# Meshtastic Low Power

## Description

Meshtastic ESP32\-S3 node with 5 V input, 3\.3V low\-noise regulation, and I2C expansion\.

## Project Details

- **Owner:** dacre
- **Created:** 9/8/2026
- **Last Updated:** 9/8/2026
- **Visibility:** Public
- **Copies:** 1

## Key Components

### ANT1 — PCB Antenna

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Antenna

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

### IC1 — [ESP32\-S3FH4R2](https://flux.ai/adrian95/esp32-s3fh4r2~9t2.md)

- Manufacturer Name: Espressif Systems
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Integrated Circuit
- Manufacturer Part Number: ESP32\-S3FH4R2
- Datasheet URL: https://www\.espressif\.com/sites/default/files/documentation/esp32\-s3\_datasheet\_en\.pdf

**Pins:**
- CHIP\_PU [pin 4]
- EP [pin 57]
- GPIO0 [pin 5]
- GPIO1 [pin 6]
- GPIO10 [pin 15]
- GPIO11 [pin 16]
- GPIO12 [pin 17]
- GPIO13 [pin 18]
- GPIO14 [pin 19]
- GPIO17 [pin 23]
- GPIO18 [pin 24]
- GPIO19 [pin 25]
- GPIO2 [pin 7]
- GPIO20 [pin 26]
- GPIO21 [pin 27]
- GPIO3 [pin 8]
- GPIO33 [pin 38]
- GPIO34 [pin 39]
- GPIO35 [pin 40]
- GPIO36 [pin 41]
- GPIO37 [pin 42]
- GPIO38 [pin 43]
- GPIO4 [pin 9]
- GPIO45 [pin 51]
- GPIO46 [pin 52]
- GPIO5 [pin 10]
- GPIO6 [pin 11]
- GPIO7 [pin 12]
- GPIO8 [pin 13]
- GPIO9 [pin 14]
- LNA\_IN [pin 1]
- MTCK [pin 44]
- MTDI [pin 47]
- MTDO [pin 45]
- MTMS [pin 48]
- SPICLK [pin 33]
- SPICLK\_N [pin 36]
- SPICLK\_P [pin 37]
- SPICS0 [pin 32]
- SPICS1 [pin 28]
- SPID [pin 35]
- SPIHD [pin 30]
- SPIQ [pin 34]
- SPIWP [pin 31]
- U0RXD [pin 50]
- U0TXD [pin 49]
- VDD\_SPI [pin 29]
- VDD3P3\_1 [pin 2]
- VDD3P3\_2 [pin 3]
- VDD3P3\_CPU [pin 46]
- VDD3P3\_RTC [pin 20]
- VDDA\_1 [pin 55]
- VDDA\_2 [pin 56]
- XTAL\_32K\_N [pin 22]
- XTAL\_32K\_P [pin 21]
- XTAL\_N [pin 53]
- XTAL\_P [pin 54]

### J1 — [TYPEC\-304\-BCP16](https://flux.ai/jecstronic/typec-304-bcp16~7f.md)

- Manufacturer Part Number: TYPEC\-304\-BCP16
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/2202140030\_XUNPU\-TYPEC\-304\-BCP16\_C720629\.pdf
- Part Type: Connector
- Manufacturer Name: XUNPU
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND [pin 15]
- GND [pin 14]
- GND [pin 13]
- GND [pin B1A12]
- GND [pin 16]
- GND [pin A1B12]
- SBU1 [pin A8]
- SBU2 [pin B8]
- VBUS [pin A4B9]
- VBUS [pin B4A9]

### J2 — [SM02B\-SRSS\-TB\(LF\)\(SN\)](https://flux.ai/adrian95/sm02b-srss-tblfsn~zzs.md)

- Manufacturer Name: JST Sales America Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: SM02B\-SRSS\-TB\(LF\)\(SN\)
- Part Type: Connector
- Package or Case Code: SM02BSRSSTBLFSN
- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/eSH\.pdf

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- MP1 [pin 3]
- MP2 [pin 4]

