# Important Blush Power Laces ## Description ESP12F IoT Node with SIM800L Cellular, MT3608/AMS1117 Power, SPI Flash, I2S Audio, USB-C UART, and Li-Ion Management ## Project Details - **Owner:** devstat - **Created:** 12/16/2025 - **Last Updated:** 12/16/2025 - **Visibility:** Public - **Domain:** Consumer Electronics - **License:** https://creativecommons.org/licenses/by/4.0/ - **Power Architecture Notes:** Single-cell Li-Ion via TP4056 charger and DW01A+8205A protection, boosted by MT3608 to ~5V, then regulated to 3.3V by AMS1117-3.3 to supply ESP-12F, SIM800L, W25Q128JV, MAX98357A, and CH340C. - **Connectivity:** WiFi, Cellular, USB - **Software:** Arduino - **Power Requirements:** Battery - **System Architecture:** flowchart TD Battery((Battery)) Battery --> TP4056["TP4056 Charger"] TP4056 --> Protection["DW01A + 8205A Protection"] Protection --> MT3608["MT3608 Boost Converter"] MT3608 --> AMS1117["AMS1117-3.3 LDO"] AMS1117 --> VCC3V3((("3.3V Rail"))) VCC3V3 --> ESP["ESP-12F"] VCC3V3 --> SIM800L["SIM800L Module"] VCC3V3 --> FLASH["W25Q128JV SPI Flash"] VCC3V3 --> AUDIO["MAX98357A Audio Amp"] VCC3V3 --> CH340C["CH340C USB-UART"] SIM800L --> UFL["U.FL Antenna"] - **Manufacturing Quantity Target:** 10 ## Key Components ### D1 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Freewheeling diode for boost converter - Manufacturer Name: Slkor(SLKORMICRO Elec.) - Manufacturer Part Number: SS14 - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - Package: D_SMA - Role: Flyback / Freewheeling - Part Type: Diode **Pins:** - Anode [pin A] - Cathode [pin C] ### J1 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-20-6pin~wh.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf - Manufacturer Name: CIKI - Role: Power Source - Role Details: Charge-only USB-C port - Part Type: Connector - Manufacturer Part Number: Type-C-2.0-6Pin **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - Part Type: Connector - Role: Power Source - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Battery connector for LiPo - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [SIM8051-6-0-14-00-A](https://www.flux.ai/adrian95/sim8051-6-0-14-00-a~2xb.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/GCT%20PDFs/SIM8051_Spec.pdf - Role Details: SIM card interface - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: GCT - Manufacturer Part Number: SIM8051-6-0-14-00-A - Role: Interface **Pins:** - CLK [pin C3] - GND [pin C5] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### J4 — [Generic 3.5mm Audio Stereo Jack](https://www.flux.ai/jharwinbarrozo/generic-3p5mm-audio-stereo-jack~0a.md) - Role Details: Speaker output connector - Role: Interface - Part Type: Connector **Pins:** - GND [pin 2] - L [pin 1] - R [pin 3] ### J5 — [U.FL-R-SMT(01)](https://www.flux.ai/adrian95/upfl-r-smt01~ap.md) - Manufacturer Name: Hirose Electric Co Ltd - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2607/UFL%20Series.pdf - Role Details: Antenna connector - Role: RF Tuning / Matching - Manufacturer Part Number: U.FL-R-SMT(01) **Pins:** - GND [pin 2] - GND [pin 1] - SIG [pin 3] ### SW1 — [KSC341GLFS](https://www.flux.ai/adrian95/ksc341glfs~fb0.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ckswitches.com/media/1969/ksc3.pdf - Manufacturer Part Number: KSC341GLFS - Role Details: User buttons - Part Type: Switch - Role: Debouncing - Manufacturer Name: C&K **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - NO_1 [pin 3] - NO_2 [pin 4] ### SW2 — [KSC341GLFS](https://www.flux.ai/adrian95/ksc341glfs~fb0.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: KSC341GLFS - Datasheet URL: https://www.ckswitches.com/media/1969/ksc3.pdf - Role: Debouncing - Role Details: User buttons - Manufacturer Name: C&K - Part Type: Switch **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - NO_1 [pin 3] - NO_2 [pin 4] ### U1 — [ESP-12F fZ1a](https://www.flux.ai/f-franzin/esp-12f-fz1a~bo.md) - Manufacturer Name: Ai-Thinker - Frequency: 80/160MHz - Package or Case Code: smd22 - Current: 80mA - Role: Modulation / Demodulation - Operating Voltage: 3.3V - Role Details: ESP-12F Wi-Fi and MCU module - Manufacturer Part Number: ESP-12F - Part Type: Microcontroller **Pins:** - ADC [pin 2] - CS0 [pin 9] - EN [pin 3] - GND [pin 15] - GPIO0 [pin 18] - GPIO12 [pin 6] - GPIO13 [pin 7] - GPIO14 [pin 5] - GPIO15 [pin 16] - GPIO16 [pin 4] - GPIO2 [pin 17] - GPIO4 [pin 19] - GPIO5 [pin 20] - IO10 [pin 12] - IO9 [pin 11] - MISO [pin 10] - MOSI [pin 13] - RST [pin 1] - RXD [pin 21] - SCLK [pin 14] - TXD [pin 22] - VCC [pin 8] ### U2 — [MT3608L](https://www.flux.ai/lcsc/mt3608l~l8nc.md) - Frequency: 