From the picture, we see it is a kind of big, but anyway I like it! The cool lighter is attractive. Different from traditional cigarette lighter, it kindled by arc, controlled flame by bottom-touch. The touch bottom uses the function touch from GPIO itself of FireBeetle Board-ESP32. What’s more, it is a watch too.

Hardware in need:

High-voltage booster coil for Arc lighter ×1

NPN Triode×1

51Ω Resister×1

1KΩ Resister×1

1N4007 Diode×1

Powerful Triode×1

ESP32 WiFi & Bluetooth Module×1

FireBeetle Covers-Proto Board×1

FireBeetle Covers-24×8 LED Matrix×1

3.7V Lithium Cell×1

Hardware Connection

Schematic and drawing, shown as below

Soldering electronic components to FireBeetle Covers-Proto Board according to the image and connects a control pin of lighter to D3 of FireBeetle Covers-Proto Board by wire. You can also connect to D3 of FireBeetle Board-ESP32 directly, for the compatibility of FireBeetle series is great! Connecting Vcc to Vcc (Covers-Proto Board), GND to GND (FireBeetle Covers-Proto Board).
P.s I am so sorry if you do not understand the drawing.

1. Connecting touch wares.

FireBeetle Board-ESP32 has touch function itself and I chose T3 (A4) and T5 (MCLK/IO12) to be connected. (If you are confused about the reference pins, FireBeetle Board-ESP32 user manual could help you.)
2. Connecting LED light board, FireBeetle Board-ESP32 and soldered expansion board, shown as below.

About connection, I put pin and female pin together and put the lithium cell between them.
Crust assembly
The curst printed by overlord 3D printer, you can click here to download the source document.
Firstly, let the touch-sensitive wires go through the bottom assembling holes reserved before respectively, shown as below.

Secondly, heating screws and spring washer with a heat gun to fix them to crust easier and more convenient (this is the touch bottom).

Do not touch a spring washer by hand.
Fix the spring washer to crust, ensuring the connection between plate and wires.

Caution: The two output wires of high voltage coil should go through the crust.

Thirdly, fixing the whole crust with hot melt adhesive. Connecting wristband and cigarette lighter with magic tapes respectively, shown as below.

Fourthly, download the program to the cigarette lighter.
Click here to download the source code.
Finally, well down!