# Wearable Helmet LED Controller

## Description

Compact 1S LiPo\-powered controller for dual\-eye addressable RGB helmet lighting with capacitive touch gestures, USB\-C charging, persistent color selection, and expandable firmware\.

## Project Details

- **Owner:** emoo63777
- **Created:** 9/12/2026
- **Last Updated:** 9/12/2026
- **Visibility:** Public

## Key Components

### D1 — [ESD5341N](https://flux.ai/lcsc/esd5341n~k8iz.md)

- Forward Voltage: 0\.7V at 1AV
- Functional Group: USB\-C and Charging
- Datasheet URL: https://www\.lcsc\.com/datasheet/C3021106\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVVxRR1JXUTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- LCSC Part Number: C3021106
- Manufacturer Part Number: ESD5341N
- Role: ESD Protection
- Package or Case Code: DFN1006\-2L\-RD
- Part Type: TVS
- Role Details: USB VBUS 5V ESD clamp
- License: https://creativecommons\.org/licenses/by/4\.0/
- Max Reverse Voltage: 5V

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J1 — [USB4215\-03\-A](https://flux.ai/adrian95/usb4215-03-a~kg3.md)

- Role Details: 5V sink\-only charging input; USB data unused
- Datasheet URL: https://gct\.co/files/specs/usb4215\-spec\.pdf
- Functional Group: USB\-C and Charging
- Part Type: USB C
- Symbol Style: parametric\-v1
- Package or Case Code: GCT\_USB4215\-03\-A\_REVA
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: GCT
- Manufacturer Part Number: USB4215\-03\-A
- Role: USB\-C Receptacle

**Pins:**
- CC1 [pin A5]
- CC2 [pin B5]
- DN1 [pin A7]
- DN2 [pin B7]
- DP1 [pin A6]
- DP2 [pin B6]
- GND\_A [pin A1\_B12]
- GND\_B [pin B1\_A12]
- SBU1 [pin A8]
- SBU2 [pin B8]
- SHIELD [pin SH1]
- SHIELD [pin SH4]
- SHIELD [pin SH2]
- SHIELD [pin SH3]
- VBUS\_A [pin A4\_B9]
- VBUS\_B [pin B4\_A9]

### J2 — [S2B\-PH\-SM4\-TB\(LF\)\(SN\)](https://flux.ai/adrian95/s2b-ph-sm4-tblfsn~b96.md)

- Manufacturer Name: JST Sales America Inc\.
- Functional Group: Battery and Main Switch
- Symbol Style: parametric\-v1
- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf
- Manufacturer Part Number: S2B\-PH\-SM4\-TB\(LF\)\(SN\)
- Role: Battery Connector
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: Protected 1S LiPo connector: P1=BAT\_RAW positive, P2=GND; protection is assumed in pack and not duplicated
- Part Type: Connector

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J3 — [533750410](https://flux.ai/lcsc/533750410~gbd3.md)

- Manufacturer Name: MOLEX
- Functional Group: LED Outputs
- Manufacturer Part Number: 533750410
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2406281012\_MOLEX\-533750410\_C327537\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/Wire\-To\-Board\-Wire\-To\-Wire\-Connector\_MOLEX\-533750410\_C327537\.html
- Role: LED Connector
- Role Details: Left eye: pin1 LED\_5V, pin2 data in, pin3 data return from left strip, pin4 GND
- Package or Case Code: CONN\-TH\_4P\-P2\.50\_533750410
- LCSC Part Number: C327537
- Part Type: Wire To Board / Wire To Wire Connector
- JLCPCB Part Class: Extended Part

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J4 — [533750410](https://flux.ai/lcsc/533750410~gbd3.md)

- Manufacturer Name: MOLEX
- Role Details: Right eye: pin1 LED\_5V, pin2 data in from J3 return, pin3 NC/end\-of\-chain, pin4 GND
- Manufacturer Part Number: 533750410
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2406281012\_MOLEX\-533750410\_C327537\.pdf
- Product Info Url: https://lcsc\.com/product\-detail/Wire\-To\-Board\-Wire\-To\-Wire\-Connector\_MOLEX\-533750410\_C327537\.html
- Package or Case Code: CONN\-TH\_4P\-P2\.50\_533750410
- LCSC Part Number: C327537
- Part Type: Wire To Board / Wire To Wire Connector
- JLCPCB Part Class: Extended Part
- Role: LED Connector
- Functional Group: LED Outputs

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J5 — [5600200220](https://flux.ai/lcsc/5600200220~mj87.md)

