[SOLVED] Read ADC Voltage and display in seven segment

[rahul bhalla]

Hello Seniors

Actually i want to create a program in which i applied some AC Voltage on the ADC channel of PIC 16f877a micro-controller with the help of some divider and i want to display value read by ADC
5V --> 230V
2.5V --> O
0V AC --> -230V
how can i create code please explain in detail so that i can understand the concept and i am using MikroC

thanks in advance

 

[BradtheRad]

This sort of project comes up often. See the list of similar threads at the bottom of this page. If you click on one, it may lead to other threads which will give you the information you are looking for.

 

[rahul bhalla]

Sir
thanks for the reply
Is it possible to calculate the frequency of voltage???? if yes please explain it...

 

[tpetar]

https://www.pcbheaven.com/wikipages/Frequency_Measuring/

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You can use optocoupler to detect zero crossing.

 

[ashugtiwari]

1. Use transformer to step down from 230rms to 5V rms and then u can send it to ADC after clamping the mean valuw of voltage to positive side. This will also provide isolation from line and use surge protection at transformer secondary to minimize hard to ADC and circuit. Transformer is best and mostly used solution.
2. Instead, u can go for triac, where u can switch on the triac, and the 230V from line is voltage divided by using power resistor. Use current sense circuit to detect current surges and switch off the triac. If u r rectifying i/p, u can use zener diode to protect against current surges. U can also use op-amp based voltage stabilizer to maintain the dynamic range of 0 to 5V.
3. U can capacitively couple the triac output, to protect against surges.

Code is pretty simple, just run the ADC at 1 ksps and u get minimum of 20 samples per cycle which will also preserve the sine wave shape pretty nicely.

 

[rahul bhalla]

thanks for the reply