Talk:Chest Freezer To Refrigerator Conversion: Difference between revisions
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(Created page with "=math= What temperature should a refrigerator be? The FDA recommends between 32°F and 40°F (0°C to 4°C). Energy Star recommends between 35°F and 38°F (2°C to 3°C) to...") |
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| Line 7: | Line 7: | ||
thermister = | thermister = | ||
10K Ohm @ 25 celcius | :10K Ohm @ 25 celcius | ||
20.13 @ 5 | :20.13 @ 5 | ||
24.30 @ 0 | :24.30 @ 0 | ||
==voltage devider== | ==voltage devider== | ||
| Line 15: | Line 15: | ||
Vout = (R2/(R1+R2)) x Vin | Vout = (R2/(R1+R2)) x Vin | ||
24.3 Ohm -> 0.962V | :24.3 Ohm -> 0.962V | ||
24 Ohm -> 0.97V | :24 Ohm -> 0.97V | ||
21 Ohm -> 1.06V | :21 Ohm -> 1.06V | ||
==Analog to Digital Converter== | ==Analog to Digital Converter== | ||
| Line 25: | Line 25: | ||
so on a 3.3V arduino, analogRead(A1) will equal | so on a 3.3V arduino, analogRead(A1) will equal | ||
0V = 0 reading | :0V = 0 reading | ||
1.65 = 511 | :1.65 = 511 | ||
3.3V = 1023 | :3.3V = 1023 | ||
so | so | ||
24.3 Ohm = 298.25 | :24.3 Ohm = 298.25 | ||
24 Ohm = 300.88 | :24 Ohm = 300.88 | ||
21 Ohm = 329.99 | :21 Ohm = 329.99 | ||
Revision as of 00:59, 9 November 2016
math
What temperature should a refrigerator be? The FDA recommends between 32°F and 40°F (0°C to 4°C). Energy Star recommends between 35°F and 38°F (2°C to 3°C) to reduce energy use.
thermister =
- 10K Ohm @ 25 celcius
- 20.13 @ 5
- 24.30 @ 0
voltage devider
Vout = (R2/(R1+R2)) x Vin
- 24.3 Ohm -> 0.962V
- 24 Ohm -> 0.97V
- 21 Ohm -> 1.06V
Analog to Digital Converter
Arduino's onboard ADC converts voltage to a range of 0-1023 based on arduino's base voltage
so on a 3.3V arduino, analogRead(A1) will equal
- 0V = 0 reading
- 1.65 = 511
- 3.3V = 1023
so
- 24.3 Ohm = 298.25
- 24 Ohm = 300.88
- 21 Ohm = 329.99