added logic to identify if datastore exists before running

Drybox 2.0/boot.py

@@ -0,0 +1,2 @@
+speed = str(round(machine.freq()/1000000,1))
+print("The starting speed is",speed,"MHz")

Drybox 2.0/dht.py

@@ -2,8 +2,8 @@ import array
 import micropython
 import utime
 from machine import Pin
-from micropython import const
- 
+from micropython import const 
+
 class InvalidChecksum(Exception):
     pass
  

Drybox 2.0/main.py

@@ -0,0 +1,35 @@
+from machine import Pin, I2C
+import utime as time
+from dht import DHT11, InvalidChecksum
+import gc
+
+gc.enable()
+
+#Initilialize data store
+try:
+    f = open("data.csv","r")
+    f.close()
+    print("Found Datastore...")
+except OSError:  # open failed
+    print("Creating Datastore...")
+    f = open("data.csv","w")
+    f.write("id,temp,hum\n")
+    f.close()
+    print("Done")
+
+
+#Main Program
+while True:
+    #Measure DHT22
+    print("Getting Sensor Values...")
+    time.sleep(5)
+    pin = Pin(28, Pin.OUT, Pin.PULL_DOWN)
+    sensor = DHT11(pin)
+    t  = (sensor.temperature)
+    h = (sensor.humidity)
+    print("SensorID: 1, Temperature: {}°C, Humidity: {:.0f}%\nWriting...".format(sensor.temperature, sensor.humidity))    
+    f = open("data.csv","a")
+    f.write("1,"+str(t)+","+str(h)+"\n")
+    f.close()
+    print("Done")
+    gc.collect()