Vermes
Advanced Member level 4
It is a neat panel thermometer on a well-known system DS18B20. The main element is Atmega8 SMD. Software was written in WinAVR.
The thermometer additionally is equipped with the function of thermostat. To minimize the size of the device, there are no buttons to change settings (it has to be rather the thermometer itself and optional thermo-controller parameters may be set programmatically) nor ISP connectors. In order to program the processor, you have to solder ISP socket on the cables, as shown in one of the following pictures.
The PCB was made in Eagle in thermal transfer method. The dimensions of the PCB: 64mm wide x 35mm high. The display used was LED4-AF-05643FS-B PBF. The height from the bottom of the PCB to the front of the display is 13mm.
To use the system as a thermoregulator, connect the relay through the NPN transistor in the EC circuit through the base resistor to pin PB5 – SCK and the common mass.
Link to original thread (useful attachment) – Zgrabny termometr/ termostat panelowy DS18b20 + Atmega8 +LED
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