# ESP32\-S3 LoRa ePaper Sensor

## Description

Battery\-powered ESP32\-S3 LoRa ePaper sensor board with SHT41 environmental sensing, LiPo charging/fuel gauge, 5V input detection, and a 4\.2 inch 300x400 b&w ePaper interface in an 85 x 60 mm low\-profile PCB\.

## Project Details

- **Owner:** jkorenzvit
- **Created:** 7/8/2026
- **Last Updated:** 7/8/2026
- **Visibility:** Public

## Key Components

### J1 — [USB\-C 2\.0 Receptacle](https://flux.ai/vasy_skral/usb-c-2p0-receptacle~1xw.md)

- Role: USB\-C Connector
- Symbol Style: parametric\-v1
- Manufacturer Name: GTC
- Part Type: USB C
- Manufacturer Part Number: USB4105\-GF\-A
- Purchase Url: https://www\.digikey\.com/en/products/detail/gct/USB4105\-GF\-A/11198441
- Role Details: 5V input, CC sink resistors, and USB D\+/D\- to ESP32\-S3 native USB\.
- Datasheet URL: https://gct\.co/files/drawings/usb4105\.pdf

**Pins:**
- CC1 [pin 6]
- CC2 [pin 12]
- D\- [pin 7]
- D\- [pin 9]
- D\+ [pin 10]
- D\+ [pin 8]
- GND [pin 1]
- GND [pin 16]
- GND [pin 15]
- GND [pin 2]
- SBU1 [pin 11]
- SBU2 [pin 5]
- VBUS [pin 3]
- VBUS [pin 14]
- VBUS [pin 4]
- VBUS [pin 13]

### J2 — [532610271](https://flux.ai/lcsc/532610271~gscu.md)

- Datasheet URL: https://www\.lcsc\.com/datasheet/C189700\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNRTlhaUFVTT1RdVDsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- LCSC Part Number: C189700
- Role Details: 1S LiPo BAT\+ and GND connection; protected cell assumed\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- JLCPCB Part Class: Extended Part
- Manufacturer Name: MOLEX
- Connector Pitch: 1\.25mm
- Operating Temperature: \-40\~\+105℃
- Symbol Style: parametric\-v1
- Role: Battery Connector
- Package or Case Code: CONN\-SMD\_532610271
- Manufacturer Part Number: 532610271
- Part Type: Wire To Board / Wire To Wire Connector

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J3 — [FH34SRJ\-24S\-0\.5SH\(50\)](https://flux.ai/lcsc/fh34srj-24s-0p5sh50~ipdi.md)

- Role: ePaper FPC Connector
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1811071030\_HRS\-Hirose\-FH34SRJ\-24S\-0\-5SH\-50\_C324726\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/Others\_Hirose\_FH34SRJ\-24S\-0\-5SH\-50\_Hirose\-HRS\-FH34SRJ\-24S\-0\-5SH\-50\_C324726\.html
- Role Details: 24\-pin 0\.5mm FPC for Adafruit\-linked 4\.2 inch 300x400 SSD1683 ePaper panel\.
- Manufacturer Name: HRS\(广濑\)
- Part Type: FFC/FPC Connectors
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C324726
- Manufacturer Part Number: FH34SRJ\-24S\-0\.5SH\(50\)
- Package or Case Code: FFC\-SMD\_24P\-P0\.50\_FH34SRJ\-24S\-0\.5SH

**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]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]
- 7 [pin 7]
- 8 [pin 8]
- 9 [pin 9]

### J4 — [U\.FL\-R\-SMT\-1\(10\)](https://flux.ai/jecstronic/upfl-r-smt-110~du.md)

- Role Details: Low\-profile 50 ohm U\.FL connector for LoRa antenna; RF matching/tuning required for final band/antenna
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: U\.FL\-R\-SMT\-1\(10\)
- Datasheet URL: https://media\.digikey\.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3\-302540\-10\.tif\.pdf
- Manufacturer Name: Hirose Electric Co Ltd
- Part Type: Connector
- Role: Antenna Connector

**Pins:**
- Center\_Contact [pin 2]
- Outer\_Contact [pin 1]
- Outer\_Contact [pin 3]

### U1 — [ESP32\-S3\-MINI\-1\-N8](https://flux.ai/lcsc/esp32-s3-mini-1-n8~hi03.md)

- Manufacturer Name: ESPRESSIF\(乐鑫\)
- Symbol Style: parametric\-v1
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2913206\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VXVFVfQlVcVzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- License: https://creativecommons\.org/licenses/by/4\.0/
- Package or Case Code: BULETM\-SMD\_ESP32\-S3\-MINI\-1\-N8
- Role Details: ESP32\-S3 main controller; native USB, SPI, I2C, LoRa and ePaper control\.
- Part Type: WiFi Modules
- LCSC Part Number: C2913206
- Role: MCU Module
- Manufacturer Part Number: ESP32\-S3\-MINI\-1\-N8