- Functional Group: Capacitive Touch
- Manufacturer Part Number: 5600200220
- LCSC Part Number: C114092
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2406280946\_MOLEX\-5600200220\_C114092\.pdf
- Role: Touch Connector
- JLCPCB Part Class: Extended Part
- Role Details: Left remote electrode and ground/shield reference
- Product Info Url: https://lcsc\.com/product\-detail/Connectors\_MOLEX\_5600200220\_Connectors\-2Contacts\-2mm\-1\_C114092\.html
- Part Type: Wire To Board / Wire To Wire Connector
- Manufacturer Name: MOLEX
- Package or Case Code: CONN\-SMD\_SMD\-1X2P\-2\.0MM\-10\.9X7\.8

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J6 — [5600200220](https://flux.ai/lcsc/5600200220~mj87.md)

- Manufacturer Part Number: 5600200220
- LCSC Part Number: C114092
- Functional Group: Capacitive Touch
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2406280946\_MOLEX\-5600200220\_C114092\.pdf
- JLCPCB Part Class: Extended Part
- Role Details: Right remote electrode and ground/shield reference
- Product Info Url: https://lcsc\.com/product\-detail/Connectors\_MOLEX\_5600200220\_Connectors\-2Contacts\-2mm\-1\_C114092\.html
- Role: Touch Connector
- Part Type: Wire To Board / Wire To Wire Connector
- Manufacturer Name: MOLEX
- Package or Case Code: CONN\-SMD\_SMD\-1X2P\-2\.0MM\-10\.9X7\.8

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]

### J7 — [Pin Header 01x03 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md)

- Functional Group: MCU and Programming
- Role: Programming Header
- Part Type: Connector
- Role Details: UPDI, 3\.3V reference, GND
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]

### SW1 — [SPDT Toggle Switch on\-none\-on](https://flux.ai/jwwitherspoon/spdt-toggle-switch-on-none-on~rz.md)

- Manufacturer Name: E\-Switch
- Role Details: 3A SPDT used as SPST hard battery disconnect; unused throw NC
- Purchase Url: https://www\.digikey\.com/en/products/detail/e\-switch/200MSP1T1B1M2QEH/378916
- Part Type: Switch
- Manufacturer Part Number: 200MSP1T1B1M2QEH
- Role: Main Power Switch
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/6463/Series%20200%20Switches\.pdf
- Current: 3A
- Functional Group: Battery and Main Switch

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]

### U1 — [ATTINY1616\-MFR](https://flux.ai/lcsc/attiny1616-mfr~qmmc.md)

- Role: Microcontroller
- Datasheet URL: https://ww1\.microchip\.com/downloads/en/DeviceDoc/ATtiny1614\-16\-17\-DataSheet\-DS40002204A\.pdf
- Symbol Style: parametric\-v1
- Role Details: Main controller: PA0=UPDI, PA2=TOUCH\_OUT interrupt, PA4=LED\_PWR\_EN, PA5=LED\_DATA\_3V3, PA6=LED\_OE\_CTRL; remaining GPIO NC
- LCSC Part Number: C1338523
- Package or Case Code: QFN\-20\_L3\.0\-W3\.0\-P0\.40\-TL\-EP1\.7
- Manufacturer Part Number: ATTINY1616\-MFR
- Manufacturer Name: MICROCHIP\(美国微芯\)
- Part Type: Integrated Circuit
- JLCPCB Part Class: Extended Part
- Functional Group: MCU and Programming

**Pins:**
- EP [pin 21]
- EXTCLK/PA3 [pin 2]
- GND [pin 3]
- PA0/\~\{RESET\}/UPDI [pin 19]
- PA1 [pin 20]
- PA2 [pin 1]
- PA4 [pin 5]
- PA5 [pin 6]
- PA6 [pin 7]
- PA7 [pin 8]
- PB0 [pin 14]
- PB1 [pin 13]
- PB2/TOSC2 [pin 12]
- PB3/TOSC1 [pin 11]
- PB4 [pin 10]
- PB5 [pin 9]
- PC0 [pin 15]
- PC1 [pin 16]
- PC2 [pin 17]
- PC3 [pin 18]
- VDD [pin 4]

### U2 — [AT42QT1010\-TSHR](https://flux.ai/vasy_skral/at42qt1010-tshr~f90.md)

- Role: Touch Controller
- Functional Group: Capacitive Touch
- Role Details: Single\-channel capacitive touch sensing
- Part Type: Integrated Circuit
- Manufacturer Part Number: AT42QT1010\-TSHR
- Datasheet URL: http://ww1\.microchip\.com/downloads/en/DeviceDoc/40001946A\.pdf
- Manufacturer Name: Microchip Technology

