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51 lines
1.8 KiB
Markdown
51 lines
1.8 KiB
Markdown
---
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title: String Concatenation
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---
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# #28. String Concatenation
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We have already learned how to display readings from our sensors. But if we
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have more than one sensor, we'll need a way to tell the readings apart.
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The `concat` node will help us solve this problem.
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Concat allows you to merge two strings into one. The new string will have the
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input to the left pin placed in the beginning and the input to the right pin
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placed at the end.
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## Test circuit
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[↓ Download as a Fritzing project](./circuit.fzz)
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## How-to
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1. Find the `constant-string` node in the library. Add one per string that
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never change. Alternatively, bind the desired value directly to a `concat`
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pin via Inspector.
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2. Assign string values to each node using the Inspector. Try something like
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“Temp: ” and “Light: ” to keep things short. Put a space at the end
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so that when we combine it with another string they won't bunch up.
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3. Link the `VAL` pins of the `constant-string` nodes to the left pins of the
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`concat` nodes. The `IN1` is the beginning of the line, it’s the first part.
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4. Link the outputs of the thermometer and photoresistor to the right pins on
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the `concat` nodes. They will be the second part of the generated string.
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5. Upload the patch to the Arduino.
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Now, the readings from your sensors are displayed on the screen with a
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convenient label!
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## Try it yourself
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Try to display the measurement label before the reading and the units of
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measurement afterward. Use two more `concat` nodes for this. But remember, you
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only have 16 characters per line.
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Try to convert degrees Celsius to degrees Fahrenheit and label them accordingly.
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You will find a clue for this task in [chapter #14](../14-map-adjust/).
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