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Fix timing and pin mode change to comply with datasheet.

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W12\owen 2018-09-24 06:20:01 +10:00
parent c978977718
commit b429942ce8
1 changed files with 2 additions and 3 deletions
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DHT.cpp
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@ -153,11 +153,10 @@ boolean DHT::read(bool force) {
// End the start signal by setting data line high for 40 microseconds. // End the start signal by setting data line high for 40 microseconds.
digitalWrite(_pin, HIGH); digitalWrite(_pin, HIGH);
delayMicroseconds(40); pinMode(_pin, INPUT_PULLUP);
// Now start reading the data line to get the value from the DHT sensor. // Now start reading the data line to get the value from the DHT sensor.
pinMode(_pin, INPUT_PULLUP); delayMicroseconds(60); // Delay a bit to let sensor pull data line low.
delayMicroseconds(10); // Delay a bit to let sensor pull data line low.
// First expect a low signal for ~80 microseconds followed by a high signal // First expect a low signal for ~80 microseconds followed by a high signal
// for ~80 microseconds again. // for ~80 microseconds again.