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If you give it a sequence of properly timed gap-separated bursts, the output will be low during a burst and high during a gap with a slight delay in each case. Dan My current program for the 12F is set up for reflect mode, so no problem.
I also have a set up for break beam, problem. I am using timer 0 rollover flag as counter. I think that if I could toggle the PWM. OE during the time of no train and continuous during the train present? Or as you suggested synchronize the interrupts. Now how do I get it done? Not able to attach file, access denied. Grandpa Jay My current program for the 12F is set up for reflect mode, so no problem. I think that if I could toggle the PWM on and off during the time of no train and continuous during the train present?
If you are asking if I will write the application for you then, I already did that and sent the projects to you in a Private Message some time ago.
If you are asking if I will fix your program then, no that one is for you to work out. I was asking if you think that it could be done at a much slower rate using the timer 0 roll over.
Your setup was 1ms on and 1ms off. The timer 0 roll over would be about 0. My second question is what could be done to control the pulsing only during the time that a train is not present. Thank you for your help. The paper clip does not work. This device is designed to detect brief burst of a 38KHz carrier frequency infrared light. The minimum detectable burst is 6 cycles of the 38KHz carrier. The longest suggested bust length is 38 cycles of the 38KHz carrier. The minimum gap between burst is suggested to be more that 4 to 6 times the burst length.
A possible implementation: Turn on the 38KHz carrier frequency. If TSOP IR receiver does not detect a beam during this one millisecond time turn off the 38KHz carrier frequency and assert that the beam is blocked. Wait for 3 milliseconds then do it again. It "should" be straight forward to implement this within the code framework you and JorgeF have worked out. The code I sent you does this using interrupts and several other method commonly used by many embedded programmers. Until you gain more experience these techniques may look way to complex.
You should always write code you truly comprehend. When you gain some more experience your code will become clearer and more elegant.
Dan Thank you for the information. That is what I needed. I will see if I can work it into my program. Some things are easier with older PICs. I hav no idea as to what would be a good device to get. Other than the 16F88 they are mostly free samples. I have used the 16F88 is asm code for small motor control, servo motors and stepper motors.
I have used the 16F in a train controller with the help of Ric. And the 12F with your help to control servo motors. What would be your suggestion as to what chip I should use? I have enough trouble with one chip let alone a slave. This is getting to be a big problem. If I pulse the IR output how can I tell the difference between the pulse and the gap between the cars? This I have no idea how to accomplish, "sample the sensor output, which will be " one" cycle before the end of the envelope pulse"?
You have to be kidding. I may be better off sticking with the reflective mode. The Timer 2 ISR would read the sensor once every two interrupts, and update a bit variable of the sensor status approximately times a second. That's fast enough to detect the gaps between cars even if the train was supersonic! Transfer money to a bank account or for cash pickup. The Western Union Company is a financial services and communications company based in the United States.
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