Hi guys im trying to build a temperature sensor which has a reading reflecting on a digital display. Similarly to this one but the problem im having is that i need to simulate this on a bradboard with a bench supply voltage . Can anyone assist in giing alternative schamatics to adjust the circuit such that it can be completed in a lab . I have a project to complete and its doing my heading . Thank you all !
Thanks for the quick response . Im not sure if im able to simulate the whole circuit to a bread oard. As we can all see , the bottom part of the circuit functions with a high voltage supply which is diluted by a step down transformer . Now my question is . Is this whole circuit feasible and how do i simulate it to a breadboard in a lab, with probably a signal generator as supply voltage ? I assumed there could be an alternative circuit without the bottom half of the circuit comprising of a high voltage supply, step-down,transformer, regulator etc? I dont have a problem with the top part of the circuit has it has a reasonable voltage supply ! So how do i substitute the bottom higher voltage panel ?
Thanks for the quick response . Im not sure if im able to simulate the whole circuit to a bread oard. As we can all see , the bottom part of the circuit functions with a high voltage supply which is diluted by a step down transformer . Now my question is . Is this whole circuit feasible and how do i simulate it to a breadboard in a lab, with probably a signal generator as supply voltage ? I assumed there could be an alternative circuit without the bottom half of the circuit comprising of a high voltage supply, step-down,transformer, regulator etc? I dont have a problem with the top part of the circuit has it has a reasonable voltage supply ! So how do i substitute the bottom higher voltage panel ?
You would use a bench 'dc' power supply set for +5V [ this would replace the 7805]
Use a variable resistor, say about 5KΩ connect one end to +5V and the other end to 0V,,, the wiper would be the Vref to the ADC, [ this would replace the LM317]. The Vref would be good enough for a bench test.
You would use a bench 'dc' power supply set for +5V [ this would replace the 7805]
Use a variable resistor, say about 5KΩ connect one end to +5V and the other end to 0V,,, the wiper would be the Vref to the ADC, [ this would replace the LM317]. The Vref would be good enough for a bench test.
I assumed i could connect the led's to a binery count driver , 555 timer and then a display ...something of that configuration is what i may want to add up to garnish the circuit . Is there an extra schematic to add to the one above.
Absolutely.......my tutor is pressuring us to go an extra mile and to be honest , the above configuration has helped a lot . But now the numeric display will crucify the task with surgical precision . I have also written this req on this forum plus your response in my LOGBOOK. EVERY HELP I GET THROUGH RESEARCH HAS TO BE RECORDED .
Absolutely.......my tutor is pressuring us to go an extra mile and to be honest , the above configuration has helped a lot . But now the numeric display will crucify the task with surgical precision . I have also written this req on this forum plus your response in my LOGBOOK. EVERY HELP I GET THROUGH RESEARCH HAS TO BE RECORDED .
I thought if the temperature reading could be read on a numerical digital display . From the circuit above i thought we could use this principle
The output of the ADC can be interfaced to a 7-segment diaply using a 7-segment driver or the digital output can be interfaced to a PC / microcontroller. The bottom portion of the schematic shows a fixed and a variable power supply which inputs 220 volts AC from the wall outlet in your house, the transformer then steps-down it to 18 volts AC (9-0-9 centre-tapped), which is then converted to DC using bridge rectifier.
A microcontroller (cough) like the 16F88 (muxed displays) or 16F886 (non muxed) could do the A/D & display decoding & driving all within a single part.
A microcontroller (cough) like the 16F88 (muxed displays) or 16F886 (non muxed) could do the A/D & display decoding & driving all within a single part.