Update README.md

README.md

@@ -17,7 +17,74 @@ RESET             | 0x06 | (w) | 0
 GET_VERSION       | 0x07 | (r) | 1
 
 ###Raspberry Pi example
-This is a RasPi example provided by user *krikk*
+
+This is interface class provided by Daniel Tamm and Jasper Wallace
+```python
+#!/usr/bin/python
+# cannot use python3 because smbus not working there
+# Modified script from https://github.com/JasperWallace/chirp-graphite/blob/master/chirp.py
+# by DanielTamm
+
+import smbus, time, sys
+
+class Chirp:
+	def __init__(self, bus=1, address=0x20):
+		self.bus_num = bus
+		self.bus = smbus.SMBus(bus)
+		self.address = address
+
+	def get_reg(self, reg):
+		# read 2 bytes from register
+		val = self.bus.read_word_data(self.address, reg)
+		# return swapped bytes (they come in wrong order)
+		return (val >> 8) + ((val & 0xFF) << 8)
+
+	def reset(self):
+		# To reset the sensor, write 6 to the device I2C address
+		self.bus.write_byte(self.address, 6)
+
+	def set_addr(self, new_addr):
+		# To change the I2C address of the sensor, write a new address
+		# (one byte [1..127]) to register 1; the new address will take effect after reset
+		self.bus.write_byte_data(self.address, 1, new_addr)
+		self.reset()
+		self.address = new_addr
+
+	def moist(self):
+		# To read soil moisture, read 2 bytes from register 0
+		return self.get_reg(0)
+
+	def temp(self):
+		# To read temperature, read 2 bytes from register 5
+		return self.get_reg(5)
+
+	def light(self):
+		# To read light level, start measurement by writing 3 to the
+		# device I2C address, wait for 3 seconds, read 2 bytes from register 4
+		self.bus.write_byte(self.address, 3)
+		time.sleep(1.5)
+		return self.get_reg(4)
+
+	def __repr__(self):
+		return "<Chirp sensor on bus %d, addr %d>" % (self.bus_num, self.address)
+
+if __name__ == "__main__":
+	addr = 0x20
+	if len(sys.argv) == 2:
+		if sys.argv[1].startswith("0x"):
+			addr = int(sys.argv[1], 16)
+		else:
+			addr = int(sys.argv[1])
+	chirp = Chirp(1, addr)
+
+	print chirp
+	print "Moisture\tTemperature\tBrightness"
+	while True:
+		print "%d\t%d\t%d" % (chirp.moist(), chirp.temp(), chirp.light())
+		time.sleep(1)
+	```
+
+This is another RasPi example provided by user *krikk*
 ```python
 #!/usr/bin/python