# Yearling Apricot Translation Collar ## Description USB-C Powered Arduino Nano ESP32 Soil Monitor with Protected 5 V Rail, Integrated eFuse (OVP/UVLO), 3.3 V Synchronous Buck, SPI Level Shifting, and Optimized 4-Layer Layout ## Project Details - **Owner:** bikram82 - **Created:** 1/8/2026 - **Last Updated:** 1/8/2026 - **Visibility:** Public - **Power Source:** USB C - **Software:** Arduino - **License:** https://creativecommons.org/licenses/by/4.0/ - **Human Interface:** Display - **Connectivity:** WiFi - **Domain:** Agriculture - **Operating Voltage:** 5V - **Manufacturing Quantity Target:** 5 - **Power Requirements:** USB - **System Architecture:** USB_C_VBUS --> EFuse_OVP_UVLO --> V5_Rail --> V3_3_Buck --> V3_3_Rail; V5_Rail --> MAX98357A; ESP32_Nano -->|I2C| OLED, AHT20; ESP32_Nano -->|I2S| MAX98357A; ESP32_Nano -->|SPI| A74AHCT125 --> B74LVC1G125 --> MicroSD; ESP32_Nano -->|ADC| RC_Filter --> Soil_Sensor ## Key Components ### D1 — [USBLC6-2P6](https://www.flux.ai/kicad-part-library/usblc6-2p6.md) - Manufacturer Name: Texas Instruments Inc. - Package: SOT-666 - Role Details: ESD protection for USB D+ and D- data lines on USB-C port - Manufacturer Part Number: USBLC6-2P6 - Role: Protection - Package or Case Code: SOT-666 - Datasheet URL: https://www.st.com/resource/en/datasheet/usblc6-2.pdf **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [SP0505BAHT](https://www.flux.ai/kicad-part-library/sp0505baht.md) - Manufacturer Part Number: SP0505BAHT - Role: Protection - Package or Case Code: SOT-23-6 - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: http://www.littelfuse.com//media/files/littelfuse/technical%20resources/documents/data%20sheets/sp05xxba.pdf - Package: SOT-23-6 - Role Details: Transient voltage suppression for USB-C VBUS 5V rail **Pins:** - A [pin 2] - K [pin 1] - K [pin 6] - K [pin 4] - K [pin 3] - K [pin 5] ### F1 — [0ZCJ0075AF2E](https://www.flux.ai/adrian95/0zcj0075af2e.md) - Manufacturer Part Number: 0ZCJ0075AF2E - Part Type: Fuse - Package: 1206 (3216 Metric) - Role Details: Input polyfuse for USB power - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Datasheet URL: https://www.belfuse.com/resources/datasheets/circuitprotection/ds-cp-0zcj-series.pdf - Manufacturer Name: Bel Fuse Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [MEM2067-02-180-00-A](https://www.flux.ai/adrian95/mem2067-02-180-00-a.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: microSD card socket for SPI interface - Datasheet URL: https://gct.co/files/specs/mem2067-spec.pdf - Part Type: Connector - Manufacturer Part Number: MEM2067-02-180-00-A - Manufacturer Name: GCT - Role: Connector **Pins:** - CD/DAT3 [pin 2] - CLK [pin 5] - CMD [pin 3] - DAT0 [pin 7] - DAT1 [pin 8] - DAT2 [pin 1] - SHIELD [pin 12] - SHIELD [pin 9] - SHIELD [pin 11] - SHIELD [pin 10] - VDD [pin 4] - VSS [pin 6] ### J3 — [0705550036](https://www.flux.ai/adrian95/0705550036.md) - Part Type: Connector - Package or Case Code: 705550036 - Manufacturer Name: Molex - Datasheet URL: https://www.molex.com/pdm_docs/sd/705550036_sd.pdf - Role Details: Header for capacitive soil moisture sensor input - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0705550036 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [2-644861-2](https://www.flux.ai/adrian95/2-644861-2.md) - Manufacturer Part Number: 2-644861-2 - Manufacturer Name: TE Connectivity AMP Connectors - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=644861&DocType=Customer+Drawing&DocLang=English&PartCntxt=2-644861-2&DocFormat=pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Speaker output header - Part Type: Connector - Role: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J5 — [Pin 1.3](https://www.flux.ai/gaby27/pin-1p3.md) - Part Type: Connector - Role Details: Test-point for EN pin - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] ### J6 — [Pin 1.3](https://www.flux.ai/gaby27/pin-1p3.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Connector - Role Details: Test-point for BOOT0 pin **Pins:** - Pin_1 [pin 1] ### J7 — [Pin 1.3](https://www.flux.ai/gaby27/pin-1p3.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Test-point for programming (IO0) - Role: Connector **Pins:** - Pin_1 [pin 1] ### U1 — [ABX00083](https://www.flux.ai/adrian95/abx00083.md) - Part Type: Development Board - Datasheet URL: https://docs.arduino.cc/resources/datasheets/ABX00083-datasheet.pdf - Manufacturer Name: Arduino - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ABX00083 - Role Details: Main MCU - Role: Signal Generation **Pins:** - +3V3_ [pin 2] - A0 [pin 4] - A1 [pin 5] - A2 [pin 6] - A3 [pin 7] - A4 [pin 8] - A5 [pin 9] - A6 [pin 10] - A7 [pin 11] - BOOT0 [pin 3] - BOOT1 [pin 13] - D0/TX [pin 16] - D1/RX [pin 17] - D10_/_CS [pin 28] - D11_/_COPI [pin 29] - D12_/_CIPO [pin 30] - D13_/_SCK_ [pin 1] - D2 [pin 20] - D3 [pin 21] - D4 [pin 22] - D5 [pin 23] - D6 [pin 24] - D7 [pin 25] - D8 [pin 26] - D9 [pin 27] - GND_1 [pin 14] - GND_2 [pin 19] - RST [pin 18] - VBUS [pin 12] - VIN [pin 15] ### U10 — [74AHCT125D,118](https://www.flux.ai/lcsc/74ahct125dc118.