### J3 — [U\.FL\-R\-SMT\-1\(10\)](https://flux.ai/jecstronic/upfl-r-smt-110~du.md)

- 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

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

### LED1 — [LED\-0402\-Template](https://flux.ai/vasy_skral/led-0402-template~zvz.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: LED

**Pins:**
- A [pin 2]
- K [pin 1]

### LED2 — [LED\-0402\-Template](https://flux.ai/vasy_skral/led-0402-template~zvz.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: LED

**Pins:**
- A [pin 2]
- K [pin 1]

### LED3 — [LED\-0402\-Template](https://flux.ai/vasy_skral/led-0402-template~zvz.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: LED

**Pins:**
- A [pin 2]
- K [pin 1]

### S1 — [Small SPST\-NO Tactile Switch](https://flux.ai/corynrobinson/small-spst-no-tactile-switch~vq.md)

- Manufacturer Name: C&K Components
- Manufacturer Part Number: KMR421NGLFS
- Datasheet URL: https://octopart\.com/datasheet/kmr421nglfs\-c%26k\+components\-7226706
- Part Type: Switch

**Pins:**
- P1 [pin 1]
- P2 [pin 2]
- P3 [pin 3]
- P4 [pin 4]

### S2 — [Small SPST\-NO Tactile Switch](https://flux.ai/corynrobinson/small-spst-no-tactile-switch~vq.md)

- Manufacturer Name: C&K Components
- Manufacturer Part Number: KMR421NGLFS
- Datasheet URL: https://octopart\.com/datasheet/kmr421nglfs\-c%26k\+components\-7226706
- Part Type: Switch

**Pins:**
- P1 [pin 1]
- P2 [pin 2]
- P3 [pin 3]
- P4 [pin 4]

### U1 — [CP2102N\-A02\-GQFN20](https://flux.ai/vasyl/cp2102n-a02-gqfn20~q3n.md)

- Manufacturer Name: SILICON LABS
- Datasheet URL: https://www\.silabs\.com/documents/public/data\-sheets/cp2102n\-datasheet\.pdf
- Part Type: Microcontroller
- Manufacturer Part Number: CP2102N\-A02\-GQFN20
- Symbol Style: parametric\-v1

**Pins:**
- \~CTS [pin 15]
- \~RTS [pin 16]
- \~RXT\~/GPIO\.3 [pin 19]
- \~SUSPEND [pin 11]
- \~TXT\~/GPIO\.2 [pin 20]
- \~WAKEUP [pin 13]
- CLK/GPIO\.0 [pin 2]
- D\- [pin 5]
- D\+ [pin 4]
- GND [pin 12]
- GND [pin 21]
- GND [pin 3]
- NC [pin 10]
- RS485/GPIO\.1 [pin 1]
- RXD [pin 9]
- RXD [pin 17]
- SUSPEND [pin 14]
- TXD [pin 18]
- USB [pin 8]
- VDD [pin 6]
- VREGIN [pin 7]

### U2 — [TP4054\-42\-SOT25R](https://flux.ai/jecstronic/tp4054-42-sot25r~3re.md)

- Manufacturer Part Number: TP4054\-42\-SOT25R
- Part Type: Battery Management
- Manufacturer Name: TOPPOWER\(Nanjing Extension Microelectronics\)
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1809261814\_TOPPOWER\-Nanjing\-Extension\-Microelectronics\-TP4054\-42\-SOT25R\_C32574\.pdf

**Pins:**
- BAT
- CHRG
- GND
- PROG
- VCC

### U3 — [ME6217C33M5G](https://flux.ai/lcsc/me6217c33m5g~v8qx.md)

- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1912111437\_MICRONE\-Nanjing\-Micro\-One\-Elec\-ME6217C33M5G\_C427602\.pdf
- Output Current: 800mA
- Manufacturer Name: MICRONE\(南京微盟\)
- Max Output Voltage: 3\.3V
- LCSC Part Number: C427602
- Product Info Url: https://lcsc\.com/product\-detail/Low\-Dropout\-Regulators\-LDO\_Nanjing\-Micro\-One\-Elec\-ME6217C33M5G\_C427602\.html
- Max Input Voltage: 7V
- Package or Case Code: SOT\-23\-5\_L3\.0\-W1\.7\-P0\.95\-LS2\.8\-BR
- Part Type: Linear Voltage Regulators \(LDO\)
- Manufacturer Part Number: ME6217C33M5G
- Dropout Voltage: 180mV
- JLCPCB Part Class: Extended Part

