INDEX

SUN TRACKER
Sun Tracker is a mechanism which keep Solar Panels always perpendicular to Sun. The maximum radiation is obtained when Solar panel is perpendicular to sunlight, so maximum power. Everyday sun
moves from East to West and a lateral shift of 23.5degree on both sides of normal(i.e, change with seasons like summer and winter).See http://www.eaas.co.uk/news/seasons.html. So we need two axis
tracking. Sun sets at west and our system shut downs automatically when a particular intensity of light is reached (i.e in night and in rain time). When it set at west and during morning it had to come back to east i.e in morning it had to shift 180 degree.. Sun Tracker should work perfectly with Sunlight and in darkroom in presence of sodium vapor lamp.

Sun rotates 180 degree in 12hours time. So we require the movement should be slow in both axis. So first go to mechanical model. This is the first model.The circuit will remain same for both axes. For each axis 4 sensors are used.First about choosing of sensors. LDR is the cheap one and better sensitive to visible light. Photo diode, photo transistor,camera are other options, but they are costly and we don't require that much sensitivity.