Msemtd HomeAuto

Michael's Home Instrumentation

• New porch doors have required me to rethink my doorbell!
• We can't hear people knocking on the door
• The people at the door don't know if the old doorbell actually rang
• The old wireless doorbell often didn't ring because the batteries were flat!
• The wireless doorbell didn't require drilling holes in the doorframe - this is a plus
• the 12V battery in the wireless doorbell pushbutton was expensive!

I want to do something simple with the old wireless doorbell and start to develop an extensible home automation/instrumentation project. I have a Nanode and a number of Xinos which I intend to connect on a 4-wire bus around the house.

The old doorbell

Push-button:

• PCB labelled "RL-09 04.04.23"
• Battery 12V A23S "Replaces: 23A, MS21/MN21" A23 on WP cheap 10x pack
• IC1: LP801/V8

Chime unit:

• PCB labelled "RL-09B 04.02.27"
• Batteries 4.5V, 3xAA
• IC2: LP816A

http://www.alldatasheet.com/view.jsp?Searchword=HCF4069UBE

The Nanode - Xino 4-wire Bus

Using a Nanode at my internet gateway router and communicating with and powering multiple slave Xinos on a 4-wire bus...

http://wiki.hackspace.org.uk/wiki/Project:Nanode/Applications#Using_the_Local_Serial_Bus

http://sustburbia.blogspot.com/2010/08/wired-network-for-arduinos.html

Read nanode MAC address: -

https://gist.github.com/1020951#file_nanode_mac.pde

 MAC Address Read Test
 MAC address is 00:04:A3:03:DD:C7

The soil moisture tester

Do these plants need watering?

http://www.instructables.com/id/Garduino-Gardening-Arduino/

Temperature

I have a bag of surplus 47k thermistors and I intend to build a number of circuits to measure temperature starting with the very simplest and culminating in a teachable HackSpace project with reasonable accuracy.

The component: Future Electronics B4090K Thermistor 47k 5%