I'm doing this conversion and I have a problem. I must convert from 0°C to 30°C, and I know that the LM35 bring me 10mv/°C. Therefore, if the temp=30°C, the Vout=0,3V=Vmax. I amplify this output with the LM741 with a gain G=16,7, because like this my Vmax=5V. The output of the OPAMP goes directly to the ADC0804.
My question is: How do I do to show the temperature value in two display BCD 7-seg? What's the combinatorial circuit that I need to build?
I don't know how to pass from binary to BCD and also use only 5 bits to goes from 0 to 32.