Rc signal help

[Jumper]

Hi,

I am not a big fan of PULSIN. It is sometimes hard to know what is happening so I prefer setting up timers to measure things myself. There are several posts in this forum how to use timers and it is really not that hard. If you pick a 16 bit timer and set the prescaler to 1:1 you can measure up to 65 ms without overflowing at 4 Mhz and 2.55 ms with a 8-bit timer and getting a nice resolution. The RC signal shouldn't be hard to catch this way.

If you have tried everything else, Timers might be worth a try.



/me

[geckogrotto]

Ok im feeling really dumb but may have it worked out. Doing some tests

[geckogrotto]

Ok man I found the problem it was infinite resistance between the keyboard and chair

Its working now. Working on cleaning up the code and will post new code when i'm done... It wasn't my code that was the problem it was me lol

[Acetronics2]

Hi, Gremlin - lotto ( ! )

The blinking rate could help ( US, European ... ??? ) ... thanks.

Alain

[geckogrotto]

Ok so here it is Im stupid was the main problem. Somehow I figured that the signal would just come pouring out of that little white wire without any ground to the signal cable... Once I got over that blonde moment everything fell into place. The code below could be done a lot better and some saftys put in for wild RC signals but I wanted to get out some working code.
Basically by moving the stick back and forth it will figure out whats the max high and low and then accept anything thats about 1/3 of that in that direction. Now that its clear as mud here is the code

'12F675
@ __CONFIG _INTRC_OSC_CLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF
OPTION_REG.5 = 0                                                       ' clock source internal

Pulselen   var Byte                                                 ' Pulselen can be 0 - 255, 100 = 1 ms, 200 = 2 ms
Init       var Byte                                                 ' Init used to flash LED
HighCode   Var Byte
LowCode    Var Byte
clear
highcode = 0 ' setup vars to be changed
lowcode = 200 ' setup vars to be changed
Input GPIO.3                                                           ' set pin 5 to RX signal

ReadPWM:
   PulsIn GPIO.3, 1,Pulselen                 ' pin 4 - read high pulse length, times out after .65535 seconds 
If pulselen > highcode then Highcode = Pulselen ' make sure highcode is at full throw This will avoid having to go though a setup
If pulselen < LowCode and Pulselen > 50 then Lowcode = Pulselen ' make sure lowcode is at full throw This will avoid having to go though a setup
if (Pulselen + 20) >= highcode then
   For Init = 1 To 6                                                 
      High GPIO.1                                                      
      pause 60                                                      
      Low GPIO.1                                                     
      pause 60                                                      
   Next
pause 1000		    
 endif
If (Pulselen - 20) <= LowCode Then 
      High GPIO.1                                                      
      pause 3000                                                      
      Low GPIO.1
      pause 200
endif

   GoTo ReadPWM

[malc-c]

Yup - works here too - using a JR X3810 transmitter and cheap and chearful GWS RX

We got there in the end

[malc-c]

I've changed your code a bit to make a simple RC Switch that turns on GPIO.1 in real time (ie activate the switch on the TX and the LED lights or goes out)

I've also removed some parts that are not needed (input GPIO.3 for example as PULSIN automatically makes the pin an input)

'12F675
@ __CONFIG _INTRC_OSC_CLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF
OPTION_REG.5 = 0                                                       

Pulselen   var Byte                                                   
HighCode   Var Byte
LowCode    Var Byte
clear
highcode = 0 ' setup vars to be changed
lowcode = 200 ' setup vars to be changed
                                                          

ReadPWM:
PulsIn GPIO.3, 1,Pulselen                 
If pulselen > highcode then Highcode = Pulselen 
If pulselen < LowCode and Pulselen > 50 then Lowcode = Pulselen 
if (Pulselen + 20) >= highcode then High GPIO.1                                                      
If (Pulselen - 20) <= LowCode Then low GPIO.1                                                   	    
GoTo ReadPWM

Good result for the end of the day.