# Cat Deterrent Sprayer 4c02

## Description

Motion\-activated cat deterrent sprayer controller: Ø34 mm round PCB using an ATtiny85, 3\.3 V PIR/logic rail, 5 V USB power\-bank pump rail, MOSFET pump drive, optional keep\-alive load, and compact top\-side SMT layout\.

## Project Details

- **Owner:** chrisbrooks1982
- **Created:** 8/21/2026
- **Last Updated:** 9/1/2026
- **Visibility:** Public

## Key Components

### D1 — [MBR230LSFT1G](https://flux.ai/lcsc/mbr230lsft1g~hg7h.md)

- JLCPCB Part Class: Extended Part
- Product Info Url: https://lcsc\.com/product\-detail/Schottky\-Barrier\-Diodes\-SBD\_ON\_MBR230LSFT1G\_MBR230LSFT1G\_C126673\.html
- Package or Case Code: SOD\-123FL\_L2\.7\-W1\.8\-LS3\.8\-RD
- LCSC Part Number: C126673
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1810241808\_onsemi\-MBR230LSFT1G\_C126673\.pdf
- Manufacturer Name: onsemi\(安森美\)
- Manufacturer Part Number: MBR230LSFT1G
- Role Details: 2 A 30 V Schottky freewheel diode physically close to pump connector to clamp inductive turn\-off\.
- Part Type: Schottky Barrier Diodes \(SBD\)
- Role: Flyback / Freewheeling

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

### F1 — [1812L110/33MR](https://flux.ai/adrian95/1812l11033mr~cmr.md)

- Part Type: Fuse
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1812L110/33MR
- Manufacturer Name: Littelfuse
- Exclude from BOM: false
- Role: Protection
- Role Details: Required populated 1\.1 A hold PPTC in the 5 V input path\.
- Datasheet URL: https://www\.littelfuse\.com/\~/media/electronics/datasheets/resettable\_ptcs/littelfuse\_ptc\_1812l\_datasheet\.pdf\.pdf

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

### J1 — [S2B\-PH\-K\-S\(LF\)\(SN\)](https://flux.ai/adrian95/s2b-ph-k-slfsn~brb.md)

- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf
- Manufacturer Part Number: S2B\-PH\-K\-S\(LF\)\(SN\)
- Manufacturer Name: JST Sales America Inc\.
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### J2 — [S2B\-PH\-K\-S\(LF\)\(SN\)](https://flux.ai/adrian95/s2b-ph-k-slfsn~brb.md)

- Datasheet URL: https://www\.jst\-mfg\.com/product/pdf/eng/ePH\.pdf
- Manufacturer Part Number: S2B\-PH\-K\-S\(LF\)\(SN\)
- Manufacturer Name: JST Sales America Inc\.
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### J3 — [Pin Header 01x03 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md)

- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### LED1 — [0603GBD0790S01](https://flux.ai/adrian95/0603gbd0790s01~iak.md)

- Part Type: LED
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/4336/0603GBD0790S01\.pdf
- Manufacturer Part Number: 0603GBD0790S01
- Manufacturer Name: ORIENTAL TECHNOLOGY
- License: https://creativecommons\.org/licenses/by/4\.0/

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

### Q1 — [AO3400A](https://flux.ai/adrian95/ao3400a~ug9.md)

- Datasheet URL: https://media\.digikey\.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A\_ds\.pdf
- Manufacturer Part Number: AO3400A
- Role Details: 30 V N\-MOSFET low\-side switch for \<=1\.5 A 5 V pump bursts, driven from 3\.3 V MCU through gate resistor\.
- Manufacturer Name: Alpha & Omega Semiconductor Inc\.
- Role: Switching
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Transistor

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### RV1 — [3314G\-1\-103E](https://flux.ai/lcsc/3314g-1-103e~hybx.md)

- JLCPCB Part Class: Extended Part
- LCSC Part Number: C780220
- Manufacturer Name: BOURNS
- Role Details: Optional 10 k trimmer from 3\.3 V to GND with wiper into ATtiny ADC PB1\.
- Role: Voltage Division
- Part Type: Variable Resistors/Potentiometers
- Manufacturer Part Number: 3314G\-1\-103E
- Package or Case Code: RES\-ADJ\-SMD\_3314G\-1\-103E

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

### U1 — [ATTINY85\-20SU](https://flux.ai/adrian95/attiny85-20su~t3s.md)

- Manufacturer Part Number: ATTINY85\-20SU
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Microchip
- Role: Signal Generation
- Part Type: Microcontroller
- Datasheet URL: https://ww1\.microchip\.com/downloads/en/DeviceDoc/Atmel\-2586\-AVR\-8\-bit\-Microcontroller\-ATtiny25\-ATtiny45\-ATtiny85\_Datasheet\-Summary\.pdf
- Role Details: ATtiny85 MCU controlling PIR input, status LED, optional keep\-alive output, and pump gate drive\.

**Pins:**
- \~RESET\~/PB5 [pin 1]
- AREF/PB0 [pin 5]
- GND [pin 4]
- PB1 [pin 6]
- PB2 [pin 7]
- VCC [pin 8]
- XTAL1/PB3 [pin 2]
- XTAL2/PB4 [pin 3]

### U2 — [MCP1700T\-3302E\-TT](https://flux.ai/adrian95/mcp1700t-3302e-tt~h60.md)

- Role Details: 3\.3 V LDO supplying low\-current logic and PIR rail; sized for sensor/MCU load, not pump current\.
- Manufacturer Name: Microchip Technology
- Role: Power Conversion
- Manufacturer Part Number: MCP1700T\-3302E/TT
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Integrated Circuit
- Datasheet URL: https://datasheet\.octopart\.com/MCP1700T\-3302E/TT\-Microchip\-datasheet\-532260\.pdf

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

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/chrisbrooks1982/cat\-deterrent\-sprayer\-4c02\~sv](https://flux.ai/chrisbrooks1982/cat-deterrent-sprayer-4c02~sv).*

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*Generated from [https://flux\.ai/chrisbrooks1982/cat\-deterrent\-sprayer\-4c02\~sv](https://flux.ai/chrisbrooks1982/cat-deterrent-sprayer-4c02~sv)*