ESP32 LED Board Design
Worked for 6 mins 5 sec
Created 4 project docs
Block Diagram
Block Diagram
System Architecture
Assemblies
- Main controller/power PCB — USB-C PD input, 2S charger/protection/balancing, 5 V LED buck, 3.3 V MCU buck, ESP32-C3, level shifting, LED output, pack connector, debug/programming, and button-cable connector.
- Separate six-button PCB — six momentary switches and matching polarized locking ribbon connector. Allocation: six signals, two grounds, and two reserved/ground positions for return-path robustness.
- USB-C PD sink: reference search required; import exact/close standalone reference if available.
- Balanced 2S charger: reference search required; import exact/close standalone reference if available.
- 2S protection/balancing: reference search required; import exact/close standalone...
Project Specification
Project Specification
Project Overview
Status: Draft — schematic phase. A two-PCB BLE LED controller for installation in a non-conductive tube.
Intended Use
Portable battery-powered controller for 100 Adafruit ADA2328 5 V addressable LEDs, operated by six wired buttons and BLE.
What the Device Should Do
- Drive 100 addressable LEDs while enforcing a 20 W electrical LED-output cap.
- Provide BLE control with Wi-Fi disabled in firmware.
- Charge a protected/balanced 2S 18650 pack from a USB-C PD supply.
- Positively disable LED power and normal operation whenever USB-C is inserted/charging.
- Read six independent momentary buttons on a separate PCB.
ESP32-C3 module; 2S pack protection/balancing; 9 V PD sink; balanced 2S charger; 5 V/4 A LED rail; efficient ...
Firmware Getting Started
Firmware Getting Started
Toolchain
PlatformIO + Arduino-ESP32.
Final MCU Pin Mapping
Compilable Starter (platformio.ini:src/main.cpp)
Startup SequenceDepending on Arduino-ESP32 release, include `` and omitbtStop()if it conflicts with NimBLE startup. The hardware shutdown/charge inhibit must not depend on this firmware.
- Confirm hardware charge inhibit is inactive.
- Initialize serial diagnostics.
- Keep Wi-Fi disabled.
- Configure buttons and ADC.
- Initialize FastLED power limiter before enabling patterns.
- Start BLE GATT service and advertising.
Board Bring-Up Plan
Board Bring-Up Plan
Preconditions
Do not install cells until charger, protection, and regulator support circuits have been checked against final datasheets and ERC is clean. Use a current-limited bench supply and thermal camera.
Main Board
- Visual inspection: polarity, exposed pads, solder bridges, antenna keepout, connector pin-1 orientation.
- Resistance checks: GND-to-pack, GND-to-5 V, and GND-to-3.3 V must not be shorted.
- Power protected pack input from 6.0 V at 100 mA limit with LED load disconnected. Pass: no unexpected heating/current-limit entry.
- Verify 3.3 V rail within ±3%; verify EN reset behavior and programming access.
- Verify ESP32 boot log; flash starter firmware; confirm BLE advertising with Wi-Fi disabled.
The specification and six-button subsystem are complete. I found the first pass left the high-power charging and protection circuitry unfinished, so I’m completing that block now rather than treating an unsafe partial schematic as done.
Worked for 12 mins 19 sec
The requirements, power budget, firmware starter, bring-up plan, six-button board, and most main-controller circuitry are complete. The design now includes full 2S protection, USB-C PD charging, charge-time shutdown, 5 V/4 A LED power, and ESP32-C3 BLE control.
Blocked: a manufacturable 3-wire battery connector must be selected for PACK− / cell midpoint / PACK+, followed by a final capacitor/package audit and ERC cleanup. Please specify a preferred connector family—JST-XH, JST-PH, or direct solder pads—before I finalize the schematic.
Use JST-XH connector
Use JST-PH connector
Use solder pads
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Block Diagram
System Architecture
Diagram
Assemblies
- Main controller/power PCB — USB-C PD input, 2S charger/protection/balancing, 5 V LED buck, 3.3 V MCU buck, ESP32-C3, level shifting, LED output, pack connector, debug/programming, and button-cable connector.
- Separate six-button PCB — six momentary switches and matching polarized locking ribbon connector. Allocation: six signals, two grounds, and two reserved/ground positions for return-path robustness.
Functional-Block Sourcing Plan
- USB-C PD sink: reference search required; import exact/close standalone reference if available.
- Balanced 2S charger: reference search required; import exact/close standalone reference if available.
- 2S protection/balancing: reference search required; import exact/close standalone reference if available.
- 5 V / 4 A synchronous buck: reference search required; import exact/close standalone reference if available.
- 3.3 V efficient buck: reference search required; import exact/close standalone reference if available.
- ESP32-C3 core: reference search required; import exact/close standalone reference if available.
- LED data buffer, external interfaces, cable protection, and buttons: source from real library parts where no focused reusable reference exists.
System Architecture
Assemblies
Functional-Block Sourcing Plan
