Msemtd HomeAuto: Difference between revisions
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== Temperature == | == Temperature == | ||
I have a bag of surplus 47k thermistors (about 500) 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. | I have a bag of surplus 47k thermistors (about 500) 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. We will put these devices in fridges, near heat sources, near doors, windows, indoors, outdoors, you name it. | ||
The component: | The component: | ||
Revision as of 10:57, 8 December 2011
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 (about 500) 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. We will put these devices in fridges, near heat sources, near doors, windows, indoors, outdoors, you name it.
The component:
- Listed in stores as "Future Electronics B4090K Thermistor 47k 5%"
- I think it may be this one
- however, the Vishay product may be obsolete and the tolerance is listed as 1.5% rather than 5%
VISHAY
NTCLE100 Series NTC 47 kOhm ±1.5 % Radial Leaded Standard Precision Thermistor
Mfr Part#: NTCLE100E3473JB0
Packaging : BAG
Std Packaging Qty: 500
Min Order Qty: 1
As low as: £0.1751 (GBP)
In Stock: No
Type:
NTC
Resistance:
47 kO
Tolerance (%):
±1.5 %
B-constant:
4090 °K
Temperature Range:
-40 to +125 °C
Some Google digging reveals...
- http://www.vishay.com/docs/29049/ntcle100.pdf
- these thermistors are colour coded
The simplest circuits and Arduino code...