Diagrams - Top Level Design for Temperature control User...

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SN74LS85N 4-Bit Digital Comparator A3..A0 B3..B0 I(A<B) I(A=B) I(A>B) O(A>B) O(A=B) O(A<B) +5V User Input A/D Converter Display 1 Display 2 Fan/Heater Power Distribution and V Raw Reading T Reading < T Desired T Reading > T Desired V Raw Safety Switch Safety LED (On if safety is set and fan /heater OFF ) LED Display Red , Yellow, or Green 330 V Raw to V Rdy Difference Inverting Amplifier V Raw V Rdy V Rdy A3..A0 A3..A0 B3..B0 Top Level Design for Temperature control Slow Clock B3..B0
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SN74LS85N 4-Bit Digital Comparator A3..A0 B3..B0 I(A<B) I(A=B) I(A>B) O(A>B) O(A=B) O(A<B) +5V User Input A/D Converter Display 1 Display 2 Fan/Heater Power Distribution and V Raw Reading T Reading < T Desired T Reading > T Desired V Raw Safety Switch Safety LED (On if safety is set and fan /heater OFF ) LED Display Red , Yellow, or Green 330 V Raw to V Rdy Difference Inverting Amplifier V Raw V Rdy V Rdy A3..A0 A3..A0 B3..B0 B3..B0 Top Level Design for Temperature control
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Relay 1 Relay 2 +5V Heater Fan +10V C Fan Thermistor T Reading < T Desired T Reading
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