Reading problem of ACS712 hall effect sensor with PIC16F877A

[navidbox]

Dear Friends,

Project Description: Data Acquisition System for Solar Panel

In fact, i need to measure the current from solar panel and display it on the LCD.

I am using PIC16F877A with C language to do so. For the Temperature, Light, and Voltage, there is no issue of reading the sensors and it is working perfectly. However, ACS712 hall effect sensor is mentioned to be a good solution for DC current measurement in the datasheet as well as having a linearity characteristic, but the time i am using it with PIC, it does not give me a true value within at least 0-50 A input ranges.
This is the Proteus + ADC codes, Please help me to accomplish this task as well.


ADCON0=CHANNEL3;

lcd_goto(44);
read_adc();
current=read_temp();
current=0.074*current;
current=(current-37.888);
current=current/2;

dis_num(current);
send_char('.');
dis_num(current%10);

send_char(' ');
send_char('A');
send_char(' ');

[shahrul]

If you have no problem on reading Temperature, Light, and Voltage, so you have no problem with ADC. The problem here is the ACS712 sensor no exactly linear. I have used this before, see code here.

[navidbox]

If you have no problem on reading Temperature, Light, and Voltage, so you have no problem with ADC. The problem here is the ACS712 sensor no exactly linear. I have used this before, see code here.

Dear Shahrul,

Thanks for your comment in Forums of Cytron related to ACS712.
It helped me to solve the problem.

May i ask the following questions:

1- ACS712 is able to measure the current till what value? (Input to the ACS712)

2- Write me the code to display 20.15 instead of (20.1)- I can't get the exact code for that within your program.

3- Do you have any experience with LABVIEW for real time monitoring of analog measurement?


Can i have your email address to keep in touch?

Thanks in advance.

[shahrul]

1- ACS712 is able to measure the current till what value? (Input to the ACS712)

The sensitivity either 66mV/A, 100mV/A, 185mV/A. The real, you just test it.

2- Write me the code to display 20.15 instead of (20.1)- I can't get the exact code for that within your program.

Not my job to write you a code.

3- Do you have any experience with LABVIEW for real time monitoring of analog measurement?

I never use LABVIEW yet

[robosang]

Not my job to write you a code.

Shahrul, good point you have there!

[navidbox]

1- ACS712 is able to measure the current till what value? (Input to the ACS712)

The sensitivity either 66mV/A, 100mV/A, 185mV/A. The real, you just test it.

I mean is it able to measure 50A? it means that 66 (mV/A) * 50 A=3.3 V

2- Write me the code to display 20.15 instead of (20.1)- I can't get the exact code for that within your program.

Not my job to write you a code.

3- Do you have any experience with LABVIEW for real time monitoring of analog measurement?

I never use LABVIEW yet