💬 Atmospheric Pressure Sensor
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Hi, i've a problem with the bmp180 with domoticz. I use raspberry pi with domoticz and mysensor v2 and nrf24 on gpio, i receive data but i think is wrong. The temperature is 31°C and pressure is 728. I put my altitude in the sketch.
Can you help me?
Best regards.Welcome to the MySensors community @James-Flosse !
Could you post your sketch and debug output from the node and the gateway?
If you haven't looked at it already, https://www.mysensors.org/build/debug#enabling-debug-logging has information on how to enable debug logging.
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Hi @mfalkvidd. This is the debug output and my code
2269 MCO:REG:REQ 2277 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2 2287 TSF:MSG:READ,0-0-3,s=255,c=3,t=27,pt=1,l=1,sg=0:1 2293 MCO:PIM:NODE REG=1 2295 MCO:BGN:STP 2306 MCO:BGN:INIT OK,TSP=1 Forecast at minute 1 dP/dt = 0.00kPa/h --> unknown Temperature = 31.00 *C Pressure = 728.00 hPa Forecast = unknown 2359 TSF:MSG:SEND,3-3-0-0,s=1,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:31.0 2369 TSF:MSG:SEND,3-3-0-0,s=0,c=1,t=4,pt=7,l=5,sg=0,ft=0,st=OK:728 2381 TSF:MSG:SEND,3-3-0-0,s=0,c=1,t=5,pt=0,l=7,sg=0,ft=0,st=OK:unknown 2387 MCO:SLP:MS=60000,SMS=0,I1=255,M1=255,I2=255,M2=255 2394 MCO:SLP:TPD// Enable debug prints to serial monitor #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #include <SPI.h> #include <MySensors.h> #include <Wire.h> #include <Adafruit_BMP085.h> #define BARO_CHILD 0 #define TEMP_CHILD 1 const float ALTITUDE = 688; // <-- adapt this value to your own location's altitude. // Sleep time between reads (in seconds). Do not change this value as the forecast algorithm needs a sample every minute. const unsigned long SLEEP_TIME = 60000; const char *weather[] = { "stable", "sunny", "cloudy", "unstable", "thunderstorm", "unknown" }; enum FORECAST { STABLE = 0, // "Stable Weather Pattern" SUNNY = 1, // "Slowly rising Good Weather", "Clear/Sunny " CLOUDY = 2, // "Slowly falling L-Pressure ", "Cloudy/Rain " UNSTABLE = 3, // "Quickly rising H-Press", "Not Stable" THUNDERSTORM = 4, // "Quickly falling L-Press", "Thunderstorm" UNKNOWN = 5 // "Unknown (More Time needed) }; Adafruit_BMP085 bmp = Adafruit_BMP085(); // Digital Pressure Sensor float lastPressure = -1; float lastTemp = -1; int lastForecast = -1; const int LAST_SAMPLES_COUNT = 5; float lastPressureSamples[LAST_SAMPLES_COUNT]; // this CONVERSION_FACTOR is used to convert from Pa to kPa in forecast algorithm // get kPa/h be dividing hPa by 10 #define CONVERSION_FACTOR (1.0/10.0) int minuteCount = 0; bool firstRound = true; // average value is used in forecast algorithm. float pressureAvg; // average after 2 hours is used as reference value for the next iteration. float pressureAvg2; float dP_dt; bool metric; MyMessage tempMsg(TEMP_CHILD, V_TEMP); MyMessage pressureMsg(BARO_CHILD, V_PRESSURE); MyMessage forecastMsg(BARO_CHILD, V_FORECAST); void setup() { if (!bmp.begin()) { Serial.println("Could not find a valid BMP085 sensor, check wiring!"); while (1) {} } metric = getControllerConfig().isMetric; } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("Pressure Sensor", "1.1"); // Register sensors to gw (they will be created as child devices) present(BARO_CHILD, S_BARO); present(TEMP_CHILD, S_TEMP); } void loop() { float pressure = bmp.readPressure() / 100 ; float temperature = bmp.readTemperature(); if (!metric) { // Convert to fahrenheit temperature = temperature * 9.0 / 5.0 + 32.0; } int forecast = sample(pressure); Serial.print("Temperature = "); Serial.print(temperature); Serial.println(metric ? " *C" : " *F"); Serial.print("Pressure = "); Serial.print(pressure); Serial.println(" hPa"); Serial.print("Forecast = "); Serial.println(weather[forecast]); if (temperature != lastTemp) { send(tempMsg.set(temperature, 1)); lastTemp = temperature; } if (pressure != lastPressure) { send(pressureMsg.set(pressure, 0)); lastPressure = pressure; } if (forecast != lastForecast) { send(forecastMsg.set(weather[forecast])); lastForecast = forecast; } sleep(SLEEP_TIME); } float getLastPressureSamplesAverage() { float lastPressureSamplesAverage = 0; for (int i = 0; i < LAST_SAMPLES_COUNT; i++) { lastPressureSamplesAverage += lastPressureSamples[i]; } lastPressureSamplesAverage /= LAST_SAMPLES_COUNT; return lastPressureSamplesAverage; } // Algorithm found here // http://www.freescale.com/files/sensors/doc/app_note/AN3914.pdf // Pressure in hPa --> forecast done by calculating kPa/h int sample(float pressure) { // Calculate the average of the last n minutes. int index = minuteCount % LAST_SAMPLES_COUNT; lastPressureSamples[index] = pressure; minuteCount++; if (minuteCount > 185) { minuteCount = 6; } if (minuteCount == 5) { pressureAvg = getLastPressureSamplesAverage(); } else if (minuteCount == 35) { float lastPressureAvg = getLastPressureSamplesAverage(); float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) // first time initial 3 hour { dP_dt = change * 2; // note this is for t = 0.5hour } else { dP_dt = change / 1.5; // divide by 1.5 as this is the difference in time from 0 value. } } else if (minuteCount == 65) { float lastPressureAvg = getLastPressureSamplesAverage(); float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) //first time initial 3 hour { dP_dt = change; //note this is for t = 1 hour } else { dP_dt = change / 2; //divide by 2 as this is the difference in time from 0 value } } else if (minuteCount == 95) { float lastPressureAvg = getLastPressureSamplesAverage(); float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) // first time initial 3 hour { dP_dt = change / 1.5; // note this is for t = 1.5 hour } else { dP_dt = change / 2.5; // divide by 2.5 as this is the difference in time from 0 value } } else if (minuteCount == 125) { float lastPressureAvg = getLastPressureSamplesAverage(); pressureAvg2 = lastPressureAvg; // store for later use. float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) // first time initial 3 hour { dP_dt = change / 2; // note this is for t = 2 hour } else { dP_dt = change / 3; // divide by 3 as this is the difference in time from 0 value } } else if (minuteCount == 155) { float lastPressureAvg = getLastPressureSamplesAverage(); float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) // first time initial 3 hour { dP_dt = change / 2.5; // note this is for t = 2.5 hour } else { dP_dt = change / 3.5; // divide by 3.5 as this is the difference in time from 0 value } } else if (minuteCount == 185) { float lastPressureAvg = getLastPressureSamplesAverage(); float change = (lastPressureAvg - pressureAvg) * CONVERSION_FACTOR; if (firstRound) // first time initial 3 hour { dP_dt = change / 3; // note this is for t = 3 hour } else { dP_dt = change / 4; // divide by 4 as this is the difference in time from 0 value } pressureAvg = pressureAvg2; // Equating the pressure at 0 to the pressure at 2 hour after 3 hours have past. firstRound = false; // flag to let you know that this is on the past 3 hour mark. Initialized to 0 outside main loop. } int forecast = UNKNOWN; if (minuteCount < 35 && firstRound) //if time is less than 35 min on the first 3 hour interval. { forecast = UNKNOWN; } else if (dP_dt < (-0.25)) { forecast = THUNDERSTORM; } else if (dP_dt > 0.25) { forecast = UNSTABLE; } else if ((dP_dt > (-0.25)) && (dP_dt < (-0.05))) { forecast = CLOUDY; } else if ((dP_dt > 0.05) && (dP_dt < 0.25)) { forecast = SUNNY; } else if ((dP_dt >(-0.05)) && (dP_dt < 0.05)) { forecast = STABLE; } else { forecast = UNKNOWN; } // uncomment when debugging Serial.print(F("Forecast at minute ")); Serial.print(minuteCount); Serial.print(F(" dP/dt = ")); Serial.print(dP_dt); Serial.print(F("kPa/h --> ")); Serial.println(weather[forecast]); return forecast; }2017-03-09 10:52:56.474 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:52:56.475 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:52:56.488 (GATEWAY) Temp (Temp) 2017-03-09 10:52:56.497 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:52:56.503 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:53:40.053 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:53:40.054 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:53:40.067 (GATEWAY) Temp (Temp) 2017-03-09 10:53:40.075 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:53:40.081 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:14.102 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:54:14.104 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:54:14.148 (GATEWAY) Temp (Temp) 2017-03-09 10:54:14.162 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:14.172 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:26.662 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:54:26.664 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:54:26.676 (GATEWAY) Temp (Temp) 2017-03-09 10:54:26.685 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:26.691 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:44.122 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:54:44.123 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:54:44.136 (GATEWAY) Temp (Temp) 2017-03-09 10:54:44.145 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:44.150 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:50.417 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 10:54:51.225 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 10:54:51.227 (GATEWAY) Temp (Temp) 2017-03-09 10:54:51.236 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:54:51.242 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:55:55.513 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:58:05.600 (GATEWAY) Temp (Temp) 2017-03-09 10:58:05.608 (GATEWAY) General/Barometer (Baro) 2017-03-09 10:59:10.651 (GATEWAY) Temp (Temp) 2017-03-09 11:01:20.704 (GATEWAY) Temp (Temp) 