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Connor
2019-06-28 20:48:10 +10:00
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README.md
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RPI_SGP30
SGP30
=========
Library to read |eCO_2| and TVOC from the `SGP30 sensor <https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9_Gas_Sensors/Sensirion_Gas_Sensors_SGP30_Datasheet_EN.pdf>`_. Based on the smbus2 i2c library for ease of use.
Library to read eCO2 and TVOC from the [SGP30 sensor](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9_Gas_Sensors/Sensirion_Gas_Sensors_SGP30_Datasheet_EN.pdf). Based on the _smbus2_ i2c library for ease of use.
It should be compatible with both python 2 and 3 but is currently only tested under Python 2.7
It should be compatible with both Python 2 and 3
Quick usage-example:
--------------------
::
from smbus2 import SMBusWrapper
from sgp30 import Sgp30
from sgp30 import SGP30
import time
with SMBusWrapper(1) as bus:
sgp=Sgp30(bus,baseline_filename="/tmp/mySGP30_baseline") #things thing with the baselinefile is dumb and will be changed in the future
sgp = SGP30(bus, baseline_filename=BASELINE_FILENAME+".TESTING")
print("resetting all i2c devices")
sgp.i2c_geral_call() #WARNING: Will reset any device on teh i2cbus that listens for general call
sgp.i2c_general_call()
print(sgp.read_features())
print(sgp.read_serial())
sgp.init_sgp()
print(sgp.read_measurements())
print("the SGP30 takes at least 15 seconds to warm up, 12 hours before the readigs become really stable"
for i in range(20):
time.sleep(1)
print(".",end="")
print()
print(sgp.read_measurements())
for i in range(300):
print(sgp.read_measurements())
time.sleep(0.1)
sgp.store_baseline()
bus.close()
Current design considerations:
------------------------------
@@ -41,9 +39,8 @@ Features that are known to be missing (listing in rough order of importance):
Hardware notices:
-----------------
If you have the Adafruit board with built in level shifters and voltage regulator it is should work if you just plug in `SDA to pin 3, SCL to pin 5, VCC to pin 17 and GND to pin 20 <https://pinout.xyz/pinout/i2c>`_. You should then be able to find the SGP30 an address 0x58 using `i2cdetect -y 1`. If you get an error message you probably need to enable i2c in the kernel using `raspi-config and reboot <https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial>`_
If you have the Adafruit board with built in level shifters and voltage regulator it is should work if you just plug in [SDA to pin 3, SCL to pin 5, VCC to pin 17 and GND to pin 20](https://pinout.xyz/pinout/i2c). You should then be able to find the SGP30 an address 0x58 using `i2cdetect -y 1`. If you get an error message you probably need to enable i2c in the kernel using [raspi-config and reboot](https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial>)
Feel free to contact me with bugs, questions or issues.
.. |eCO_2| replace:: eCO\ :sub:`2`