Fix repeat readings from DHT11 #1
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Reset the I/O pin to high and record, using pigpio 1.2+ getTick() function, the start of the new measurement period for later comparison.
This was referenced Nov 25, 2018
|
@depuits Possible to merge this and issue a new package? I'm using this in a project and would like to get official packages. |
|
I'll test it this weekend but it looks good. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Update to pigpio version 1.2.0 containing new getTick() and tickDiff() functions, and use those functions to fix a problem with reading the sensor repeatedly. Ensure the DHT11 data pin is set high when still in output mode before switching to input mode, to ensure the sensor can see the difference in voltage from reading to reading, and track the baseline start tick value from that voltage change.
This fix is working in a DHT11 based sensor project that reads the sensor once per minute for multiple days in a row successfully.