Raspberry Pi Experiment 13: Thermal sensor and more

Goals:

– to accomplish the anemometer assembling and to connect it to the sensors prepared earlier

– provide additional 5V DC power source for the times when development is done; this power source will also eliminate the need to unseal the box for batteries recharge; this power source is planned to be removed completely after the solar and wind power sources will provide sufficient recharge along with anemometer’s adaptive behavior for power consumption optimization.

– enable reading of temperature data from the additional sensor

– live publishing of the temperature data

Related Experiments:

Components:

– Temperature sensor DS18B20: waterproof version (ebay)

– 4.7K Ohm resistor (ebay)

Software:

temperature_resolver class at 05_wind_speed_meter.py

Schematics:

Testing Temperature sensor manually through One-Wire interface:
1) by means of Advanced configuration settings at ‘sudo raspi-config’ enable i2c and spi
Also possible through direct editing of /boot/config.txt (command ‘sudo nano /boot/config.txt’)
dtparam=i2c_arm=on
dtparam=spi=on

2) Then add One Wire interface at /boot/config.txt (use command ‘sudo nano /boot/config.txt’)
dtoverlay=w1-gpio-pullup, gpiopin=4
3) Initialize modprobe
sudo modprobe w1-gpio
sudo modprobe w1-therm

4) Find your thermometer device (should be 28-XXXXXXXX) as so:
ls -l /sys/bus/w1/devices

5) The data we will need to translate to Celsius/Fahrenheit may be seen as so:
cat /sys/bus/w1/devices/28-<your device id>/w1_slave

Pictures:

– long wires were attached to relevant RPi pins