{"id":103923,"date":"2021-05-05T10:20:32","date_gmt":"2021-05-05T10:20:32","guid":{"rendered":"https:\/\/www.snapwhole.com\/index.php\/ham-radio-digital-mode-frequencies-2\/"},"modified":"2023-01-17T01:05:10","modified_gmt":"2023-01-17T01:05:10","slug":"arduino-bmp180-reading-temperature-and-pressure","status":"publish","type":"page","link":"https:\/\/www.snapwhole.com\/index.php\/arduino-bmp180-reading-temperature-and-pressure\/","title":{"rendered":"Arduino BMP180 – I2C Temperature and Pressure Sensor Use"},"content":{"rendered":"\n

Arduino BMP180 – Reading Temperature and Pressure<\/strong><\/mark><\/p>\n\n\n\n

Return To Arduino Projects<\/a><\/d3><\/center>

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BMP180 I2C Barometric Sensor <\/figcaption><\/figure><\/div><\/div>\n\n\n\n
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The BMP180 is an I2C device, You can use this I2C scanner to verify the address of the BMP180<\/strong><\/p>\n\n\n\nScan and Identify your Arduino I2C Port Addresses<\/a><\/d3>

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System Overview<\/strong><\/p>\n\n\n\n

While building the Central Monitoring System, I chose the BMP180 because it as relatively inexpensive and to gain experience with the BMP180 and to demonstrate its use<\/p>\n\n\n\n

I wanted to use multiple Temperature\/humidity\/pressure sensors to compare results, there are cheap sensors and expensive sensor and results vary across all the sensors<\/p>\n\n\n\n

I ordered them from Aliexpress.com for less than a dollar each, and came in 5v and 3.3v versions, I ordered two of each \u2013 always great to have a spare<\/p>\n\n\n\n

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BMP 180 I2C Temperature and Humidity Sensor<\/figcaption><\/figure><\/div><\/div>\n\n\n\n
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Wiring the BMP180 5v model to an Arduino UNO via I2C<\/strong><\/p>\n\n\n\n

Transmitter Pin -> UNO Pin\n5v                 5v\nSCL                Pin 4\nSCM                Pin 5\nGnd                GND<\/pre>\n\n\n\n
Sketch to read the BMP180 Sensor and send results to the Serial Monitor<\/strong><\/p>\n\n\n\n
#define ALTITUDE 138.0 \/\/ Altitude of our Home in meters\n#include <SFE_BMP180.h>\n\nSFE_BMP180 pressure;\n\/\/ defines pins numbers for ultrasonic sensor\nconst int trigPin = 9;\nconst int echoPin = 10;\n\nint press;\/\/working values for Pressure\n\nvoid setup()\n{\nSerial.begin(9600);\n\nif (pressure.begin()) \/\/initialize BMP180 and check status\n{\nSerial.println(\"BMP180 init success\");\n}\nelse\n{\nSerial.println(\"----------------bMP180 init Failure-----------------\");\n}\nSerial.println(\"Setup Complete\");\/\/ debug  message to mark end of setup\n\n}\nvoid loop()\n{\ndelay (500);\n\/\/bMP180 Section\nchar status; \/\/status of BMP180 calls\ndouble T,P,p0,a; \/\/working variables\nstatus = pressure.startPressure(3); \/\/start pressure\nif (status == 0)\n{\nSerial.println(\"Pressure Start Failure\");\n}\nstatus = pressure.startTemperature(); \/\/startTemperature read cycle\nif (status == 0)\n{\nSerial.println(\"Temperature Start Failure\");\n}\nSerial.println();\nSerial.print(\"provided altitude: \"); \/\/print static altitude in M and F\nSerial.print(ALTITUDE,0);\nSerial.print(\" meters, \");\nSerial.print(ALTITUDE*3.28084,0);\nSerial.println(\" feet\");\ndelay(500); \/\/give time for BMP180 to get pressure\nstatus = pressure.getPressure(P,T); \/\/ get pressure with status\nif (status==0) \/\/check for sensor failure\n{\nSerial.println(\"Pressure Read Failure\");\n\/\/do not clear display on failure, leave old value\n}\nstatus = pressure.getTemperature(T); \/\/ get Temperature\nif (status==0) \/\/check for sensor failure\n{\nSerial.println(\"Temperature Read Failure\");\n\/\/do not clear displpay on failure, leave old value\n}\nSerial.println();\nSerial.print(\"absolute pressure: \");\nSerial.print(P,2);\nSerial.print(\" mb, \");\nSerial.print(P*0.0295333727,2);\nSerial.println(\" inHg\");\np0 = pressure.sealevel(P,ALTITUDE); \/\/ we're at 134 meters\nSerial.print(\"relative (sea-level) pressure: \");\nSerial.print(p0,2);\nSerial.print(\" mb, \");\nSerial.print(p0*0.0295333727,2);\nSerial.println(\" inHg\");\na = pressure.altitude(P,p0);\nSerial.print(\"computed altitude: \");\nSerial.print(a,0);\nSerial.print(\" meters, \");\nSerial.print(a*3.28084,0);\nSerial.println(\" feet\");\ndelay(3000); \/\/wait to send next update\n}<\/pre>\n\n\n\n
Arduino BMP180 – Reading Temperature and Pressure<\/strong><\/mark><\/p>\n\n\n\n
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Arduino BMP180 – Reading Temperature and Pressure Return To Arduino Projects The BMP180 is an I2C device, You can use this I2C scanner to verify the address of the BMP180 Scan and Identify your Arduino I2C Port Addresses System Overview While building the Central Monitoring System, I chose the BMP180 because it as relatively inexpensive […]<\/p>\n
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