Hello all, I am designing an IR curtain with TX array on one side and RX array on another side. TX side controller and RX side controller are different not same. I am using timer on both side for synchronization but i am not getting results. I want to synchronize transmitter and receiver without any GPIO line. I want to synchronize it with IR -Tx and Rx sensor. If any one has idea how to synchronise it please help me.
Regards, Sagar
any decent UART will be 'synchronized' if both UARTS are set to the same baud rate
I don't think this involves any UART.
I think the IR curtain in the OP:s post is multiple beams functioning more like a burglar alarm. But I fail to realize the synchronization requirements. An ultrasonic "curtain" would need to know the timing to compute the distance where the sound reflected - but an IR-based curtain would normally just try to detect broken beams and not try to worry about the speed of light and phase difference between outgoing and reflected beams.
But the big problem is - as is quite often the case - that people tends to create threads and asks questions while spending way too little time making sure they supply enough information for the questions to make sense to other people.
Hello Per Westermark, First thanks Per Westermark for your valuable feedback. From IR curtain i want to detect shape of moving object.If i will not synchronize Rx and Tx side controller i will lose the exact shape of moving object. I tried to synchronize both sides of controller through timer but i failed. Then i tried to synchronise both controller from out put of first IR sensor but i failed when object is in front of first IR sensor. As i want the shape of moving object it is necessary to synchronise both controller.
Tried to synchronise from first sensor: Rx side:
{ 1. check all sensors output 2. wait for first IR sensor to be detect-> again go to 1 }
Still little information.
I'm not sure why you need to know what the sender does - does the sender somehow modulate the beams?
Because else I would expect the sender to just be a number of beams transmitting continuously, and the receiver detects at what times the individual beams gets blocked or reaquired. This can work quite well to detect a two-dimensional shape if the object moves at a known speed. Having additional beams besides the main curtain helps to detect the speed as long as the object is not changing shape - a human swinging their arms is harder to handle.
Or are you trying to save on electronics by flashing the individual beams in a sequence and have maybe a mirror or similar and end up with a single detection signal - so the receiver needs to know which of the individual beams that is currently detected? An alternative to that is if you can modulate the beams so there are a high-frequency component that specifies beam ID while the low-frequency component is "object blocking beam" or "object not blocking beam".
Hi Per Westermark,
I am using an 8051 controller,and with one controller i am handling 9 receiver on Rx side and there are 9 controllers serially with there 9 receivers on it.
On Tx side also i am using 8051 with 9 transmitter and 9 controller serially with there 9 transmitter on 1 controller. I am trying to save on electronics by flashing the individual beams in a sequence. On Tx side i am making 1st ir transmitter ON then make it off, then move to next ir transmitter and so on. After 9 successive ir transmitter i am sending ack signal to another controller to start its transmission in a sequence. On Tx side i am modulating beam so on receiver will come to know which Ir transmitter is on.
I am sensing ir modulated signal on reviver side. After one complete scan i am sending revived data from all 9 controller to PC for image formation.
In above case i am not able to synchronise Tx side and Rx side.