Noise rpi — Volkswagen Pointer Variant II

20 Июн 2015 | Author: | Комментарии к записи Noise rpi — Volkswagen Pointer Variant II отключены
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Raspberry Pi: Sous-vide with the Wolfram Language

post was syndicated from: Pi and was written by: Liz Upton. Original at Raspberry Pi

Here’s another post from Allison at Wolfram Research. We’ve sous vide applications – but we’ve never seen one uses the Wolfram Language and to describe elegant curves it prepares your dinner. Allison, and thanks to Diego who came up with this

Diego Zviovich, another one of our power-users of Mathematica and the Wolfram on the Raspberry Pi, has managed to (affordably) the science of sous-vide cooking!

For those who aren’t familiar, vide is a modern cooking where the food is first put airtight bags and then in a water bath at a very temperature. The result is perfect, cooked meat or fish, much greater penetration of from any marinade you might be Actual sous-vide cookers hundreds (or thousands) of dollars to but with a few sensors, a crock and your Raspberry Pi with installed, you can create your own sous vide at a fraction of the

What you’ll need with your Raspberry Pi +

The 5V 2-relay control module be used to control the power to the pot. We’ll be automating switch to turn on and off depending on our readings, maintaining the appropriate temperature that we want. A for setting up a circuit and connecting the from your crock pot to RPiPi can be found in this YouTube tutorial .

Once set up, turning the crock pot on and off the Wolfram Language is very To turn it on:

And to turn it off:

In to get the temperature readings using we’ll need to set up an analog-to-digital the GPIO on the RPi does not have pins. A wiring diagram for the can be found here .

We’ll only be using two of the analog sensors for our two thermocouples for the water bath and one for the food They must be connected to the CH0 and CH1 of the MCP3008 in the following way:

you’ve decided at what you want to cook your you can conduct a simple experiment to the ideal fixed resistance that you will need to maintain it. Using your a regular thermometer, a voltmeter, and glasses of water—one iced, one and one hot—take three temperature and three resistance measurements from each glass of and fit the data to a curve using

Using Diego’s data as an

The model above fits well (R^2=.998), so we can use the curve to the expected resistance at our desired For this example, let’s say 60 Celsius.

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From these using a 56K resistor for the thermocouples provide the appropriate temperature we need.

To read the temperature from the thermocouples, we will to probe the analog inputs the MCP3008 through the GPIO. We develop a function to do this, two libraries — gpio.h and mcp3008.h — can be downloaded here. along the script gpio.sh to export the pins to sys/class/gpio. Put the library into the directory /usr/include. sure to run:

after the installation. With libraries installed, we can now build a to get the temperature values using The two files will be as follows:

adc.c

Compile the files by

And now we can open up the Wolfram Engine or and build the sous-vide program!

out Diego giving a demo of the and relay controller!


Also, if thermocouples aren’t thing, you can alternatively get your readings using a waterproof temperature sensor and following lovely setup tutorial by

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