Commit 6939004f authored by Grace Copplestone's avatar Grace Copplestone

lora module

parent 777c491a
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<h1>Adafruit Feather M0 Radio with LoRa Radio Module 900MHz</h1>
<!--<figure>
<img src='ring.png' width=50%>
<figcaption>RF Ring oscillator with NRF24L01. Note: the cursors are measuring half a cycle.</figcaption>
</figure>-->
<p>This RF ring oscillator runs on the Adafruit Feather board incorporates a ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz with a <a href="http://www.hoperf.com/upload/rf/RFM95_96_97_98W.pdf">RFM95 Low Power Long Range Transceiver Module</a>.</p>
<p>I used <a href="https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module/using-the-rfm-9x-radio">Adafruit's documentation</a> to get the oscillator running using the Arduino IDE.</p>
<figure>
<img src='feather_lora_setup.jpg' width=40%>
<figcaption>Feather M0 LoRa setup</figcaption>
</figure>
<p>Code is included below. The oscilloscope output was generated by pulling a GPIO pin high while the radio sent a message and waited to verify delivery of the message. The round trip time was 127ms which equates to a frequency of 7.9Hz. This is pretty long in comparison to other modules that we've been testing however the real benefit of the LoRa Radio Module is it's capability over long ranges.</p>
<figure>
<img src='feather_lora_scope.png' width=60%>
<figcaption>Feather M0 LoRa ring oscillator results</figcaption>
</figure>
<p>The code below is used on both modules with two lines changed to enable the ring to start. The variable counter should be adjusted as described in the comment and the starting sequence should be uncommented, again as described in the comment in the code.</p>
<pre>
<code>
#include <SPI.h>
#include <RH_RF95.h>
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 3
// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 915.0
#define FIRE 12
// 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(9600);
delay(100);
Serial.println("Feather LoRa TX Test!");
// manual reset
digitalWrite(RFM95_RST, LOW);
delay(10);
digitalWrite(RFM95_RST, HIGH);
delay(10);
while (!rf95.init()) {
Serial.println("LoRa radio init failed");
while (1);
}
Serial.println("LoRa radio init OK!");
// 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);
// 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(23, false);
}
int counter = 1; // 1 for the starter, 0 for the follower
int message;
bool start = true;
void loop(){
// include for the starter, comment out for the follower
if(start == true){Serial.println("Starting");start = false;delay(2000);uint8_t data[] = "1";rf95.send(data, sizeof(data));rf95.waitPacketSent();}
// listen for a message, and add it to counter
if (rf95.available()){
// process the message, not sure whether the length check is necessary
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
uint8_t len = sizeof(buf);
if (rf95.recv(buf, &len)){
message = atoi((char*)buf);
char buf[20];
//Serial.print("Message = "); Serial.print(message); Serial.print(" Counter = "); Serial.println(counter);
// if the message is greater than counter, then add one and send back
if(message > counter){
counter += 2;
itoa(counter, buf, 10);
digitalWrite(FIRE,HIGH);
rf95.send((uint8_t*)buf,20);
rf95.waitPacketSent();
//delay(1);
digitalWrite(FIRE,LOW);
//Serial.print("Message = "); Serial.print(message); Serial.print(" Counter = "); Serial.println(counter);
}
}
}
}
</code>
</pre>
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\ No newline at end of file
......@@ -187,7 +187,7 @@ void setup(){
//clear all interrupts
tempval = read_register(STATUS);
write_register(STATUS,tempval | MAX_RT | RX_DR | TX_DS);
_delay_ms(1);
_delay_ms(1);2
sei();
//enter standby so we can write to configuration register.
......@@ -242,7 +242,7 @@ void read_token(){
//clear IRQ
write_register(STATUS, tempval | RX_DR);
//check_registers(66);
check_registers(66);
}
int main(void) {
......@@ -251,7 +251,7 @@ int main(void) {
if ( !(PORTC.IN & IRQ_BM)){
read_token(); //in standby
token += 1; //increment token
//check_registers(65);
check_registers(65);
send_token();
}
//we use a signal on the usart to start the oscillation.
......@@ -261,9 +261,9 @@ int main(void) {
PORTC.OUTCLR = CE_BM;
_delay_us(ce_delay_us);
send_token();
//check_registers(64);
check_registers(64);
}
//_delay_ms(10);
_delay_ms(10);
}
}
......
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