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DHT22 with proteus.

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I made this changes in the library to make it works with DHT22 sensor in proteus.
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MaxGracia98 2020-04-15 12:02:00 -05:00 committed by GitHub
parent 428e115b57
commit e384d4aec6
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1 changed files with 15 additions and 0 deletions
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15
DHT.cpp
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@ -81,6 +81,7 @@ void DHT::begin(uint8_t usec) {
*/ */
float DHT::readTemperature(bool S, bool force) { float DHT::readTemperature(bool S, bool force) {
float f = NAN; float f = NAN;
float a,b;
if (read(force)) { if (read(force)) {
switch (_type) { switch (_type) {
@ -105,6 +106,13 @@ float DHT::readTemperature(bool S, bool force) {
} }
break; break;
case DHT22: case DHT22:
a = data[2]<<8;
b = data[3];
f = (a + b)/10;
if (S) {
f = convertCtoF(f);
}
break;
case DHT21: case DHT21:
f = ((word)(data[2] & 0x7F)) << 8 | data[3]; f = ((word)(data[2] & 0x7F)) << 8 | data[3];
f *= 0.1; f *= 0.1;
@ -144,6 +152,7 @@ float DHT::convertFtoC(float f) { return (f - 32) * 0.55555; }
*/ */
float DHT::readHumidity(bool force) { float DHT::readHumidity(bool force) {
float f = NAN; float f = NAN;
float a,b;
if (read(force)) { if (read(force)) {
switch (_type) { switch (_type) {
case DHT11: case DHT11:
@ -151,6 +160,10 @@ float DHT::readHumidity(bool force) {
f = data[0] + data[1] * 0.1; f = data[0] + data[1] * 0.1;
break; break;
case DHT22: case DHT22:
a = data[0]<<8;
b = data[1];
f = (a + b)/10;
break;
case DHT21: case DHT21:
f = ((word)data[0]) << 8 | data[1]; f = ((word)data[0]) << 8 | data[1];
f *= 0.1; f *= 0.1;
@ -254,6 +267,8 @@ bool DHT::read(bool force) {
digitalWrite(_pin, LOW); digitalWrite(_pin, LOW);
switch (_type) { switch (_type) {
case DHT22: case DHT22:
delay(20); // data sheet says at least 18ms, 20ms just to be safe
break;
case DHT21: case DHT21:
delayMicroseconds(1100); // data sheet says "at least 1ms" delayMicroseconds(1100); // data sheet says "at least 1ms"
break; break;