# ESPRSSO32 Smart Scale AI Auto Layout [Example] ## Description ESPRSSO32 Smart Scale with 555 LED Blinker ## Project Details - **Owner:** muthu7417 - **Created:** 3/16/2026 - **Last Updated:** 3/16/2026 - **Visibility:** Public - **555 LED Target Blink Frequency:** 0.686Hz - **555 LED Design Notes:** TLC555 astable on PP5V0 with R9=10k, R10=100k, C14=10uF, nominal blink frequency 0.686 Hz. LED1 uses R11=330 for current limiting on a red 0603 LED. Added 100nF supply decoupling and 10nF control-pin bypass for timer stability. - **555 LED Supply:** PP5V0 - **System Architecture:** ```mermaid flowchart TD P[PP5V0 5V Rail] --> U[TLC555 Astable Oscillator] U --> R[Base Resistor] R --> Q[NPN Low Side Driver] P --> B[Passive Buzzer] B --> Q U --> T[Timing RC Network] U --> D[Local Decoupling] Q --> G[GND] U --> G D --> G ``` - **LED Behavior Definition:** Implemented as a stand-alone 555 astable LED blinker: single LED with a series current-limiting resistor. 'Serial LED' interpreted as LED in series with resistor, not LED chaser or digital serial LED. Supply selected from existing PP5V0 rail for easy integration with the ESPRSSO32 Smart Scale project. - **Stars:** 1 ## Key Components ### BZ1 — [GT-0905A](https://www.flux.ai/vasy_skral/gt-0905a.md) - Role Details: Externally driven passive buzzer connected to 5 V and transistor switch - Frequency: 3kHz - Manufacturer Name: Soberton Inc. - Role: Actuator - Part Type: Buzzers - Manufacturer Part Number: GT-0905A - Datasheet URL: https://www.soberton.com/wp-content/uploads/2019/02/GT-0905A-19-Feb-2019.pdf - Operating Voltage: 5V - Package: Through Hole **Pins:** - - [pin 2] - + [pin 1] ### IC1 — [TLC555CDR](https://www.flux.ai/jecstronic/tlc555cdr.md) - Role Details: 5 V astable timer generating about 3 kHz for passive buzzer drive - Package: SOIC-8 - Datasheet URL: https://www.ti.com/lit/ds/symlink/tlc555.pdf - Frequency: 3kHz - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Role: Oscillator - Manufacturer Part Number: TLC555CDR **Pins:** - CONT [pin 5] - DISCH [pin 7] - GND [pin 1] - OUT [pin 3] - RESET [pin 4] - THRES [pin 6] - TRIG [pin 2] - VDD [pin 8] ### Q1 — [MMBT2222A,215](https://www.flux.ai/adrian95/mmbt2222ac215.md) - Part Type: Transistor - Manufacturer Part Number: MMBT2222A,215 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Nexperia USA Inc. - Role: Driver - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/MMBT2222A.pdf - Package: TO-236AB - Role Details: NPN low-side switch for passive buzzer current from 5 V rail **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/muthu7417/esprsso32-smart-scale-ai-auto-layout-example](https://www.flux.ai/muthu7417/esprsso32-smart-scale-ai-auto-layout-example).* --- *Generated from [https://www.flux.ai/muthu7417/esprsso32-smart-scale-ai-auto-layout-example](https://www.flux.ai/muthu7417/esprsso32-smart-scale-ai-auto-layout-example)*