Pulsin Math question

[ruijc]

Thanks Mister-e,

makes perfect sense

Just curiosity... what does this formula mean then ?

( For a pulse of 1.5ms and 10Mhz clock ) : 150*10/4=375 counts

thanks

[ruijc]

Thanks for the tip Acetronics

What do you sugest ? What will it work better ( for a Futaba RX ) ?

.

[Acetronics2]

Thanks for the tip Acetronics

What do you sugest ? What will it work better ( for a Futaba RX ) ?

.

1) I always use 25ms for PULSIN_MAX ...( add the pulse duration and it's Ok for all ! )

2) Ah, Futaba RXs !!!

Some care has to be taken for Futaba and Sanwa, some of their receivers output a ~ 3.5v high level ...

So, They will work with a TTL input, but not with a Schmitt trigger input ( as PortB.0 in interrupt mode i.e ...) : it will work with a PULSIN PORTB.0 , but not ON INTERRUPT (i.e.) ... that can offer happy debugging times !!!

Alain

[ruijc]

Thanks Mister-e

... that can offer happy debugging times !!!

Thanks Acetronics

To protect the hardware i was thinking of placing a 220 Ohms resistor between the RX and the Pic.

Hope it works

.

[Acetronics2]

To protect the hardware i was thinking of placing a 220 Ohms resistor between the RX and the Pic.

.

From the Rx outputs , one might consider not to draw more than 1 mA in all circumstances ... so, 4.7k in series, and 100k for an input Pulldown are safe values. 47k in series do not introduce significant noise levels ( 470k then for Pulldown !!! )

Alain

[ruijc]

Thanks for the tip Acetronics,

OK...( let's see if i understood ) will use the 4K7 between RX and Pic and the 100K pulldown for the pic's input pin.

Thanks

[mister_e]

10 to 4 Mhz conversion i guess...