**Pins:**
- OUT [pin 1]
- SNS [pin 4]
- SNSK [pin 3]
- SYNC [pin 6]
- VDD [pin 5]
- VSS [pin 2]

### U3 — [BQ24075RGTR](https://flux.ai/adrian95/bq24075rgtr.md)

- Datasheet URL: http://www\.ti\.com/lit/ds/symlink/bq24075\.pdf
- Manufacturer Name: Texas Instruments
- Functional Group: USB\-C and Charging
- Manufacturer Part Number: BQ24075RGTR
- Role Details: BQ24075 1S charger/power path; provisional 500mA charge, ILIM\-mode input limit, supports \>=0\.8A peak system budget
- Role: Battery Charger
- Symbol Style: parametric\-v1
- Part Type: Integrated Circuits

**Pins:**
- \~CE [pin 4]
- \~CHG [pin 9]
- \~PGOOD [pin 7]
- BAT\_1 [pin 2]
- BAT\_2 [pin 3]
- EN1 [pin 6]
- EN2 [pin 5]
- GND [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]

### U4 — [TPS61023DRLT](https://flux.ai/lcsc/tps61023drlt~2o8h.md)

- Manufacturer Part Number: TPS61023DRLT
- Symbol Style: parametric\-v1
- Role Details: 5V LED rail from switched protected 1S LiPo; 515mA battery peak budget
- Package or Case Code: SOT\-563\-6\_L1\.6\-W1\.2\-P0\.5\-LS1\.6\-BR
- Manufacturer Name: TI\(德州仪器\)
- Role: Boost Converter
- LCSC Part Number: C1852149
- Part Type: DC\-DC Converters
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps61023\.pdf?HQS=dis\-dk\-null\-digikeymode\-dsf\-pf\-null\-wwe&ts=1780565213480&ref\_url=https%253A%252F%252Fwww\.ti\.com%252Fgeneral%252Fdocs%252Fsuppproductinfo\.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww\.ti\.com%252Flit%252Fgpn%252Ftps61023
- Functional Group: 5V LED Power

**Pins:**
- EN [pin 2]
- FB [pin 1]
- GND [pin 4]
- SW [pin 5]
- VIN [pin 3]
- VOUT [pin 6]

### U5 — [MCP1703Ax\-330xxTT](https://flux.ai/kicad-part-library/mcp1703ax-330xxtt~9wn.md)

- Datasheet URL: http://ww1\.microchip\.com/downloads/en/DeviceDoc/20005122B\.pdf
- Package or Case Code: SOT\-23
- Manufacturer Name: Microchip Technology Inc\.
- Role Details: Low\-Iq 3\.3V logic rail; logic peak about 14\.5mA
- Role: Linear Regulator
- Functional Group: 3\.3V Logic Power
- Manufacturer Part Number: MCP1703Ax\-330xxTT

**Pins:**
- GND [pin 1]
- VI [pin 3]
- VO [pin 2]

### U6 — [74AHCT1G125W5\-7](https://flux.ai/lcsc/74ahct1g125w5-7~t6h6.md)

- LCSC Part Number: C842287
- Package or Case Code: SOT\-25\-5\_L3\.0\-W1\.6\-P0\.95\-LS2\.8\-BL
- Role: Level Shifter
- Part Type: Buffers / Drivers
- Manufacturer Name: DIODES\(美台\)
- Role Details: AHCT 3\.3V\-to\-5V LED data buffer with controlled OE
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: 74AHCT1G125W5\-7
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: LED Data Interface
- Datasheet URL: https://www\.lcsc\.com/datasheet/C842287\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VbVlZfRVhaVzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D

**Pins:**
- \~\{OE\} [pin 1]
- A [pin 2]
- GND [pin 3]
- Vcc [pin 5]
- Y [pin 4]

### U7 — [MP5075L](https://flux.ai/monolithicpower/mp5075l~lc.md)

- Product Image Url: https://www\.monolithicpower\.com/pub/media/catalog/product/M/P/MP5075L\_483\_1\.jpg
- Product Info Url: https://www\.monolithicpower\.com/en/catalog/product/view/id/483?utm\_source=ultralibrarian&utm\_medium=component\_search&utm\_campaign=listing
- Manufacturer Part Number: MP5075L
- Package or Case Code: SOT563\_MP5075L\_MNP
- Manufacturer Name: Monolithic Power Systems
- Functional Group: 5V LED Power
- Role Details: MCU\-controlled default\-off LED 5V output rail
- Datasheet URL: https://www\.monolithicpower\.com/en/documentview/productdocument/index/version/2/document\_type/Datasheet/lang/en/sku/MP5075L
- Role: Load Switch

**Pins:**
- EN [pin 5]
- GND [pin 4]
- NC [pin 6]
- NC [pin 1]
- VIN [pin 2]
- VOUT [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/emoo63777/wearable\-helmet\-led\-controller\~ek](https://flux.ai/emoo63777/wearable-helmet-led-controller~ek).*

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*Generated from [https://flux\.ai/emoo63777/wearable\-helmet\-led\-controller\~ek](https://flux.ai/emoo63777/wearable-helmet-led-controller~ek)*