Crowtail- Sound Sensor and Touch Sensor

Crowtail- Sound Sensor can detect the sound loudness of the environment. The main component of the module is a simple microphone to receive the sound signal, with band pass filter and a LMV358 amplifier to make the output signal easy to be received by microprocessor. 
    
This module outputs analog signal that shows the relative loudness. Besides, an on-board potentiometer can be used to adjust output voltage.

Crowtail touch sensor can detect the human touch by sensing the change of capacitance. Based on the touch IC TTP223-B, this module can detect human finger in 0~3mm, that is, you can place this sensor under a non metallic surface such as the glass or paper, with thickness less than 3MM, this would be useful for applications that waterproof is needed, or you want to make the buttons secret. 
    
With the panel mount design, that is, the side of touch pad is smooth. Elecrow Crowtail- Touch Sensor is easy to install in projects, users can easily install it onto cases or other internal materials.