The rasberry PI methrod is not that much more expensive. The Heatermeter/PI is also wreless and can be set up with email.
Rasberry PI $35
Heatermeter $12(components About $15)
Wifi adapter $10
Raspberry PI Heatermeter homemade temp controller, 2 UDS.
New Version 4.2 Heatermeter with K thermocouple support Available
PM me, if you would like a heatermeter pre-made, everything included, heatermeter, case, blower, SD card programmed, servo and case, no soldering needed ready for your network and BBQ.