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Showing results for tags 'Air humidity alarm'.
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I decided to build an air humidity alarm so I know when to air (you can also attach a piezo buzzer, which is more recognizable in some situations). I found/use this lib. Chip: MSP430G2452 (this I had left, I think it's overkill for this task) -- Problem solved. Thanks to all who helped. To solve the problem I decided to comment out if (millis() < _lastMillis) { return _lastResult; // return last correct measurement } _lastMillis = millis() + 1; in DHT22_430.cpp because I think the millis() doesn't run below LPM1. I also don't need the millis() because I already wait in interrupts (3-10 seconds, enough for this sensor which needs at least 1-2 seconds time). I also commented out "delay(250);" and changed "delay(20);" to "delay(10);" to reduce unnecessary power consuming cycles. Tested and works. BTW: don't forget to comment out "#define DEBUG" in DHT22_430.h (but it will give you a compile error anyway when using timer ("multiple definition of `__isr_9'")). That's it, no further changes (if I would have made many small changes to the lib, I'd have attached the two lib files in an archive file). -- Power consumption: In LPM3: 10
