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Arduino BMP280 sensor how to

 

About BMP280 - temperature and pressure sensor


Bosch BME280 it's a digital sensor for temperature and pressure. Main measurement characteristics:
- ambient range for operation -40 ~ +85C, 0%-100% r.H., 300-1100hPa
- absolute temperature (0-65C) accuracy +-1C
- absolute/relative pressure accuracy +-0.6hPa/+-0.12hPa
More info on: BMP280 datasheet

HINT: Do not be confused! BMP280 sensor (temperature+pressure - no humidity!) and BMP280 sensor (temperature+pressure+humidity) seems to be similar, but: the first one is a little bit smaller and on s-Sense PCB bottom you will find the sensor type marking.


In June 2019 we've realeased 6 new environmental and air quality sensors, including Bosch Sensortec BME280, all being part of the s-Sense I2C sensor breakout family.

s-Sense BME280 sensor breakout by itbrainpower.net

BMP280 sensor breakout - topBMP280 sensor breakout - bottom

PN: SS-BMP280#I2C   SKU: ITBP-6001   BMP280 I2C sensor breakout info

Next, let's kickstart with BMP280 sensor I2C breakout - around 10-15 minutes.

 

 

 

Arduino BMP280 sensor hardware integration (wiring)


First, identify if your Arduino it's 5V or 3.3V compliant!

The BMP280 I2C sensor breakout it's shipped in default auto 3-5V compliant configuration. In a nut shell, wire as bellow:

BMP280 breakout Arduino 5V [Eg.: UNO] Arduino 3.3V [Eg.: Zero]
Vin PAD 5V 3.3V
Vdd PAD (3V3) do not connect do not connect
SDA PAD SDA SDA
SCL PAD SCL SCL
GND PAD GND GND
 

HINT, for some ARDUINO boards:
*         SDA (Serial Data)      --> A4 on Uno/Pro-Mini, 20 on Mega2560/Due, 2 Leonardo/Pro-Micro
*         SCK (Serial Clock)     --> A5 on Uno/Pro-Mini, 21 on Mega2560/Due, 3 Leonardo/Pro-Micro

Bellow, sensor wiring example with xyz-mIoT shield [AT SAMD21G, 3.3V compliant, with or without modems]:
BMP280 sensor breakout Arduino shield wiring


Arduino BMP280 sensor software


a. download BME280/BMP280 Arduino library from: here.

b. unzip the library and install in Arduino libraries folder. Restart Arduino.

c. Make a folder named "ssense_BMx280_example".
Copy the code bellow, paste it one new file and save the file as "ssense_BMx280_example.ino" in the folder created in previously or, you may download it from here (right click & save as): BME280 / BMP280 - read sensor data Arduino code

