Author Topic: The wireless outdoor thermometer  (Read 942 times)

ejo60

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The wireless outdoor thermometer
« on: September 13, 2014, 06:31:42 AM »
This is what I finished this week, and this data was collected last week:



inside the box it looks like this:



More details are on my blog http://ejo60.wordpress.com/2014/09/13/a-wireless-outdoor-thermometer/.

Update 22-sep: just discovered it is not a wise idea to stick that black piece of anti ESD foam over the FTDI pins because it forms a 5K bridge between Vin and ground. In this way I had a current drain of about 1+ milliamp, and this killed the battery in 350 hours. So I removed the foam and I moved the supply of all NTC and a LDR to a digital pin, something similar is done for the battery voltage monitor. The latest graph at day 16 is here



See also:

 1) http://ejo60.wordpress.com/2014/09/21/day-16/.
 2) http://ejo60.wordpress.com/2014/09/19/outdoor-thermometer-day-14/.
 
Ejo
« Last Edit: September 21, 2014, 10:56:09 PM by ejo60 »