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Weather click

MIKROE-1978

29 g

Weather click carries BME280 integrated environmental unit from Bosch. It’s a sensor that detects humidity, pressure, and temperature, specifically designed for low current consumption and long-term stability. The click is designed to work on a 3.3V power supply. It communicates with the target microcontroller over SPI or I2C interface.

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$22.00

Quantity Unit Price
5 $20.90
20 $19.80

Weather click carries BME280 integrated environmental unit from Bosch. It’s a sensor that detects humidity, pressure, and temperature, specifically designed for low current consumption and long-term stability. The click is designed to work on a 3.3V power supply. It communicates with the target microcontroller over SPI or I2C interface.

BME280 features

The BME280 is as combined digital humidity, pressure and temperature sensor based on proven sensing principles.

The BME280 IC has high accuracy and reliability for all three sensors. The humidity sensor has a response time of just one second and it’s accurate up to ±3% RH. The pressure sensor has sensitivity error of ±0.25% which is equivalent to 1m at 400m height change). The humidity and pressure sensors can operate independently from each other. Finally, the temperature sensor has a high resolution (up to 20 bit, when IIR filter is enabled) and low noise. The chip has three operating modes: sleep, forced, and normal.

Specifications

Type Environmental combo
Applications Context awareness, home automation control, personalized weather stations, sport and fitness tools and so on
On-board modules Bosch BME280
Key Features Three sensors in one: pressure, humidity, temperature. Humidity sensor response time: 1 sec. Multiple operating modes: sleep, force, normal
Key Benefits Long term stability. Humidity and pressure sensors can operate independently. Fast response time
Interface I2C,SPI
Input Voltage 3.3V
Compatibility mikroBUS
Click board size S (28.6 x 25.4 mm)

Pinout diagram

This table shows how the pinout on RS485 2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
NC 1 AN PWM 16 NC
NC 2 RST INT 15 NC
Chip select CS 3 CS TX 14 NC
SPI clock SCK 4 SCK RX 13 NC
SPI Master Input Slave Output MISO 5 MISO SCL 12 SCL I2C Clock
SPI Master Output Slave Input MOSI 6 MOSI SDA 11 SDA I2C Data
Power supply +3.3V 7 3.3V 5V 10 NC
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
JP1, JP2, JP3 and JP5 Interface Selection Right I2C Jumpers for selection between I2C or SPI communications
JP4 ADDR Left Bit 0 I2C Address bit = 0

Programming

Code examples Weather click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the library functions for weather click, that are responsible for returning temperature and humidity.
01 /****************************************************************************************************/
02 /* Returns temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC.  */
03 /***************************************************************************************************/
04 
05 static long BME280_Compensate_T() {
06   long temp1, temp2, T;
07 
08  temp1 = ((((adc_T>>3) -((long)cal_param.dig_T1<<1))) * ((long)cal_param.dig_T2)) >> 11;
09   temp2 = (((((adc_T>>4) - ((long)cal_param.dig_T1)) * ((adc_T>>4) - ((long)cal_param.dig_T1))) >> 12) * ((long)cal_param.dig_T3)) >> 14;
10   t_fine = temp1 + temp2;
11   T = (t_fine * 5 + 128) >> 8;
12   return T;
13 }
14 
15 /************************************************************************************************************/
16 /* Returns humidity in %RH as unsigned 32 bit integer in Q22.10 format (22 integer and 10 fractional bits). */
17 /* Output value of “47445” represents 47445/1024 = 46.333 %RH */
18 /************************************************************************************************************/
19 
20 static unsigned long BME280_Compensate_H() {
21   long h1;
22   h1 = (t_fine - ((long)76800));
23   h1 = (((((adc_H << 14) - (((long)cal_param.dig_H4) << 20) - (((long)cal_param.dig_H5) * h1)) +
24     ((long)16384)) >> 15) * (((((((h1 * ((long)cal_param.dig_H6)) >> 10) * (((h1 *
25     ((long)cal_param.dig_H3)) >> 11) + ((long)32768))) >> 10) + ((long)2097152)) *
26     ((long)cal_param.dig_H2) + 8192) >> 14));
27   h1 = (h1 - (((((h1 >> 15) * (h1 >> 15)) >> 7) * ((long)cal_param.dig_H1)) >> 4));
28   h1 = (h1 < 0 ? 0 : h1);
29   h1 = (h1 > 419430400 ? 419430400 : h1);
30   return (unsigned long)(h1>>12);
31 }

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