When there's no load, the current value is not null due to the noise.

[Ciusss89]

1. file energy_meter/measure.c
2. When there's no load, the current value is not null due to the noise. As a consequence when we compute the square in the function get_measure the amount error continue growing.

▸       /* !TODO: Remove dc bias, find better solution */                                                                                                                
▸       if(bias_rem)
▸       ▸       val -= BIAS_OFFSET;

#if VERBOSE >= 4
▸       /* WARNING: printf is much time expensive */
▸       printf("adc_measure: val=%d\n", val);
#endif

▸       return val;
}