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esp Build:68 with problem
Posted: 18 Jan 2016, 12:05
by vmfs1968
Hello
I am testing the version 68, and with this version gives error with the sensor DHT22
It is always wrong data
sometimes fails to detect the sensor
with previous versions worked well
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 16:37
by BertB
I do not have this problem. Everything works like a charm.
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 17:28
by vmfs1968
because I give, attested in two esp and gives the same problem
there must be something wrong
DHT : Temperature: -8.40
DHT : Humidity: 30.70
DHT : Temperature: 16.80
DHT : Humidity: 61.50
DHT : Temperature: 16.80
DHT : Humidity: 61.50
DHT : Temperature: 16.80
DHT : Humidity: 61.40
DHT : Temperature: 16.80
DHT : Humidity: 61.40
WD : Uptime 337 ConnectFailures 0 FreeMem 25432
DHT : Temperature: 16.80
DHT : Humidity: 61.40
DHT : Temperature: 16.80
DHT : Humidity: 61.40
DHT : Temperature: 16.80
DHT : Humidity: 61.40
DHT : Temperature: 16.80
DHT : Humidity: 61.60
DHT : Temperature: -8.40
DHT : Humidity: 30.70
DHT : Temperature: 16.80
DHT : Humidity: 61.50
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 18:07
by BertB
Is that an actual list?
What is the value of sensor delay in Config?
This is what I have:
DHT : Temperature: 21.50
DHT : Humidity: 31.60
DS : Temperature: 19.19 (28-7e-dc-34-5-0-0-99)
WD : Uptime 1 ConnectFailures 0 FreeMem 26400
WD : Uptime 2 ConnectFailures 0 FreeMem 26400
DHT : Temperature: 21.30
DHT : Humidity: 31.80
DS : Temperature: 19.37 (28-7e-dc-34-5-0-0-99)
WD : Uptime 2 ConnectFailures 0 FreeMem 26384
WD : Uptime 3 ConnectFailures 0 FreeMem 26384
DHT : Temperature: 21.20
DHT : Humidity: 31.90
DS : Temperature: 19.56 (28-7e-dc-34-5-0-0-99)
WD : Uptime 3 ConnectFailures 0 FreeMem 26320
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 21:02
by Martinus
Mine's ok too. Running on R68:
Code: Select all
RX: 8:59:52 PM WD : Uptime 51 ConnectFailures 0 FreeMem 26176
RX: 8:59:52 PM DHT : Temperature: 19.40
RX: 8:59:52 PM DHT : Humidity: 31.40
RX: 8:59:52 PM HTTP : connecting to 192.168.0.8
RX: 8:59:52 PM HTTP : Succes!
RX: 8:59:52 PM HTTP : closing connection
RX: 8:59:52 PM ADC : Analog value: 8
RX: 8:59:53 PM HTTP : connecting to 192.168.0.8
RX: 8:59:53 PM HTTP : Succes!
RX: 8:59:53 PM HTTP : closing connection
RX: 9:00:22 PM WD : Uptime 51 ConnectFailures 0 FreeMem 26176
RX: 9:00:22 PM DHT : Temperature: 19.40
RX: 9:00:22 PM DHT : Humidity: 31.40
RX: 9:00:22 PM HTTP : connecting to 192.168.0.8
RX: 9:00:22 PM HTTP : Succes!
RX: 9:00:22 PM HTTP : closing connection
RX: 9:00:22 PM ADC : Analog value: 7
RX: 9:00:23 PM HTTP : connecting to 192.168.0.8
RX: 9:00:23 PM HTTP : Succes!
RX: 9:00:23 PM HTTP : closing connection
RX: 9:00:52 PM WD : Uptime 52 ConnectFailures 0 FreeMem 26416
RX: 9:00:52 PM DHT : Temperature: 19.30
RX: 9:00:52 PM DHT : Humidity: 31.30
RX: 9:00:52 PM HTTP : connecting to 192.168.0.8
RX: 9:00:52 PM HTTP : Succes!
RX: 9:00:52 PM HTTP : closing connection
RX: 9:00:52 PM ADC : Analog value: 7
RX: 9:00:53 PM HTTP : connecting to 192.168.0.8
RX: 9:00:53 PM HTTP : Succes!
RX: 9:00:53 PM HTTP : closing connection
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 21:21
by CHK_BLN
I have the same problem as VMFS 1968 describes.
it looks as if the measurement is divided by 2
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 21:41
by BobS
Hi, I have seen this problem too.
I think it's caused by timing issues when reading the DHT.
Sometimes an extra bit is read before the actual value this results in a measurement with only half the value.
Maybe this can be corrected by changing the value of the pull-up resistor or using another input.
Looking in the code there is a line with a delay of 40 micros in the function that reads the temperature, this line is commented out.
I did some experiments and for me introducing a delay of 5 microseconds works fine.
Hope this helps.
Re: esp Build:68 with problem
Posted: 18 Jan 2016, 22:17
by vmfs1968
Hello
tou see that there are more people with the same problem
I know that in version 63, this part works well