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Topic: Home Heating Automation (Read 2 times) previous topic - next topic


Thanks for the link, they have much better pricing.  I plan an spending ~$50, to do a proof of concept, doing a reality check then going on from there.


So I got the Arduino, and battery packs and I'm just waiting for the servo.  I've been looking into the making my temperature sensor wireless nodes.  At first I was thinking that the xbee was going to be my best bet, but after doing some more research, and messaging a few members, I'm thinking that RF will work out well.  I have seen a lot of people using the RFM12, or RFM12B, but I think that I can use the RF-2400 for a good amount less money.  What do you guys think.

I have attached a schematic of what I think should work for a nice low cost, low energy usage RF node.  Is it alright to use the reset pin, P1, for reading the data from the temperature sensor? 

Another question that I have is how long can you sleep the ATTINY85 for, I believe I saw somewhere it was 9s.

Lastly jeelabs uses a p-mosfet to shut down the RFM12.  Would it be worth it to use the ATTINY84 to have more output pins for adding a p-mosfet?

Thanks for taking the time to read my silly questions.


I just noticed that the RF-2400 is supposed to be flipped 180°.  I'll fix it when I get home.



So I finally got the servo motor in the mail today.  I couldn't wait to hook it up.  The setup was really simple, the only thing I found odd was that when I started I was able to drive the servo off of pin 13.  After a couple of demos I couldn't use pin 13 any more.  So I've been using pin 2 to drive the servo now instead.  Any ideas about that? 

This is my very simple code.  I used java to communicate with my COM4 port to test out the servo.  It works great so far.  I'm currently trying to figure out what the range of this servo is, and I haven't found a datasheet for it yet.  I have the TowerPro 9805BB.

So the next step is going to be making this thing wireless I think.  I may even just use my laptop now to take commands over the LAN and send that data over com to the arduino.  That way I can program up an android app for my tablet.

After that I'm gonna start hooking up more servos.  To control all the servos I think I'm gonna buy one of these https://www.adafruit.com/products/815.  Has anybody used this breakout board before?  Any suggestions for what gage wire to used for the 6v and signal wires for 20-30ft before I go look it up?  Also does anybody know what would be a good 6v power supply.  Adafruit sells a 5V 10A power supply but I'd kinda like to supply 6V so I can get the most out of my servos.

Code: [Select]
#include <Servo.h>

Servo myServo;

int incomingByte = 0;

int nPulseWidth = 1500 ; // 1500, defined in servo.h

void setup()

  // the library sets all servos to 1500 ms pulse width by default, this is center for a steering servo
  Serial.println("Completed setup"); 

void loop()
  if (Serial.available() > 0) {
    incomingByte = Serial.read();
    if(incomingByte>0 && incomingByte<180){
      nPulseWidth = (int) (incomingByte/90.0*1000 + 500);
      Serial.print("Sending Servo: ");

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