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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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12th May 2008, 02:18 PM
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| Experienced Member   |  I should have put some notes out to the side of the program. When I fix it later I'll write a lot of side notes. Here's my logic transmitter: Do ADC. Send a fixed IR signal followed by a minimum gap for whenever you send a value close to zero. (if not the IR receiver will turn up the gain and stop receiving) wait an amount of time based on the ADC, then send another IRpulse to tell the receiver to stop counting. receiver: listen for the IR receptor to drive the pin low, wait for pin to be high again and start counting. First count the minimum gap time, then start counting the value to be used in the main program. When the pin is driven low again stop counting. Do PWM. So I hope that helps this to be clearer. Now I'm doing two channels...send a pulse then data1 then a pulse then data2 then a pulse.....but now I need some kind of really long pulse to lead the data to let the receiver know to start counting data1 then data2.
__________________ jeremy |
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15th May 2008, 04:03 AM
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| Experienced Member  | Hi jeremy are you with me? Yes I think you are with me.I have written a code for you specially the transmitter part.But I haven't checked it yet. I'm sending a data packet through IR LED.Don't know whether you like it or not but I have to do.Just go through it. Code: GP0=button (active low) GP1=IR TX LED ;************************************* ;Che_But - sends one packet at a time ;************************************* Che_But btfss GPIO,GP0 ;has the button pressed? goto $+2 ;yes, goto Che_But ;no,then wait until press call Transmit ;transmit the packet btfss GPIO,GP0 ;button still pressed? goto $-1 ;yes, goto Che_But ;no,has released, ;******************************************************** ;Transmit - routine sends data in the packet (brightness) ;******************************************************** Transmit call Check_AD movlw .8 movwf Counter ;makes counter for 8 bit Loop3 bcf STATUS,C rlf Brightness,F btfss STATUS,C goto Do_Zero goto Do_Ones Do_Ones movlw d'22' movwf Highpulse ;makes 600uS high time goto $+3 Do_Zero movlw d'12' ;makes 300 + low time movwf Highpulse call Do_Logic ;transfer the logic call Do_Gap ;transfer fix gap time decfsz Counter,F ;repeat for other bits goto Loop3 return ;************************************** ;Check_AD returns the brightness value ;************************************** Check_AD bsf ADCON0,GO btfsc ADCON0,GO goto $-1 movf ADRESH,W movwf Brightness ;brightness contains dim level return ;******************************************** ;Do_Logic - logic high time > logic low time ;******************************************** Do_Logic Loop1 BSF GPIO,1 ;27 commands makes 38khz goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 BCF GPIO,1 goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 decfsz Highpulse,F goto Loop1 return ;***************************************** ;Do_Gap - a fix gap time min 300us needed ;***************************************** Do_Gap movlw D'12' ;makes a fix gap after burst = 300uS movwf Lowpulse Loop2 nop ;27 commands makes 38khz goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 nop goto $+1 goto $+1 goto $+1 goto $+1 goto $+1 decfsz Lowpulse,F goto Loop2 return
__________________ Gayan Forum Supporter |
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15th May 2008, 05:20 AM
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| Experienced Member | very nice. I like the roll folder left to transmit exactly the value you want. Looks like a good way to get a precise number. I'm just counting the gap, whereas you are sending the 8 bit number one bit at a time. One thing I see is that you need to send a unique pulse before the whole thing so the receiver knows that it's the beginning of the packet being sent. I see that you have the button so that it only sends one packet at a time, but if it catches it in the middle or gets the first bit of interference from a light in the house it will be out of sequence. I'm crazy busy at work lately, but I'm going to build your code and try it when I get a moment. Also, I've almost got my two channel code going. Big long IR pulse to mark the start of the packet then gap, small pulse, gap, small pulse. Then I'm going to use a lightened micro servo to turn it. Soon I'll have control of this foam, pager motor pulling, scotch tape, toothpick braced junker.
__________________ jeremy |
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15th May 2008, 05:33 AM
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| Experienced Member | Quote:
 A similar technic that I used in my IR projects.Thats a clever technic.So you no need to worry about the resolution or time takes to transfer. 8 bit resolution is more than enouth to dim a LED smoothly or to speed control a DC motor.
__________________ Gayan Forum Supporter | |
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