relayPi

This lets me control my lamp with my wifi without an eval cloud.

Hardware

Raspberry Pi Zero with GPIO-pins

Relay-board with jumper-cable

Usb-charger and a bachmann-coupling

A Case

Sd-card image

I downloaded the the RASPBIAN STRETCH LITE and burned it to an sd-card using etcher

Headless, ssh, wifi and gpio

unless i did not had the adapters for my pi zero i booted the sd-card in a Pi3 with connected monitor and keyboard,

Set up wifi

On the Pi I edited the wpa_supplicant.conf sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

and type in my wifi-settings in the end of the file

network={
    ssid="Your WiFi name"
    psk="Your WiFi password"
}

Ssh

On the Pi I sudo raspi-config and changed password,hostname (to relaypi) and activated ssh (Interfacing Options -> SSH) I created the .ssh directory

install -d -m 700 ~/.ssh

Now I was able to connect to the pi remotely. And to make it convenient I copied my ssh key on the pi cat ~/.ssh/id_rsa.pub | ssh pi@relaypi 'cat >> .ssh/authorized_keys'

now accessing the pi is easy ssh pi@relaypi

GPIO and Java

the backend-server is using wiringpi so I installed it on the pi

sudo apt-get install wiringpi

install java

sudo apt-get update && sudo apt-get install oracle-java8-jdk

create a directory for the server mkdir ~/relay-pi-server

Run the server

./deploy.sh

Now I was able to control the the relays in my browser

Auto start the server when the pi boots

open

sudo nano /etc/rc.local

and add

printf "autostart relaypi"
java -jar /home/pi/relay-pi-server/relay-pi.jar >> /home/pi/relay-pi-server/relay-pi.log &

to it

Construction

I drilled some holes,

mounted the components with cable straps,

connected everything

and closed the box

nielsfalk / relay-pi