The heart of the project is the atmel atmega328pu-20mhz clocked at 16mhz. The Sensors used are standard 10k to 10k NTC setups and reading the analog voltage of each sensor and converting it to a temperature.
The Oled is wired to the atmega via the SPI bus and the realy uses a digital i/o line.
As for the Wifi Option, a 3v3 with enable pin was used and the wifi board runs a script in nodemcu which reads data on the serial lines and transmits them to the smart device.
Shortly will upload the pcb files and source code !