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interfaces:bmp180 [2020/08/17 00:24]
darron created 		interfaces:bmp180 [2020/08/17 07:23] (current)
darron [Micropython]
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-====BMP180====+==== BMP180 dual-purpose sensor ==== 
 +<wrap right> 
 +{{:interfaces:esp32-bmp180.jpg?200}} 
 +</wrap> 
 + 
 +This dual-purpose sensor is used to measure temperature and barometric pressure. 
 +It operates as an I2C slave device. 
 + 
 +The actual sensor is tiny but a board is available from China with the I2C connections 
 +and power on a standard 0.1 inch header which makes it easily accessible. 
 + 
 +=== Micropython === 
 + 
 +Setup 
 +<code> 
 +sudo apt-get install picocom 
 +sudo pip3 install mpfshell 
 +</code> 
 + 
 +Detect 
 + 
 +<code> 
 +picocom -b 115200 /dev/ttyUSB0 
 +from machine import Pin, I2C 
 +i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000) 
 +i2c.scan() 
 +[119] 
 +</code> 
 + 
 +Install 
 + 
 +<code> 
 +wget https://raw.githubusercontent.com/micropython-IMU/micropython-bmp180/master/bmp180.py 
 +mpfshell --nocolor -no ttyUSB0 -c put bmp180.py 
 +Connected to esp32 
 +mpfshell --nocolor -no ttyUSB0 -c ls 
 +Connected to esp32 
 + 
 +Remote files in '/': 
 + 
 +       bmp180.py 
 +       boot.py 
 +</code> 
 + 
 +Run 
 + 
 +<code> 
 +picocom -b 115200 /dev/ttyUSB0 
 +from machine import Pin, I2C 
 +i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000) 
 +from bmp180 import BMP180 
 +bmp180 = BMP180(i2c) 
 +print (bmp180.temperature) 
 +26.95987 
 +</code> 
 + 
 +Demo (test.py) 
 + 
 +<code> 
 +''' 
 +No license. 
 +''' 
 + 
 +from machine import Pin, I2C 
 +from bmp180 import BMP180 
 + 
 +class Test(): 
 +    ''' 
 +    No comment 
 +    ''' 
 + 
 +    def __init__(self): 
 +        self.bus = I2C(scl=Pin(22), sda=Pin(21), freq=100000) 
 +        self.bmp180 = BMP180(self.bus) 
 + 
 +    def print_temp(self): 
 +        print (self.bmp180.temperature) 
 +</code> 
 + 
 +Upload 
 + 
 +<code> 
 +mpfshell --nocolor -no ttyUSB0 -c put test.py 
 +</code> 
 + 
 +Run 
 + 
 +<code> 
 +picocom -b 115200 /dev/ttyUSB0 
 +picocom v3.1 
 + 
 +port is        : /dev/ttyUSB0 
 +flowcontrol    : none 
 +baudrate is    : 115200 
 +parity is      : none 
 +databits are   : 8 
 +stopbits are   : 1 
 +escape is      : C-a 
 +local echo is  : no 
 +noinit is      : no 
 +noreset is     : no 
 +hangup is      : no 
 +nolock is      : no 
 +send_cmd is    : sz -vv 
 +receive_cmd is : rz -vv -E 
 +imap is        : 
 +omap is        : 
 +emap is        : crcrlf,delbs, 
 +logfile is     : none 
 +initstring     : none 
 +exit_after is  : not set 
 +exit is        : no 
 + 
 +Type [C-a] [C-h] to see available commands 
 +Terminal ready 
 +>>> import machine 
 +>>> machine.reset() 
 +ets Jun  8 2016 00:22:57 
 + 
 +rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) 
 +configsip: 0, SPIWP:0xee 
 +clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 
 +mode:DIO, clock div:2 
 +load:0x3fff0018,len:4 
 +load:0x3fff001c,len:5008 
 +ho 0 tail 12 room 4 
 +load:0x40078000,len:10600 
 +ho 0 tail 12 room 4 
 +load:0x40080400,len:5684 
 +entry 0x400806bc 
 +I (548) cpu_start: Pro cpu up. 
 +I (548) cpu_start: Application information: 
 +I (548) cpu_start: Compile time:     Aug 16 2020 00:54:20 
 +I (551) cpu_start: ELF file SHA256:  0000000000000000... 
 +I (557) cpu_start: ESP-IDF:          v3.3.2 
 +I (562) cpu_start: Starting app cpu, entry point is 0x40082f30 
 +I (552) cpu_start: App cpu up. 
 +I (572) heap_init: Initializing. RAM available for dynamic allocation: 
 +I (579) heap_init: At 3FFAFF10 len 000000F0 (0 KiB): DRAM 
 +I (585) heap_init: At 3FFB6388 len 00001C78 (7 KiB): DRAM 
 +I (591) heap_init: At 3FFB9A20 len 00004108 (16 KiB): DRAM 
 +I (598) heap_init: At 3FFBDB5C len 00000004 (0 KiB): DRAM 
 +I (604) heap_init: At 3FFCA9E8 len 00015618 (85 KiB): DRAM 
 +I (610) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM 
 +I (616) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM 
 +I (623) heap_init: At 4009DE28 len 000021D8 (8 KiB): IRAM 
 +I (629) cpu_start: Pro cpu start user code 
 +I (312) cpu_start: Starting scheduler on PRO CPU. 
 +I (0) cpu_start: Starting scheduler on APP CPU. 
 +MicroPython v1.12-665-g60f5b941e on 2020-08-16; ESP32 module with ESP32 
 +Type "help()" for more information. 
 +>>> from test import Test 
 +>>> x = Test() 
 +>>> x.print_temp() 
 +27.09271 
 +</code> 
 +=== Resources === 
 + 
 +[[https://docs.micropython.org/en/latest/esp32/quickref.html|ESP32 quick reference]] 
 + 
 +[[https://github.com/micropython-IMU/micropython-bmp180|BMP180 Micropython]]