Digital temperature sensor
Description.
Here is a straight forward ,yet effective digital temperature controller that can be used with temperature control systems.
The circuit uses IC LM 35 (IC3) to sense the temperature.The output of LM 35 is given to the IC ADC 0804 (IC4) which converts the analog output of the LM 35 to digital output.The ADC 0804 is a 8 bit ADC .Eight LED’s are connected to the output of ADC to show the output logic.If needed the LED’s can be avoided and the output can be connected to any suitable external circuit like temperature controller etc.A 5V fixed voltage regulator based on 7805 (IC1) powers the circuit.Another variable voltage regulator based on LM317(IC2) is used to provide the reference voltage to the ADC 0804.
Circuit diagram with Parts list.
Notes.
- POT R10 can be used to adjust the scale factor of the ADC.The reference voltage at pin 7 of ADC0804 should be 2.5 V for full scale.
- Assemble the circuit on a good quality PCB or common board.
- If 1A bridge is not available make one with four 1N 4007 diodes.
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Some neat info you have here, excellent work !!!
Hi i am actually using this circuit in my assignment. i am doing my circuit in Proteus. is there any need to connect pin8,10 and 20?
I also need the detail of the component used after the bridge (AC 230V) It has the symbol of a transformer but i am not sure at all. please help me out.
Thanks
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i am sorry and never repeat this
Hi Shaban and Vysakh please communicate in english such that others can also use your valuable information.
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واعاملين شكر جدا جداشكرا جزيلا لكل القائمين على الموقع
واعاملين شكر جدا جداشكرا جزيلا لكل القائمين على الموقع
please i need full description of the circuit. thanks
plz put full description, I got problem in the simulation ?
pin number 20 is connected to where? also 8 and 10 ? for pin number 7 need to connect to -2/5 or +2/5 ?
i simulated in proteus but i can’t get the result plz describe it if is possible
thanks alot
hi it seems to be a good circuit for ADC can you send us more information about circuit. thanks alot
requaire full discription of circuit diagram
i want to make this circuit can you help me…………….
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Thanks for providing imformation