Example sketch for PWF Lightning Sensor

Author: sparkman1

libraries/MySensors/examples/LightningSensor/LightningSensor.ino

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+// This sketch is to integrate the Playing With Fusion AXS3935 Lightning Sensor Breakout Board
+// with the MySensors environment and is based on a sketch provided by Playing With Fusion
+// http://playingwithfusion.com/productview.php?pdid=22&catid=1001
+//
+#include "MySensor.h"  
+// the lightning sensor can communicate via SPI or I2C. This sketch uses the SPI interface
+#include "SPI.h"
+// include Playing With Fusion AXS3935 libraries
+#include "PWFusion_AS3935.h"
+
+// setup CS pins used for the connection with the lightning sensor
+// other connections are controlled by the SPI library)
+int8_t CS_PIN  = 8;
+int8_t SI_PIN  = 7;
+int8_t IRQ_PIN = 3;                      
+volatile int8_t AS3935_ISR_Trig = 0;
+
+// #defines
+#define AS3935_INDOORS       1
+#define AS3935_OUTDOORS      0
+#define AS3935_DIST_DIS      0
+#define AS3935_DIST_EN       1
+#define AS3935_CAPACITANCE   96      // <-- SET THIS VALUE TO THE NUMBER LISTED ON YOUR BOARD 
+// prototypes
+void AS3935_ISR();
+
+PWF_AS3935  lightning0(CS_PIN, IRQ_PIN, SI_PIN);
+
+#define CHILD_ID_DISTANCE 1
+#define CHILD_ID_INTENSITY 2
+MySensor gw;
+MyMessage msgDist(CHILD_ID_DISTANCE, V_DISTANCE);
+MyMessage msgInt(CHILD_ID_INTENSITY, V_VAR1);
+
+void setup()  
+{ 
+  gw.begin();
+
+  // Send the sketch version information to the gateway and Controller
+  gw.sendSketchInfo("Lightning Sensor", "1.1");
+
+  // Register all sensors to gw (they will be created as child devices)
+  gw.present(CHILD_ID_DISTANCE, S_DISTANCE);
+  gw.present(CHILD_ID_INTENSITY, S_CUSTOM);
+  boolean metric = gw.getConfig().isMetric;
+
+  Serial.begin(115200);
+  Serial.println("Playing With Fusion: AS3935 Lightning Sensor, SEN-39001");
+  Serial.println("beginning boot procedure....");
+  
+  // setup for the the SPI library:
+  SPI.begin();                            // begin SPI
+  SPI.setClockDivider(SPI_CLOCK_DIV4);    // SPI speed to SPI_CLOCK_DIV16/1MHz (max 2MHz, NEVER 500kHz!)
+  SPI.setDataMode(SPI_MODE1);             // MAX31855 is a Mode 1 device
+                                          //    --> clock starts low, read on rising edge
+  SPI.setBitOrder(MSBFIRST);              // data sent to chip MSb first 
+  
+  lightning0.AS3935_DefInit();            // set registers to default  
+  // now update sensor cal for your application and power up chip
+  lightning0.AS3935_ManualCal(AS3935_CAPACITANCE, AS3935_OUTDOORS, AS3935_DIST_EN);
+                  // AS3935_ManualCal Parameters:
+                  //   --> capacitance, in pF (marked on package)
+                  //   --> indoors/outdoors (AS3935_INDOORS:0 / AS3935_OUTDOORS:1)
+                  //   --> disturbers (AS3935_DIST_EN:1 / AS3935_DIST_DIS:2)
+                  // function also powers up the chip
+                  
+  // enable interrupt (hook IRQ pin to Arduino Uno/Mega interrupt input: 1 -> pin 3 )
+  attachInterrupt(1, AS3935_ISR, RISING);
+  // dump the registry data to the serial port for troubleshooting purposes
+  lightning0.AS3935_PrintAllRegs();
+  
+  // delay execution to allow chip to stabilize.
+  delay(1000);
+
+}
+
+void loop()      
+{     
+
+  // This program only handles an AS3935 lightning sensor. It does nothing until 
+  // an interrupt is detected on the IRQ pin.
+  while(0 == AS3935_ISR_Trig){}
+ 
+  // reset interrupt flag
+  AS3935_ISR_Trig = 0;
+  
+  // now get interrupt source
+  uint8_t int_src = lightning0.AS3935_GetInterruptSrc();
+  if(0 == int_src)
+  {
+    Serial.println("Unknown interrupt source");
+  }
+  else if(1 == int_src)
+  {
+    uint8_t lightning_dist_km = lightning0.AS3935_GetLightningDistKm();
+    uint32_t lightning_intensity = lightning0.AS3935_GetStrikeEnergyRaw();
+
+    Serial.print("Lightning detected! Distance to strike: ");
+    Serial.print(lightning_dist_km);
+    Serial.println(" kilometers");
+    Serial.print("Lightning detected! Lightning Intensity: ");
+    Serial.println(lightning_intensity);
+    gw.send(msgDist.set(lightning_dist_km));
+    gw.send(msgInt.set(lightning_intensity));
+  }
+  else if(2 == int_src)
+  {
+    Serial.println("Disturber detected");
+  }
+  else if(3 == int_src)
+  {
+    Serial.println("Noise level too high");
+  }
+}
+
+// this is irq handler for AS3935 interrupts, has to return void and take no arguments
+// always make code in interrupt handlers fast and short
+void AS3935_ISR()
+{
+  AS3935_ISR_Trig = 1;
+}

libraries/PWF_AS3935_Lightning_Sensor/PWF_Lightning_Sensor.txt

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+Notes from AS3935 datasheet:
+Register Map: Page 11, detailed version on Page 12
+
+Max clock freq for SPI = 2MHz
+
+SPI command Structure: Page14
+To activate this SPI, the CS has to be set to low. A SPI command consists of two bytes serial command and the data are sampled on the falling
+edge of SCLK (CPHA=1). The next table shows command structure, from the MSB (B15) to LSB (B0). The command stream has to be sent to
+the SPI from the MSB (B15) to the LSB (B0).
+