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-rw-r--r--esp8266/modules/ds18x20.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/esp8266/modules/ds18x20.py b/esp8266/modules/ds18x20.py
index fc53048f8e..bf06094835 100644
--- a/esp8266/modules/ds18x20.py
+++ b/esp8266/modules/ds18x20.py
@@ -1,6 +1,8 @@
# DS18x20 temperature sensor driver for MicroPython.
# MIT license; Copyright (c) 2016 Damien P. George
+from micropython import const
+
_CONVERT = const(0x44)
_RD_SCRATCH = const(0xbe)
_WR_SCRATCH = const(0x4e)