calibrate v0.5 cells at multiple temperatures

[hrldcpr]

We should write down times and temperature readings from the HPD-approved thermometers that correspond to specific times and readings from a few v0.5 cells, at a few different temperatures.

This will allow us to construct a voltage-vs-temperature curve for the v0.5 cells, and to see how consistent readings are between different cells.

(It would be nice to have a few v0.3 cells also involved, because more data is merrier, but that's less crucial.)

[williamcodes]

I'm doing my testing in the office now. It's going to take several hours since it reads hourly but I'll periodically update this comment.

http://relay.heatseeknyc.com/hubs/0013a20040bf9f8d

Version	Extech	Taken At	Cell ID	Temperature	Sleep Period	Received At
v0.3	74.3º	2016-01-11 16:25:20+00:00	0013a20040c17e69	74.39°	359000	2016-01-11 16:25:36.930578+00:00
v0.3	73.9º	2016-01-11 17:25:20+00:00	0013a20040c17e69	73.81°	359000	2016-01-11 17:25:24.022598+00:00
v0.5	71.9º	2016-01-11 21:34:52+00:00	0013a20040dc273e	112.13°	359000	2016-01-11 21:35:00.083369+00:00
v0.3	71.9º	2016-01-11 21:34:51+00:00	0013a20040c17e69	72.06°	359000	2016-01-11 21:34:56.954531+00:00
v0.5	57.2º	2016-01-11 22:34:52+00:00	0013a20040dc273e	117.35°	359000	2016-01-11 22:34:58.803825+00:00
v0.3	57.2º	2016-01-11 22:34:51+00:00	0013a20040c17e69	61.03°	359000	2016-01-11 22:34:55.731795+00:00
v0.5	90.6º	2016-01-11 23:34:51+00:00	0013a20040dc273e	104.58°	359000	2016-01-11 23:34:55.757785+00:00
v0.3	90.6º	2016-01-11 23:34:52+00:00	0013a20040c17e69	86.0°	359000	2016-01-11 23:34:59.023889+00:00

[williamcodes]

I wasn't able to simulate extreme temperatures very well. Without a proper thermal chamber, the best I could do was introduce a heating / cooling element into the box. I used an ice pack and hot water. This introduces a lot of variability within the same zone. @qelloman offered to let us use the thermal chamber at Columbia, hopefully that will improve this data.

[hrldcpr]

Cool thanks! I'll see if I can use this to better calibrate the v0.5 cells when I'm back in NYC at the end of the week.

If you want to do more testing without going up to Columbia, you could just put a cell outside, that would be extreme enough.

[williamcodes]

Man, I can't believe I let this go 15 days, my apologies, we've been totally slammed. Anyway, Noelle was able to get some good readings both on her fire escape and on her desk above her radiator. Here are the numbers:

short code	time	version	temperature
786a	8:30pm	v0.3	44.77
c509	8:30pm	v0.5	127.23
Extech 39240	8:30pm	v0.3	44.2
786a	9:30pm	v0.3	44.19
c509	9:30pm	v0.5	127.81
Extech 39240	9:30pm	v0.3	44.19
786a	11:30pm	v0.3	88.9
c509	11:30pm	v0.5	102.26
Extech 39240	9:30pm	v0.3	88.1