**Pins:**
- 3V3 [pin 3]
- EN [pin 45]
- GND [pin 52]
- GND [pin 57]
- GND [pin 43]
- GND [pin 47]
- GND [pin 71]
- GND [pin 56]
- GND [pin 65]
- GND [pin 2]
- GND [pin 48]
- GND [pin 58]
- GND [pin 69]
- GND [pin 60]
- GND [pin 72]
- GND [pin 46]
- GND [pin 63]
- GND [pin 67]
- GND [pin 66]
- GND [pin 59]
- GND [pin 53]
- GND [pin 42]
- GND [pin 73]
- GND [pin 1]
- GND [pin 70]
- GND [pin 55]
- GND [pin 62]
- GND [pin 51]
- GND [pin 49]
- GND [pin 50]
- GND [pin 61]
- GND [pin 54]
- GND [pin 68]
- GND [pin 64]
- IO0 [pin 4]
- IO1 [pin 5]
- IO10 [pin 14]
- IO11 [pin 15]
- IO12 [pin 16]
- IO13 [pin 17]
- IO14 [pin 18]
- IO15 [pin 19]
- IO16 [pin 20]
- IO17 [pin 21]
- IO18 [pin 22]
- IO19 [pin 23]
- IO2 [pin 6]
- IO20 [pin 24]
- IO21 [pin 25]
- IO26 [pin 26]
- IO3 [pin 7]
- IO33 [pin 28]
- IO34 [pin 29]
- IO35 [pin 31]
- IO36 [pin 32]
- IO37 [pin 33]
- IO38 [pin 34]
- IO39 [pin 35]
- IO4 [pin 8]
- IO40 [pin 36]
- IO41 [pin 37]
- IO42 [pin 38]
- IO45 [pin 41]
- IO46 [pin 44]
- IO47 [pin 27]
- IO48 [pin 30]
- IO5 [pin 9]
- IO6 [pin 10]
- IO7 [pin 11]
- IO8 [pin 12]
- IO9 [pin 13]
- RXD0 [pin 40]
- TXD0 [pin 39]

### U2 — [SX1262IMLTRT](https://flux.ai/jecstronic/sx1262imltrt~l3n.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: LoRa Transceiver
- Datasheet URL: https://www\.rfsolutions\.co\.uk/downloads/1537522406DS\_SX1261\-2\_V1\.1\_SEMTECH\.pdf
- Role Details: Bare SX1262 low\-profile LoRa RF IC; requires RF matching and antenna network\.
- Manufacturer Name: Semtech Corporation
- Manufacturer Part Number: SX1262IMLTRT
- Part Type: Integrated Circuit

**Pins:**
- BUSY [pin 14]
- DCC\_SW [pin 9]
- DIO1 [pin 13]
- DIO2 [pin 12]
- DIO3 [pin 6]
- GND\_1 [pin 2]
- GND\_2 [pin 5]
- GND\_3 [pin 8]
- GND\_4 [pin 20]
- GND\_5 [pin 25]
- MISO [pin 16]
- MOSI [pin 17]
- NRESET [pin 15]
- NSS [pin 19]
- RFI\_N [pin 22]
- RFI\_P [pin 21]
- RFO [pin 23]
- SCK [pin 18]
- VBAT [pin 10]
- VBAT\_IO [pin 11]
- VDD\_IN [pin 1]
- VR\_PA [pin 24]
- VREG [pin 7]
- XTA [pin 3]
- XTB [pin 4]

### U3 — [SHT41\-AD1B\-R3](https://flux.ai/adrian95/sht41-ad1b-r3~bec.md)

- Part Type: Sensors
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: SHT41\-AD1B\-R3
- Datasheet URL: https://sensirion\.com/media/documents/33FD6951/67EB9032/HT\_DS\_Datasheet\_SHT4x\_5\.pdf
- Role Details: I2C temperature and humidity sensing\.
- Manufacturer Name: Sensirion
- Role: Environmental Sensor

**Pins:**
- SCL [pin 2]
- SDA [pin 1]
- VDD [pin 3]
- VSS [pin 4]

### U4 — [MCP73871\-2CCI/ML](https://flux.ai/adrian95/mcp73871-2cciml~xz9.md)

- Role: LiPo Charger Power Path
- Datasheet URL: https://ww1\.microchip\.com/downloads/en/DeviceDoc/MCP73871\-Data\-Sheet\-20002090E\.pdf
- Part Type: Integrated Circuit
- Manufacturer Name: Microchip Technology
- Manufacturer Part Number: MCP73871\-2CCI/ML
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: 1S LiPo charging and SYS load\-sharing from 5V input\.

