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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,151 +1,25 @@ | ||
| import smbus | ||
| import sys | ||
| import time | ||
| from ctypes import c_short | ||
| from ctypes import c_byte | ||
| from ctypes import c_ubyte | ||
| import smbus2 | ||
| import bme280 | ||
|
|
||
| if len(sys.argv) == 2: | ||
| DEVICE = int(sys.argv[1],16) | ||
| DEVICE = int(sys.argv[1], 16) | ||
| else: | ||
| print('-1 | -1') | ||
| sys.exit(1) | ||
|
|
||
| bus = smbus.SMBus(1) # Rev 2 Pi, Pi 2 & Pi 3 uses bus 1 | ||
| # Rev 1 Pi uses bus 0 | ||
|
|
||
| def getShort(data, index): | ||
| # return two bytes from data as a signed 16-bit value | ||
| return c_short((data[index+1] << 8) + data[index]).value | ||
|
|
||
| def getUShort(data, index): | ||
| # return two bytes from data as an unsigned 16-bit value | ||
| return (data[index+1] << 8) + data[index] | ||
|
|
||
| def getChar(data,index): | ||
| # return one byte from data as a signed char | ||
| result = data[index] | ||
| if result > 127: | ||
| result -= 256 | ||
| return result | ||
|
|
||
| def getUChar(data,index): | ||
| # return one byte from data as an unsigned char | ||
| result = data[index] & 0xFF | ||
| return result | ||
|
|
||
| def readBME280ID(addr=DEVICE): | ||
| # Chip ID Register Address | ||
| REG_ID = 0xD0 | ||
| (chip_id, chip_version) = bus.read_i2c_block_data(addr, REG_ID, 2) | ||
| return (chip_id, chip_version) | ||
|
|
||
| def readBME280All(addr=DEVICE): | ||
| # Register Addresses | ||
| REG_DATA = 0xF7 | ||
| REG_CONTROL = 0xF4 | ||
| REG_CONFIG = 0xF5 | ||
|
|
||
| REG_CONTROL_HUM = 0xF2 | ||
| REG_HUM_MSB = 0xFD | ||
| REG_HUM_LSB = 0xFE | ||
|
|
||
| # Oversample setting - page 27 | ||
| OVERSAMPLE_TEMP = 2 | ||
| OVERSAMPLE_PRES = 2 | ||
| MODE = 1 | ||
|
|
||
| # Oversample setting for humidity register - page 26 | ||
| OVERSAMPLE_HUM = 2 | ||
| bus.write_byte_data(addr, REG_CONTROL_HUM, OVERSAMPLE_HUM) | ||
|
|
||
| control = OVERSAMPLE_TEMP<<5 | OVERSAMPLE_PRES<<2 | MODE | ||
| bus.write_byte_data(addr, REG_CONTROL, control) | ||
|
|
||
| # Read blocks of calibration data from EEPROM | ||
| # See Page 22 data sheet | ||
| cal1 = bus.read_i2c_block_data(addr, 0x88, 24) | ||
| cal2 = bus.read_i2c_block_data(addr, 0xA1, 1) | ||
| cal3 = bus.read_i2c_block_data(addr, 0xE1, 7) | ||
|
|
||
| # Convert byte data to word values | ||
| dig_T1 = getUShort(cal1, 0) | ||
| dig_T2 = getShort(cal1, 2) | ||
| dig_T3 = getShort(cal1, 4) | ||
|
|
||
| dig_P1 = getUShort(cal1, 6) | ||
| dig_P2 = getShort(cal1, 8) | ||
| dig_P3 = getShort(cal1, 10) | ||
| dig_P4 = getShort(cal1, 12) | ||
| dig_P5 = getShort(cal1, 14) | ||
| dig_P6 = getShort(cal1, 16) | ||
| dig_P7 = getShort(cal1, 18) | ||
| dig_P8 = getShort(cal1, 20) | ||
| dig_P9 = getShort(cal1, 22) | ||
|
|
||
| dig_H1 = getUChar(cal2, 0) | ||
| dig_H2 = getShort(cal3, 0) | ||
| dig_H3 = getUChar(cal3, 2) | ||
