X-Git-Url: https://git.rvb.name/weathermon.git/blobdiff_plain/ce99248e255a7f92c91cb166aa62830b3fd77c76..e7a2d1b901dbeb947e0ad605a53badc845e23ebc:/Weather_WH2.ino diff --git a/Weather_WH2.ino b/Weather_WH2.ino deleted file mode 100644 index a1796cc..0000000 --- a/Weather_WH2.ino +++ /dev/null @@ -1,413 +0,0 @@ -/* - Updated code for receiving data from WH2 weather station - This code implements timeouts to make decoding more robust - Decodes received packets and writes a summary of each packet to the Arduino's - serial port - Created by Luc Small on 19 July 2013. - Released into the public domain. -*/ - -#include -#include -#include - -// DHT11 and BMP085 wired sensors -dht DHT; -BMP085 bmp; - -// Humidity sensor at pin 4 -#define DHT11PIN 5 - -#define DEBUG - -// LED pins -#define REDPIN 11 -#define GREENPIN 12 - -// Read data from 433MHz receiver on digital pin 3 -#define RF_IN 4 -// For better efficiency, the port is read directly -// the following two lines should be changed appropriately -// if the line above is changed. -#define RF_IN_RAW PIND4 -#define RF_IN_PIN PIND - -// Port that is hooked to LED to indicate a packet has been received - -#define COUNTER_RATE 3200-1 // 16,000,000Hz / 3200 = 5000 interrupts per second, ie. 200us between interrupts -// 1 is indicated by 500uS pulse -// wh2_accept from 2 = 400us to 3 = 600us -#define IS_HI_PULSE(interval) (interval >= 2 && interval <= 3) -// 0 is indicated by ~1500us pulse -// wh2_accept from 7 = 1400us to 8 = 1600us -#define IS_LOW_PULSE(interval) (interval >= 7 && interval <= 8) -// worst case packet length -// 6 bytes x 8 bits x (1.5 + 1) = 120ms; 120ms = 200us x 600 -#define HAS_TIMED_OUT(interval) (interval > 600) -// we expect 1ms of idle time between pulses -// so if our pulse hasn't arrived by 1.2ms, reset the wh2_packet_state machine -// 6 x 200us = 1.2ms -#define IDLE_HAS_TIMED_OUT(interval) (interval > 6) -// our expected pulse should arrive after 1ms -// we'll wh2_accept it if it arrives after -// 4 x 200us = 800us -#define IDLE_PERIOD_DONE(interval) (interval >= 4) -// Shorthand for tests -//#define RF_HI (digitalRead(RF_IN) == HIGH) -//#define RF_LOW (digitalRead(RF_IN) == LOW) -#define RF_HI (bit_is_set(RF_IN_PIN, RF_IN_RAW)) -#define RF_LOW (bit_is_clear(RF_IN_PIN, RF_IN_RAW)) - -// wh2_flags -#define GOT_PULSE 0x01 -#define LOGIC_HI 0x02 -volatile byte wh2_flags = 0; -volatile byte wh2_packet_state = 0; -volatile int wh2_timeout = 0; -byte wh2_packet[5]; -byte wh2_calculated_crc; - - -#ifdef DEBUG -byte printed = 0; -#endif - -ISR(TIMER1_COMPA_vect) -{ - static byte sampling_state = 0; - static byte count; - static boolean was_low = false; - - switch(sampling_state) { - case 0: // waiting - wh2_packet_state = 0; - if (RF_HI) { - if (was_low) { - count = 0; - sampling_state = 1; - was_low = false; - } - } else { - was_low = true; - } - break; - case 1: // acquiring first pulse - count++; - // end of first pulse - if (RF_LOW) { - if (IS_HI_PULSE(count)) { - wh2_flags = GOT_PULSE | LOGIC_HI; - sampling_state = 2; - count = 0; - } else if (IS_LOW_PULSE(count)) { - wh2_flags = GOT_PULSE; // logic low - sampling_state = 2; - count = 0; - } else { - sampling_state = 0; - } - } - break; - case 2: // observe 1ms of idle time - count++; - if (RF_HI) { - if (IDLE_HAS_TIMED_OUT(count)) { - sampling_state = 0; - } else if (IDLE_PERIOD_DONE(count)) { - sampling_state = 1; - count = 0; - } - } - break; - } - - if (wh2_timeout > 0) { - wh2_timeout++; - if (HAS_TIMED_OUT(wh2_timeout)) { - wh2_packet_state = 0; - wh2_timeout = 0; -#ifdef DEBUG - if (printed) { - Serial1.println(); - printed=0; - } -#endif - } - } -} - -void setup() { - - Serial1.begin(57600); - Serial1.println(); - Serial1.println("STATUS:STARTING"); - - bmp.begin(); - - pinMode(REDPIN,OUTPUT); - pinMode(GREENPIN,OUTPUT); - - pinMode(RF_IN, INPUT); - digitalWrite(RF_IN,HIGH); - - TCCR1A = 0x00; - TCCR1B = 0x09; - TCCR1C = 0x00; - OCR1A = COUNTER_RATE; - TIMSK1 = 0x02; - - // enable interrupts - sei(); -} - -unsigned long previousMillis = 0; -unsigned long indoor_interval = 60000; -unsigned long outdoor_interval = 45000; -unsigned long previousIndoor = 0; -unsigned long previousOutdoor = 0; - - -void loop() { - unsigned long now; - byte i; - - now = millis(); - - if (wh2_flags) { - if (wh2_accept()) { - // calculate the CRC - wh2_calculate_crc(); - - if (wh2_valid()) { - - Serial1.println(); - Serial1.print("SENSOR:TYPE=OUTDOOR,"); - - Serial1.print("ID="); - Serial1.print(wh2_sensor_id(), HEX); - - Serial1.print(",HUMIDITY="); - Serial1.print(wh2_humidity(), DEC); - - Serial1.print(",TEMPERATURE="); - Serial1.println(format_temp(wh2_temperature())); - - previousOutdoor = now; - digitalWrite(REDPIN,HIGH); - - } else { - - Serial1.println(); - Serial1.println("ERROR:OUTDOOR"); - previousOutdoor = now; - digitalWrite(REDPIN,LOW); - - } - - } - wh2_flags = 0x00; - } - - if ((unsigned long)(now - previousMillis) >= indoor_interval) { - - previousMillis = now; - - int chk = DHT.read11(DHT11PIN); - - if (chk==0) { - - Serial1.println(); - Serial1.print("SENSOR:TYPE=INDOOR,"); - Serial1.print("HUMIDITY="); - Serial1.print(DHT.humidity); - Serial1.print(",TEMPERATURE="); - Serial1.print(DHT.temperature); - - Serial1.println(); - Serial1.print("SENSOR:TYPE=BARO,"); - Serial1.print("PRESSURE="); - Serial1.print(bmp.readPressure()); - Serial1.print(",TEMPERATURE="); - Serial1.println(bmp.readTemperature()); - - previousIndoor = now; - digitalWrite(GREENPIN,HIGH); - - } else { - - Serial1.println(); - Serial1.println("ERROR:INDOOR"); - previousIndoor = now; - digitalWrite(GREENPIN,LOW); - - } - - } - - if ((unsigned long)(now - previousIndoor) > indoor_interval*10) { - - Serial1.println(); - Serial1.println("ERROR:INDOOR TIMEOUT"); - previousIndoor = now; - digitalWrite(GREENPIN,LOW); - - } - - if ((unsigned long)(now - previousOutdoor) > outdoor_interval*10) { - - Serial1.println(); - Serial1.println("ERROR:OUTDOOR TIMEOUT"); - previousOutdoor = now; - digitalWrite(REDPIN,LOW); - - } - -} - - -// processes new pulse -boolean wh2_accept() -{ - static byte packet_no, bit_no, history; - - // reset if in initial wh2_packet_state - if(wh2_packet_state == 0) { - // should history be 0, does it matter? - history = 0xFF; - wh2_packet_state = 1; - // enable wh2_timeout - wh2_timeout = 1; - } // fall thru to wh2_packet_state one - - // acquire preamble - if (wh2_packet_state == 1) { - // shift history right and store new value - history <<= 1; - // store a 1 if required (right shift along will store a 0) - if (wh2_flags & LOGIC_HI) { - history |= 0x01; - } - // check if we have a valid start of frame - // xxxxx110 - if ((history & B00000111) == B00000110) { - // need to clear packet, and counters - packet_no = 0; - // start at 1 becuase only need to acquire 7 bits for first packet byte. - bit_no = 1; - wh2_packet[0] = wh2_packet[1] = wh2_packet[2] = wh2_packet[3] = wh2_packet[4] = 0; - // we've acquired the preamble - wh2_packet_state = 2; - } - return false; - } - // acquire packet - if (wh2_packet_state == 2) { - - wh2_packet[packet_no] <<= 1; - if (wh2_flags & LOGIC_HI) { - wh2_packet[packet_no] |= 0x01; -#ifdef DEBUG - Serial1.print('1'); - printed=1; - } else { - Serial1.print('0'); - printed=1; -#endif - } - - bit_no ++; - if(bit_no > 7) { - bit_no = 0; - packet_no ++; - } - - if (packet_no > 4) { - // start the sampling process from scratch - wh2_packet_state = 0; - // clear wh2_timeout - wh2_timeout = 0; - return true; - } - } - return false; -} - - -void wh2_calculate_crc() -{ - wh2_calculated_crc = crc8(wh2_packet, 4); -} - -bool wh2_valid() -{ - return (wh2_calculated_crc == wh2_packet[4]); -} - -int wh2_sensor_id() -{ - return (wh2_packet[0] << 4) + (wh2_packet[1] >> 4); -} - -byte wh2_humidity() -{ - return wh2_packet[3]; -} - -/* Temperature in deci-degrees. e.g. 251 = 25.1 */ -int wh2_temperature() -{ - int temperature; - temperature = ((wh2_packet[1] & B00000111) << 8) + wh2_packet[2]; - // make negative - if (wh2_packet[1] & B00001000) { - temperature = -temperature; - } - return temperature; -} - -String format_temp(int temperature) -{ - byte whole, partial; - String s; - s = String(); - if (temperature<0) { - temperature = -temperature; - s += String('-'); - } - - whole = temperature / 10; - partial = temperature - (whole*10); - - s += String(whole, DEC); - s += '.'; - s += String(partial, DEC); - - return s; - -} - -uint8_t crc8( uint8_t *addr, uint8_t len) -{ - uint8_t crc = 0; - - // Indicated changes are from reference CRC-8 function in OneWire library - while (len--) { - uint8_t inbyte = *addr++; - for (uint8_t i = 8; i; i--) { - uint8_t mix = (crc ^ inbyte) & 0x80; // changed from & 0x01 - crc <<= 1; // changed from right shift - if (mix) crc ^= 0x31;// changed from 0x8C; - inbyte <<= 1; // changed from right shift - } - } - return crc; -} - - - - - - - - -