1.2Hz - Role Details: Boost converter for battery to 4.0 V rail - Manufacturer Part Number: MT3608L - Logic Function: Voltage Boosting - IC Type: DC-DC Boost Converter - Role: Power Conversion - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL_3 - Package: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL_3 - LCSC Part Number: C2932326 - Power Consumtion: 1.2 mA (load-dependent) - Manufacturer Name: 西安航天民芯 - Operating Voltage: Input: 2V to 24V Output: Adjustable, 5V to 28V - Part Type: DC-DC Converters - JLCPCB Part Class: Extended Part **Pins:** - EN [pin 4] - FB [pin 3] - GND [pin 2] - OC [pin 6] - SW [pin 1] - VIN [pin 5] ### U2 — [TPS61021ADSGR](https://www.flux.ai/tonylin/tps61021adsgr~ra.md) - Manufacturer Part Number: TPS61021ADSGR - Role: Power Conversion - Role Details: Boost converter for battery to 4.0 V rail - Manufacturer Name: Texas Instruments Inc. **Pins:** - AGND [pin 1] - EN [pin 5] - FB [pin 2] - PGND [pin 9] - SW_1 [pin 6] - SW_2 [pin 7] - VIN [pin 8] - VOUT_1 [pin 3] - VOUT_2 [pin 4] ### U3 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33~34.md) - Part Type: Integrated Circuit - Datasheet URL: http://www.advanced-monolithic.com/pdf/ds1117.pdf - Manufacturer Name: AMS - Symbol Style: Parametric - Role: Linear Regulator - Role Details: 3.3V LDO regulator for 3.3V rail - Manufacturer Part Number: AMS1117-3.3 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### U3 — [MIC5504-3.3YM5](https://www.flux.ai/kicad-part-library/mic5504-3p3ym5~ud0.md) - Manufacturer Name: Microchip Technology Inc. - Package or Case Code: SOT-23-5 - Package: SOT-23-5 - Role Details: 3.3 V LDO regulator for ESP-12F rail - Datasheet URL: http://ww1.microchip.com/downloads/en/DeviceDoc/MIC550X.pdf - Role: Power Conversion - Manufacturer Part Number: MIC5504-3.3YM5 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U4 — [SIM800L Module](https://www.flux.ai/adrian95/sim800l-module~ja6.md) - Role: RF Transceiver - Manufacturer Part Number: SIM800L - Datasheet URL: https://components101.com/sites/default/files/component_datasheet/SIM800L-Datasheet.pdf - Part Type: Module - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Cellular modem module for 2G/GPRS connectivity - Manufacturer Name: Simcom **Pins:** - DTR [pin 11] - GND [pin 6] - MIC- [pin 9] - MIC+ [pin 10] - NET [pin 1] - RING [pin 12] - RST [pin 3] - RXD [pin 4] - SPK- [pin 7] - SPK+ [pin 8] - TXD [pin 5] - VCC [pin 2] ### U5 — [W25Q128JVSIQ](https://www.flux.ai/jecstronic/w25q128jvsiq~tqj.md) - Role Details: SPI Flash memory for external storage on ESP-12F SPI bus - Part Type: Integrated Circuit - Manufacturer Name: Winbond Electronics - Manufacturer Part Number: W25Q128JVSIQ - Package: SOIC-8_L5.3-W5.3-P1.27-LS8.0-BL - Role: Integrated Circuit - Datasheet URL: https://www.winbond.com/resource-files/W25Q128JV%20RevI%2008232021%20Plus.pdf **Pins:** - ~CS [pin 1] - CLK [pin 6] - DI(IO0) [pin 5] - DO(IO1) [pin 2] - GND [pin 4] - IO2 [pin 3] - IO3 [pin 7] - VCC [pin 8] ### U6 — [MAX98357AETE+T](https://www.flux.ai/adrian95/max98357aeteplust~wk.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MAX98357AETE+T - Part Type: Integrated Circuit - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/max98357a-max98357b.pdf - Role: Amplification - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Role Details: I2S audio amplifier for part U1, pins SD, SCK, LRCK **Pins:** - ~SD_MODE [pin 4] - BCLK [pin 16] - DIN [pin 1] - GAIN_SLOT [pin 2] - GND_1 [pin 3] - GND_2 [pin 11] - GND_3 [pin 15] - LRCLK [pin 14] - N.C._1 [pin 5] - N.C._2 [pin 6] - N.C._3 [pin 12] - N.C._4 [pin 13] - OUTN [pin 10] - OUTP [pin 9] - THERMAL_PAD [pin 17] - VDD_1 [pin 7] - VDD_2 [pin 8] ### U7 — [CH340C](https://www.flux.ai/vasy_skral/ch340c~xfo.md) - Manufacturer Part Number: CH340C - Datasheet URL: https://datasheet.lcsc.com/szlcsc/Jiangsu-Qin-Heng-CH340C_C84681.pdf - Manufacturer Name: Wah - Role: Interface - Role Details: USB to UART serial converter for ESP-12F serial port - Package: SOIC-16 - Part Type: Integrated Circuit **Pins:** - ~CTS [pin 9] - ~DCD [pin 12] - ~DSR [pin 10] - ~DTR [pin 13] - ~RI [pin 11] - ~RTS [pin 14] - GND [pin 1] - NC [pin 7] - NC [pin 8] - R232 [pin 15] - RXD [pin 3] - TXD [pin 2] - UD- [pin 6] - UD+ [pin 5] - V3 [pin 4] - VCC [pin 16] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/devstat/important-blush-power-laces~jb](https://www.flux.ai/devstat/important-blush-power-laces~jb).* --- *Generated from [https://www.flux.ai/devstat/important-blush-power-laces~jb](https://www.flux.ai/devstat/important-blush-power-laces~jb)*