$ cat bmp280.py # Distributed with a free-will license. # Use it any way you want, profit or free, provided it fits in the licenses of its associated works. # BMP280 # This code is designed to work with the BMP280_I2CS I2C Mini Module available from ControlEverything.com. # https://www.controleverything.com/content/Barometer?sku=BMP280_I2CSs#tabs-0-product_tabset-2 import smbus import time
# Get I2C bus bus = smbus.SMBus(1)
# BMP280 address, 0x76(118) # Read data back from 0x88(136), 24 bytes b1 = bus.read_i2c_block_data(0x76, 0x88, 24)
# BMP280 address, 0x76(118) # Select Control measurement register, 0xF4(244) # 0x27(39) Pressure and Temperature Oversampling rate = 1 # Normal mode bus.write_byte_data(0x76, 0xF4, 0x27) # BMP280 address, 0x76(118) # Select Configuration register, 0xF5(245) # 0xA0(00) Stand_by time = 1000 ms bus.write_byte_data(0x76, 0xF5, 0xA0)
time.sleep(0.5)
# BMP280 address, 0x76(118) # Read data back from 0xF7(247), 8 bytes # Pressure MSB, Pressure LSB, Pressure xLSB, Temperature MSB, Temperature LSB # Temperature xLSB, Humidity MSB, Humidity LSB data = bus.read_i2c_block_data(0x76, 0xF7, 8)
# Convert pressure and temperature data to 19-bits adc_p = ((data[0] * 65536) + (data[1] * 256) + (data[2] & 0xF0)) / 16 adc_t = ((data[3] * 65536) + (data[4] * 256) + (data[5] & 0xF0)) / 16
Part No: FT2232HQ USB Hi-Speed to Dual Channel Serial UART/FIFO/JTAG/SPI/I2C IC, QFN-64 Hi-speed USB 2.0 Slave to Dual Channel UART / Serial Converter
Data Rates: 12Mbaud (UART) up to 40MB/s (Sync FIFO) USB Transfer Modes: Bulk Interfaces: UART, FIFO, 2 x MPSSE, Fast serial, 8051 MCU emulation, 16 GPIOs USB Host: No Packages: 64-pin QFN Channels: 2 I/O Voltage: 3.3V USB Class: Vendor Virtual Com Port: Yes Operating Temperature: -40°C to +85°C Standard Price (Easy checkout) Order Quantity Price per Unit 1 - 9 : USD5.10 10 - 49 : USD4.90 50 - 99 : USD4.80 100 - 249 : USD4.70 250 - 499 : USD4.50 500 - 999 : USD4.25
Key Hardware Features Single chip USB to dual serial / parallel ports with a variety of configurations. Entire USB protocol handled on the chip. No USB specific firmware programming required. USB 2.0 High Speed (480Mbits/second) and Full Speed (12Mbits/second) compatible. Dual Multi-Protocol Synchronous Serial Engine (MPSSE) to simplify synchronous serial protocol (USB to JTAG, I2C, SPI or bit-bang) design. Dual independent UART or FIFO ports configurable using MPSSEs. Independent Baud rate generators. RS232/RS422/RS485 UART Transfer Data Rate up to 12Mbaud. (RS232 Data Rate limited by external level shifter). USB to parallel FIFO transfer data rate up to 10Mbyte/sec. Single channel synchronous FIFO mode for transfers up to 40 Mbytes/sec. CPU-style FIFO interface mode simplifies CPU interface design. MCU host bus emulation mode configuration option. Fast Opto-Isolated serial interface option. FTDI’s royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases. Adjustable receive buffer timeout. Option for transmit and receive LED drive signals on each channel. Enhanced bit-bang Mode interface option with RD# and WR# strobes. FT245B-style FIFO interface option with bidirectional data bus and simple 4 wire handshake interface. Highly integrated design includes +1.8V LDO regulator for VCORE, integrated POR function and on chip clock multiplier PLL (12MHz – 480MHz). Asynchronous serial UART interface option with full hardware handshaking and modem interface signals. Fully assisted hardware or X-On / X-Off software handshaking. UART Interface supports 7/8 bit data, 1/2 stop bits, and Odd/Even/Mark/Space/No Parity. Auto-transmit enable control for RS485 serial applications using TXDEN pin. Operational configuration mode and USB Description strings configurable in external EEPROM over the USB interface. Configurable I/O drive strength (4,8,12 or 16mA) and slew rate. Low operating and USB suspend current. Supports bus powered, self powered and high-power bus powered USB configurations. UHCI/OHCI/EHCI host controller compatible. USB Bulk data transfer mode (512 byte packets in Hi-Speed mode). +1.8V (chip core) and +3.3V I/O interfacing (+5V Tolerant). Extended -40°C to 85°C industrial operating temperature range. Compact 64-LD Lead Free LQFP/LQFN package and 56-LD VQFN packages. +3.3V single supply operating voltage range.
