SmartHome.SG

Wednesday, January 11, 2017

Internet Relay Using ESP8266 220V 10A DC 7-30V Network Relay WIFI Board Module

Summary
Latest: The board has been removed as it randomly clicks the relay.

Using the ESP8266 220V 10A DC 7-30V Network Relay WIFI Board Module, I was able to setup an internet Relay to control an auto-gate.

Step 1.
Configure the ESP8266 relay to automatically connect to home wifi.
ESP8226 now becomes a local wifi relay.
Control is via web page.
Install ESP8266 into the auto-gate control, connect up 12VDC and the gate control relay input.

Step 2.
Pulse the relay on a local linux box to open/close the gate using curl.

>cat pulserelay
#!/bin/csh -f
curl --data "open_relay='x'" http://192.168.1.7
sleep 1
curl --data "close_relay='x'" http://192.168.1.7

Above csh script can now open / close the autogate

Step 3: Set up URL on another remote fixed IP server

3a: Setup a cgi on a remote linux fixed IP server

>cat opengate.cgi
#!/bin/csh -f
echo "Content-type: text/html"
echo
echo "<pre>"
echo "opening gate"
rsh raidserv /root/pulserelay
echo "gate opened"
echo "</html>"

Point "raiderv" to dynamic ip in /etc/hosts

Above opengate.cgi will rsh into local linux box "raidserv'

3b. Setup rsa keys

ssh-keygen -t rsa

Copy key for same user to raidserv authorized_keys.

Done.

Reference

https://ucexperiment.wordpress.com/

http://www.ebay.com/itm/ESP8266-220V-10A-DC-7-30V-Network-Relay-WIFI-Module-/182150587112

Wednesday, January 20, 2016

Simple Plant Irrigation Using Solenoid Valve

Pets and plants always makes it difficult to be away for extended periods.
Hence have always tinkered with irrigation systems.
Bought some battery operated timer irrigation system online but they break down way too quickly.

Here's my simple solenoid solution.

The key of the system is the 12VDC electric solenoid valve which will control when to water.


Electric Solenoid 12VDC

The controller is a simple timer switch. Its good to purchase a timer with 1 minute resolution.


Timer with 12VDC Power Adaptor

The pvc pipe runs across the front yard and sprays jets to the potted plants.


Pipe with holes to spray into pots below

Power is from an existing outlet


Existing Wall Power Outlet

Waterproof Box

Solenoid valves can be gotten from Ebay
http://www.ebay.com/itm/1-2-New-Electric-Solenoid-Valve-For-Water-Air-N-C-Normally-Closed-DC-12V-/400809593518?hash=item5d521d0aae:g:8LYAAOSw0vBUaxI1

Timers and 12VDC power adapter can be gotten from Sim Lim Tower

Fittings can be purchased from shop at blk 151 Serrangoon North.