Wind Instrument problem (DS2423)

[misho]

Very strange problem .. When all is power all work fine, but when loss power and connect again .. and read DS2423 show 0

On website http://www.aagelectronica.com/aag/en-us/p_1.html is written " (batteries not included , AND NOT NEEDED !!!!!)."

... then i must connect one battery (3V) but this operations is very complexity, because this sensor is mounted high on roof .. and ...

Any ideas ?

Thanks in advance !

 

[ericvic]

Very strange problem .. When all is power all work fine, but when loss power and connect again .. and read DS2423 show 0

On website http://www.aagelectronica.com/aag/en-us/p_1.html is written " (batteries not included , AND NOT NEEDED !!!!!)."

... then i must connect one battery (3V) but this operations is very complexity, because this sensor is mounted high on roof .. and ...

Any ideas ?

Thanks in advance !

It is true that the DS2423 will reset if it loses power but for wind speed it doesn't matter. When calculating wind speed you should take two readings about 1 second apart and then subtract the two readings to determine how many counts happened in that time frame. If somehow the power goes out in between the two readings then you would get a bad reading that your software would need to handle.

Eric

 

[misho]

Yes, i know but when i put my readings into MySQL .. What will happed ? If Last read is 8522 and after power loss is 154 .. Then ... will show - .. U can see this in http://meteo.zlatograd.com .... May be i will put anywhere on line one battery for DS2423 ..

 

[huggy59]

It doesn't matter where you store the reading. The software that interprets the readings will show a negative result and therefore should ignore the readings for that cycle. Even if you put batteries on it, eventually the integer count will roll over to 0 (due to limitations) and you'll have the same problem for one set of readings.

 

[Clark Martin]

Yes, i know but when i put my readings into MySQL .. What will happed ? If Last read is 8522 and after power loss is 154 .. Then ... will show - .. U can see this in http://meteo.zlatograd.com .... May be i will put anywhere on line one battery for DS2423 ..

You need to determine the maximum difference in count to be expected in normal use. Then add a tolerance factor (10% say). Then if a pair of samples differs by more than this amount ignore this data and try again.

As Eric said you don't need a battery for wind speed. If you put one in then you are just going to have to replace it at some point.

Besides, if your bus looses power between two samples then you probably need to retry it anyway.

 

[ericvic]

Yes, i know but when i put my readings into MySQL .. What will happed ? If Last read is 8522 and after power loss is 154 .. Then ... will show - .. U can see this in http://meteo.zlatograd.com .... May be i will put anywhere on line one battery for DS2423 ..

I would not put the absolute readings in the database. I would put the difference between two readings or the calculated windspeed.

Eric