This is the outcome of my earlier 'Doppler Dabblings'
• ‘PRESENCE’ detects movement and converts it into sound.
• This installation uses a Doppler Radar module (as used in automatic door openers and intruder alarms), the output pulses from the radar are fed into amplifier modules (all concealed within the doll) and finally a speaker.
• The Doppler effect describes the shift in the frequency of a wave when the wave source is moving e.g. the change in pitch in the sound of a siren that is moving towards or away from you.
Doppler Radar and Audio Amplifier Modules, Old doll.
Sensing Radar Doppler Movement Detection