Msemtd HomeAuto

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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


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: 

  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...

The simplest circuits and Arduino code...

This is the best code I have found so far - from Thermistor2 but allows us to have our own parameters definition... 

 #define NOTTINGHACK_47K 4090.0f,298.15f,47000.0f  // B,T0,R0

 1 #include <math.h>
 2 // enumarating 3 major temperature scales
 3 enum {
 4   T_KELVIN=0,
 5   T_CELSIUS,
 6   T_FAHRENHEIT
 7 };
 8 
 9 // manufacturer data for episco k164 10k thermistor
10 // simply delete this if you don't need it
11 // or use this idea to define your own thermistors
12 #define EPISCO_K164_10k 4300.0f,298.15f,10000.0f  // B,T0,R0
13 #define NOTTINGHACK_47K 4090.0f,298.15f,47000.0f  // B,T0,R0
14 
15 // Temperature function outputs float , the actual
16 // temperature
17 // Temperature function inputs
18 // 1.AnalogInputNumber - analog input to read from
19 // 2.OuputUnit - output in celsius, kelvin or fahrenheit
20 // 3.Thermistor B parameter - found in datasheet
21 // 4.Manufacturer T0 parameter - found in datasheet (kelvin)
22 // 5. Manufacturer R0 parameter - found in datasheet (ohms)
23 // 6. Your balance resistor resistance in ohms  
24 
25 float Temperature(int AnalogInputNumber,int OutputUnit,float B,float T0,float R0,float R_Balance)
26 {
27   float R,T;
28 
29   R=1024.0f * R_Balance / float( analogRead(AnalogInputNumber) ) - R_Balance;
30   T=1.0f/(1.0f/T0+(1.0f/B)*log(R/R0));
31 
32   switch(OutputUnit) {
33     case T_CELSIUS :
34       T-=273.15f;
35     break;
36     case T_FAHRENHEIT :
37       T=9.0f*(T-273.15f)/5.0f+32.0f;
38     break;
39     default:
40     break;
41   };
42 
43   return T;
44 }
45 // example of use #1
46 // reading from analog input 1, using episco k164 definition
47 // and 10k balance, getting result in celsius
48 
49 void setup() {
50  Serial.begin(9600);
51 }
52 
53 void loop() {
54 
55  Serial.println("*************************");
56  Serial.println("10k Balance");
57  Serial.println(Temperature(1,T_CELSIUS,NOTTINGHACK_47K,10000.0f));
58  Serial.println("*************************");
59 
60  delay(500);
61 }



I certainly would like one of these data logger devices...


A Processing sketch to receive a number of sensor values on the serial line and do something with them... 

 1 int sensorCount = 5;  // max number of values to receive
 2 float[] sensorValues = new float[sensorCount];  // array to hold the incoming values
 3 
 4 import processing.serial.*;
 5 Serial myPort;                // The serial port
 6 
 7 int BAUDRATE = 9600; 
 8 //int BAUDRATE = 115200; 
 9 char DELIM = ','; // the delimeter for parsing incoming data
10 
11 PFont fontA;
12 
13 void setup() 
14 { 
15   size(200, 200);
16   smooth();
17   noStroke();
18   frameRate(3);
19   myPort = new Serial(this, "COM10", BAUDRATE);
20   // clear the serial buffer:
21   myPort.clear();
22 
23   fontA = loadFont("AlbaSuper-48.vlw");
24   // Set the font and its size (in units of pixels)
25   textFont(fontA, 48);
26 
27 } 
28 
29 float x, z;
30 
31 void draw() 
32 { 
33   background(100);
34 
35   fill(255, 204, 0);
36   text(""+sensorValues[0], 20, 50);
37 
38  
39   float diameter = min(width, height) * 0.75;
40   float lastAng = PI;
41   // scaling factor on sensor values...
42   float val = sensorValues[0] * 2.5;
43   fill(204, 102, 0);
44   arc(width/2, (height/2 + 50), diameter, diameter, lastAng, lastAng+radians(val));
45   
46   
47 } 
48 
49 
50 void serialEvent(Serial myPort) {
51   String serialString = myPort.readStringUntil('\n');
52   if (serialString == null)
53     return;
54   String[] vals = split(serialString, DELIM);
55   for (int i = 0; i < vals.length; i++) {
56     vals[i] = trim(vals[i]);
57     if (i >= sensorCount)
58       break;
59     println("vals["+i+"] = '"+vals[i]+"'");
60     float f = float(vals[i]);
61     if(!(""+f).equals("NaN"))
62       sensorValues[i] = f;
63   }
64 }
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