Suga koubou / Mbed 2 deprecated Wattmeter_sample

AC current sensor

Dependencies:   mbed

main.cpp@0:08313411c8a1, 2011-01-16 (annotated)

Committer:
okini3939
Date:
Sun Jan 16 03:09:47 2011 +0000
Revision:
0:08313411c8a1

        

        
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#include "mbed.h"





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#include <math.h>





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Ticker ticker;





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volatile long val;





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volatile int offset, count;





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DigitalOut myled(LED1);





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AnalogIn adc_offset(p15), adc_watt1(p16), adc_watt3(p18);





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Serial pc(USBTX, USBRX); 





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void sample_watt () {





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    int i;





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    i = ((adc_watt3.read_u16() >> 4) & 0x0fff) - offset;





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    if (i < -1 || i > 1) {





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        val = val + (i * i);





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    }





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    count ++;





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}





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int main() {





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    float v, f, g;





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    offset = (adc_offset.read_u16() >> 4) & 0x0fff;





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    val = 0;





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    count = 0;





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    ticker.attach_us(&sample_watt, 100); // 10kHz





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    pc.printf("begin\r\n");





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    while(1) {





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        if (count >= 10000) {





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            myled = 1;





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            // RMS





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            __disable_irq();





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            v = sqrt((float)val / count) * (3.3 / 0x1000);





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            f = v / (0.99 * 330.0 / 3000.0);





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            val = 0;





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            count = 0;





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            g = ((adc_watt1.read_u16() >> 4) & 0x0fff) - offset;





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            g = g * (3.3 / 0x1000);





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            g = g / (0.99 * 330.0 / 3000.0); 





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            offset = (adc_offset.read_u16() >> 4) & 0x0fff;





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            __enable_irq();





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            pc.printf("%.2f A ave , ", g);





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            pc.printf("%.2f A rms\r\n", f);





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            myled = 0;





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        }





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    }





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}