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    <p>The large code block is the code for the measure() function. Notice that it returns 0 at one point without performing a connReset(). This should be a way to detect a valid device such as ... </p> <pre><code>bool hasHUMI; if (hsensor2.measure(SHT21::HUMI)) { hasHUMI=true; } </code></pre> <p>or</p> <pre><code>if (hsensor2.measure(SHT21::HUMI) &amp;&amp; hsensor2.measure(SHT21::TEMP)) { hsensor2.calculate(h, t); float hum2 = (h); float temp2 = (t); } </code></pre> <p>or</p> <p>Your code should be clearing h and t to 0 before making the read so that you can test for valid values. Like this...</p> <pre><code>void loop() { h=0.00f; t=0.00f; // Get data from sensor soft I²C hsensor2.measure(SHT21::HUMI); hsensor2.measure(SHT21::TEMP); hsensor2.calculate(h, t); float hum2 = (h); float temp2 = (t); if (h&gt;0) { } if (t&gt;0) { } } </code></pre> <p>If not then you could make (copy) your own version of the <code>measure()</code> function that tests for valid return value in <code>meas[type]</code>. You would need to set <code>meas[type]</code> to a known invalid value before the read (such as <code>0</code>).</p> <pre><code>uint8_t SHT21::measure(uint8_t type, void (*delayFun)()) { start(); writeByte(type == TEMP? MEASURE_TEMP : MEASURE_HUMI) for (uint8_t i = 0; i &lt; 250; ++i) { if (!digiRead()) { meas[type] = readByte(1) &lt;&lt; 8; meas[type] |= readByte(1); uint8_t flipped = 0; for (uint8_t j = 0x80; j != 0; j &gt;&gt;= 1) { flipped &gt;&gt;= 1; } if (readByte(0) != flipped) break; return 0; } if (delayFun) delayFun(); else delay(1); } connReset(); return 1; } </code></pre> <p>You probably know that if you add a method to a library cpp then you also need to add a corresponding prototype to the .h otherwise the arduino will fail to compile your code.</p> <p>.cpp</p> <pre><code>uint8_t SHT21::measureTest(uint8_t type, void (*delayFun)()) { } </code></pre> <p>.h</p> <pre><code>uint8_t measureTest(uint8_t type, void (*delayFun)() =0); </code></pre>
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