To avoid confusion, it is very important to specify the exact function of the cows.
Cow 1: Seeing
There is a photo cell hidden beh
ind the cow to measure the level of light. When it is light enough, the eyes/LEDs will be on - the cow can see. When it is too dark, the eyes will be off.
I decided not to use the ping sensor because of two reasons. Firstly, it is very difficult to make the ping sensor invisible. Secondly, in case of an exhibition, complications may occur if the sensor is accidently covered.
Cow 2: Hearing
A ping sensor hidden can sense the frequency. When the signal is above a certain threshold, the LED light up.
Cow 3: speaking
Something I am interested in, but have not done before, is a randomizer. I intend to store some short melodies and led them play at a random time and order. That will give the appearance of the cow having an own mind. Sound is played with a ping sensor.
A sketch helped me to connect the right wires to the cows.
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