ESP32 Build Details

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Project Specification

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Project Specification Project Overview
Compact ESP32-C3 Super Mini carrier for battery-powered audio, sensing, touch, and PWM LED control. Status: Draft implementation.
Intended Use
Prototype controller powered from USB-C or a protected 1S Li-ion cell, with external peripherals attached by soldered wires.
What the Device Should Do
  • Charge a 1S Li-ion battery at up to at least 2 A with power-path/load sharing.
  • Generate a regulated 5 V system rail from the battery.
  • Run an ESP32-C3 Super Mini development board from 5 V.
  • Drive a 4 ohm speaker using a MAX98357A I2S amplifier.
  • Interface to an external INMP441 I2S microphone module.
  • Read a capacitive touch electrode and external LDR.
  • PWM-switch an external 1.5 W LED.
Main Features

Power Budget

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Power Budget Peak Load Estimate
  • ESP32-C3 Super Mini from 5 V: 0.50 A transient allowance.
  • MAX98357A driving 4 ohms: 0.80 A peak allowance.
  • External 1.5 W LED: 0.30 A nominal.
  • 3.3 V peripherals and margin reflected to 5 V: 0.20 A.
  • Total regulated 5 V design target: 1.80 A peak.
Battery-Side Requirement
Using 3.0 V minimum battery voltage and 85% boost efficiency:
Ibat = (5 V x 1.8 A) / (3.0 V x 0.85) = 3.53 A
Size the battery, protection path, boost switch, inductor, and PCB copper for at least 4 A peak. Connectorless battery solder pads and short, wide copper are required.
USB-C Constraint
A USB-C sink with 5.1 kohm CC pull-downs may encounter default-current sources below 2 A. Charger input-current limiting must prevent overdraw; 2 A charging is available on...

flux

Requirements and the 4 A-class battery-side power budget are recorded in the project files. I’m now selecting verified library parts and building the complete schematic; I’ll stop rather than inventing the Super Mini footprint if no dimensionally credible carrier pattern is available.
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ESP32 C3 Carrier Schematic
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flux

The project was renamed ESP32-C3 Audio Touch Controller, and I created the Project Specification and Power Budget files. The budget targets a 1.8 A peak 5 V rail and approximately 3.53 A battery current at 3.0 V and 85% efficiency, requiring a battery/protection/boost path rated for at least 4 A peak.
The schematic build sub-thread completed, but I could not inspect or reconcile its report, verify schematic mutations, run ERC, or continue into PCB placement, routing, DRC, BOM, and Gerber export.
Execution stopped because your ACUs ran out.
Inspect completed schematic
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Power Budget
Peak Load Estimate
  • ESP32-C3 Super Mini from 5 V: 0.50 A transient allowance.
  • MAX98357A driving 4 ohms: 0.80 A peak allowance.
  • External 1.5 W LED: 0.30 A nominal.
  • 3.3 V peripherals and margin reflected to 5 V: 0.20 A.
  • Total regulated 5 V design target: 1.80 A peak.
Battery-Side Requirement
Using 3.0 V minimum battery voltage and 85% boost efficiency:
Ibat = (5 V x 1.8 A) / (3.0 V x 0.85) = 3.53 A
Size the battery, protection path, boost switch, inductor, and PCB copper for at least 4 A peak. Connectorless battery solder pads and short, wide copper are required.
USB-C Constraint
A USB-C sink with 5.1 kohm CC pull-downs may encounter default-current sources below 2 A. Charger input-current limiting must prevent overdraw; 2 A charging is available only from a source advertising adequate current.
Thermal Notes
The 3.3 V rail should power only low-current peripherals. Powering the ESP32 from a 5 V carrier input avoids placing its Wi-Fi transient current through the carrier-board 3.3 V LDO.

  • Peak Load Estimate

  • Battery-Side Requirement

  • USB-C Constraint

  • Thermal Notes