we have a project in this subject. our group's idea is an LDR sensor wherein when there is light, the curtain will go up and when there is no light, the curtain will go up. we are planning to use a relay and a motor (dynamo) to control the raising of the curtain. is it possible? any suggestions how we can do our project. we just need a prototype, that's why we'll just be using dynamo. please help us. thanks!