# 9V 555 LED Blinker ## Description Hand-solderable 9V battery-powered 555 timer circuit that blinks a red LED at about once per second through an on/off switch. ## Project Details - **Owner:** phukovsky - **Created:** 6/8/2026 - **Last Updated:** 6/19/2026 - **Visibility:** Public ## Key Components ### D1 — [TPD4E02B04DQA](https://www.flux.ai/kicad-part-library/tpd4e02b04dqa~id.md) - Datasheet URL: http://www.ti.com/lit/ds/symlink/tpd4e02b04.pdf - Package or Case Code: USON-10_2.5x1.0mm_P0.5mm - Role: ESD Protection - Manufacturer Name: Texas Instruments Inc. - Role Details: Protect USB-C exposed pins from ESD - Manufacturer Part Number: TPD4E02B04DQA **Pins:** - G [pin 3] - G [pin 8] - IO1 [pin 1] - IO2 [pin 2] - IO3 [pin 4] - IO4 [pin 5] - NC [pin 10] - NC [pin 7] - NC [pin 9] - NC [pin 6] ### J1 — [TYPE-C-16M-0243MD](https://www.flux.ai/lcsc/type-c-16m-0243md~qm.md) - Role: USB-C Connector - Part Type: USB Connectors - JLCPCB Part Class: Extended Part - Manufacturer Name: USAKRO(美韩) - Role Details: USB-C sink for 5V charging input; CC pull-downs required - LCSC Part Number: C2798172 - Datasheet URL: https://www.lcsc.com/datasheet/C2798172.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=QlUIU1dSRgJcA1FQQVUMBgdeElQIVldRQ1daVQdeQAcxVlNRTlhWVFFTQ1hXUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Manufacturer Part Number: TYPE-C-16M-0243MD - Package or Case Code: USB-C-SMD_TYPE-611-T3-W **Pins:** - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 20 [pin 20] - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1] - GND [pin A12] - GND [pin B1] - GND [pin B12] - SBU1 [pin A8] - SBU2 [pin B8] - VBUS [pin A9] - VBUS [pin B4] - VBUS [pin B9] - VBUS [pin A4] ### J2 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Role Details: JST-PH 2-pin connector for protected 1S LiPo pouch pack - Role: Battery Connector - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - Manufacturer Name: JST Sales America Inc. **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [ARM JTAG SWD 10Pin 0.1" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-01-connector~wke.md) - Role Details: SWD debug/programming; may be replaced by test pads before layout if thickness requires - Part Type: Connector - Role: Programming Header **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC [pin 7] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### LED1 — [150060RS73220](https://www.flux.ai/vasy_skral/150060rs73220~kj9.md) - Part Type: LED - Role Details: Optional low-current status LED; firmware keeps off during sleep - Manufacturer Part Number: 150060RS73220 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060RS73220.pdf - Manufacturer Name: Würth Elektronik - Role: Status LED **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [B3FS-1002P](https://www.flux.ai/adrian95/b3fs-1002p.md) - Manufacturer Part Number: B3FS-1002P - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf - Part Type: Electromechanical Components - Manufacturer Name: Omron Electronics Inc-EMC Div - Role: User Button - Role Details: Momentary input to wake or trigger user action **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### U1 — [MDBT50Q-P1MV2](https://www.flux.ai/vasyl/mdbt50q-p1mv2~3sa.md) - Datasheet URL: https://www.raytac.com/download/index.php?index_id=43 - Manufacturer Name: Raytac Cororation - Package or Case Code: XCVR_MDBT50Q-1MV2 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: RF module - Role: Signal Generation - Manufacturer Part Number: MDBT50Q-P1MV2 - Role Details: Raytac MDBT50Q-P1MV2 nRF52840 BLE module; replaces bare nRF52840 to avoid custom BLE RF matching and certification risk **Pins:** - P0.20 [pin 44] - D- [pin 34] - D+ [pin 35] - DCCH [pin 31] - GND [pin 15] - GND [pin 2] - GND [pin 33] - GND [pin 55] - GND [pin 1] - P0.00 [pin 17] - P0.01 [pin 18] - P0.02 [pin 11] - P0.03 [pin 9] - P0.04 [pin 20] - P0.05 [pin 21] - P0.06 [pin 22] - P0.07 [pin 23] - P0.08 [pin 24] - P0.09 [pin 52] - P0.10 [pin 54] - P0.11 [pin 27] - P0.12 [pin 29] - P0.13 [pin 37] - P0.14 [pin 36] - P0.15 [pin 39] - P0.16 [pin 38] - P0.17 [pin 41] - P0.18/NRST [pin 40] - P0.19 [pin 42] - P0.21 [pin 43] - P0.22 [pin 46] - P0.23 [pin 