HousMon - House Monitoring with ATMega
This was a small one week project to build a house monitoring system that gives information about inside and outside temperatures, brightness, window and door state.
Functionality
- Summerize house state, temperature, brightness, window/door state
- If window and door are open this system warns you (flashing of red LEDs), so you don't forget to close the window before leaving
- HousMon starts flashing with green or blue LED if you could reach the aim temperature of 23°C through opening or closing the window
- In darkness the LCD backlight is enabled automatically. Even darker all LEDs are enabled to give some sort of emergency-light
- In the sleep-mode all above described functions are disabled. Only if the door opens while in sleep-mode HousMon will try to wake you up through flashing with all LEDs
Video
in production
Of course you can extend the software or hardware, so you control the window automatically for example or connect a sound system to the microcontroller.
Usage
Software
Compiling this software can be done through several ways. I used avr-eclipse for development. With that plugin you can easily configure your hardware and program the device.
HousMon-1.0.tar.bz2
Hardware
To use the software as it is, you have to connect your parts with the ATMega like that:
| Part | ATMega-Pin |
| Buttons left to right pulled up to V+ | PB3 - PB0 |
| Reset-button pulled up to V+ | RESET |
| LCD DB0 - DB7 | PD7 - PD0 |
| LCD RW | PB7 |
| LCD RS | PB6 |
| LCD BL | PB5 |
| LCD E | PB4 |
| NTC-Resistor voltage divider inside | PA1 |
| Photoresistor voltage divider inside | PA0 |
| NTC-Resistor voltage divider outside | PA1 |
| Photoresistor voltage divider outside | PA0 |
| Door-contact pulled up to V+ | PA3 |
| Window-contact pulled up to V+ | PA5 |
| V+ | VCC and AVCC |
| GND | GND |
| LEDs white | PC0 |
| LEDs red | PC2 |
| LEDs green | PC3 |
| LEDs blue | PC1 |
As you can see, you need some 10K resistors to pull up the pins. Perhaps you could also change the software to use the atmega internal pullup resistors.
Don't forget to use transistors to control the LED backlight and LEDs.
Sample-boards
Here are some pictures of the boards i constructed (no i am not good at soldering):
License
HousMon is a small house monitoring program for an atmega
Copyright (C) 2010 Markus Pargmann (mpargmann <AT> allfex.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.