# RF Energy Harvesting IoT Sensor Node ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** omertopbas - **Created:** 3/28/2026 - **Last Updated:** 4/8/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD A[SMA Edge Mount Antenna Input] --> B[Pi Matching Network] B --> C[Schottky RF Rectifier] C --> D[Energy Storage Rail] D --> E[TP4056 Charger] E --> F[JST PH 2.0 LiPo Battery] F --> G[3.3V Ultra Low IQ LDO] F --> H[5V Boost Converter] D --> I[1F 5.5V Supercapacitor] G --> J[ESP32 S3 WROOM] H --> K[MH Z14A 7 Pin Header] J -->|UART| K J -->|PWM| K J -->|I2C SPI GPIO| L[Expansion and Control] M[EN and BOOT Switches] --> J ``` - **Stars:** 1 ## Key Components ### D1 — [BAS70-05,215](https://www.flux.ai/lcsc/bas70-05c215~tw49.md) - Manufacturer Name: Nexperia(安世) - Package: SOT-23-3 - Manufacturer Part Number: BAS70-05,215 - LCSC Part Number: C194653 - Role: RF Rectifier - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Others_Nexperia_BAS70-05-215_Nexperia-BAS70-05-215_C194653.html - Part Type: Schottky Barrier Diodes (SBD) - Role Details: Dual Schottky diode RF rectifier after Pi matching network - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1811141223_Nexperia-BAS70-05-215_C194653.pdf - Implementation Details: BAS70-05 common cathode pair used as placeholder RF rectifier until exact HSMS-286x family part is available **Pins:** - A [pin 1] - A [pin 2] - C [pin 3] ### IC1 — [TLV75533PDBVR](https://www.flux.ai/adrian95/tlv75533pdbvr~jy8.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftlv733p - Package: SOT-23-5 - Role: 3.3V Regulation - Part Type: Integrated Circuit - Manufacturer Part Number: TLV75533PDBVR - Role Details: Low quiescent current 3.3V LDO supplying ESP32-S3-WROOM from battery rail - Manufacturer Name: Texas Instruments - Package or Case Code: SOT95P280X145-5N - License: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftlv755p **Pins:** - BP [pin 4] - EN [pin 3] - GND [pin 2] - VIN [pin 1] - VOUT [pin 5] ### IC2 — [ESP32-S3-WROOM-1-N16R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n16r8~fs1.md) - Implementation Details: EN pulled up with 10k and reset switch to GND; GPIO0 pulled up with 10k and BOOT switch to GND; GPIO4 drives programmable status LED; I2C on IO8/IO9; UART0 on TXD0/RXD0 to MH-Z14A header - Role: Main MCU - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.mouser.com/datasheet/2/891/esp32_s3_wroom_1_wroom_1u_datasheet_en-2930317.pdf - Part Type: Module - Manufacturer Part Number: ESP32-S3-WROOM-1-N16R8 - Package: ESP32-S3-WROOM Module - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: ESP32-S3-WROOM module handling control, UART/SPI/I2C, and IoT connectivity **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND_1 [pin 1] - GND_10 [pin 48] - GND_11 [pin 49] - GND_2 [pin 40] - GND_3 [pin 41] - GND_4 [pin 42] - GND_5 [pin 43] - GND_6 [pin 44] - GND_7 [pin 45] - GND_8 [pin 46] - GND_9 [pin 47] - IO0 [pin 27] - IO1 [pin 39] - IO10 [pin 18] - IO11 [pin 19] - IO12 [pin 20] - IO13 [pin 21] - IO14 [pin 22] - IO15 [pin 8] - IO16 [pin 9] - IO17 [pin 10] - IO18 [pin 11] - IO19 [pin 13] - IO2 [pin 38] - IO20 [pin 14] - IO21 [pin 23] - IO3 [pin 15] - IO35 [pin 28] - IO36 [pin 29] - IO37 [pin 30] - IO38 [pin 31] - IO39 [pin 32] - IO4 [pin 4] - IO40 [pin 33] - IO41 [pin 34] - IO42 [pin 35] - IO45 [pin 26] - IO46 [pin 16] - IO47 [pin 24] - IO48 [pin 25] - IO5 [pin 5] - IO6 [pin 6] - IO7 [pin 7] - IO8 [pin 12] - IO9 [pin 17] - RXD0 [pin 36] - TXD0 [pin 37] ### J1 — [SMA-J-P-H-ST-EM1](https://www.flux.ai/jecstronic/sma-j-p-h-st-em1~0a1.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SMA-J-P-H-ST-EM1 - Role: RF Input - Manufacturer Name: Samtec Inc. - Part Type: Connector - Package: Board Edge SMA - Datasheet URL: http://suddendocs.samtec.com/catalog_english/sma.pdf - Role Details: Edge-mount SMA connector feeding 50 ohm RF path into matching network **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - Role: Battery Connector - Part Type: Connector - Role Details: JST-PH 2.0 connector for single-cell LiPo battery - Manufacturer Name: JST Sales America Inc. - Package: JST-PH-2-SMD **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [HTSW-107-07-G-S](https://www.flux.ai/adrian95/htsw-107-07-g-s~kpt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Connector Rows: 1 - Manufacturer Part Number: HTSW-107-07-G-S - Part Type: Connector - Connector Type: Headers and Wire Housings - Connector Pitch: 2.54mm - Manufacturer Name: SAMTEC - Implementation Details: Pin 1=5V, Pin 2=GND, Pin 3=UART TX to sensor RX, Pin 4=UART RX from sensor TX, Pin 5=PWM, Pin 6=SPI_MOSI/GPIO option, Pin 7=SPI_SCK/GPIO option - Datasheet URL: http://www.farnell.com/datasheets/1992055.pdf?