Raspberry Pi Kegerator Monitoring

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Measuring the flow through a multiple kegs to determine how much is left and displaying details on screen along with kegerator temp.

Kayser-Sosa

1

Install Raspberry Pi OS

Download the latest OS from https://www.raspberrypi.org/downloads/noobs/.

Format the SD card.

Extract the ZIP file to the SD card.

Select the Rasbian OS and install.
2
Configure the Raspbian OS
```
sudo raspi-config
```
1 - Change default pi user password

2 - Hostname
- choose a host name of your liking
4 - Localization Option
- I2 - Change Timezone
  select your country
  select your time zone
- I4 - Change Wi-fi Country
  select your country
5 - Interfacing Options
- P2 - SSH
  Yes
8 - Update
3
Disable Text Terminals from Blanking
```
sudo nano /etc/kbd/config
```
- Edit the following lines to show as follows.
```
BLANK_TIME=0
BLANK_DPMS=off
POWERDOWN_TIME=0
```

4

Configure the WiFi

sudo nano /etc/network/interfaces

Comment out the following lines by adding a "#" before each.

iface wlan0 inet manual    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Add the following lines, where "wireless-ssid" is your SSID and "wireless-password" is your password.

iface wlan0 inet dhcp
    wpa-ssid "wireless-ssid"
    wpa-psk "wireless-password"

Reboot.

sudo shutdown -r now

5

Install Software

Install Git

sudo apt-get update
sudo apt-get install git -y

Install Pygame

sudo apt-get install python-pygame -y

Add OneWire Support

sudo nano /boot/config.txt

Edit the file adding the following line to the bottom.

dtoverlay=w1-gpio

Reboot.

sudo shutdown -r now

6

KS-KegBerry Code

Download the code.

git clone https://github.com/KayserSosa/KS-KegBerry.git

7
Bench Test Hardware
Temporarily wire all the electronics up.

Flow Meter 1 (Left):
- Red to Pin 2 (5 V)
- Black to Pin 6 (Ground)
- Yellow to Pin 16 (GPIO 23)
Flow Meter 2 (Middle):
- Red to Pin 2 (5 V)
- Black to Pin 6 (Ground)
- Yellow to Pin 18 (GPIO 24)
Flow Meter 3 (Right):
- Red to Pin 2 (5 V)
- Black to Pin 6 (Ground)
- Yellow to Pin 22 (GPIO 25)
Temperature Sensor:
- Red to Pin 1 (3.3 V)
- Black to Pin 6 (Ground)
- Yellow to Pin 7 (GPIO 04)
8
Bench Test
Run the KS-KegBerry code.
```
cd KS-KegBerry
sudo python KS-kegberry.py
```
Blow air through each of the flow meters. (Make sure you are blowing in the correct direction.)
Hold the temperature sensor and verify if increases and decreases correctly.
If everything is working correctly, continue on, if not troubleshoot the issues.

9

Setup Auto Login

Source: https://stackoverflow.com/questions/33753985/raspberry-pi-auto-login-without-etc-inittab

Create a new service.

sudo mkdir –pv /etc/systemd/system/getty@ttyl.service.d
sudo nano /etc/systemd/system/getty@ttyl.service.d/autologin.conf

Add the following lines and save/close the file.

[Service]
ExecStart=
ExecStart=-/sbin/agetty –autologin pi –noclear %I 38400 linux

10
Setup Auto Execute on Startup
Source: http://www.instructables.com/id/Raspberry-Pi-Launch-Python-script-on-startup/
Create the launcher script.
```
sudo nano launcher.sh
```
Add the following lines and save/close the file.
```
#!/bin/sh
# launcher.sh
# Navigate to home dir, then to program dir, then execute, then back home
cd /
cd home/pi/KS-KegBerry
sudo python KS-kegberry.py
cd /
```
Make the file executable.
```
sudo chmod 755 launcher.sh
```
Add a logs directory to the home directory.
```
sudo mkdir logs
```
Open up Crontab.
```
sudo crontab -e
```
Add the following line to the bottom and save/close the file.
```
@reboot sh /home/pi/launcher.sh >/home/pi/logs/cronlog 2>&1
```
Reboot.
```
sudo shutdown -r now
```

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