ESP32-S3 Project Design
Thought for 11 sec
I started the upgrade plan for the full professional ESP32-S3 handheld design, but execution is currently blocked because the account has no available ACUs, so I can’t run the schematic/layout tools.
Current project state from the previous completed work:
- Existing schematic has ESP32-S3-WROOM-1-N8R8, USB-C, 3.3 V regulator, BOOT/RESET, and 8 buttons.
- Existing ERC/passive checks were clean at that stage.
- Existing files include power budget, firmware starter, bring-up plan, and regulatory notes for the simpler 8-key controller.
Remaining work once ACUs are available:
- Replace/expand the power system for 3× parallel Li-Ion cells with USB-C charging, power-path management, protection, fuel gauge/current monitoring, and test points.
- Add audio playback path, amplifier, speaker connector, headphone jack with switching.
- Add haptic motor driver.
- Add protected laser output with current limiting and ESP32/button control.
- Add debug/programming headers, USB ESD/surge/reverse protection, and updated BOM/design notes.
- Validate the complete schematic, then proceed to PCB layout only after your confirmation.
Add NTC to measure the battery heat
Thought for 3 sec
I can add an NTC battery temperature sensor to the design, but I’m currently blocked because the account has no available ACUs, so I can’t modify the schematic right now.
Recommended implementation when ACUs are available:
- Add a 10 kΩ NTC thermistor mounted near or against the Li-Ion cell pack.
- Wire it as a voltage divider to an ESP32-S3 ADC pin.
- Use a precision pull-up or pull-down resistor, typically 10 kΩ, to 3.3 V or GND.
- Add a small filter capacitor, e.g. 100 nF, on the ADC sense node.
- Optionally connect the NTC to the charger IC’s TS/TEMP pin as well, if the selected charger supports battery temperature qualification.
- Add firmware limits to stop charging/discharging or warn the user if the pack is too hot or too cold.
Once ACUs are available, the next schematic update should add the NTC circuit, assign an ADC GPIO, and update the battery monitoring/design notes.
Choose ADC pin
Set NTC values
Check charger TEMP
Save NTC note
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Firmware Starter — ESP32-S3 8-Key Controller
Platform & Toolchain
- MCU: ESP32-S3-WROOM-1-N8R8
- Framework: Arduino via PlatformIO
- USB: Native ESP32-S3 USB Serial/JTAG via GPIO19 D- and GPIO20 D+
Pin Mapping
Table
| Function | GPIO | Net | Direction | Notes |
|---|---|---|---|---|
| Key 1 | 4 | KEY1 | Input pull-up | SW1 to GND, active-low |
| Key 2 | 5 | KEY2 | Input pull-up | SW2 to GND, active-low |
| Key 3 | 6 | KEY3 | Input pull-up | SW3 to GND, active-low |
| Key 4 | 7 | KEY4 | Input pull-up | SW4 to GND, active-low |
| Key 5 | 8 | KEY5 | Input pull-up | SW5 to GND, active-low |
| Key 6 | 9 | KEY6 | Input pull-up | SW6 to GND, active-low |
| Key 7 | 10 | KEY7 | Input pull-up | SW7 to GND, active-low |
| Key 8 | 11 | KEY8 | Input pull-up | SW8 to GND, active-low |
| BOOT | 0 | BOOT | Input strap | SW9 to GND for download mode |
| Reset/Enable | EN | ESP_EN | Hardware | R1 10 kΩ to 3V3, C4 1 uF to GND, SW10 to GND |
| USB D- | 19 | USB_D_N | Native USB | J1 DN1/DN2 |
| USB D+ | 20 | USB_D_P | Native USB | J1 DP1/DP2 |
platformio.iniIni
[env:esp32-s3-devkitc-1] platform = espressif32 board = esp32-s3-devkitc-1 framework = arduino monitor_speed = 115200 build_flags = -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=1
src/main.cppCpp
#include <Arduino.h> static const uint8_t KEY_PINS[8] = {4, 5, 6, 7, 8, 9, 10, 11}; static const char* KEY_NAMES[8] = { "KEY1", "KEY2", "KEY3", "KEY4", "KEY5", "KEY6", "KEY7", "KEY8" }; static bool lastState[8]; static uint32_t lastDebounceMs[8]; const uint32_t DEBOUNCE_MS = 25; void setup() { Serial.begin(115200); delay(1000); Serial.println("ESP32-S3 8-Key Controller starting"); for (uint8_t i = 0; i < 8; i++) { pinMode(KEY_PINS[i], INPUT_PULLUP); lastState[i] = digitalRead(KEY_PINS[i]); lastDebounceMs[i] = millis(); } Serial.println("Keys initialized as active-low inputs with internal pull-ups"); } void loop() { const uint32_t now = millis(); for (uint8_t i = 0; i < 8; i++) { bool raw = digitalRead(KEY_PINS[i]); if (raw != lastState[i] && (now - lastDebounceMs[i]) >= DEBOUNCE_MS) { lastDebounceMs[i] = now; lastState[i] = raw; Serial.printf("%s %s\n", KEY_NAMES[i], raw == LOW ? "PRESSED" : "RELEASED"); } } }
Build & Flash
Bash
pio run pio run -t upload pio device monitor
If flashing fails, hold BOOT (SW9), tap RESET (SW10), release RESET, then release BOOT and retry upload.
Platform & Toolchain
Pin Mapping
`platformio.ini`
`src/main.cpp`
Build & Flash
