How to Fade in and Fade Out Led Strip Connected to Arduino Based on Continous Analog Input From Capa

You need to re-think the entire way of dealing with the fading.Instead of saying "The value has changed, fade the LED to that brightness", you need to say "The value has changed. I want the LED to be this brightness." followed by "Is the LED the brightness I want? No? Then move it a bit towards the brightness I want". Something like, in pseudo-code:If that all happens too fast then you need to only run the brightness tests at certain periods. Something like:

1. Control LED strip via serial monitor

You seem to lack the basic understanding, how Serial (UART) communication works. So I will explain the basic principles. From there you should be able to implement, what you want.Serial (aka UART) transmits the data serially, byte after byte (thus it's name). When you type in a text in the Serial Monitor of the Arduino IDE and send it, you have no influence, when exactly each byte will be transmitted. As the UART interface does not know messages or "chunks of data", only bytes, it will transmit each byte, when it is ready. There might be a short pause inbetween the bytes. This is an important fact to know, if you want to implement commands longer than 1 byte.The normal Serial interface is mostly implemented in the Uno's hardware, thus it does not depend on the running software that much. SoftwareSerial does all the hard communication work in software, thus it comes with some caveats (blocking write operations, more limited baudrate, only possible to receive on one SoftwareSerial interface at once, ...). But both mostly share the same code interface.Serial.available() returns the number of received bytes, that are still in the internal buffer. You are already using this to only read from the buffer, when there is actually data to read in it (with the if statement). Then you read one byte from the buffer by Serial.read(). Currently you are giving the return value (the read data) directly to the other serial interface for sending. Thus the value is not saved anywhere in your sketch. Doing a Serial.read() will remove the read byte from the buffer and return it. Thus the read byte will no longer be in the buffer.The code with the 2 if statements and serial functions is mostly used to forward the data between the two serial interfaces. For your use case you do not need this. Instead you should read the data into a local variable like you did in your first sketch:Here you are first checking, if there is data to read in the btSerial buffer. If yes, you read it into the variable a. This variable now holds a single character. If you also want to forward this character to Serial, you can now use Serial.write(a); to do so. Then you want to check the value of the received character. Here we are doing a little excourse:In C/C 2 different kinds of quotes are used: The double quotes " and the single quotes '. Double quotes mark string literals, which consists of a series of characters. Single quotes mark single character values - only one character. In your if statement you check for equality. If you think about it, you see, that checking if 2 single characters are equals is a lot easier, than checking if two strings are equal (checking 1 character on each side versus checking multiple characters on each side). Thus it is a difference, if you compare string literals or single characters. Comparing a single character variable with a string literal does not work - they are two completely different things. Instead you should compare the character variable to a single character:As you are adding more commands for your project, you will see, that if statements do not order the code very good. In this case a switch statement is better:This will execute the corresponding code part depending on the value of a. You can read more about this construct on the web (google something like "C switch").Now you should be able to implement simple 1 byte/character commands in your code. Also review and understand the examples from the Arduino IDE about Serial.If you need more complex commands (maybe with some payload data in addition to the command), you have to introduce a communication protocol onto the Serial interface. The simplest way is to define whole messages by using a delimiter character at the end of every message. Mostly the newline '

' character is used for this purpose. You basically read the data from Serial and save it on a char-array/string until you received the newline character. Then you know, that you have received a complete message, and you can start to process it as a whole. When finished, you clear your message buffer and again wait for a new message. For this to work, you of course have to ensure, that the delimiter character is never part of your send data (as the code would think, that it marks the end of the message).You can see this in the SerialEvent example in the Arduino IDE. Try to understand, what happens there. There are also many tutorials on the web.I hope, I could enlighten you a bit. Good luck with your project.

2. Why constant current led strip can be 20meters?

it have constant currecnt ic,so,can keep the current do not change,so,same brightness from start to the end? i know Starwire can make 10 20 30 50 meters/roll,Michael Chan who send the constant current information with facebook.Why constant current led strip can be 20meters?

3. Will 2 9-volt batteries power an LED strip of 200 LEDs?

With a supply of 18V, only if there are no more than 5 White/Blue, 6 Green or 8 Red, in a series chain, and a suitable limiting resistor in each chain, with a minimum of 150 ohms. More than likely they will not light at all, as these strings are designed for >up to

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