Tinycorder Version 2 (updated July 6, 2025)

The code is completed with the following changes:

• The timer function is completed, allowing you to set blocks from 5 to 120 min. In the 25min block, a "Pomodoro Timer!" message appears. When activated, it starts a countdown and, when finished, notifies with a flashing label on the screen.
• The Dashboard menu is completed, showing CO2, temp, and humidity measurements as a histogram, with measurements every 5 min up to a total of 24 for each variable. The time between samples can be changed in firmware to take a longer total sampling time.
• The "Air Quality" menu presents CO2, temperature, and humidity measurements every 5 seconds continuously, until you return to the main menu.
• The "Spectrometer" menu was already working but has been improved. Now it can display the spectrum as a histogram, lines, or numeric; you can switch between any of them or return to the main menu.
• The "About" menu has been improved in appearance and presents basic information.
• The oscilloscope function has been removed for now. It may be addressed in the future.
• All the text and menus in english
• The changes are update in github. Also uploaded the new .ino file here.

Pending changes:

• Add a small buzzer to give sound to the device.
• Add a time-of-flight sensor to measure distance and perhaps generate a kind of "sonar".
• Optimize power consumption by better managing deep sleep processes.
• Option to enable/disable LED for flashlight, using those on the spectrometer sensor.
• Battery voltage control to see autonomy on screen.
• Try other, more economical displays and redesign the hardware. The Sharp is very good but somewhat expensive.
• Create the PCB. It is currently a perfboard as it is a prototype.
• What else...?