In the below link the PWM was used to control DC motor....Why PWM is used to control the DC motor???? #-Link-Snipped-#

I have made the above project for a competition and I have more time and was looking to add text to voice conversion to this, but most text to voice...

I want to make this project for a open house projects exhibition, but I am not experienced with USRT based finger print sensors / readers, any suggestions? TIA. #-Link-Snipped-#

Dear Sir, The idea is to both learn and make the idea, will study your suggestion as well.

I am trying to make this automatic rain cover system that extends a shade for my dog, when it is raining, but there is some electrode shown in the circuit...