So for a little while I’ve wanted to make a home sensor net. Having just made the jump from renting a flat to owning a house now is the perfect time! I thought I’d spell out my current thoughts here. especially as someone was asking about the sensors I intend to use.
The principle of the system is to tell me when my home environment is bad, mmmkay? This could be that the temperature is too high, the humidity is too high/low, the building is on fire, someone’s in the house when I’m not or just that a room is too noisy. So to do this we need a few sensors. The ones I intend to use are
|DHT11||Humidity and Temperature Sensor|
|Mini PIR||Sensing motion|
The smoke sensor may get dropped as it uses a fair chunk of current (it has a heating element on board).
There are a fair few other components going onto the board, such as an ATMEGA328P and some chip (to be decided) to monitor the health of the lithium polymer battery. I’ll also need to include an opamp for the Mic, and also some voltage regs with shutdown pins (don’t want things using power when the thing is asleep!).
Getting all this back to a computer to analyse is going to be via XBee radios. I’m hoping to implement MQTT-S to go over these which should make life very easy for myself in the future!
If I have a prototype by Oggcamp I’ll bring it along