add multi sensor example

Author: caternuson

examples/ds18x20_multi.py

@@ -0,0 +1,33 @@
+# Example of specifying multiple sensors using explicit ROM codes.
+# These ROM codes need to be determined ahead of time. Use `ow_bus.scan()`.
+#
+# (1) Connect one sensor at a time
+# (2) Use `ow_bus.scan()` to determine ROM code
+# (3) Use ROM code to specify sensors
+
+import time
+import board
+from adafruit_onewire.bus import OneWireBus, OneWireAddress
+from adafruit_ds18x20 import DS18X20
+
+# !!!! REPLACE THESE WITH ROM CODES FOR YOUR SENSORS !!!!
+ROM1 = b"(\xbb\xfcv\x08\x00\x00\xe2"
+ROM2 = b"(\xb3t\xd3\x08\x00\x00\x9e"
+ROM3 = b"(8`\xd4\x08\x00\x00i"
+# !!!! REPLACE THESE WITH ROM CODES FOR YOUR SENSORS !!!!
+
+# Initialize one-wire bus on board pin D5.
+ow_bus = OneWireBus(board.D5)
+
+# Use pre-determined ROM codes for each sensors
+temp1 = DS18X20(ow_bus, OneWireAddress(ROM1))
+temp2 = DS18X20(ow_bus, OneWireAddress(ROM2))
+temp3 = DS18X20(ow_bus, OneWireAddress(ROM3))
+
+# Main loop to print the temperatures every second.
+while True:
+    print("Temperature 1 = {}".format(temp1.temperature))
+    print("Temperature 2 = {}".format(temp2.temperature))
+    print("Temperature 3 = {}".format(temp3.temperature))
+    print("-" * 20)
+    time.sleep(1)