diff --git a/sgptest.py b/sgptest.py
new file mode 100644
index 0000000..169a8ff
--- /dev/null
+++ b/sgptest.py
@@ -0,0 +1,42 @@
+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()