# watch ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** kqrthik - **Created:** 3/21/2026 - **Last Updated:** 3/24/2026 - **Visibility:** Public - **System Architecture:** flowchart TD ProbeP["Probe Plus Pad"] --> Protect["Protection And Switching"] ProbeN["Probe Minus Pad"] --> Protect Protect --> Ina["INA226 Sense Block"] Protect --> Ohms["Resistance And Continuity Block"] Protect --> Pwm["PWM Capture Clamp"] Ina --> Mcu["XIAO ESP32 C3"] Ohms --> Mcu Pwm --> Mcu Mcu --> Oled["4 Pin OLED Header"] Mcu --> Motor["Motor Pad And FET"] Bat["2 Pin Battery Header"] --> Mcu ## Key Components ### D1 — [BAT54S-7-F](https://www.flux.ai/adrian95/bat54s-7-f~nki.md) - Role: Clamp - Datasheet URL: https://www.diodes.com/assets/Datasheets/BAT54_A_C_S.pdf - Role Details: Schottky clamp pair for probe and PWM input protection - Manufacturer Name: Diodes Incorporated - Part Type: Diode - Manufacturer Part Number: BAT54S-7-F - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-23-3 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D2 — [BAT54S-7-F](https://www.flux.ai/adrian95/bat54s-7-f~nki.md) - Package: SOT-23-3 - Datasheet URL: https://www.diodes.com/assets/Datasheets/BAT54_A_C_S.pdf - Role Details: Schottky clamp pair for probe and PWM input protection - Role: Clamp - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Manufacturer Part Number: BAT54S-7-F - Manufacturer Name: Diodes Incorporated **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D3 — [1N4148SOD-123](https://www.flux.ai/lcsc/1n4148sod-123~ygrq.md) - JLCPCB Part Class: Extended Part - Role: Flyback - Part Type: Switching Diode - LCSC Part Number: C2972760 - Manufacturer Name: JKSEMI(金开盛) - Package or Case Code: SOD-123_L2.6-W1.6-LS3.5-RD - Package: SOD-123 - Role Details: Flyback clamp across coin vibration motor - Manufacturer Part Number: 1N4148SOD-123 **Pins:** - A [pin 2] - K [pin 1] ### F1 — [MF-MSMF200-2](https://www.flux.ai/lcsc/mf-msmf200-2~hkyo.md) - Role Details: 2A polyfuse in series with external probe input - Package or Case Code: F1812 - Role: Fuse - Manufacturer Name: BOURNS - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010333_BOURNS-MF-MSMF200-2_C210837.pdf - LCSC Part Number: C210837 - Manufacturer Part Number: MF-MSMF200-2 - Package: 1812 - Part Type: Resettable Fuses - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Surface-Mount-Fuses_BOURNS_MF-MSMF200-2_BOURNS-MF-MSMF200-2_C210837.html **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [B2B-PH-K-S(LF)(SN)](https://www.flux.ai/jecstronic/b2b-ph-k-slfsn~nss.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: JST Sales America - Package: JST-PH 2.0 - Manufacturer Part Number: B2B-PH-K-S(LF)(SN) - Part Type: Connector - Role Details: 2-pin battery interface header reserved on PCB for battery connection - Role: Battery Connector - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811151524_JST-Sales-America-B2B-PH-K-S-LF-SN_C131337.pdf **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### J2 — [OLED 128 x 32 0.91inch](https://www.flux.ai/jharwinbarrozo/oled-128-x-32-091inch~11.md) - Role Details: 4-pin external OLED wiring header carrying 3V3, GND, SDA, and SCL - Package: PinHeader_1x04_P2.54mm - Role: OLED Header - Part Type: Display Device **Pins:** - 5V [pin 3] - GND [pin 4] - SCL [pin 2] - SDA [pin 1] ### OLED1 — [OLED 128 x 32 0.91inch](https://www.flux.ai/jharwinbarrozo/oled-128-x-32-091inch~11.md) - Part Type: Display Device - Role Details: I2C OLED display module used as fallback for unavailable 0.49 inch SSD1306 - Package: OLED Module - Role: Display **Pins:** - 5V [pin 3] - GND [pin 4] - SCL [pin 2] - SDA [pin 1] ### Q1 — [2N7002K](https://www.flux.ai/jecstronic/2n7002k~8y.md) - Role: Motor Drive - Package: SOT-23 - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Low-side switch for vibration motor - Datasheet URL: https://www.infineon.com/dgdl/Infineon-2N7002-DS-v02_04-en.pdf - Manufacturer Name: MDD - Manufacturer Part Number: 2N7002K - Part Type: Transistor **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### SW1 — [EVQ-P7A01P](https://www.flux.ai/adrian95/evq-p7a01p~wpc.md) - Role: Button - Datasheet URL: https://www.mouser.com/datasheet/2/315/sw_lt_eng_3529s_side-1289027.pdf - Part Type: Switch - Role Details: Side UI tactile switch for watch interaction - Manufacturer Part Number: EVQ-P7A01P - Manufacturer Name: Panasonic Electronic Components - License: https://creativecommons.org/licenses/by/4.0/ - Package: Side Tact Switch **Pins:** - COM_1 [pin 3] - COM_2 [pin 4] - NO_1 [pin 1] - NO_2 [pin 2] ### SW2 — [EVQ-P7A01P](https://www.flux.ai/adrian95/evq-p7a01p~wpc.md) - Role Details: Side UI tactile switch for watch interaction - License: https://creativecommons.org/licenses/by/4.0/ - Package: Side Tact Switch - Manufacturer Name: Panasonic Electronic Components - Manufacturer Part Number: EVQ-P7A01P - Part Type: Switch - Role: Button - Datasheet URL: https://www.mouser.com/datasheet/2/315/sw_lt_eng_3529s_side-1289027.pdf **Pins:** - COM_1 [pin 3] - COM_2 [pin 4] - NO_1 [pin 1] - NO_2 [pin 2] ### U1 — [INA226AIDGSR](https://www.flux.ai/adrian95/ina226aidgsr~u2n.md) - Part Type: Integrated Circuit - Role Details: INA226 current and bus-voltage monitor for probe input measurement - License: https://creativecommons.org/licenses/by/4.0/ - Role: Current Sense - Datasheet URL: https://www.ti.com/lit/ds/symlink/ina226.pdf - Package: VSSOP-10 - Manufacturer Part Number: INA226AIDGSR - Manufacturer Name: Texas Instruments **Pins:** - A0 [pin 2] - A1 [pin 1] - ALERT [pin 3] - GND [pin 7] - IN- [pin 9] - IN+ [pin 10] - SCL [pin 5] - SDA [pin 4] - VBUS [pin 8] - VS [pin 6] ### U2 — [TS5A23159DGSR](https://www.flux.ai/jecstronic/ts5a23159dgsr~ht3.md) - Role: Analog Switch - Manufacturer Name: Texas Instruments - Role Details: Mode routing and reference selection for multimeter analog front end - Voltage: 3.3V - Manufacturer Part Number: TS5A23159DGSR - Integrated Circuit Type: Analog Switch - Part Type: Analog Switch - License: https://creativecommons.org/licenses/by/4.0/ - Package: VSSOP-10 - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fts5a23159 **Pins:** - COM1 [pin 10] - COM2 [pin 6] - GND [pin 3] - IN1 [pin 1] - IN2 [pin 5] - NC1 [pin 9] - NC2 [pin 7] - NO1 [pin 2] - NO2 [pin 4] - VCC [pin 8] ### U3 — [TS5A23159DGSR](https://www.flux.ai/jecstronic/ts5a23159dgsr~ht3.