# Determined Pink Speeder Bike ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** indocon7ext - **Created:** 2/10/2026 - **Last Updated:** 2/10/2026 - **Visibility:** Public - **System Architecture:** flowchart TD USB_PORT["USB Connector"] -->|VBUS 5V| PWR_SEL["Power Select Jumper"] VIN_HDR["Future VIN Header"] --> PWR_SEL PWR_SEL -->|5V Rail| REG_3V3["3.3V Regulator"] REG_3V3 -->|3V3| ESP["ESP8266-12F Module"] REG_3V3 -->|3V3| LORA_HDR["SX1276 Breakout Header"] USB_PORT -->|D+ D-| USB_UART["USB-UART Bridge"] USB_UART -->|TXD RXD| ESP USB_UART -->|DTR RTS| AUTO_BOOT["Auto Boot Transistor Pair"] AUTO_BOOT -->|EN RST GPIO0| ESP ESP -->|SPI MOSI MISO SCLK CS| LORA_HDR ESP -->|RESET DIO0 DIO1| LORA_HDR LORA_HDR --> RF_NET["RF ANT"] RF_NET --> ANT_SEL["Antenna Select Option"] ANT_SEL --> PCB_ANT["Breakout Antenna"] ANT_SEL --> UFL["U.FL Connector Optional"] REG_3V3 --- DECOUP["10uF Bulk + 100nF Decoupling"] ESP --- DECOUP LORA_HDR --- DECOUP GND["GND"] --- USB_PORT GND --- REG_3V3 GND --- ESP GND --- LORA_HDR GND --- USB_UART GND --- UFL ## Key Components ### J1 — [0473460001](https://www.flux.ai/adrian95/0473460001.md) - Role Details: Provides USB VBUS 5V and D+/D- to USB-UART - Part Type: Connector - Datasheet URL: https://tools.molex.com/pdm_docs/sd/473460001_sd.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: USB Connector - Manufacturer Part Number: 0473460001 - Manufacturer Name: Molex **Pins:** - D- [pin 2] - D+ [pin 3] - GND [pin 5] - ID [pin 4] - SHIELD [pin S5] - SHIELD [pin S1] - SHIELD [pin S2] - SHIELD [pin S6] - SHIELD [pin S4] - SHIELD [pin S3] - VBUS [pin 1] ### J2 — [640452-8](https://www.flux.ai/jecstronic/640452-8.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.te.com/usa-en/product-640452-8.datasheet.pdf - Manufacturer Part Number: 640452-8 - Role Details: Header to SX1276 breakout: 3V3, GND, SCK, MISO, MOSI, NSS, RST, DIO0 - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Role: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] ### J3 — [640452-8](https://www.flux.ai/jecstronic/640452-8.md) - Manufacturer Part Number: 640452-8 - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.te.com/usa-en/product-640452-8.datasheet.pdf - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Role Details: Header to SX1276 breakout extra: DIO1 and optional lines (assumption) **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] ### J4 — [U.FL-R-SMT-1](https://www.flux.ai/vasy_skral/ufl-r-smt-1.md) - Manufacturer Part Number: U.FL-R-SMT-1 - Manufacturer Name: Hirose Electric Co Ltd - Part Type: Connector - Role Details: Optional U.FL external antenna connector for LoRa RF - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/UFL%20Series.pdf - Role: RF Connector **Pins:** - 1 [pin 1] - 2 [pin 2-1] - 3 [pin 2-2] ### Q1 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g.md) - Role: Auto Boot - Role Details: DTR/RTS to EN/GPIO0 auto-program transistor pair - Manufacturer Part Number: MMBT3904LT1G - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Package: SOT-23 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q2 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g.md) - Part Type: Transistor - Package: SOT-23 - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf - Role: Auto Boot - Role Details: DTR/RTS to EN/GPIO0 auto-program transistor pair - Manufacturer Part Number: MMBT3904LT1G - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### S1 — [B3FS-1010](https://www.flux.ai/adrian95/b3fs-1010.md) - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf - Manufacturer Part Number: B3FS-1010 - Manufacturer Name: Omron Electronics Inc-EMC Div - Role: Human Interface - Part Type: Switch - Role Details: Reset pushbutton shorts RST to GND - License: https://creativecommons.org/licenses/by/4.0/ **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.md) - Package or Case Code: smd22 - Role: MCU - Frequency: 80/160MHz - Part Type: Microcontroller - Manufacturer Part Number: ESP-12F - Operating Voltage: 3.3V - Manufacturer Name: Ai-Thinker - Role Details: ESP8266-12F module DevKit-style core - Package: Module - Current: 80mA **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 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33.md) - Manufacturer Part Number: AMS1117-3.3 - Role: Regulator - Symbol Style: Parametric - Part Type: Integrated Circuit - Role Details: 3.3V LDO from USB 5V - Package: SOT-223 - Datasheet URL: http://www.advanced-monolithic.com/pdf/ds1117.pdf - Manufacturer Name: AMS - License: https://creativecommons.org/licenses/by/4.0/ **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/indocon7ext/determined-pink-speeder-bike](https://www.flux.ai/indocon7ext/determined-pink-speeder-bike).* --- *Generated from [https://www.flux.ai/indocon7ext/determined-pink-speeder-bike](https://www.flux.ai/indocon7ext/determined-pink-speeder-bike)*