There are some arduino modules that can used without arduino board, such as motion sensor module, light sensor module, etc.
Avoidance sensor module also can use without arduino board.
here i used it for make a simple switch for AC or DC load. you can use it for kitchen cabinets light for example, so when you stay near each cabinet part the light above that part run, i think that is amazing idea for optimizing power consumption and i think there are not similar commercial in electric markets.
The sensing distance range is between 2 to 30cm.
Avoidance sensor almost is similar to ultrasonic sensor but with lower sensing distance range and unfortunately high sensitivity to sun ray, also it can't calculate the distance and just sense existing an object in the way so usually used in robots for inhibit collision with wall or other objects.