45] - P0.24 [pin 48] - P0.25 [pin 49] - P0.26 [pin 19] - P0.27 [pin 16] - P0.28 [pin 13] - P0.29 [pin 10] - P0.30 [pin 14] - P0.31 [pin 12] - P1.00 [pin 47] - P1.01 [pin 61] - P1.02 [pin 50] - P1.03 [pin 60] - P1.04 [pin 56] - P1.05 [pin 59] - P1.06 [pin 57] - P1.07 [pin 58] - P1.08 [pin 25] - P1.09 [pin 26] - P1.10 [pin 3] - P1.11 [pin 4] - P1.12 [pin 5] - P1.13 [pin 6] - P1.14 [pin 7] - P1.15 [pin 8] - SWDCLK [pin 53] - SWDIO [pin 51] - VBUS [pin 32] - VDD [pin 28] - VDDH [pin 30] ### U2 — [LIS2DW12TR](https://www.flux.ai/lcsc/lis2dw12tr~erve.md) - Manufacturer Part Number: LIS2DW12TR - JLCPCB Part Class: Extended Part - Termination: LGA - Role Details: LIS2DW12 always-on accelerometer; INT routed to wake-capable MCU GPIO - Manufacturer Name: ST(意法半导体) - Sensor Type: Accelerometer (3-axis) - Part Type: Motion Sensors - Accelerometers - Product Info Url: https://lcsc.com/product-detail/Motion-Sensors-Accelerometers_STMicroelectronics_LIS2DW12TR_LIS2DW12TR_C189624.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810010032_STMicroelectronics-LIS2DW12TR_C189624.pdf - Package or Case Code: LGA-12_L2.0-W2.0-P0.50-BL - LCSC Part Number: C189624 - Role: Motion Sensor **Pins:** - CS [pin 2] - GND [pin 8] - GND [pin 6] - INT1 [pin 12] - INT2 [pin 11] - NC [pin 5] - RES [pin 7] - SCL/SPC [pin 1] - SDA/SDI/SDO [pin 4] - SDO/SA0 [pin 3] - VDD [pin 9] - VDDIO [pin 10] ### U3 — [MCP73831T-2DCI/OT](https://www.flux.ai/adrian95/mcp73831t-2dciot~0el.md) - Part Type: Power Management - Manufacturer Part Number: MCP73831T-2DCI/OT - Role: Battery Charger - Role Details: LiPo charger; charge current set by PROG resistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology - Datasheet URL: https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP73831-Family-Data-Sheet-DS20001984H.pdf **Pins:** - BAT [pin 3] - CHRG [pin 1] - GND [pin 2] - PROG [pin 5] - VCC [pin 4] ### U4 — [TLV70033QDDCRQ1](https://www.flux.ai/lcsc/tlv70033qddcrq1~om6b.md) - Role Details: 3.3V rail sized for low-power wearable loads and UWB burst current margin - LCSC Part Number: C132090 - Package or Case Code: SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR - Part Type: Linear Voltage Regulators (LDO) - Role: Voltage Regulator - Manufacturer Part Number: TLV70033QDDCRQ1 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010302_Texas-Instruments-TLV70033QDDCRQ1_C132090.pdf - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_TI_TLV70033QDDCRQ1_TLV70033QDDCRQ1_C132090.html - Manufacturer Name: TI(德州仪器) **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC [pin 4] - OUT [pin 5] ### U5 — [TPS22916BYFPT](https://www.flux.ai/lcsc/tps22916byfpt~i3ax.md) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2680360 - Part Type: Power Distribution Switches - Package or Case Code: DSBGA-4_L0.8-W0.8-R2-C2-P0.40-BL - Manufacturer Part Number: TPS22916BYFPT - Role: Switching - Manufacturer Name: TI(德州仪器) - Role Details: Footprinted TPS22916 load switch; switches UWB_3V3 rail off during sleep to minimize standby current **Pins:** - GND [pin B1] - ON [pin B2] - VIN [pin A2] - VOUT [pin A1] ### UWB1 — [DWM3000TR13](https://www.flux.ai/adrian95/dwm3000tr13~9a4.md) - Part Type: Integrated Circuit - Role Details: Qorvo DWM3000 module; place at PCB edge with antenna keepout - Datasheet URL: https://www.qorvo.com/products/d/da008334 - Manufacturer Name: Qorvo - Manufacturer Part Number: DWM3000TR13 - Role: UWB Module - Package or Case Code: DWM3000TR13 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EXTON [pin 1] - GPIO0 [pin 15] - GPIO1 [pin 14] - GPIO2 [pin 13] - GPIO3 [pin 12] - GPIO4 [pin 11] - GPIO5 [pin 10] - GPIO6 [pin 9] - GPIO7 [pin 4] - GPIO8 [pin 22] - RSTN [pin 3] - SPICLK [pin 20] - SPICSN [pin 17] - SPIMISO [pin 19] - SPIMOSI [pin 18] - VDD1 [pin 5] - VDD3V3_1 [pin 6] - VDD3V3_2 [pin 7] - VSS_1 [pin 8] - VSS_2 [pin 16] - VSS_3 [pin 21] - VSS_4 [pin 23] - VSS_5 [pin 24] - WAKEUP [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/phukovsky/9v-555-led-blinker~as](https://www.flux.ai/phukovsky/9v-555-led-blinker~as).* --- *Generated from [https://www.flux.ai/phukovsky/9v-555-led-blinker~as](https://www.flux.ai/phukovsky/9v-555-led-blinker~as)*