PWM Explorer (source) is an online visualization with sliders to adjust PWM frequency (or period) and duty cycle, and see the effects on the waveform, the average voltage, and a simulated motor and LED.
The Arduino PWM Explorer is a project, that includes code, for students to learn about PWM by adjusting a couple of potentiometers and seeing the affect on (1) an LED and (2) a simulated oscilloscope.
https://github.com/osteele/imu-tools is a set of tools for sending IMU data from an ESP32 and receiving it on a command-line program or in a web application. It includes the source for an npm package that can be used in a web application to receive data via MQTT (any browser) or Bluetooth (Google Chrome).
https://github.com/osteele/Arduino-BLE-IMU is firmware that runs on an ESP32 and relays BNO055 data wirelessly to computer via MQTT (over WiFi) and/or Bluetooth.
https://github.com/osteele/imu-client-examples is a set of examples that use relayed wireless IMU data in various ways: to animate one or more Stanford bunnies, and to graph the data.