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fts5a23159 - Role: Analog Switch - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Analog Switch - Voltage: 3.3V - Role Details: Mode routing and reference selection for multimeter analog front end - Manufacturer Part Number: TS5A23159DGSR - Package: VSSOP-10 - Integrated Circuit Type: Analog Switch - Manufacturer Name: Texas Instruments **Pins:** - COM1 [pin 10] - COM2 [pin 6] - GND [pin 3] - IN1 [pin 1] - IN2 [pin 5] - NC1 [pin 9] - NC2 [pin 7] - NO1 [pin 2] - NO2 [pin 4] - VCC [pin 8] ### U4 — [TS5A23159DGSR](https://www.flux.ai/jecstronic/ts5a23159dgsr~ht3.md) - Voltage: 3.3V - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fts5a23159 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Analog Switch - Part Type: Analog Switch - Integrated Circuit Type: Analog Switch - Role Details: Mode routing and reference selection for multimeter analog front end - Manufacturer Part Number: TS5A23159DGSR - Package: VSSOP-10 - Manufacturer Name: Texas Instruments **Pins:** - COM1 [pin 10] - COM2 [pin 6] - GND [pin 3] - IN1 [pin 1] - IN2 [pin 5] - NC1 [pin 9] - NC2 [pin 7] - NO1 [pin 2] - NO2 [pin 4] - VCC [pin 8] ### U5 — [P6KE62A-B](https://www.flux.ai/lcsc/p6ke62a-b~da3g.md) - JLCPCB Part Class: Extended Part - Package: DO-15 - LCSC Part Number: C1666977 - Manufacturer Part Number: P6KE62A-B - Part Type: TVS - Package or Case Code: DO-15_BD3.1-L6.7-P10.70-D0.9-RD - Role Details: Primary transient clamp on probe input after fuse - Role: TVS Protection - Manufacturer Name: DIODES(美台) **Pins:** - 1 [pin 1] - 2 [pin 2] ### U6 — [MCP6561RT-E-OT](https://www.flux.ai/adrian95/mcp6561rt-e-ot~54u.md) - Manufacturer Part Number: MCP6561RT-E/OT - Voltage: 3.3V - Role: Comparator - Part Type: Integrated Circuit - Package: SOT-23-5 - Integrated Circuit Type: Comparator - Datasheet URL: https://www.snapeda.com/parts/MCP6561RT-E/OT/Microchip/datasheet/ - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology Inc. - Role Details: Continuity comparator with push-pull output used in place of missing TLV3201 **Pins:** - IN- [pin 4] - IN+ [pin 3] - OUT [pin 1] - VDD [pin 5] - VSS [pin 2] ### U7 — [Seeed Studio XIAO ESP32C3 SMD](https://www.flux.ai/markparts/seeed-studio-xiao-esp32c3-smd~ri.md) - Manufacturer Name: Seeed Studio - Purchase Url: https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html - Part Type: Microcontroller - Manufacturer Part Number: 113991054 - Role: MCU - Role Details: Main controller, UI processor, and power management interface - Package: XIAO ESP32-C3 SMD - Datasheet URL: https://files.seeedstudio.com/wiki/XIAO_WiFi/Resources/esp32-c3_datasheet.pdf **Pins:** - 3V3 [pin 12] - 5V [pin 14] - D10_MOSI_D10 [pin 11] - D7_RX_GPIO20 [pin 8] - D8_SCK_GPIO8 [pin 9] - D9_MISO_GPIO9 [pin 10] - GND [pin 13] - GPIO2_A0_D0 [pin 1] - GPIO21_TX_D6 [pin 7] - GPIO3_A1_D1 [pin 2] - GPIO4_A2_D2 [pin 3] - GPIO5_A3_D3 [pin 4] - GPIO6_SDA_D4 [pin 5] - GPIO7_SCL_D5 [pin 6] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/kqrthik/watch~ya](https://www.flux.ai/kqrthik/watch~ya).* --- *Generated from [https://www.flux.ai/kqrthik/watch~ya](https://www.flux.ai/kqrthik/watch~ya)*