Air conditioner (fan) controller
Finally I decided to write about my little development. The car has air conditioning (not to be confused with climate control), we press a button on the panel, the air conditioning system is turned on and cold air blows from
The idea was to develop a two-in-one device: 1. A car watch with a 24-hour time format (yes, that was the main thing). 2. Air conditioning controller. In my Lancer there is a standard clock and in their place the 8x2 LCD display perfectly fits (I used the WH0802A indicator on the popular HD44780 controller).
He developed a circuit on atmega8, parted a signet:
In addition, a separate small board is a clock module on the DS1307 (I took a quartz with capacitors for greater stability from the motherboard).
The most tormented with the logic of operation and shutdown, input thresholds, etc. The code was written in CodeVisionAVR. I wanted to give a piece of code as an example, but I don’t know which one. All - a lot, but in pieces and so everything is clear.
After the assembly, it turned out:
Later I put another LCD - the one in the first photo (the test was 16x2).
operation of the device can be viewed on the video at the link: dl.dropboxusercontent.com/u/25037786/habr/Cond/VID_20130221_190747.3gp
or on youtube:
The necessary temperature is set on the controller, the cooler blows on the temperature sensor (DS18B20), it cools down, the cooler turns off. To make it clearer on the video, I set the thresholds less. For better temperature measurement, you can install several sensors in different places (the protocol of sensors allows them to be parallelized). Instead of a cooler, we connect to the on / off button of the air conditioner and enjoy the constant temperature in the cabin. Everything is simple - everything works. In fairness, I’ll say that the device has not been installed in the car, but I plan to.