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The component:
The component:
* Future Electronics B4090K Thermistor 47k 5%
* Listed in stores as "Future Electronics B4090K Thermistor 47k 5%"
* I think it may be this one http://uk.futureelectronics.com/en/Search.aspx?dsNav=Ny:True,Ro:0,Nea:True,N:477-4294920237
* I think it may be this one  
** http://uk.futureelectronics.com/en/Search.aspx?dsNav=Ny:True,Ro:0,Nea:True,N:477-4294920237
** http://uk.futureelectronics.com/en/Technologies/Product.aspx?ProductID=NTCLE100E3473JB0VISHAY8666240
* however, the Vishay product may be obsolete and the tolerance is listed as 1.5% rather than 5%


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Revision as of 10:41, 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:

Chime unit:

  • PCB labelled "RL-09B 04.02.27"
  • Batteries 4.5V, 3xAA
  • IC2: LP816A
Error in widget Flickr gallery: Unable to load template 'wiki:Flickr gallery'


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:

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 kΩ Tolerance (%): ±1.5 % B-constant: 4090 °K Temperature Range: -40 to +125 °C