# BLE temperature sensor Reference Design ## Description This is a reference design of the Bluetooth Low-Energy (BLE) temperature sensor. It uses an ESP32-MINI-1 microcontroller to connect to an SHT31-DIS-B2.5KS sensor. The sensor can be powered through connector J15, and additional components provide voltage regulation and derbiaising. Temperature data can be accessed via BLE. #referenceDesign #simple-embedded #espressif #template #reference-design ## Project Details - **Owner:** zixuanchen - **Created:** 1/3/2025 - **Last Updated:** 1/3/2025 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ ## Key Components ### ESP1 — [ESP32-MINI-1](https://www.flux.ai/vasy_skral/esp32-mini-1.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-mini-1_datasheet_en.pdf - Part Type: Module - Manufacturer Name: Espressif Systems - Manufacturer Part Number: ESP32-MINI-1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - <=EXP [pin 62] - <=GND [pin 47] - 3V3 [pin 3] - EN [pin 8] - EXP [pin 60] - EXP [pin 63] - EXP [pin 57] - EXP [pin 59] - EXP [pin 56] - EXP [pin 61] - EXP [pin 58] - EXP [pin 55] - GND [pin 44] - GND [pin 27] - GND [pin 45] - GND [pin 46] - GND [pin 49] - GND [pin 2] - GND [pin 39] - GND [pin 42] - GND [pin 52] - GND [pin 41] - GND [pin 40] - GND [pin 54] - GND [pin 51] - GND [pin 53] - GND [pin 50] - GND [pin 43] - GND [pin 48] - GND [pin 1] - GND [pin 38] - I34 [pin 9] - I35 [pin 10] - I36 [pin 4] - I37 [pin 5] - I38 [pin 6] - I39 [pin 7] - IO0 [pin 21] - IO10 [pin 26] - IO12 [pin 17] - IO13 [pin 18] - IO14 [pin 16] - IO15 [pin 19] - IO18 [pin 30] - IO19 [pin 32] - IO2 [pin 20] - IO21 [pin 34] - IO22 [pin 33] - IO23 [pin 31] - IO25 [pin 13] - IO26 [pin 14] - IO27 [pin 15] - IO32 [pin 11] - IO33 [pin 12] - IO4 [pin 22] - IO5 [pin 29] - IO9 [pin 25] - NC [pin 37] - NC [pin 28] - NC [pin 23] - NC [pin 24] - RXD0 [pin 35] - TXD0 [pin 36] ### J15 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/vasyl/s2b-ph-sm4-tblfsn.md) - Manufacturer Name: JST Sales America Inc. - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Part Type: Connector - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) **Pins:** - 1 [pin 1] - 2 [pin 2] - SHIELD [pin S1] - SHIELD__1 [pin S2] ### J4 — [SM06B-SRSS-TB(LF)(SN)](https://www.flux.ai/vasy_skral/sm06b-srss-tblfsn.md) - Part Type: Connector - Manufacturer Name: JST Sales America Inc. - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/eSH.pdf - Manufacturer Part Number: SM06B-SRSS-TB(LF)(SN) - 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] ### Q1 — BSS138 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf - Manufacturer Name: onsemi - Manufacturer Part Number: BSS138 **Pins:** - D - G - S ### Q2 — BSS138 - Manufacturer Name: onsemi - Manufacturer Part Number: BSS138 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf **Pins:** - D - G - S ### SW1 — [PTS815](https://www.flux.ai/vasy_skral/pts815.md) - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS - Manufacturer Name: C&K - Part Type: Switch **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### SW2 — [PTS815](https://www.flux.ai/vasy_skral/pts815.md) - Manufacturer Name: C&K - Part Type: Switch - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### U1 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Part Number: AP2112K-3.3TRG1 - Datasheet URL: Diodes Incorporated - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U2 — [SHT31-DIS-B2.5KS](https://www.flux.ai/vasyl/sht31-dis-b25ks.md) - Manufacturer Name: Sensirion AG - Manufacturer Part Number: SHT31-DIS-B2.5KS - Part Type: Integrated Circuit - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Sensirion%20PDFs/HT_DS_SHT3x_DIS.pdf **Pins:** - ~RESET [pin 6] - ADDR [pin 2] - ALERT [pin 3] - R [pin 7] - SCL [pin 4] - SDA [pin 1] - VDD [pin 5] - VSS [pin 9] - VSS [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/zixuanchen/ble-temperature-sensor-reference-design](https://www.flux.ai/zixuanchen/ble-temperature-sensor-reference-design).* --- *Generated from [https://www.flux.ai/zixuanchen/ble-temperature-sensor-reference-design](https://www.flux.ai/zixuanchen/ble-temperature-sensor-reference-design)*