f3c15d6a80
Able to read values but cant save callibration data and does not check CRC. Also not a library
43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
import smbus2
|
|
from smbus2 import SMBusWrapper, SMBus, i2c_msg
|
|
from collections import namedtuple
|
|
from functools import partial
|
|
#import Adafruit_PureIO.smbus as adabus
|
|
from time import sleep
|
|
|
|
DEVICE_BUS = 1
|
|
DEVICE_ADDR = 0x58
|
|
#print bus.write_byte_datadata(DEVICE_ADDR, 0x00, 0x01)
|
|
#self._i2c_read_words_from_cmd([0x36, 0x82], 0.01, 3)
|
|
|
|
Sgp30Cmd = namedtuple("Sgp30Cmd",["commands","replylen"])
|
|
GET_SERIAL=Sgp30Cmd([0x36, 0x82],6)
|
|
GET_FEATURES=Sgp30Cmd([0x20, 0x2f],2)
|
|
IAQ_INIT=Sgp30Cmd([0x20, 0x03],0)
|
|
IAQ_MEASURE=Sgp30Cmd([0x20, 0x08],6)
|
|
IAQ_SELFTEST=Sgp30Cmd([0x20, 0x32],3)
|
|
|
|
def read_write(cmd,bus,addr=DEVICE_ADDR,sleep_time=0):
|
|
bus.i2c_rdwr(i2c_msg.write(addr,cmd.commands))
|
|
if cmd.replylen >0 :
|
|
b=i2c_msg.read(addr,cmd.replylen)
|
|
sleep(sleep_time)
|
|
bus.i2c_rdwr(b)
|
|
r=list(b)
|
|
crc=r[2::3]
|
|
answer = [i<<8 | j for i,j in zip(r[0::3],r[1::3])]
|
|
return answer
|
|
|
|
with SMBusWrapper(1) as bus:
|
|
rw=partial(read_write,bus=bus)
|
|
print(rw(GET_FEATURES))
|
|
print(rw(GET_SERIAL))
|
|
print(rw(IAQ_INIT))
|
|
#print(rw(IAQ_SELFTEST,sleep_time=.1))
|
|
for i in range(600):
|
|
print( "CO_2eq: %d ppm, TVOC: %d"%tuple( rw(IAQ_MEASURE,sleep_time=.1)))
|
|
sleep(2)
|
|
|
|
|
|
bus.close()
|