Testing out the PPD42 Air Quality Sensor, with an MSP430 Launchpad and graphing the data with GNUplot.
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#include <stdio.h>
char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
char fmt[20];
sprintf(fmt, "%%%d.%df", width, prec);
sprintf(sout, fmt, val);
return sout;
}