Prepare the tools and materials
To make things clear, I took some photos of the components.
i) Electronic Components:
Logic DC Jack (Mainboard) from Techbox Tricks ×1
Grove – Universal 4 Pin Buckled 20cm Cables ×2
Grove - Tilt Switch（backorder）
Grove– Buzzer ×1
9V to Barrel Jack Adapter ×1
9V Battery ×1
Glue Gun ×1
Step 1 Connect the logic DC jack with the buzzer, tilt switch and battery using cables.
Step 2 Fix them on the top of the pen. Note that the tilt angle should be small but not zero.
Step 3 Now you get a prototype of the writing posture correction pen.
Step 4 Decorate the pen with clay. And you can make any clay doll as you like.