|
|
||
| dig_H4 = getChar(cal3, 3) | ||
| dig_H4 = (dig_H4 << 24) >> 20 | ||
| dig_H4 = dig_H4 | (getChar(cal3, 4) & 0x0F) | ||
|
|
||
| dig_H5 = getChar(cal3, 5) | ||
| dig_H5 = (dig_H5 << 24) >> 20 | ||
| dig_H5 = dig_H5 | (getUChar(cal3, 4) >> 4 & 0x0F) | ||
|
|
||
| dig_H6 = getChar(cal3, 6) | ||
|
|
||
| # Wait in ms (Datasheet Appendix B: Measurement time and current calculation) | ||
| wait_time = 1.25 + (2.3 * OVERSAMPLE_TEMP) + ((2.3 * OVERSAMPLE_PRES) + 0.575) + ((2.3 * OVERSAMPLE_HUM)+0.575) | ||
| time.sleep(wait_time/1000) # Wait the required time | ||
|
|
||
| # Read temperature/pressure/humidity | ||
| data = bus.read_i2c_block_data(addr, REG_DATA, 8) | ||
| pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4) | ||
| temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4) | ||
| hum_raw = (data[6] << 8) | data[7] | ||
|
|
||
| #Refine temperature | ||
| var1 = ((((temp_raw>>3)-(dig_T1<<1)))*(dig_T2)) >> 11 | ||
| var2 = (((((temp_raw>>4) - (dig_T1)) * ((temp_raw>>4) - (dig_T1))) >> 12) * (dig_T3)) >> 14 | ||
| t_fine = var1+var2 | ||
| temperature = float(((t_fine * 5) + 128) >> 8); | ||
|
|
||
| # Refine pressure and adjust for temperature | ||
| var1 = t_fine / 2.0 - 64000.0 | ||
| var2 = var1 * var1 * dig_P6 / 32768.0 | ||
| var2 = var2 + var1 * dig_P5 * 2.0 | ||
| var2 = var2 / 4.0 + dig_P4 * 65536.0 | ||
| var1 = (dig_P3 * var1 * var1 / 524288.0 + dig_P2 * var1) / 524288.0 | ||
| var1 = (1.0 + var1 / 32768.0) * dig_P1 | ||
| if var1 == 0: | ||
| pressure=0 | ||
| else: | ||
| pressure = 1048576.0 - pres_raw | ||
| pressure = ((pressure - var2 / 4096.0) * 6250.0) / var1 | ||
| var1 = dig_P9 * pressure * pressure / 2147483648.0 | ||
| var2 = pressure * dig_P8 / 32768.0 | ||
| pressure = pressure + (var1 + var2 + dig_P7) / 16.0 | ||
|
|
||
| # Refine humidity | ||
| humidity = t_fine - 76800.0 | ||
| humidity = (hum_raw - (dig_H4 * 64.0 + dig_H5 / 16384.0 * humidity)) * (dig_H2 / 65536.0 * (1.0 + dig_H6 / 67108864.0 * humidity * (1.0 + dig_H3 / 67108864.0 * humidity))) | ||
| humidity = humidity * (1.0 - dig_H1 * humidity / 524288.0) | ||
| if humidity > 100: | ||
| humidity = 100 | ||
| elif humidity < 0: | ||
| humidity = 0 | ||
|
|
||
| return temperature/100.0,pressure/100.0,humidity | ||
| # Rev 2 Pi, Pi 2 & Pi 3 & Pi 4 use bus 1 | ||
| # Rev 1 Pi uses bus 0 | ||
| bus = smbus2.SMBus(1) | ||
|
|
||
| def main(): | ||
| try: | ||
| temperature,pressure,humidity = readBME280All() | ||
| print('{0:0.1f} | {1:0.1f}'.format(temperature, humidity)) | ||
| calibration_params = bme280.load_calibration_params(bus, DEVICE) | ||
| data = bme280.sample(bus, DEVICE, calibration_params) | ||
|
|
||
| print('{0:0.1f} | {1:0.1f}'.format(data.temperature, data.humidity)) | ||
| except: | ||
| print('-1 | -1') | ||
|
|
||
| if __name__=="__main__": | ||
| if __name__== "__main__": | ||
| main() |
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