DingbOtto

When an Otto robot (https://www.ottodiy.com/) meets a dingbot (https://www.girlgeniusonline.com/) the result can only be a DingbOtto.

The internal mountings allow for:
1x power button (8.5mm square)
1x additional button (same)
1x piezo buzzer (12mm diameter, 9mm deep)
1x MAX2719 8x8 LED matrix (controller board under matrix, not adjacent)
1x CC2541 bluetooth module
1x TTP223 touch sensor
1x LM393 based sound sensor
1x HC-SR04 ultrasonic distance sensor
1x MPU-6050 IMU
2x LED (5mm)
1x Arduino Nano on a sensor shield
1x Dual 18650 battery holder providing regulated 5V output

There is sufficient room between internal components to allow push-on Dupont connectors to be used rather than having to solder directly to the boards.

Assembly and example programming can be copied from the Otto Humanoid project at https://store.ottodiy.com/product/humanoid. Download link goes to https://uploads.strikinglycdn.com/files/14ccd14c-51a8-43b4-a3ce-8ca2de4b5afd/OttoDIYHumanoid.zip.