# Skin Moisture Optical Sensor 3-Channel f165 ## Description Двухслойная плата 3-канального оптического датчика влажности кожи с ATTINY13, OPA333 и RP2040-LCD-0.96 ## Project Details - **Owner:** vdsgdfghdfdfgh - **Created:** 5/21/2026 - **Last Updated:** 5/21/2026 - **Visibility:** Public - **Forks:** 1 ## Key Components ### J1 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Role Details: 5V input and GND - Part Type: Connector - Role: Power input - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### JISP — [Connector 02x03](https://www.flux.ai/adrian95/connector-02x03~9qh.md) - Role Details: MISO, VCC, SCK, MOSI, RESET, GND for ATTINY13A - Role: ISP header - Manufacturer Part Number: Conn_02x03_Counter_Clockwise **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### JLED — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical~l97.md) - Role Details: Provides common 3V3 plus switched LED cathode/control lines for 660/940/1450 nm LED block - Part Type: Connector - Role: LED block connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### JPD1 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Role Details: Connector for off-board S1337-33BR silicon photodiode, pins PD_SI_IN and AGND; place at optical edge - Role: Sensing (Shunt) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### JPD2 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - Role: InGaAs photodiode connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Pins: PD1450_A, PD1450_K; keep traces to U3 short and guarded from digital lines **Pins:** - P1 [pin 1] - P2 [pin 2] ### JRP1 — [Pin Socket 02x20 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-02x20-254mm-vertical~cqk.md) - Role: RP2040-LCD-0.96 module socket - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role Details: 40-pin Pico-style header: connect ADC0/ADC1/ADC2, AGND, ADC_VREF, 3V3, VSYS/VBUS/GND as needed **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_16 [pin 16] - Pin_17 [pin 17] - Pin_18 [pin 18] - Pin_19 [pin 19] - Pin_2 [pin 2] - Pin_20 [pin 20] - Pin_21 [pin 21] - Pin_22 [pin 22] - Pin_23 [pin 23] - Pin_24 [pin 24] - Pin_25 [pin 25] - Pin_26 [pin 26] - Pin_27 [pin 27] - Pin_28 [pin 28] - Pin_29 [pin 29] - Pin_3 [pin 3] - Pin_30 [pin 30] - Pin_31 [pin 31] - Pin_32 [pin 32] - Pin_33 [pin 33] - Pin_34 [pin 34] - Pin_35 [pin 35] - Pin_36 [pin 36] - Pin_37 [pin 37] - Pin_38 [pin 38] - Pin_39 [pin 39] - Pin_4 [pin 4] - Pin_40 [pin 40] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### LED1 — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Package: LED_0805_2012Metric - Part Type: LED - Forward Voltage: 2.0V - Role Details: LED1 660 nm, placed at skin contact edge with optical barrier to photodiodes - Role: Optical emitter **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Forward Voltage: 1.3V - Part Type: LED - Role: Optical emitter - Package: LED_0805_2012Metric - Role Details: LED2 940 nm, placed at skin contact edge with optical barrier to photodiodes **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Forward Voltage: 1.1V - Role: Optical emitter - Package: LED_0805_2012Metric - Part Type: LED - Role Details: LED3 1450 nm, placed at skin contact edge with optical barrier to photodiodes **Pins:** - A [pin 2] - K [pin 1] ### TP1 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: 5V rail test point - Role: Test Point - Testpoint Size: 0.5 **Pins:** - P1 ### TP2 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Testpoint Size: 0.5 - Role Details: 3.3V rail test point **Pins:** - P1 ### TP3 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Role Details: GND test point - Testpoint Size: 0.5 **Pins:** - P1 ### TP4 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Role: Test Point - Role Details: TIA silicon channel output / ADC0 test point **Pins:** - P1 ### TP5 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Role Details: TIA 1450 nm channel output / ADC1 test point - Testpoint Size: 0.5 **Pins:** - P1 ### TP6 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: ATTINY LED1 660 nm control test point - Role: Test Point - Testpoint Size: 0.5 **Pins:** - P1 ### TP7 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Role: Test Point - Role Details: ATTINY LED2 940 nm control test point **Pins:** - P1 ### TP8 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Role Details: ATTINY LED3 1450 nm control test point - Testpoint Size: 0.5 **Pins:** - P1 ### U1 — [ATTINY13A-SSU](https://www.flux.ai/jecstronic/attiny13a-ssu~t28.md) - Role Details: Controls LED1 660 nm, LED2 940 nm, LED3 1450 nm sequentially; ISP header provided - Manufacturer Name: Microchip Tech - Part Type: Microcontroller - Manufacturer Part Number: ATTINY13A-SSU - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809251730_Microchip-Tech-ATTINY13A-SSU_C14075.pdf - Role: LED channel sequencer **Pins:** - GND - PB0 - PB1 - PB2 - PB3 - PB4 - PB5 - VCC ### U2 — [OPA333AIDBVR](https://www.flux.ai/jecstronic/opa333aidbvr~7a.md) - Manufacturer Name: Texas Instruments - Role Details: TIA for S1337-33BR silicon photodiode 660/940 nm channel; place close to photodiode input - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa333 - Role: Transimpedance amplifier - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA333AIDBVR **Pins:** - - [pin 4] - + [pin 3] - OUTPUT [pin 1] - V- [pin 2] - V+ [pin 5] ### U3 — [OPA333AIDBVR](https://www.flux.ai/jecstronic/opa333aidbvr~7a.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fopa333 - Role: Transimpedance amplifier - Role Details: TIA for 1450 nm InGaAs photodiode channel; place close to photodiode input - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: OPA333AIDBVR **Pins:** - - [pin 4] - + [pin 3] - OUTPUT [pin 1] - V- [pin 2] - V+ [pin 5] ### U4 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Role: 3.3V regulator - Manufacturer Name: Diodes Incorporated - Part Type: Integrated Circuit - Symbol Style: parametric-v1 - Manufacturer Part Number: AP2112K-3.3TRG1 - Role Details: AP2112 3.3V LDO, 1uF input/output capacitors per datasheet - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/vdsgdfghdfdfgh/skin-moisture-optical-sensor-3-channel-f165~wn](https://www.flux.ai/vdsgdfghdfdfgh/skin-moisture-optical-sensor-3-channel-f165~wn).* --- *Generated from [https://www.flux.ai/vdsgdfghdfdfgh/skin-moisture-optical-sensor-3-channel-f165~wn](https://www.flux.ai/vdsgdfghdfdfgh/skin-moisture-optical-sensor-3-channel-f165~wn)*