Wiring Steps Write device tree overlay Example click here Compile the device tree Example dtc O dtb o BBW100A0dtbo b 0 BBW100A0dts 3 Copy it to firmware ID: 441312
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Slide1
Temperature Sensor - Waterproof (DS18B20)Slide2
WiringSlide3
Steps
Write device tree overlay
Example(
click here
)
Compile the device tree
:
Example
:
dtc
-O
dtb
-o BB-W1-00A0.dtbo -b 0 -@ BB-W1-00A0.dts
3. Copy it to firmware:
Example
:
cp
BB-W1-00A0.dtbo /lib/firmware/
4. Load the device tree:
Example
:
echo BB-W1:00A0 > /sys/devices/bone_capemgr.9/slotSlide4
Test
Python:
import time
w1="/sys/bus/w1/devices/28-000002e34b73/w1_slave"
while True:
raw = open(w1, "r").read()
print "Temperature is "+
str
(float(
raw.split
("t=")[-1])/1000)+" degrees"
time.sleep
(1)
(source:
http://hipstercircuits.com/dallas-one-wire-temperature-reading-on-beaglebone-black-with-dto/
)Slide5
Test
2. C
Program
(available from “Resources” section of class website)