Pulsing Puberty Heart

I designed this pulsing heart for my daughter hitting currently puberty. It pulses slowly with nearly 60 Hz. If a person is approaching, the pulse quickens. At a distance below 30 cm its really running wild. See the video:https://youtu.be/7WT9LreD2JA
The distance to a person (or thing) is measured by means of ultrasonic, the whole circuit is based on a mini-arduino I designed myself. The schematic and PCB design files are included either. The ultrasonic part is based on the popular module HC-S