1/* s-Sense BME280 I2C / s-Sense BMP280 I2C sensor breakout example - v1.0/20190524. 
2 * 
3 * Compatible with:
4 *    s-Sense BME280 I2C sensor breakout - temperature, humidity and pressure - [PN: SS-BME280#I2C, SKU: ITBP-6002], info https://itbrainpower.net/sensors/BME280-TEMPERATURE-HUMIDITY-PRESSURE-I2C-sensor-breakout 
5 *    s-Sense BMP280 I2C sensor breakout - temperature and pressure - [PN: SS-BMP280#I2C, SKU: ITBP-6001], info https://itbrainpower.net/sensors/BMP280-TEMPERATURE-HUMIDITY-I2C-sensor-breakout
6 *
7 * This code shows how to use predefined recommended settings from Bosch for the BME280/BMP280 environmental sensor. Read temperature,  
8 * humidity (unavailable for BMP280) and pressure (pulling at 1sec) - code based on BME280-2.3.0 library originally written by Tyler Glenn 
9 * and forked by Alex Shavlovsky. Some part of code was written by Brian McNoldy. 
10 * Amazing work folks! 
11 * 
12 * We've just select the relevant functions, add some variables, functions and fuctionalities.
13 * 
14 * 
15 * Mandatory wiring:
16 *    Common for 3.3V and 5V Arduino boards:
17 *        sensor I2C SDA  <------> Arduino I2C SDA
18 *        sensor I2C SCL  <------> Arduino I2C SCL
19 *        sensor GND      <------> Arduino GND
20 *    For Arduino 3.3V compatible:
21 *        sensor Vin      <------> Arduino 3.3V
22 *    For Arduino 5V compatible:
23 *        sensor Vin      <------> Arduino 5V
24 * 
25 * Leave other sensor PADS not connected.
26 * 
27 * SPECIAL note for some ARDUINO boards:
28 *        SDA (Serial Data)   ->  A4 on Uno/Pro-Mini, 20 on Mega2560/Due, 2 Leonardo/Pro-Micro
29 *        SCK (Serial Clock)  ->  A5 on Uno/Pro-Mini, 21 on Mega2560/Due, 3 Leonardo/Pro-Micro
30 * 
31 * WIRING WARNING: wrong wiring may damage your Arduino board MCU or your sensor! Double check what you've done.
32 * 
33 * READ BME280 documentation! https://itbrainpower.net/sensors/BME280-TEMPERATURE-HUMIDITY-PRESSURE-I2C-sensor-breakout
34 * READ BMP280 documentation! https://itbrainpower.net/sensors/BMP280-TEMPERATURE-PRESSURE-I2C-sensor-breakout
35 * 
36 * We ask you to use this SOFTWARE only in conjunction with s-Sense BME280 I2C or s-Sense BMP280 I2C sensor breakout usage. Modifications, derivates 
37 * and redistribution of this SOFTWARE must include unmodified this notice. You can redistribute this SOFTWARE and/or modify it under the 
38 * terms of this notice. 
39 * 
40 * This SOFTWARE is distributed is provide "AS IS" in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 
41 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
42 *  
43 * itbrainpower.net invests significant time and resources providing those how to and in design phase of our IoT products.
44 * Support us by purchasing our environmental and air quality sensors from https://itbrainpower.net/order#s-Sense
45 *
46 *
47 * Dragos Iosub, Bucharest 2019.
48 * https://itbrainpower.net
49 */
50
51#define SERIAL_SPEED  19200
52
53#include <sSense-BMx280I2C.h>
54#include <Wire.h> 
55
56
57/* Recommended Modes -
58   Based on Bosch BME280I2C environmental sensor data sheet.
59
60Weather Monitoring :
61   forced mode, 1 sample/minute
62   pressure ×1, temperature ×1, humidity ×1, filter off
63   Current Consumption =  0.16 μA
64   RMS Noise = 3.3 Pa/30 cm, 0.07 %RH
65   Data Output Rate 1/60 Hz
66
67Humidity Sensing :
68   forced mode, 1 sample/second
69   pressure ×0, temperature ×1, humidity ×1, filter off
70   Current Consumption = 2.9 μA
71   RMS Noise = 0.07 %RH
72   Data Output Rate =  1 Hz
73
74Indoor Navigation :
75   normal mode, standby time = 0.5ms
76   pressure ×16, temperature ×2, humidity ×1, filter = x16
77   Current Consumption = 633 μA
78   RMS Noise = 0.2 Pa/1.7 cm
79   Data Output Rate = 25Hz
80   Filter Bandwidth = 0.53 Hz
81   Response Time (75%) = 0.9 s
82
83
84Gaming :
85   normal mode, standby time = 0.5ms
86   pressure ×4, temperature ×1, humidity ×0, filter = x16
87   Current Consumption = 581 μA
88   RMS Noise = 0.3 Pa/2.5 cm
89   Data Output Rate = 83 Hz
90   Filter Bandwidth = 1.75 Hz
91   Response Time (75%) = 0.3 s
92
93*/
94
95BMx280I2C::Settings settings(
96   BME280::OSR_X1,
97   BME280::OSR_X1,
98   BME280::OSR_X1,
99   BME280::Mode_Forced,
100   BME280::StandbyTime_1000ms,
101   BME280::Filter_Off,
102   BME280::SpiEnable_False,
103   0x76 // I2C address. I2C specific.
104);
105
106BMx280I2C ssenseBMx280(settings);
107
108//////////////////////////////////////////////////////////////////
109void setup()
110{
111  delay(5000);
112  DebugPort.begin(SERIAL_SPEED);
113
114  while(!DebugPort) {} // Wait
115
116  DebugPort.println("s-Sense BME/BMP280 I2C sensor.");
117
118  Wire.begin();
119  while(!ssenseBMx280.begin())
120  {
121    DebugPort.println("Could not find BME/BMP280 sensor!");
122    delay(1000);
123  }
124  
125  switch(ssenseBMx280.chipModel())
126  {
127     case BME280::ChipModel_BME280:
128       DebugPort.println("Found BME280 sensor! Humidity available.");
129       break;
130     case BME280::ChipModel_BMP280:
131       DebugPort.println("Found BMP280 sensor! No Humidity available.");
132       break;
133     default:
134       DebugPort.println("Found UNKNOWN sensor! Error!");
135  }
136
137   // Change some settings before using.
138   settings.tempOSR = BME280::OSR_X4;
139
140   ssenseBMx280.setSettings(settings);
141}
142
143//////////////////////////////////////////////////////////////////
144void loop()
145{
146   printBMx280Data(&DebugPort);
147   delay(500);
148}
149
150//////////////////////////////////////////////////////////////////
151void printBMx280Data
152(
153   Stream* client
154)
155{
156   float temp(NAN), hum(NAN), pres(NAN);
157
158   BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
159   BME280::PresUnit presUnit(BME280::PresUnit_Pa);
160
161   ssenseBMx280.read(pres, temp, hum, tempUnit, presUnit);
162
163   client->print("Temp: ");
164   client->print(temp);
165   //client->print("°"+ String(tempUnit == BME280::TempUnit_Celsius ? 'C' :'F'));
166   client->print(" "+ String(tempUnit == BME280::TempUnit_Celsius ? 'C' :'F'));
167   client->print("\t\tHumidity: ");
168   client->print(hum);
169   client->print("% RH");
170   client->print("\t\tPressure: ");
171   client->print(pres);
172   client->println(" Pa");
173
174   delay(1000);
175}
176


c'. The very same code it's available in Arduino "File-> Examples", under "ssense-BMx280" library.

d. Compile and upload the code to your Arduino shield. The sensor data may be seen on Arduino Serial Monitor (set to 19200bps).

HINT: the above code it's common for BME280 and BMP280 sensors. For BMP280, the humidity will be reported as unavailable - this is normal (BMP280 it's temperature+pressure sensor)!


What to do next:
- you may like to run the "ssense_BMx280_Environment_Calculations.ino" example - available in Arduino "File-> Examples", under "ssense-BMx280" library.


TUTORIAL PROVIDED WITHOUT ANY WARRANTY!!! USE IT AT YOUR OWN RISK!!!!

 

 

 

 

 

 

Original how to written by Dragos Iosub & itbrainpower.net team

 

 

 

 

document version 1.031 / 2020-04-08 © R&D Software Solutions srl