Generate the basic notes of a piano using Fast PWM.
Project tutorial by Rishabh
Type your set password using the keypad and open the door lock.
Make use of infrared receiver to receive signals and control the relays
The ESP system make it easy to recognize gestures you make using an accelerometer.
Project tutorial by mellis
What's the error
I don't know anything about this particular website , but yeah the idea is good
Sure , since the cost of the components used is really really low . And the ease with which these can me implemented , even by those who have no technical backround , is high
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