Collision Avoidance circuits using ATmega 16

It is all about the sensors...
 
Kindly Share any Projects which is related to Collision Avoidance system...
Kindly tell me a specific sensor for collision avoidance and which is also easily interface with ATmega16
 
ultrasonics are more accurate for distance

Ir is simpler, as it is just a switch ie on/off

if your ultrasonic is anything similar to the one i got:

**broken link removed**

then using the sensor is as easy as decoding pwm, since the sensor outputs pwm pulses relative to distance
 
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