mcsniper

I don t know how to do?wich op amp would i chose? termistor :NTC R=10k [25;60]ºc and tºref=36º op amp [0,5]V I don t know how could I do it Vout of op amp proporcional to Rtermistor which serve as entry to conversor A/D of 8 bits 25ºC->0V 60º->5V when tº exceed tºref(36ºc)+-5% .it produce: a-)PWM signal with period of 0.5ms and dutty cycle of 50% b-)signal (I don´t know the name it looks like tooth ) with period 0.5ms c-)activate exit to 220V