I have two pairs of: Arduino Pro Mini and Lora ra-01 SX1278.
I want to make a point-to-point connection between them.
(transmitter will transmit the temperature value. Receiver will recieve the temperature value)
I want you to tell me if I am on the right way:
According to the library 's readme: 'RH_RF95 Works with Semtech SX1276/77/78/79', So in order to try it: File->Examples->Radiohead->rf95->rf95_server, and this is the sketch (you can view the code here) for the transmitter. Am I on the right way?
I have connected Arduino to Lora this way: Arduino....Lora
D2................DIO0
D7................DIO1
D8................DIO2
D10..............SS
D11..............MOSI
D12..............MISO
D13..............SCK
A0................RESET
Shouldn't I let the sketch know these connections?
/// \par Connecting RFM95/96/97/98 and Semtech SX1276/77/78/79 to Arduino
///
/// We tested with Anarduino MiniWirelessLoRA, which is an Arduino Duemilanove compatible with a RFM96W
/// module on-board. Therefore it needs no connections other than the USB
/// programming connection and an antenna to make it work.
///
/// If you have a bare RFM95/96/97/98 that you want to connect to an Arduino, you
/// might use these connections (untested): CAUTION: you must use a 3.3V type
/// Arduino, otherwise you will also need voltage level shifters between the
/// Arduino and the RFM95. CAUTION, you must also ensure you connect an
/// antenna.
///
/// \code
/// Arduino RFM95/96/97/98
/// GND----------GND (ground in)
/// 3V3----------3.3V (3.3V in)
/// interrupt 0 pin D2-----------DIO0 (interrupt request out)
/// SS pin D10----------NSS (CS chip select in)
/// SCK pin D13----------SCK (SPI clock in)
/// MOSI pin D11----------MOSI (SPI Data in)
/// MISO pin D12----------MISO (SPI Data out)
/// \endcode
/// With these connections, you can then use the default constructor RH_RF95().
/// You can override the default settings for the SS pin and the interrupt in
/// the RH_RF95 constructor if you wish to connect the slave select SS to other
/// than the normal one for your Arduino (D10 for Diecimila, Uno etc and D53
/// for Mega) or the interrupt request to other than pin D2 (Caution,
/// different processors have different constraints as to the pins available
/// for interrupts).
The transmitter outputs absolutely nothing in the Serial Monitor Window (no matter which baud rate I selected in the baud rate list).
Not even garbage.
In the program I changed from 'Serial.begin(9600);' to 'Serial.begin(4800);'.
When I remove the Lora from the board the Serial Monitor works (9600 in the baud rate list).
When I put Lora in it's place on the board, the Serial Monitor does not work.
So I have to issues:
I have to put in the program Serial.begin(4800) in order the Serial Monitor to work at 9600.
Serial Monitor doesn't work with Lora on the board.
I 'm using Arduino Mini Pro, exactly like this one.
I 've checked all connections between Arduino and Lora, everything seems ok.
(also checked all connections in general)
EDIT: I replaced it with the Arduino I use in the receiver and the Serial Monitor works. So, problematic Arduino board?
Yes, no initialisation, no communication with he board established.
Potential causes:
software setup wrong (wrong pins selected),
wiring wrong (poor solder joint, bad breadboard contact, miswired),
LoRa board faulty.
If you have an Arduino board that doesn't print anything to the Serial monitor (use some minimal example to try this out and make sure the baud rates in the sketch and the Serial monitor match), it itself may be faulty.
I managed to make it work! (with the arduino-Lora library suggested by Riva)
I had two mistakes on my boards:
1.no GND for Loras on both pcbs
2. one track was shorte to GND
But now I have another problem: they communicate only at a distance of 10 cm!!!
If I move them to 15cm from each other they don't communicate!
Let me stress that from the very beginning I had soldered their antennas, I never worked them without their antennas because I had read they could get damaged.
What now?
For the transmitter I use a Lipo battery with a voltage of 3.6V (not 4.2V).
For the receiver I use a 1117 with 3.3V output.
I did not breadboard it because with breadboards it becomes super complicated with lots of errors.
In order to avoid errors I made it directly on a pcb. And I made 2 errors!!
srnet:
Classic symtom of modules with damadged RF outputs.
Oh 4$$$$it!!! I did everything for this not to happen and it happened!
As I mentioned earlier, a track was by mistake, grounded. This track was connected to MOSI pin of the Lora.
Could this damage the RF?
