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fix dht.c error: can't read data from DHT 11 #485

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fix dht.c error: can't read data from DHT 11 #485

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8 changes: 6 additions & 2 deletions gpio/dht_sensor/dht.c
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Original file line number Diff line number Diff line change
Expand Up @@ -48,8 +48,12 @@ void read_from_dht(dht_reading *result) {

gpio_set_dir(DHT_PIN, GPIO_OUT);
gpio_put(DHT_PIN, 0);
sleep_ms(20);
sleep_ms(18);
gpio_put(DHT_PIN,1);
sleep_us(40);

gpio_set_dir(DHT_PIN, GPIO_IN);


#ifdef LED_PIN
gpio_put(LED_PIN, 1);
Expand All @@ -66,7 +70,7 @@ void read_from_dht(dht_reading *result) {

if ((i >= 4) && (i % 2 == 0)) {
data[j / 8] <<= 1;
if (count > 16) data[j / 8] |= 1;
if (count > 35) data[j / 8] |= 1;
j++;
}
}
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