# 9V LED Blinker ## Description 9V LED blinker with added USB Type-C interface and STM32 microcontroller for future USB communication/programming ## Project Details - **Owner:** devin-flux - **Created:** 3/26/2026 - **Last Updated:** 3/30/2026 - **Visibility:** Public ## Key Components ### D1 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee.md) - Role: Indicator - Package: THT-5MM - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LTL-307EE - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf - Manufacturer Name: Lite-On Inc. - Role Details: Red LED driven from U1 output to blink at approximately 1 Hz **Pins:** - A [pin 2] - K [pin 1] ### J1 — [967](https://www.flux.ai/cherepanyadima/967.md) - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p36.pdf - Package: Through Hole - Manufacturer Part Number: 967 - Role Details: 9V battery snap connector providing raw battery positive and negative terminals - Part Type: Connectors - Manufacturer Name: Keystone Electronics - Role: Power Input **Pins:** - NEG [pin NEG] - POS [pin POS] ### J2 — [UJ20-C-V-G-SMT-P16-TR-65](https://www.flux.ai/adrian95/uj20-c-v-g-smt-p16-tr-65.md) - Part Type: USB C - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: UJ20-C-V-G-SMT-P16-TR-65 - Role: USB Interface - Manufacturer Name: Same Sky - Role Details: USB Type-C receptacle for USB 2.0 device connection; D+ and D- routed to STM32 USB pins - Package: 16-pin SMT - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/uj20-c-v-g-smt-p16-tr-65.pdf - Package or Case Code: UJ20CVGSMTP16TR65 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - DUMMY_1 [pin 1] - DUMMY_2 [pin 2] - DUMMY_3 [pin 3] - DUMMY_4 [pin 4] - GND_1 [pin A1] - GND_2 [pin A12] - GND_3 [pin B1] - GND_4 [pin B12] - SBU1 [pin A8] - SBU2 [pin B8] - VBUS_1 [pin A4] - VBUS_2 [pin A9] - VBUS_3 [pin B4] - VBUS_4 [pin B9] ### S1 — [200USP9T1A1M2RE](https://www.flux.ai/jecstronic/200usp9t1a1m2re.md) - Part Type: Switch - Role: Power Control - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: E-Switch - Datasheet URL: https://eswitch.wpengine.com/wp-content/uploads/2022/06/200U.pdf - Package: THT - Manufacturer Part Number: 200USP9T1A1M2RE - Role Details: Series on off power switch between battery positive and switched 9V rail **Pins:** - COM [pin 6] - NO [pin 4] - SUPPORT_TERMINAL_1 [pin 1] - SUPPORT_TERMINAL_2 [pin 3] ### U1 — [NE555P - 518340](https://www.flux.ai/kicad-part-library/ne555p-518340.md) - Role Details: LM555 astable timer generating approximately 1 Hz blink output - Role: Oscillator - Datasheet URL: http://www.ti.com/lit/ds/symlink/ne555.pdf - Package: PDIP-8 - Manufacturer Part Number: NE555P - Package or Case Code: DIP-8_W7.62mm - Manufacturer Name: Texas Instruments Inc. **Pins:** - CV [pin 5] - DIS [pin 7] - GND [pin 1] - Q [pin 3] - R [pin 4] - THR [pin 6] - TR [pin 2] - VCC [pin 8] ### U2 — [STM32F103C8T6](https://www.flux.ai/vasy_skral/stm32f103c8t6.md) - Role Details: STM32 MCU added for future USB communication/programming; USB data pair connected to native USB pins - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32f103cb.pdf - Role: Microcontroller - Symbol Style: Parametric - Manufacturer Part Number: STM32F103C8T6 - Package: LQFP-48 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Microcontroller - Manufacturer Name: STMicroelectronics **Pins:** - BOOT0 [pin 44] - NRST [pin 7] - PA0 [pin 10] - PA1 [pin 11] - PA10 [pin 31] - PA11 [pin 32] - PA12 [pin 33] - PA13 [pin 34] - PA14 [pin 37] - PA15 [pin 38] - PA2 [pin 12] - PA3 [pin 13] - PA4 [pin 14] - PA5 [pin 15] - PA6 [pin 16] - PA7 [pin 17] - PA8 [pin 29] - PA9 [pin 30] - PB0 [pin 18] - PB1 [pin 19] - PB10 [pin 21] - PB11 [pin 22] - PB12 [pin 25] - PB13 [pin 26] - PB14 [pin 27] - PB15 [pin 28] - PB2 [pin 20] - PB3 [pin 39] - PB4 [pin 40] - PB5 [pin 41] - PB6 [pin 42] - PB7 [pin 43] - PB8 [pin 45] - PB9 [pin 46] - PC13 [pin 2] - PC14 [pin 3] - PC15 [pin 4] - PD0 [pin 5] - PD1 [pin 6] - VBAT [pin 1] - VDD [pin 24] - VDD [pin 36] - VDD [pin 48] - VDDA [pin 9] - VSS [pin 35] - VSS [pin 47] - VSS [pin 23] - VSSA [pin 8] ### U3 — [LY5908](https://www.flux.ai/thea-flux-parts/ly5908.md) - Datasheet URL: https://www.lcsc.com/datasheet/C46613943.pdf - LCSC Part Number: C46613943 - Compliance: RoHS - Manufacturer Part Number: LY5908 - Manufacturer Name: Lingyang Micro - Part Type: Protection - On Resistance: ∼0.12Ω - Mount: Surface Mount - License: https://www.kicad.org/libraries/license/ - JLCPCB Part Class: Extended Part **Pins:** - EN [pin 6] - FAULT [pin 8] - FB [pin 7] - GND [pin 1] - NTC [pin 3] - OUT [pin 5] - RLIMIT [pin 2] - VCC [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/devin-flux/9v-led-blinker](https://www.flux.ai/devin-flux/9v-led-blinker).* --- *Generated from [https://www.flux.ai/devin-flux/9v-led-blinker](https://www.flux.ai/devin-flux/9v-led-blinker)*