WEEK 8

For continuation of the hardware development, the circuit for the sensor have been designed. The sensor that I used is infrared (IR) sensor. I used 2 sensor which is on the front right and front left. The sensor will be cover the front view and the side view. There is also variable resistor to control the length of distance between the sensor and obstacle or wall. The sensor provide the detection range between 5cm to 20cm. 

It is the same principle in all Infra-Red proximity sensors. The basic idea is to send infra red light through IR-LEDs, which is then reflected by any object in front of the sensor. Then all it have to do is to pick-up the reflected IR light. For detecting the reflected IR light another IR-LED is going to be use to detect the IR light that was emitted from another led of the exact same type. This is an electrical property of Light Emitting Diodes (LEDs) which is the fact that a LED produce a voltage difference across its leads when it is subjected to light.

Circuit of IR sensor