - PIN_3 [pin 3] - PIN_4 [pin 4] ### LED1 — [LTST-C19HE1WT](https://www.flux.ai/vasy_skral/ltst-c19he1wt~x5i.md) - Part Type: LED - Manufacturer Part Number: 19-237/R6GHBHC-A04/2T - Datasheet URL: https://datasheet.lcsc.com/lcsc/2010222107_Everlight-Elec-19-237-R6GHBHC-A04-2T_C883183.pdf - Manufacturer Name: Everlight Elec **Pins:** - A - B - G - R ### U1 — [RFM95W-915S2](https://www.flux.ai/vasyl/rfm95w-915s2~5r.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Hoperf letrnc - Part Type: RF module - Manufacturer Part Number: RFM95W-915S2 - Datasheet URL: https://cdn.sparkfun.com/assets/learn_tutorials/8/0/4/RFM95_96_97_98W.pdf **Pins:** - 3.3V [pin 13] - ANT [pin 9] - DIO0 [pin 14] - DIO1 [pin 15] - DIO2 [pin 16] - DIO3 [pin 11] - DIO4 [pin 12] - DIO5 [pin 7] - GND [pin 8] - GND [pin 10] - GND [pin 1] - MISO [pin 2] - MOSI [pin 3] - NSS [pin 5] - RESET [pin 6] - SCK [pin 4] ### U2 — [STM32L031G6U6S](https://www.flux.ai/vasyl/stm32l031g6u6s~zrh.md) - Manufacturer Part Number: STM32L031G6U6S - Manufacturer Name: STMicroelectronics - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32l031c6.pdf - Part Type: Microcontroller **Pins:** - BOOT0 [pin 1] - NRST [pin 4] - P14 [pin 22] - PA0 [pin 6] - PA1 [pin 7] - PA10 [pin 20] - PA13 [pin 21] - PA14 [pin 23] - PA2 [pin 8] - PA3 [pin 9] - PA4 [pin 10] - PA5 [pin 11] - PA6 [pin 12] - PA7 [pin 13] - PA8 [pin 18] - PA9 [pin 19] - PB0 [pin 14] - PB1 [pin 15] - PB3 [pin 24] - PB4 [pin 25] - PB5 [pin 26] - PB6 [pin 27] - PB7 [pin 28] - PC14 [pin 2] - PC15 [pin 3] - VDD [pin 17] - VDDA [pin 5] - VSS [pin 16] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/seriousobi/lora-soil-monitor-reference-design~v1](https://www.flux.ai/seriousobi/lora-soil-monitor-reference-design~v1).* --- *Generated from [https://www.flux.ai/seriousobi/lora-soil-monitor-reference-design~v1](https://www.flux.ai/seriousobi/lora-soil-monitor-reference-design~v1)*