I want to accumulate rain for the day, month and year; What formula can I use?

[Davidlo3820]

I want to accumulate rain for the day, month and year; What formula or expression can I use.

I am using a Rain Wise product that converts pulses to an analog value.  The Rain Wise device can be

set to measure up to 1", 5", or 10".  I will be setting the unit to 10 inches in increments of 0.01 inches.

What I would like to do is everytime the signal increments I would like to count it as 0.01 then after reaching

a period of time whether it be a day or a month reset back to zero.

Need some advise on this problem.

[Ryan.S]

What kind of signal does the lookout get?

If it's a pulse, you can use the Accumulator object. Its input is 0.01, Sample equals that pulse, and use a TimeofDay, TimeofWeek or TimeOfMonth object to reset the Accumulator.

[Davidlo3820]

Hello Ryan,

Lookout gets a Modbus over Ethernet signal which originates as a 4-20mA input to a Moxa Ethernet I/O Module (E1240) in the field.  In Lookout I created a ModbusEthernet Driver and a tag which scales 0 - 65534 RAW to 0-10 Eng.  [0 - 10 is inches of rain]  Also, another piece of information is that after the rain gauge maxes out at 10 inches it will zero out and start over.

I though the accumulator was time based and took a sample over a specific time period, for instance, one sample every 30 seconds then accumulate.  If this is so then if I have 5 inches of rain and then it stopped raining, then 30 seconds latter it would sample, it would see 5 inches and add that to be 10 inches when actually it had only rained 5 inches. 

I really need some help with this process,

David Lopez

City of Corpus Christi

[Ryan.S · Accepted solution]

How about using a Counter to count the number of times that the signal is below than 0.01?

For example,

Counter.Count = signal <= 0.01

The total number of rain is

Counter * 10 + signal

Use TimeOfDay or TimeOfWeek to reset the counter.