low cost heating controller

[maxa]

Low-cost Heating Controller,iss.371,Nov.2007.

According to the magazine “Elektor” and by using informations from websites I made “Low cost heating controler” .The device I connect to gas boiler Viessmann Vitopend100 and “fussbodenheizung”.
But,I remark on two problems:

1. Incorect reading of the boiler temperature(3 -9°C),as well as outside temperature(1-4°C).This problem is not to serious,but it would be usefull to put some solution of calibration of sensors at two points.

2. “Schalthysterese” is very small(1,5°C).In my case water pump continue to work after gas valve is turned off. Frequency of turning on/off boiler is too high(2-3 per minute),wich is in my opinion unacceptable.I think this could be avoided by software or software/hardware(jumpers) solution for choosing hysteresis(3-15°C).

Unfortunately,my knowedge about programing is unsuficient so I can`t solve these problems.I tried to use CVAVR(evaluation V2.03.9 and V2.03.4standard),but when I got to the point to compile original main.c (for by reason of exercis ),I recived information about error(L80:missing `]`),so I give up.
.At the moment,I can`t use the device!

I had sent three e-mails with same questions on following address(buss@mikrocontroller.com, ingo@mikrocontroller.com, info@mikrocontroller.com) but I did not receive any answer.

Please,help me!