**Pins:**
- \~PG [pin 6]
- \~TE [pin 9]
- CE [pin 17]
- EP [pin 21]
- IN\_1 [pin 18]
- IN\_2 [pin 19]
- OUT\_1 [pin 1]
- OUT\_2 [pin 20]
- PROG1 [pin 13]
- PROG2 [pin 4]
- PROG3 [pin 12]
- SEL [pin 3]
- STAT1/\~LBO [pin 8]
- STAT2 [pin 7]
- THERM [pin 5]
- VBAT\_1 [pin 14]
- VBAT\_2 [pin 15]
- VBAT\_SENSE [pin 16]
- VPCC [pin 2]
- VSS\_1 [pin 10]
- VSS\_2 [pin 11]

### U5 — [TPS63001DRCR](https://flux.ai/adrian95/tps63001drcr~325.md)

- Manufacturer Name: Texas Instruments
- Package or Case Code: TPS74901DRCR
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: 3\.3V Buck\-Boost Regulator
- Role Details: Maintains 3\.3V rail across LiPo discharge for ESP32, LoRa, sensor, and ePaper logic\.
- Manufacturer Part Number: TPS63001DRCR
- Part Type: Integrated Circuit
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps63001\.pdf?ts=1616520267195&ref\_url=https%253A%252F%252Fwww\.ti\.com%252Fstore%252Fti%252Fen%252Fp%252Fproduct%252F%253Fp%253DTPS63001DRCT

**Pins:**
- EN [pin 6]
- EP [pin EP1]
- FB [pin 10]
- GND [pin 9]
- L1 [pin 4]
- L2 [pin 2]
- PGND [pin 3]
- PS/SYNC [pin 7]
- VIN [pin 5]
- VINA [pin 8]
- VOUT [pin 1]

### U6 — [MAX17048G\+T10](https://flux.ai/lcsc/max17048gplust10~jvyd.md)

- Manufacturer Name: MAXIM
- Manufacturer Part Number: MAX17048G\+T10
- LCSC Part Number: C2682616
- Package or Case Code: DFN\-8\_L2\.0\-W2\.0\-P0\.50\-BL\-EP
- Role: Fuel Gauge
- Role Details: Battery\-side MAX17048 SOC measurement over I2C\.
- Datasheet URL: https://www\.analog\.com/media/en/technical\-documentation/data\-sheets/MAX17048\-MAX17049\.pdf
- Part Type: Battery Management ICs
- Symbol Style: parametric\-v1
- JLCPCB Part Class: Extended Part

**Pins:**
- \~\{ALRT\} [pin 5]
- CELL [pin 2]
- CTG [pin 1]
- EP [pin 9]
- GND [pin 4]
- QSTRT [pin 6]
- SCL [pin 7]
- SDA [pin 8]
- VDD [pin 3]

### U7 — [MP5075L](https://flux.ai/monolithicpower/mp5075l~lc.md)

- Product Image Url: https://www\.monolithicpower\.com/pub/media/catalog/product/M/P/MP5075L\_483\_1\.jpg
- Product Info Url: https://www\.monolithicpower\.com/en/catalog/product/view/id/483?utm\_source=ultralibrarian&utm\_medium=component\_search&utm\_campaign=listing
- Manufacturer Part Number: MP5075L
- Package or Case Code: SOT563\_MP5075L\_MNP
- Manufacturer Name: Monolithic Power Systems
- Role Details: Firmware\-controlled switched 3\.3V rail for ePaper power domain\.
- Role: Load Switch
- Datasheet URL: https://www\.monolithicpower\.com/en/documentview/productdocument/index/version/2/document\_type/Datasheet/lang/en/sku/MP5075L

**Pins:**
- EN [pin 5]
- GND [pin 4]
- NC [pin 6]
- NC [pin 1]
- VIN [pin 2]
- VOUT [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/jkorenzvit/esp32\-s3\-lora\-epaper\-sensor\~gf](https://flux.ai/jkorenzvit/esp32-s3-lora-epaper-sensor~gf).*

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*Generated from [https://flux\.ai/jkorenzvit/esp32\-s3\-lora\-epaper\-sensor\~gf](https://flux.ai/jkorenzvit/esp32-s3-lora-epaper-sensor~gf)*