diff --git a/controller/README.md b/controller/README.md
index baa3325..74cf369 100644
--- a/controller/README.md
+++ b/controller/README.md
@@ -128,3 +128,22 @@ Edit /etc/dhcpcd.conf as follows:-
        static routers=192.168.1.1
        static domain_name_servers=192.168.1.1
 ```
+
+14. set up w1 thermometer sensing
+```
+DS18B20
+W1-thermometer sensing on RPI3
+
+wiring schema: https://cdn-learn.adafruit.com/downloads/pdf/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf (firrt schema - I used GPIO BCN #17)
+edit /boot/config.txt - at the end insert (rpi2 doesn't need the gpiopin, but rpi3 does! see for more info: http://raspberrypi.stackexchange.com/questions/37157/ds18b20-no-longer-working, rpi would need only: dtoverlay=w1-gpio):
+dtoverlay=w1-gpio-pullup,gpiopin=17
+
+reboot
+issue the following commands, the last directory has a variable name, based on the sensor's serial number!
+sudo modprobe w1-gpio
+sudo modprobe w1-therm
+cd /sys/bus/w1/devices
+ls
+cd 28-xxxx (change this to match what serial number pops up)
+cat w1_slave
+```