2017-03-09 11:02:00.701 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:02:00.702 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:02:00.715 (GATEWAY) Temp (Temp) 2017-03-09 11:02:00.723 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:00.728 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:31.650 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:02:31.652 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:02:31.664 (GATEWAY) Temp (Temp) 2017-03-09 11:02:31.673 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:31.678 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:38.872 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:02:38.873 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:02:38.886 (GATEWAY) Temp (Temp) 2017-03-09 11:02:38.894 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:38.900 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:41.863 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:02:41.864 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:02:41.887 (GATEWAY) Temp (Temp) 2017-03-09 11:02:41.895 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:41.901 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:49.208 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:02:49.209 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:02:49.232 (GATEWAY) Temp (Temp) 2017-03-09 11:02:49.240 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:02:49.245 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:03:54.286 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:04:59.319 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:06:04.359 (GATEWAY) Temp (Temp) 2017-03-09 11:06:04.368 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:06:36.109 MySensors: Node: 3, Sketch Name: Pressure Sensor 2017-03-09 11:06:36.111 MySensors: Node: 3, Sketch Version: 1.1 2017-03-09 11:06:36.123 (GATEWAY) Temp (Temp) 2017-03-09 11:06:36.132 (GATEWAY) General/Barometer (Baro) 2017-03-09 11:06:36.137 (GATEWAY) General/Barometer (Baro) -
The pressure and temperature is incorrect xD. sorry, i have 20°C in my room and the METAR of the near airport say 1016 hPa.
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The pressure and temperature is incorrect xD. sorry, i have 20°C in my room and the METAR of the near airport say 1016 hPa.
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Only bmp180 connected to arduino and i have test with 3 other :s
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Hi, i'm using this sketch and I had to modify it a little bit. But i'm at work and i haven't it.
You defined the altitude to 688 meters in you sketch, are you sure, you said you're at 1014mbars. If you're really at 700m you should be near 930mbars not 1014mbars.
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Ok i defined the altitude by my own (225 meters) but i have the same pressure and temperature :S
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#include <Wire.h> #include <Adafruit_Sensor.h> #include <Adafruit_BMP085_U.h> Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085); void setup(void) { Serial.begin(9600); Serial.println("Pressure Sensor Test"); Serial.println(""); /* Initialise the sensor */ if(!bmp.begin()) { /* There was a problem detecting the BMP085 ... check your connections */ Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!"); while(1); } } void loop(void) { /* Get a new sensor event */ sensors_event_t event; bmp.getEvent(&event); /* Display the results (barometric pressure is measure in hPa) */ if (event.pressure) { /* Display atmospheric pressure in hPa */ Serial.print("Pressure: "); Serial.print(event.pressure); Serial.println(" hPa"); } else { Serial.println("Sensor error"); } delay(250); }Pressure: 756.46 hPa Pressure: 756.47 hPa Pressure: 756.49 hPa Pressure: 756.44 hPa Pressure: 756.44 hPa Pressure: 756.46 hPa Pressure: 756.41 hPa Pressure: 756.44 hPa Pressure: 756.42 hPa Pressure: 756.39 hPa Pressure: 756.42 hPa Pressure: 756.44 hPa Pressure: 756.38 hPa Pressure: 756.40 hPa Pressure: 756.41 hPa Pressure: 756.38 hPa Pressure: 756.41 hPa Pressure: 756.40 hPa Pressure: 756.38 hPa Pressure: 756.40 hPa Pressure: 756.42 hPa Pressure: 756.34 hPa Pressure: 756.22 hPa Pressure: 756.33 hPa Pressure: 756.37 hPa Pressure: 756.38 hPasame pressure
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I bought it in banggood, but it work's before...
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I supply itwith the 3.3 V output off arduino
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i tested with 3.3V and 5volt but same result
http://www.banggood.com/fr/GY-68-BMP180-Digital-Barometric-Pressure-Sensor-Board-Module-p-1059025.html?rmmds=myorder -
Have you link for older library? Are you french?
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Yes ^^ . can you give me at snyp_thx at hotmail dot fr?
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