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Author Topic: PulseIn and Nuelectronics ENC28J60 Ethernet Shield  (Read 869 times)
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Hi folks,

I'm currently tinkering with some weather sensors and have found a strange problem when I try to add the ENC28J60 EthernetShield to my setup.

I've the following block to calculate the frequency of the MTF3223 (HS1101) humidity sensor:

long getFrequency(int pin)
  long freq = 0;

  for (unsigned int j = 0; j < FREQUENCY_SAMPLES; j++)
    long f = pulseIn(pin, HIGH, 250000);
    if (f == 0)
      return false;
      freq += 500000 / f;

  return freq / FREQUENCY_SAMPLES;

It works OK on a barebone Uno and 2009, but as soon as I add the enc28j60 shield the reported frequency jumps up approx +1khz  smiley-roll-sweat

This happens even if I don't add / initialize the ethernet library.

The shield is one of these:

Any clues what I'm doing wrong? I'm not using any of the pins that are used by the Shield (2,10,11,12,13)
« Last Edit: March 14, 2011, 12:21:30 pm by Vahan » Logged

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