Hi all,
so I'm using the sketch attached below with rfm95 and I get really weird results;
I have atmega 328 run with internal 8mhz oscillator connected to the rfm95 with the following connection:
D9 to RESET pin
MISO/MOSI to MISO/MOSI (default atmega328 pins)
D2 to NSS
and SCK to SCK (default atmega328 pin)
sometimes the init works and sometimes it doesnt, I would obviously suspect connectivity.. but heres the catch, the rfm and atmega328 are soldered to a custom made pcb (ordered from china). sometimes when it refuses to connect for a long time I re-heat a random rfm95 pin and it inits OK, sometimes I just touch it and it comes back to life (sometimes it doesnt). sometimes it takes 4-5 times of failed attempts and only then it inits OK.
I checked with an multimeter and there is definitely a good connection with the pcb and atmega.
any suggestions would be great, thanks.
// LoRa 9x_TX
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messaging client (transmitter)
// with the RH_RF95 class. RH_RF95 class does not provide for addressing or
// reliability, so you should only use RH_RF95 if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example LoRa9x_RX
#include <SPI.h>
#include <RH_RF95.h>
#define RFM95_CS 10
#define RFM95_RST 9
#define RFM95_INT 2
// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 434.0
// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);
void setup()
{
pinMode(RFM95_RST, OUTPUT);
digitalWrite(RFM95_RST, HIGH);
while (!Serial);
Serial.begin(19200);
delay(100);
Serial.println("Arduino LoRa TX Test!");
// manual reset
digitalWrite(RFM95_RST, LOW);
delay(20);
digitalWrite(RFM95_RST, HIGH);
delay(20);
while (!rf95.init()) {
Serial.println("LoRas radio init failed");
delay (100);
digitalWrite(RFM95_RST, LOW);
delay(20);
digitalWrite(RFM95_RST, HIGH);
delay(20);
}
Serial.println("LoRa radio init OK!");
rf95.setModemConfig(3);
rf95.setPreambleLength(8);
// Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
if (!rf95.setFrequency(RF95_FREQ)) {
Serial.println("setFrequency failed");
while (1);
}
Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
rf95.setModemConfig(3);
// Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
// The default transmitter power is 13dBm, using PA_BOOST.
// If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
// you can set transmitter powers from 5 to 23 dBm:
rf95.setTxPower((int16_t)16);
}
int16_t packetnum = 0; // packet counter, we increment per xmission
void loop()
{
rf95.printRegisters();
Serial.println("Sending to rf95_server");
// Send a message to rf95_server
char radiopacket[20] = "Hello World # ";
itoa(packetnum++, radiopacket+13, 10);
Serial.print("Sending "); Serial.println(radiopacket);
radiopacket[19] = 0;
Serial.println("Sending..."); delay(10);
rf95.send((uint8_t *)radiopacket, 20);
rf95.printRegisters();
Serial.println("Waiting for packet to complete..."); delay(10);
rf95.waitPacketSent();
// Now wait for a reply
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
uint8_t len = sizeof(buf);
Serial.println("Waiting for reply..."); delay(10);
if (rf95.waitAvailableTimeout(1000))
{
// Should be a reply message for us now
if (rf95.recv(buf, &len))
{
Serial.print("Got reply: ");
Serial.println((char*)buf);
Serial.print("RSSI: ");
Serial.println(rf95.lastRssi(), DEC);
}
else
{
Serial.println("Receive failed");
}
}
else
{
Serial.println("No reply, is there a listener around?");
}
delay(1000);
}