Digital LED Thermometer

Components:

- A Raspberry Pi Zero W

- A 1.5 Inch OLED Module by Waveshare

- A 5V 2.4A Power Supply for Raspberry Pi

- A 5m WS2812B LED Strip, 30 LEDs/m

- Screws, washers, bolts and standoffs.

- A Custom PCB, with buttons, a switch, an ldr, pin-headers, and more

- Soldering iron and solder

- Hot glue

- Wood glue

- 4mm and 6mm plywood

- 3mm white acrylic

Weather data

Credit to StuffWithKirby for his code on reading JSON weather data in python.

We get the weather data from OpenWeatherMap.org.

1. Start by making a FREE account on OpenWeatherMap.org.

2. Then copy your api-key to use later.

3. Now download and open the city.list.json file, and search for the cities you want displayed, and copy the city-id's for later.

• Download .zip

Setting up the RPi with Oled

Make sure the RPi is connected to the internet

1. Enable the I2C and SPI function in raspi-config under Interfacing Options. Exit and reboot.

2. Run this to update:

sudo apt-get update

3. Run the following commands to install the necessary libraries:

sudo apt-get install python-dev
#sudo python setup.py install
sudo apt-get install python-smbus
sudo apt-get install python-serial
sudo apt-get install python-imaging

4. Run the following command to open the configuration file:

sudo nano /etc/modules

Make sure the following two lines, are in the configuration file, then exit and reboot:

i2c-bcm2708
i2c-dev

5. Now run this to clone my github repo:

git clone https://github.com/Anders644PI/1.5inch-OLED-with-RPi.git
cd 1.5inch-OLED-with-RPi

6. Unzip wiringPi.zip:

unzip wiringPi.zip
cd wiringPi

And run these commands:

chmod 777 build
./build

Check the installation with:

gpio –v

7. Go back to the main folder, by typing cd /home/pi/1.5inch-OLED-with-RPi/. Then unzip bcm2835-1_45.zip

unzip bcm2835-1_45.zip
cd bcm2835-1_45.zip

8. Then run this, to install the library:

./configure
make
sudo make check
sudo make install

9. Again go back to /home/pi/1.5inch-OLED-with-RPi/, and run this, to test the oled:

sudo python /Demo_Code/Python/main.py

Setting up the Pi with LEDs

1

Source: https://tutorials-raspberrypi.com/connect-control-raspberry-pi-ws2812-rgb-led-strips/

1. We install the required packages (confirm with y):

sudo apt-get install gcc make build-essential python-dev git scons swig

2. The audio output must be deactivated. For this we edit the file

sudo nano /etc/modprobe.d/snd-blacklist.conf

Here we add the following line:

blacklist snd_bcm2835

3. We also need to edit the configuration file:

sudo nano /boot/config.txt

4. Now find this line:

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

And comment it out.

# Enable audio (loads snd_bcm2835)
#dtparam=audio=on

5. Now reboot:

sudo reboot

Setting up the Pi with LEDs

2

1. Now we can download the library:

git clone https://github.com/jgarff/rpi_ws281x

2. Run this:

cd rpi_ws281x/
sudo scons

3. And this:

cd python
sudo python setup.py build
sudo python setup.py install

4. Reboot and run the script:

sudo python /pi/home/1.5inch-OLED-with-RPi/OLED_driver_and_code_python/Temp-display-cities-led-after-button-ldr-next-v3.py

Configuring the Weather API

1. Cd into LED_Thermometer_Code_and_OLED_driver:

cd LED_Thermometer_Code_and_OLED_driver

2. Then open Official_Digital_LED_Thermometer_v1-0.py:

nano Official_Digital_LED_Thermometer_v1-0.py

And then scroll down and edit the api-key, to your api key, from openweathermap.org, as shown in the image on the right.

Also change the city-ids and city names, to your desired locations.

The Custom PCB

I then made a custom PCB, to solder all of the electronics onto.

The Laser Cut Enclosure

Then I modeled an enclosure, and laser cut it out of 4mm and 6mm plywood. I also modeled in LED diffusers, which i cut out in 3mm acrylic.

After that I attached the electronics and the LED-strip to the laser cut plywood. And I then assembled the enclosure, partly with glue and friction.