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Increase pull down time for DHT22 sensor to 2.5ms #113

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@Sly1024 Sly1024 commented Jul 14, 2020

Based on this comment for DHT11: #67 (comment)
And this datasheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf#page=6
I tried 1ms (1000 us) pull down time, but it was not enough. A 2ms (2000 us) time seemed to be OK, but to be on the safe side I set this to 2.5ms (2500 us).

Based on this comment for DHT11: momenso#67 (comment)
And this datasheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf#page=6
I tried 1ms (1000 us) pull down time, but it was not enough. A 2ms (2000 us) time seemed to be OK, but to be on the safe side I set this to 2.5ms (2500 us).
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