[Masterwriter 2.0 Activation Code
Eliora Shopbell
Trying to use a simulator instead of real hardware, for one thing. Attempting to "combine" things that don't need to be combined may be another. Posting questions in one place and code in another is a another thing you are doing wrong.
PaulS:
Combine them how? You are supposed to run one of them on the master and the other one on the slave. There is nothing to "combine".
Strange definition of "here".
Yes.
Trying to use a simulator instead of real hardware, for one thing. Attempting to "combine" things that don't need to be combined may be another. Posting questions in one place and code in another is a another thing you are doing wrong.
this page has my attempt to make the master send data to a slave, and then that slave sends data to the master. (there are STILL 2 separate pieces of code for the master and the slave)
i dont want to combine the master and the slave code, just the 2 separate pieces of master code and the 2 separate pieces of slave code
I'll provide a little examples with pictures so you ca see the outcome and the little change I made, it cameout weird, it does send the text and then it gets stuck it or frozen and it will only send text 1 time only and I want it to be continiously.
Your last picture shows the intended continuous behavior, because there you read the whole message.
The previous ones only read "all but the last" byte. As mentioned in the code comment.
That's why you get the howMany parameter in your receiveEvent function.
Alternatively you can read all while (Wire.available())
We never transfer variable length readable ASCII data over I2C.
If you pack all the variables in a 'struct' and send the struct over I2C, that will be a lot easier.
An array of variables is even easier than a struct.
There are examples with the Wire library (master_writer / slave_receiver)
And of course @Koepel is right: messages are limited to 32 byte, so variable length texts are not optimal for I2C.
But if this limit is acceptable and there's no need to asynchronously stream "long" text, each I2C transmission can be of different length, if necessary, and can of course contain readable ascii characters, if that's what you really want/need.
A good way of adding complexity of features to your projects without adding complexity of wiring, is to make use of the Inter-integrated circuit (I2C) protocol. The I2C protocol is supported on all Arduino boards. It allows you to connect several peripheral devices, such as sensors, displays, motor drivers, and so on, with only a few wires. Giving you lots of flexibility and speeding up your prototyping, without an abundancy of wires. Keep reading to learn about how it works, how it is implemented into different standards, as well as how to use the Wire Library to build your own I2C devices.
The I2C protocol involves using two lines to send and receive data: a serial clock pin (SCL) that the Arduino Controller board pulses at a regular interval, and a serial data pin (SDA) over which data is sent between the two devices.
As the clock line changes from low to high (known as the rising edge of the clock pulse), a single bit of information is transferred from the board to the I2C device over the SDA line. As the clock line keeps pulsing, more and more bits are sent until a sequence of a 7 or 8 bit address, and a command or data is formed. When this information is sent - bit after bit -, the called upon device executes the request and transmits it's data back - if required - to the board over the same line using the clock signal still generated by the Controller on SCL as timing.
Because the I2C protocol allows for each enabled device to have it's own unique address, and as both controller and peripheral devices to take turns communicating over a single line, it is possible for your Arduino board to communicate (in turn) with many devices, or other boards, while using just two pins of your microcontroller.
But how does the controller and peripherals know where the address, messages, and so on starts and ends? That's what the SCL wire is for. It synchronises the clock of the controller with the devices, ensuring that they all move to the next instruction at the same time.
When delving into the market of breakout modules and sensors, you'll find that there are entire ecosystems, where standards are built around the I2C protocol. Examples of such standards are Qwiic, developed by Sparkfun, and STEMMA QT, developed by Adafruit. Both Qwiic and STEMMA QT use a 4-pin JST SH connector for I2C devices, making it easier for third parties to design hardware with vast compatibility. By having a standardized connector, you'll know that if you see the word Qwiic or STEMMA QT in association with an item, that it will work together with an Arduino board with a Qwiic or STEMMA QT connector, such as the UNO R4 WiFi.
Both Qwiic and STEMMA QT use I2C, and even when inspecting modules using the two standards up close, it may be difficult to tell what makes them unique from each other. But there is a difference! And it has some implications on how and for what you may use them.
Qwiic has level shifting and voltage regulation on the controller (but not on the peripherals). What this means is that Qwiic is 3.3 V logic only. This makes it easier to use, as for the end user, there is one less thing that can go wrong when designing and assembling your circuit.
STEMMA QT, on the other hand, doesn't have this. This lets you use both 3.3 V and 5 V logic for modules. This also means that there is one more thing you may need to consider when creating your circuit, but it also grants some more flexibility in power and logic requirements.
Grove is another connector standard, this one developed by seeed studio. You can find a plethora of modules with a Grove connector, however only some of them use I2C.There are no Arduino boards that have a built in Grove connector, however you can use products such as the MKR connector carrier, Nano Grove Shield, or the Base Shield from the Arduino Sensor Kit to connect Grove sensors to your Arduino board.
When you buy basically any breakout module that makes use of the I2C protocol, they will come with some library that helps you use the sensor. This library is more often than not built on top of the Wire library, and uses it under the hood. Adding functionality in order to make, for example, reading temperature easier.
An example of this is if you want to use Adafruits MCP9808 sensor module, you download the Adafruit_MCP9808 Library from the IDEs library manager, which enables you to use functions such as tempsensor.readTempC() in order to read the sensors temperature data by requesting from the right address, and read the information returned with just a single line instead of writing the Wire code yourself.
In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two boards are programmed to communicate with one another in a Controller Reader/Peripheral Sender configuration via the I2C synchronous serial protocol. Several functions of Arduino's Wire Library are used to accomplish this. Arduino 1, the Controller, is programmed to request, and then read, 6 bytes of data sent from the uniquely addressed Peripheral Arduino. Once that message is received, it can then be viewed in the Arduino Software (IDE) serial monitor window.
In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two boards are programmed to communicate with one another in a Controller Writer/Peripheral Receiver configuration via the I2C synchronous serial protocol. Several functions of Arduino's Wire Library are used to accomplish this. Arduino 1, the Controller, is programmed to send 6 bytes of data every half second to a uniquely addressed Peripheral. Once that message is received, it can then be viewed in the Peripheral board's serial monitor window opened on the USB connected computer running the Arduino Software (IDE).
I2C communication is very popular and broadly used, because of its easy implementation in electronic devices. Reason for I2C easy implementation comes from the fact that only 2 wires are needed for communication, we do need to connect the devices to the common ground as well but the ground is not directly used in the communication.
I2C uses only 2 wires because each device has a unique address assigned to it. Therefore the master can easily know with which slave it communicates. Simply said the signal from the master goes to all of the slaves but only the slave with the correct address is going to react on the signal.
The two wires are: Serial Clock (SLC) and Serial Data (SDA). The SLC is the clock signal which synchronizes the data transfer between devices and it is generated by the master device. The SDA is the data carrier signal, basically the transmission wire.
After we have connected the hardware properly now it is time to start the programing. For enabling the I2C communication we will need WIRE LIBRARAY, which should come with Arduino programing tool by default. In case that is not there you can download it form HERE.
With this "mode" you can only send instructions form the master device to slave, but there is no feedback form the slave device. Because of that you master device has no idea what the slave device is doing. To remedy that there is the second "mode". Below you can see the MasterWriter and the SlaveReceiver.
2. Now we have to register an event that will activate every time that new data is received via I2C. This event we input as a function later in the code. Basically with this line we simply say: call this function (receiveEvent) each time you receive some information from I2C.
6. Now we create a while loop which will go through all of the bytes received but the last one. We will store these bytes inside a character variable, and show them individually on the screen. This will if you remember from the Master code display on the screen (letter by letter) text "x is ".
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