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Are you trying to send integers over serial using parseInt with Arduino?
Maybe you’re struggling to understand the difference between Serial.read() and Serial.parseInt(), and how they can work for you? Do you just need to know how to convert multiple digit char to integers?
Then you’re in luck! In this lesson you will learn exactly how to use parseInt from the Arduino Serial library to convert multiple characters to a single integer. Get ready!
OVERVIEW
Let’s do a quick overview of what we’ll cover.
A quick overview of Serial Communication
Serial.read() vs Serial.parseInt()
Code for converting chars to integers with parseInt()
parseInt() details, like setTimeOut(), Lookahead Mode, and ignore
Quick Serial Communication Review
If you watched our lesson on using serial.read(), then you already know how to take serial input and convert the chars to integers by putting all the incoming bytes into a char array. If you want to learn that method, make sure to check out the lesson on Serial.read().
That code worked great, but it was somewhat lengthy. In this lesson we are going to talk about using a function from the Serial library called parseInt().
Let’s do a quick review of how serial communication works with Arduino.
You Arduino has some hardware on it called a USART/UART that will allow you to receive data serially from a computer. It will store that data in a buffer called the serial receive buffer.
WHAT’S A BUFFER?
Now if the word buffer throws you off - don’t sweat it. You can think of a buffer like a bunch of horse stalls in a stable. Some stables are big and have a bunch of stalls - you can house a bunch of horses there, other stables are quite small, and you only have room for so many horses - you can’t take in more horses than you have stalls!
A buffer is like a stable, but instead of having horse stalls, it has spaces in memory where data can be stored.
Generally speaking, a buffer is a transient place for data storage in a program. Usually, you are receiving data into a buffer, and then reading it out pretty quickly - because more data will be coming in and you need to make space for it. This is not some hard and fast rule though.
The serial receive buffer has room for 64 bytes. When data comes to your Arduino over Serial, each byte will end up in the serial receive buffer.
It’s your job as the programmer to read the data out of the serial receive buffer and do something with the data.
But how do you do that? Turns out there are quite a few ways!
1 июл 2021
