24 lines
2.0 KiB
HTML
24 lines
2.0 KiB
HTML
define(`TITLE', `Integrated Thermometer and Timer')
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define(`DATE', `2016-09-09')
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define(`CONTENT', `
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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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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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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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I used a MSP430G2553 with 10bit-ADCs, a PT1000 sensor and two seven-segment LED displays.
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The code is available at <a href="https://bitbucket.org/wollud1969/teathermotimer" target="_blank">https://bitbucket.org/wollud1969/teathermotimer</a>.
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<a href="http://a385e5.files.wordpress.com/2016/09/img_0813-e1473432862286.jpg" rel="attachment wp-att-720"><img src="http://a385e-5.de/wp-content/uploads/IMG_0813-e1473432862286-768x1024.jpg" alt="img_0813" width="474" height="632" class="alignnone size-large wp-image-720" /></a>
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<a href="http://a385e5.files.wordpress.com/2016/09/img_0814.jpg" rel="attachment wp-att-721"><img src="http://a385e-5.de/wp-content/uploads/IMG_0814-1024x768.jpg" alt="img_0814" width="474" height="356" class="alignnone size-large wp-image-721" /></a>
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<a href="http://a385e-5.de/wp-content/uploads/IMG_0815.jpg" rel="attachment wp-att-722"><img src="http://a385e-5.de/wp-content/uploads/IMG_0815-1024x768.jpg" alt="img_0815" width="474" height="356" class="alignnone size-large wp-image-722" /></a>
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Schematics: <a href="http://a385e5.files.wordpress.com/2016/09/201609091558_0001.pdf">201609091558_0001</a>
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Calculation for measurement: <a href="http://a385e5.files.wordpress.com/2016/09/201609091558_0002.pdf">201609091558_0002</a>
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