**Pins:**
- CE [pin 3]
- NC [pin 4]
- VIN [pin 1]
- VOUT [pin 5]
- VSS [pin 2]

### U4 — [UG\-2864HSWEG01](https://flux.ai/vasyl/ug-2864hsweg01~6at.md)

- Manufacturer Name: WISECHIP SEMICONDUCTOR INC
- Datasheet URL: https://cdn\-shop\.adafruit\.com/datasheets/UG\-2864HSWEG01\.pdf
- Manufacturer Part Number: UG\-2864HSWEG01
- Part Type: OLED 

**Pins:**
- /CS
- /RES
- BS0
- BS1
- BS2
- C1N
- C1P
- C2N
- C2P
- D/C
- D0/DI
- D1/SCLK
- D2
- D3
- D4
- D5
- D6
- D7
- E/RD
- IREF
- MT
- MT2
- NC
- R/W
- VBAT
- VCC
- VCOMH
- VDD
- VLSS
- VSS

### U5 — [LR1121IMLTRT](https://flux.ai/vasyl/lr1121imltrt~nv9.md)

- Manufacturer Name: Semtech
- Part Type: Integrated Circuits
- Manufacturer Part Number: LR1121IMLTRT
- Datasheet URL: https://semtech\.my\.salesforce\.com/sfc/p/\#E0000000JelG/a/3n000000vByp/PdIx6QpZ\_oZmdRVW2iW\.ciZPBKY8nZLQpybO9K0Bo\.s

**Pins:**
- \~\{RESET\} [pin 6]
- 32K\_N/DIO10 [pin 8]
- 32K\_P/DIO11 [pin 7]
- DCC\_SW [pin 14]
- DIO0/BUSY [pin 25]
- DIO1 [pin 24]
- DIO2 [pin 23]
- DIO3 [pin 22]
- DIO4 [pin 21]
- DIO5 [pin 20]
- DIO6 [pin 19]
- DIO7 [pin 11]
- DIO8 [pin 10]
- DIO9 [pin 9]
- DNC [pin 16]
- DNC\_\_1 [pin 17]
- DNC\_\_2 [pin 18]
- DNC\_\_3 [pin 27]
- DNC\_\_4 [pin 28]
- GND [pin 13]
- GND\_\_1 [pin 33]
- RFI\_N\_LF0 [pin 29]
- RFI\_P\_LF0 [pin 30]
- RFIO\_HF [pin 26]
- RFO\_HP\_LF [pin 32]
- RFO\_LP\_LF [pin 31]
- VBAT [pin 15]
- VBAT\_RF [pin 2]
- VR\_PA [pin 1]
- VREG [pin 12]
- VTCXO [pin 3]
- XTA [pin 4]
- XTB [pin 5]

### X1 — [Crystal SMD\-2016](https://flux.ai/vasyl/crystal-smd-2016~e1o.md)

- Part Type: Oscillator

**Pins:**
- P1 [pin 1]
- P2 [pin 2]
- P3 [pin 3]
- P4 [pin 4]

### X2 — [Crystal SMD\-2016](https://flux.ai/vasyl/crystal-smd-2016~e1o.md)

- Part Type: Oscillator

**Pins:**
- P1 [pin 1]
- P2 [pin 2]
- P3 [pin 3]
- P4 [pin 4]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/dacre/meshtastic\-low\-power\~shh](https://flux.ai/dacre/meshtastic-low-power~shh).*

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*Generated from [https://flux\.ai/dacre/meshtastic\-low\-power\~shh](https://flux.ai/dacre/meshtastic-low-power~shh)*