RF Modules

[ruijc]

Hello danielhr77,

thank you for your support.

Tony's code is just a sample and not the entire code, but Yes...i did tried the the Serin/Serout lines on my code and didnt worked!

I'm using 4,24V on both RX and TX modules to power them up.

Have you got these modules also ?
Were you able to use them correctly ?

[DanPBP]

I bought them but I haven't tried them yet... Next month I'm going to test them with my application...

I don't know if 4.24 volts is fine, maximum is 4.20 according to the manual, just in case to test, add a diode to reduce it a little.

A few questions to rule things out:

1) Are you enabling them? (pin 5 active low)
2) Are you using a 1k resistor between the PIC and RX (pin 3)?

That's all right now, it's 6:30 in the morning and I'm going to bed...

[ruijc]

Hi danielhr77,

Followed your guide lines...

add a diode to reduce it a little.

Done...result is the same

1) Are you enabling them? (pin 5 active low)

Yes...i'm using pin5 low

2) Are you using a 1k resistor between the PIC and RX (pin 3)?

I wasnt...but i just tested this also and the result is the same

Also, i programmed on both modules the channel like:

DEBUG $af, $20

If you remember any other pointer for me to check i will be gratefull

My best regards

[DanPBP]

Hmm... Do you have the correct baudrate? There's nothing else I can think of, maybe Tony has more ideas...

[ruijc]

Yes...19200 on both

I'm too without ideas.

If someone has any suggestions i would be gratefull.

[Archangel]

Also, i programmed on both modules the channel like:

DEBUG $af, $20

Did you Pull pin 8 low before sending data and return it to High after? And did the module respond the way the Almost_A_Data sheet said ?

[ruijc]

Hi Joe S. and thanks for your help,

Yes i did...I have a led connected to each one. The modules ( after sending the channel number ) light up the leds for a second confirming the channel change.

[Archangel]

Are you using a max232 or similar between the transceiver and the PC or between the other transceiver and the PIC ? The PIC operates in the 8N1 True mode and should have a pull up resistor on it's line, whereas the PC operates in the 8N1 Inverted mode and requires a level shifter to make it true.

[ruijc]

Hi Joe S.,

the modules are connected directly to the pics.

One thing i noticed and i found it weird is that when turning the power on the receiver ( and always the RX - never happened to the TX ) sometimes does not start receiving ( although the TX is transmitting ).

My workaround is to turn power off for a couple of seconds and reconnect power ( and sometimes i have to do this 2 or 3 times ).

I changed modules, experiment board, etc and this only happens on the RX side.

Should it be any startup procedure sequence for the RX ?