Get data from Trend logs!

[phongvucba]

Thank so much! Pro, i will try it ! ):
I have read the link you sent, I have tried the code like this. But it does not give the desired result, can you help me? I want to get these 2 values 2.03 and 1.47kwh
Thank so much everyone !
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require('trends')

-- fetch data for the previous day
dates = {}
dates['start'] = os.date('*t')
dates['start'].day = dates['start'].day - 1
dates['end'] = os.date('*t')
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dates1 = {}
dates1['start'] = os.date('*t')
dates1['start'].day = dates['start'].day - 2
dates1['end'] = os.date('*t')
-- fetch current value
day = trends.fetchone('Đo điện tầng 3', dates)
day1 = trends.fetchone('Đo điện tầng 3', dates1)
grp.write('1/1/1', day)
grp.write('1/1/2', day1)
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