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Mini Mochi Bot (ESP32-C3) — Build Notes

This repository documents my build of a Mini Mochi Bot powered by an ESP32-C3 Mini and flashed directly using the official Mochi Web Installer by Huy Khong.

• Wiring notes
• Hardware list
• Flashing method
• Photos / documentation of my build

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✨ Overview

Mini Mochi Bot is a small OLED-based companion device that runs the Mochi firmware from Huy Khong. My build uses:

• ESP32-C3 Mini
• 0.96" I²C OLED
• TP4056 Type-C charger
• TTP223 touch key
• Active buzzer
• SPDT slide switch
• 3.7V LiPo battery (WLY102040)

I flashed Mochi entirely through the browser, no PlatformIO or esptool needed.

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🧱 Hardware Used

Component	Model
MCU	ESP32-C3 Mini
Display	0.96" SSD1306 I²C OLED
Battery	WLY102040 3.7V 800mAh LiPo
Charger	TP4056 (USB-C version)
Touch Sensor	TTP223
Buzzer	Active electromagnetic buzzer
Switch	4mm SPDT 1P2T
Extras	Wires, double tape, heat-shrink

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🔌 Wiring (My Build)

OLED (I²C):

• SDA → GPIO 6
• SCL → GPIO 7
• VCC → 3V3
• GND → GND

Touch Sensor (TTP223):

• OUT → GPIO 1
• VCC → 3V3
• GND → GND

Buzzer (Active):

• • → GPIO 2
• • → GND

Battery + Charger:

• TP4056 BAT+ → LiPo +
• TP4056 BAT- → LiPo -
• Output of TP4056 → ESP32 5V / VIN

Switch:

• Inline with battery output to ESP32 power

⚠ Pin numbers vary depending on your board revision; adjust as needed.

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🚀 Flashing Mochi (Huy Khong Web Installer)

This build uses Mochi from the official website, not custom firmware.

1) Requirements

• Chrome / Edge browser
• USB-C data cable (not charge-only)

2) Flash Process

1. Open the Mochi Web Installer.

2. Connect ESP32-C3 to your PC.

3. Enter bootloader (if needed):

   • Hold BOOT, tap RESET, release BOOT

4. Click Install / Connect

5. Select ESP32-C3

6. Wait for flash to finish

7. Reset the board

3) First Boot

• OLED should display the Mochi face

• Bluetooth may appear as Mochi

• Touch sensor triggers sound/interaction

• You can see my setup/FLASHING for more detailed Flashing step-by-step process .

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🧪 Troubleshooting

OLED blank:

• Power cycle
• SDA/SCL reversed
• Display pins not fully seated

Bluetooth not showing:

• Reset board after flashing
• Ensure no old pairing exists

No sound:

• Check buzzer polarity
• Buzzer must be active type, not passive

Touch always triggered:

• TTP223 too close to metal or wiring
• Adjust sensitivity jumper if needed

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🖼 Photos

docs/images/

📜 License

MIT — free to modify and share.

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🙌 Credits

• Mochi Firmware: Huy Khong
• Hardware build & documentation: Me =======

mini-mochi-bot

Mini Mochi Bot built using an ESP32-C3 Mini and the official Mochi firmware (Huy Khong). This repo contains wiring diagrams, flashing instructions, and build notes for recreating the project.

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