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407261709_Nexperia-74AHCT125D-118_C554502.pdf - Part Type: Buffers / Drivers - Manufacturer Name: Nexperia(安世) - LCSC Part Number: C554502 - JLCPCB Part Class: Extended Part - Package or Case Code: SOP-14_L8.6-W3.9-P1.27-LS6.0-BL - Manufacturer Part Number: 74AHCT125D,118 - Product Info Url: https://lcsc.com/product-detail/presales_Nexperia-74AHCT125D-118_C554502.html - Role Details: SPI upshifting from ESP32 to microSD for SCK, MOSI, CS - Role: Logic-level Shifting - Package: SOP-14 **Pins:** - ~{1OE} [pin 1] - ~{2OE} [pin 4] - ~{3OE} [pin 10] - ~{4OE} [pin 13] - 1A [pin 2] - 1Y [pin 3] - 2A [pin 5] - 2Y [pin 6] - 3A [pin 9] - 3Y [pin 8] - 4A [pin 12] - 4Y [pin 11] - GND [pin 7] - VCC [pin 14] ### U11 — [74LVC1G125W5-7](https://www.flux.ai/lcsc/74lvc1g125w5-7.md) - Role: Logic-level Shifting - Manufacturer Name: DIODES(美台) - Manufacturer Part Number: 74LVC1G125W5-7 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-74LVC1G125W5-7_C176930.pdf - Product Info Url: https://lcsc.com/product-detail/presales_Diodes-Incorporated-74LVC1G125W5-7_C176930.html - Role Details: MISO downshifting from microSD to ESP32 - Part Type: 74 Series - LCSC Part Number: C176930 - JLCPCB Part Class: Extended Part - Package or Case Code: SOT-25-5_L2.9-W1.6-P0.95-LS2.8-BL - Package: SOT-25-5 **Pins:** - ~{OE} [pin 1] - A [pin 2] - GND [pin 3] - VCC [pin 5] - Y [pin 4] ### U4 — [AHT20](https://www.flux.ai/lcsc/aht20.md) - Role Details: Temperature and humidity sensor on I2C bus - Package or Case Code: SENSOR-SMD_L3.0-W3.0-P1.00-BR - LCSC Part Number: C2757850 - Manufacturer Part Number: AHT20 - Operating Voltage: 5.5V - JLCPCB Part Class: Extended Part - Part Type: Humidity Sensors/Temperature and Humidity Sensors - Manufacturer Name: 广州奥松 - Power Consumption: 0.8uW **Pins:** - GND [pin 5] - NC [pin 6] - NC [pin 1] - SCL [pin 3] - SDA [pin 4] - VDD [pin 2] ### U6 — [MAX98357AETE+T](https://www.flux.ai/adrian95/max98357aeteplust.md) - Role Details: I2S audio amplifier for speaker output - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MAX98357AETE+T - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Role: Amplification - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/max98357a-max98357b.pdf - Part Type: Integrated Circuit **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] ### U8 — [5V eFuse](https://www.flux.ai/corynrobinson/5v-efuse.md) - Purchase Url: https://octopart.com/tps25200drvt-texas+instruments-38819194?r=sp - Manufacturer Part Number: TPS25200DRVR - Voltage: 5V - Role: Protection - Role Details: eFuse with OVP and UVLO protection on USB-C VBUS line - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps25200.pdf?ts=1643733993618&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-switches%252Fefuse-hotswap-controllers%252Fproducts.html - Package: 6-WSON - Package or Case Code: 6-WSON - Product Info Url: https://www.ti.com/product/TPS25200 - Manufacturer Name: Texas Instruments **Pins:** - *FAULT - EN - EPAD - GND - ILIM - IN - OUT ### U9 — [TPS62130ARGTR](https://www.flux.ai/ryanf/tps62130argtr.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: QFN50P300X300X50-17N - Role Details: 3.3V synchronous buck converter for MCU and sensors - Role: Power Conversion - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps62130a.pdf?ts=1716649051225&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS62130A - Manufacturer Name: Texas Instruments - Part Type: Switching Regulator - Package: QFN (recommended) - Manufacturer Part Number: TPS62130ARGTR **Pins:** - AGND [pin 6] - AGND [pin 17] - AVIN [pin 10] - DEF [pin 8] - EN [pin 13] - FB [pin 5] - FSW [pin 7] - PG [pin 4] - PGND [pin 16] - PGND [pin 15] - PVIN [pin 12] - PVIN [pin 11] - SS/TR [pin 9] - SW [pin 2] - SW [pin 3] - SW [pin 1] - VOS [pin 14] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/bikram82/yearling-apricot-translation-collar](https://www.flux.ai/bikram82/yearling-apricot-translation-collar).* --- *Generated from [https://www.flux.ai/bikram82/yearling-apricot-translation-collar](https://www.flux.ai/bikram82/yearling-apricot-translation-collar)*