I bought TSOP4838 and want to make this break beam detector by using this device. However I'm not sure what max time and minimum gap should I generate to let it work with highest frequency?
Datasheet said: Minimum burst length 10cyces/burst
After each burst of length a minimum gap time is required of 10 to 70 cycles (>=12 cycles)
So the minimum gap is 70 cycles which means 70 * 13us = 910us (microseconds), how long can I emit 38KHz frequency to let receiver rest and keep good beam frequency?
I also don't understand what this magic word burst mean? Is burst mean the time of 38 KHz freq generation?
I think it must be packed signal: 01010101010101....010101 where 0 means 38KHz wave and 1 means Gap time without 38KHz signal