# Meshtastic Low Power ## Description Meshtastic ESP32-S3 node with 5 V input, 3.3V low-noise regulation, and I2C expansion. ## Project Details - **Owner:** vasyl - **Created:** 4/8/2026 - **Last Updated:** 4/27/2026 - **Visibility:** Public ## 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://www.flux.ai/adrian95/esp32-s3fh4r2~9t2.md) - Manufacturer Name: Espressif Systems - Part Type: Integrated Circuit - Manufacturer Part Number: ESP32-S3FH4R2 - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf - License: https://creativecommons.org/licenses/by/4.0/ **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://www.flux.ai/jecstronic/typec-304-bcp16~7f.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/2202140030_XUNPU-TYPEC-304-BCP16_C720629.pdf - Manufacturer Part Number: TYPEC-304-BCP16 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: XUNPU **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://www.flux.ai/adrian95/sm02b-srss-tblfsn~zzs.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: SM02BSRSSTBLFSN - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/eSH.pdf - Part Type: Connector - Manufacturer Part Number: SM02B-SRSS-TB(LF)(SN) - Manufacturer Name: JST Sales America Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] - MP1 [pin 3] - MP2 [pin 4] ### J3 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110~du.md) - 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 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: Hirose Electric Co Ltd **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### LED1 — [LED-0402-Template](https://www.flux.ai/vasy_skral/led-0402-template~zvz.md) - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED-0402-Template](https://www.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://www.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://www.flux.ai/corynrobinson/small-spst-no-tactile-switch~vq.md) - Part Type: Switch - Manufacturer Part Number: KMR421NGLFS - Datasheet URL: https://octopart.com/datasheet/kmr421nglfs-c%26k+components-7226706 - Manufacturer Name: C&K Components **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] ### S2 — [Small SPST-NO Tactile Switch](https://www.flux.ai/corynrobinson/small-spst-no-tactile-switch~vq.md) - Part Type: Switch - Manufacturer Part Number: KMR421NGLFS - Manufacturer Name: C&K Components - Datasheet URL: https://octopart.com/datasheet/kmr421nglfs-c%26k+components-7226706 **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] ### U1 — [CP2102N-A02-GQFN20](https://www.flux.ai/vasyl/cp2102n-a02-gqfn20~q3n.md) - Datasheet URL: https://www.silabs.com/documents/public/data-sheets/cp2102n-datasheet.pdf - Manufacturer Name: SILICON LABS - Manufacturer Part Number: CP2102N-A02-GQFN20 - Part Type: Microcontroller **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://www.flux.ai/jecstronic/tp4054-42-sot25r~3re.md) - Manufacturer Name: TOPPOWER(Nanjing Extension Microelectronics) - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809261814_TOPPOWER-Nanjing-Extension-Microelectronics-TP4054-42-SOT25R_C32574.pdf - Manufacturer Part Number: TP4054-42-SOT25R - Part Type: Battery Management **Pins:** - BAT - CHRG - GND - PROG - VCC ### U3 — [ME6217C33M5G](https://www.flux.ai/lcsc/me6217c33m5g~v8qx.md) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_Nanjing-Micro-One-Elec-ME6217C33M5G_C427602.html - Max Input Voltage: 7V - Dropout Voltage: 180mV - Manufacturer Name: MICRONE(南京微盟) - Package or Case Code: SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR - Manufacturer Part Number: ME6217C33M5G - Output Current: 800mA - Max Output Voltage: 3.3V - Part Type: Linear Voltage Regulators (LDO) - LCSC Part Number: C427602 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912111437_MICRONE-Nanjing-Micro-One-Elec-ME6217C33M5G_C427602.pdf **Pins:** - CE [pin 3] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] - VSS [pin 2] ### U4 — [UG-2864HSWEG01](https://www.flux.ai/vasyl/ug-2864hsweg01~6at.md) - Manufacturer Name: WISECHIP SEMICONDUCTOR INC - Part Type: OLED - Manufacturer Part Number: UG-2864HSWEG01 - Datasheet URL: https://cdn-shop.adafruit.com/datasheets/UG-2864HSWEG01.pdf **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://www.flux.ai/vasyl/lr1121imltrt~nv9.md) - Datasheet URL: https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/3n000000vByp/PdIx6QpZ_oZmdRVW2iW.ciZPBKY8nZLQpybO9K0Bo.s - Manufacturer Part Number: LR1121IMLTRT - Manufacturer Name: Semtech - Part Type: Integrated Circuits **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://www.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://www.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://www.flux.ai/vasyl/meshtastic-low-power~qh](https://www.flux.ai/vasyl/meshtastic-low-power~qh).* --- *Generated from [https://www.flux.ai/vasyl/meshtastic-low-power~qh](https://www.flux.ai/vasyl/meshtastic-low-power~qh)*