Jumper to enter setup

[Bobbo_ZA]

Would be easier you to tell what you want to do with those " jumpers " ... a jumper is someting easily removable ... so, there's something I do not understand here ...

Alain

soft example:

Jumper is active LOW

'******************************************************************************
' check if programming jumper not forgotten ...
'******************************************************************************
 delay = 0
 BUTTON Prog,0,255,0,delay,1,mesurav
 
oubli:       ' infinite loop ... jumper MUST be placed ...
 error = 1 ' Blink the led !!!
 PAUSE 50
 error = 0
 PAUSE 50
 
 GOTO oubli
 
'****************************************************************************** 
'******************************************************************************
' Measure programming pulses
'******************************************************************************
'******************************************************************************
 
 
'******************************************************************************
Mesurav: 'Measure Forward Max pulse
'******************************************************************************
 Show = 1 ' programming led ON
 Entree = 0
 
 GOSUB Mes
...

Sorry, basically, all the jumper is doing is on boot it the Pic check if it is "on" and then goes into a setup mode to sense the Transmitter stick location.

What I have done this evening is resolder another board and manged to bridge accross on another PIN (one I had designed onto the same PCB for LED lighting) and got it to work. Its not "pretty" but now functional. I would still like to find a way to use the pins that are now unconnected untill the jumper is installed and then pulled up to +ve.

Worst case, is there any harm of leaving the pins floating if I am not using them for input or output? would mean I can use these PCBs for now and then fix the design in the next batch I have printed (sounds commercial, :-), not for sale but making some onboard glow / LED light drivers for some mates at the flying field.

[mackrackit]

Make all of the unused pins an OUTPUT and code them LOW near the beginning of your program.

[Charles Linquis]

Again, the method I outline above will allow you to determine if a pin is completely open, or else connected to one of the rails via a resistor.

I had exactly the same case, where a board layout was incorrect. I needed to figure out if a jumper was on or not. "Little green wires" or added resistors were not an option.

I'm not advocating this method for production. But it can fix a bad situation.

[Bobbo_ZA]

Hi Charles,

I will give your option a go tonight, :-), should work for what I need it to do. Was thinking to monitor the pin for a few cycles and if it floated to read it as open and if it was high to read it as closed / Jumper on.

had a closer look at the circuit and I may be able to squeeze a 0402 or 0805 under the PIC's socket from the pin to the GND track, although there are no pads it should solder to the track - 0.25mm track width - if i can get it in there then I would read the pin as LOW for "open / jumper off" and high for "closed / jumper on" :-)

I like your option though as it keeps the compnent count down which is what I was aiming for as hand soldering 0402's is quite a challenge, :-)

Many Thanks

Kind regards
Rob

[Bobbo_ZA]

Error, :-( looked at it last night and cant use the track under the PIC, will have to try the "Slam-read" option which seems viable or use the other PIN and leave that side empty until I have some more printed.

Question to Alain, have you manged to code a section in any programs you could share where you check if the user has a Futaba or a JR TX?

It seems the PIC reads Throttle low-high on a JR as +- 100-200 and a futaba as +- 200-100.

Cheers
Rob