40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
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<!-- { "title": "Integrated Thermometer and Timer" } -->
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<h1>#title#</h1>
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<p>
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To brew green tea you need water of about 75°C. To know that your water has 100°C is easy, you can see that it is boiling. For 75°C you need a thermometer. Then you also need to take care about the brewing time. It should be usually two minutes.
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</p>
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<p>
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There are such integrated thermometer and timer things on Amazon, but that's not me cup of tea, I decided to build one on my own. It should run on batteries, it should be small and it should make no noise (for office use).
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</p>
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<p>
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In between I was reading "Patterns for Time-Triggered Embedded Systems" from Michael Pont. And afterwards I was curious to use such a simple cooperative scheduler instead of the super-loop, as it is common in the Arduino domain.
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</p>
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<p>
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I used a MSP430G2553 with 10bit-ADCs, a PT1000 sensor and two seven-segment LED displays.
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</p>
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<p>
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The code is available at <s><a href="https://bitbucket.org/wollud1969/teathermotimer" target="_blank">https://bitbucket.org/wollud1969/teathermotimer</a></s> <a href="https://gitlab.com/wolutator/TeaThermoTimer">https://gitlab.com/wolutator/TeaThermoTimer</a>.
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</p>
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<p>
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<a href="files/img_0813-e1473432862286.jpg"><img src="files/img_0813-e1473432862286_small.jpg"/></a>
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</p>
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<p>
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<a href="files/img_0814.jpg"><img src="files/img_0814_small.jpg" /></a>
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</p>
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<p>
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Schematics:<br/>
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<a href="files/201609091558_0001.pdf">201609091558_0001</a>
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</p>
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<p>
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Calculation for measurement:<br/>
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<a href="files/201609091558_0002.pdf">201609091558_0002</a>
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</p>
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