# Amused Gold Replicator ## Description Wearable closed-loop ultrasonic monitoring and transcutaneous neuromodulation system based on ESP32-C3, powered from a 7.4 V 1000 mAh LiPo battery with TP4056 charging, MT3608 boost conversion, AMS1117-3.3 regulation, JSN-SR04T ultrasonic sensing, LED and buzzer alerts through a BC547 driver, and a reserved neuromodulation interface for future integration. ## Project Details - **Owner:** karlamarge - **Created:** 3/25/2026 - **Last Updated:** 3/27/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD subgraph PWR [Power] BATT[7.4V LiPo Battery] CHG[TP4056 Charger] BOOST[MT3608 Boost] REG[AMS1117 3.3V Regulator] end subgraph SNS [Sensing] US[JSN-SR04T Ultrasonic Sensor] end subgraph CTRL [Control] MCU[ESP32-C3] end subgraph ALT [Alerts] LEDS[Status LEDs] QDRV[BC547 Driver] BZ[Buzzer] end subgraph NMI [Neuromodulation Interface] IFC[Reserved Connector] end BATT --> CHG BATT --> BOOST BOOST --> REG REG --> MCU REG --> US MCU --> US MCU --> LEDS MCU --> QDRV QDRV --> BZ MCU --> IFC ``` ## Key Components ### BZ1 — [Buzzer](https://www.flux.ai/jecstronic/buzzer.md) - Part Type: Buzzer - Package: Through Hole - Role Details: Audible buzzer for alarm indication - Role: Alert **Pins:** - - - + ### ESP1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/vasy_skral/esp32-c3-wroom-02-n4.md) - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: Parametric - Part Type: Module - Manufacturer Name: Espressif Systems - Role: Controller - Package: Module - Role Details: Main ESP32-C3 control and wireless processing module - Implementation Details: IO4=ultrasonic trigger, IO5=ultrasonic echo, IO6=status LED, IO7=alert LED, IO8=buzzer driver, IO10=neuromodulation control, IO18=neuromodulation feedback **Pins:** - 3V3 [pin 1] - EN [pin 2] - GND [pin 38] - GND [pin 32] - GND [pin 37] - GND [pin 22] - GND [pin 19] - GND [pin 34] - GND [pin 31] - GND [pin 21] - GND [pin 39] - GND [pin 36] - GND [pin 9] - GND [pin 25] - GND [pin 33] - GND [pin 29] - GND [pin 30] - GND [pin 28] - GND [pin 20] - GND [pin 35] - GND [pin 26] - GND [pin 24] - GND [pin 23] - GND [pin 27] - IO0 [pin 18] - IO1 [pin 17] - IO10 [pin 10] - IO18 [pin 13] - IO19 [pin 14] - IO2 [pin 16] - IO3 [pin 15] - IO4 [pin 3] - IO5 [pin 4] - IO6 [pin 5] - IO7 [pin 6] - IO8 [pin 7] - IO9 [pin 8] - RXD [pin 11] - TXD [pin 12] ### J1 — [JSN-SR04T-2.0](https://www.flux.ai/vasy_skral/jsn-sr04t-2p0.md) - Manufacturer Part Number: JSN-SR04T-2.0 - Package: Module - Role Details: Ultrasonic ranging sensor for closed-loop monitoring - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Sensor - Role: Sensor - Datasheet URL: https://www.makerguides.com/wp-content/uploads/2019/02/JSN-SR04T-Datasheet.pdf - Implementation Details: TRIG and ECHO used for ultrasonic interface; + tied to battery positive placeholder and unnamed return tied to ground placeholder per available symbol pins - Manufacturer Name: jahankit **Pins:** - - [pin 6] - + [pin 5] - 5V [pin 4] - ECHO [pin 2] - GND [pin 1] - TRIG [pin 3] ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn.md) - Role Details: Single-cell 3.7V LiPo battery connector for charger BAT output - Package: JST-PH 2.0mm RA SMD - Role: Battery Interface - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: JST Sales America Inc. - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Part Type: Connector - Voltage: 3.7V - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [61300411121](https://www.flux.ai/adrian95/61300411121.md) - Implementation Details: Reserved neuromodulation interface: Pin1=3V3, Pin2=CTRL, Pin3=FB, Pin4=GND - Part Type: Connector - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Wurth Elektronik - Datasheet URL: https://www.we-online.com/components/products/datasheet/61300411121.pdf - Connector Type: Header - Role Details: Reserved 4-pin neuromodulation interface connector - Package or Case Code: HDRV4W95P0X254_1X4_1016X254X854P - Connector Positions: 4 - Role: Expansion Interface - Manufacturer Part Number: 61300411121 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### LED1 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric.md) - Role: Indicator - Package: LED_0603 - Role Details: Status LEDs for power and alert indication - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric.md) - Package: LED_0603 - Role: Indicator - Part Type: LED - Role Details: Status LEDs for power and alert indication **Pins:** - A [pin 2] - K [pin 1] ### Q1 — [BC547CTA](https://www.flux.ai/adrian95/bc547cta.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/944/BC546-50.pdf - Role: Driver - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Part Number: BC547CTA - Role Details: NPN low-side driver for buzzer alert output - Package: TO-92-3 - Manufacturer Name: onsemi **Pins:** - B [pin 2] - C [pin 1] - E [pin 3] ### U1 — [BQ24075TRGTR](https://www.flux.ai/adrian95/bq24075trgtr.md) - Package or Case Code: QFN50P300X300X100-17N-D - Manufacturer Name: Texas Instruments - Role: Charger + Power Path - Package: QFN-16 - Part Type: Integrated Circuit - Manufacturer Part Number: BQ24075TRGTR - Role Details: Single-cell LiPo charger with SYS output for seamless system power while charging - Datasheet URL: http://componentsearchengine.com/Datasheets/1/BQ24075TRGTR.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~CE [pin 4] - ~CHG [pin 9] - ~PGOOD [pin 7] - BAT_1 [pin 2] - BAT_2 [pin 3] - EN1 [pin 6] - EN2 [pin 5] - EP [pin 17] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - OUT_1 [pin 10] - OUT_2 [pin 11] - SYSOFF [pin 15] - TMR [pin 14] - TS [pin 1] - VSS [pin 8] ### U2 — [MT3608 - 4414693](https://www.flux.ai/kicad-part-library/mt3608-4414693.md) - Package or Case Code: SOT-23-6 - Role Details: Step-up converter for higher voltage rail generation - Manufacturer Part Number: MT3608 - Role: Boost - 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] ### U3 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33.md) - Role Details: 3.3V linear regulator for control and sensor rail - Manufacturer Name: AMS - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: Parametric - Package: SOT-223 - Datasheet URL: http://www.advanced-monolithic.com/pdf/ds1117.pdf - Part Type: Integrated Circuit - Role: Regulator - Manufacturer Part Number: AMS1117-3.3 **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/karlamarge/amused-gold-replicator](https://www.flux.ai/karlamarge/amused-gold-replicator).* --- *Generated from [https://www.flux.ai/karlamarge/amused-gold-replicator](https://www.flux.ai/karlamarge/amused-gold-replicator)*