_ga=2.196729640.569325269.1503285096-1413671594.1503025027 - Connector Gender: Male - Connector Positions: 7 - Role Details: Header interface for MH-Z14A 5V CO2 sensor with UART and PWM pins - Package: 1x07 2.54mm THT - Role: Sensor Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] ### LED1 — [LTST-C190KRKT](https://www.flux.ai/adrian95/ltst-c190krkt~3pw.md) - Package: 0603 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0151/LTST-C190KRKT.pdf - Manufacturer Name: Lite-On Inc. - Role: Status LED - Manufacturer Part Number: LTST-C190KRKT - Role Details: Charging indicator LED for TP4056 ~CHRG output **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [SML-D13FWT86C](https://www.flux.ai/jecstronic/sml-d13fwt86c~i2q.md) - Manufacturer Part Number: SML-D13FWT86C - Role: Status LED - Part Type: LED - Datasheet URL: https://fscdn.rohm.com/en/products/databook/datasheet/opto/led/chip_mono/sml-d13fwt86(c)-e.pdf - Package: 0603 - Manufacturer Name: Rohm Semiconductor - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Charge complete indicator LED for TP4056 ~STDBY output **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LTST-C190TBKT](https://www.flux.ai/adrian95/ltst-c190tbkt~9us.md) - Role Details: Programmable ESP32-S3 status LED on GPIO4 - License: https://creativecommons.org/licenses/by/4.0/ - Package: 0603 - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0224/LTST-C190TBKT.PDF - Part Type: LED - Role: Status LED - Manufacturer Name: Lite-On Inc. - Manufacturer Part Number: LTST-C190TBKT **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [1571563-8](https://www.flux.ai/vasy_skral/1571563-8~oj.md) - Role: User Switch - Role Details: ESP32 control switch used for EN reset or BOOT strap - Part Type: Switch - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308111-1_SWITCHES_CORE_PROGRAM_CATALOG&DocType=CS&DocLang=English - Package: 6mm SMD Tact - Manufacturer Part Number: 1571563-8 - Manufacturer Name: TE Connectivity ALCOSWITCH Switches **Pins:** - ~ [pin 3] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] ### SW2 — [1571563-8](https://www.flux.ai/vasy_skral/1571563-8~oj.md) - Manufacturer Name: TE Connectivity ALCOSWITCH Switches - Manufacturer Part Number: 1571563-8 - Role Details: ESP32 control switch used for EN reset or BOOT strap - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308111-1_SWITCHES_CORE_PROGRAM_CATALOG&DocType=CS&DocLang=English - Part Type: Switch - Package: 6mm SMD Tact - Role: User Switch **Pins:** - ~ [pin 3] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] ### U1 — [TP4056](https://www.flux.ai/vasy_skral/tp4056~xa.md) - Datasheet URL: https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf - Role Details: TP4056 standalone charger configured for about 60mA charge current - License: https://creativecommons.org/licenses/by/4.0/ - Implementation Details: TEMP and CE tied high to keep charger enabled; ~CHRG and ~STDBY drive external status LEDs to indicate charging and standby states - Package: SOP-8 - Manufacturer Name: NanJing Top Power ASIC Corp. - Part Type: Integrated Circuit - Role: Battery Charger - Manufacturer Part Number: TP4056 **Pins:** - ~CHRG [pin 7] - ~STDBY [pin 6] - BAT [pin 5] - CE [pin 8] - EP [pin 9] - GND [pin 3] - PROG [pin 2] - TEMP [pin 1] - VCC [pin 4] ### U2 — [MT3608 - 4414693](https://www.flux.ai/kicad-part-library/mt3608-4414693~ao3.md) - Role: 5V Boost - Manufacturer Part Number: MT3608 - Role Details: Step-up converter generating exact 5.0V rail for MH-Z14A with 150mA peak support - Package or Case Code: SOT-23-6 - Package: SOT-23-6 - Datasheet URL: https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf **Pins:** - EN [pin 4] - FB [pin 3] - GND [pin 2] - IN [pin 5] - NC [pin 6] - SW [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/omertopbas/rf-energy-harvesting-iot-sensor-node~xm](https://www.flux.ai/omertopbas/rf-energy-harvesting-iot-sensor-node~xm).* --- *Generated from [https://www.flux.ai/omertopbas/rf-energy-harvesting-iot-sensor-node~xm](https://www.flux.ai/omertopbas/rf-energy-harvesting-iot-sensor-node~xm)*