serout and rf modules

littlerich

Hi,
I have a BS2P40 and have come across a pair of rf modules.
Documentation is unfortunately thin however here is where I'm at.

connections as follows:
1 power supply Gnd
2 3.3 to 5v power
3 Rxd/TTL level
4 Txd/TTL level
5 digital ground
6 Tx/RS-232
7 Rx/RS-232
8 sleep TTL high level sleep
9 reset

There is a windows app to go online to the module and change channel etc. I can do this by providing power and using pins 6 and 7 above to serial port on the computer.
Also from here I can enter some data and manually Tx and there is a red led on the unit that indicates data tx'ing I assume.

On the 2P40 I just want to transmit and on another Rx
So have used power and tried both pin 4 or 6 of module connected to X15 (pin20) on the 2P40

yet i have never seen the Tx led light up yet.

' {$STAMP BS2p}
' {$PBASIC 2.5}

Radio_Tx CON 15 'Radio on pin 16
Radio_Baud CON 110 'Radio baud 9600 8-N-1 copied from serial LCD program

Main program which call subroutine Radio_update

Radio_update:
SEROUT Radio_Tx, Radio_Baud, [noparse][[/noparse] x ]
PAUSE 100

RETURN

I have tried lots of different things between the brackets.

I am unsure of the CON 110 data except to say it works on the Serial LCD module. I am not sure where the chart is for deciphering this.

Also unsure whether I should be on pin 4 or 6 and whether any hardware is required inbetween (MAX232??) or infact whether any form of initialisation string is required.

Any thoughts appreciated cause this newbie is confused.

Cheers
Richard

Unsoundcode

Hi Richard, the pinout of your device describes the rf module as being able to accept·TTL (5 volt)·serial input so you should be able to make a direct connection to your Stamp (MAX 232 not needed).

I think the baud constant should be 240 for 9600 on the BS2p (Radio_Baud CON 240) you can double check by looking at the help file that comes with the IDE.

It also looks like Pin 3 of the rf module (RXD/TTL)·is where Pin 15 of the Stamp should be connected for the module to receive data.

Jeff T.


EDIT that should have been P15 (Pin 20)

Post Edited (Unsoundcode) : 11/11/2007 3:32:03 PM GMT

Franklin

And don't forget the digital ground.

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- Stephen

littlerich

Thanks guys.
The digital ground I had not connected as I wasn't useing sleep or reset function, do I infact need to connect this to the same point as pin1 0volts ??


I appreciate the help.
Rich