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2020-11-10 21:50:28 +03:00
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@@ -6,7 +6,7 @@ Simple thermometer using sound card input and output, a thermistor and couple of
One should assemble components as shown on scheme below: One should assemble components as shown on scheme below:
![Thermometer scheme](https://raw.githubusercontent.com/denis-ftc-denisov/soundthermo/master/scheme.png ![Thermometer scheme](scheme.png)
* Lout should be connected to left channel of sound card output * Lout should be connected to left channel of sound card output
* Rout should be connected to right channel * Rout should be connected to right channel
@@ -35,4 +35,4 @@ where `R1` and `R2` are resistor values. Unfortunately, due to different volumes
really equation is like `Vout = R2 * Vin * k / (R1 + R2)`. So firstly we do measurement via right really equation is like `Vout = R2 * Vin * k / (R1 + R2)`. So firstly we do measurement via right
channel (where we know both `R1` and `R2`), to determine `k`. After that we repeat same measurement channel (where we know both `R1` and `R2`), to determine `k`. After that we repeat same measurement
using left channel. Knowing `Vin`, `Vout`, `R2`, and `k` we can determine value of thermistor. using left channel. Knowing `Vin`, `Vout`, `R2`, and `k` we can determine value of thermistor.
After that we compute real temperature via approximation formula. After that we compute real temperature via approximation formula.