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July 04, 2010

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Visual Studio Code for Arduino - OTA Programming

My previous post Visual Studio Code for Arduino Basics left me with just one itch unscratched. I'd kind of come to love over-the-air (OTA) programming. My robotics project (using an ESP8266) communicates over WiFi, the "base station" app was all set up and communications using JSON were working perfectly. If I needed to deploy updated robot code I could do it without the hassle of cables. So, does OTA work out of the box with Visual Studio Code? Yes! And no. I wished there was a simple blog post to explain it, so I've had to write it myself. Without further ado ... Hardware Requirements We're assuming here you're using Arduino hardware that has WiFi. Mine is an ESP8266. Whatever hardware you have, I recommend you go back to the basic Arduino IDE and do some OTA programming from there. Just be sure the process works before you add the complexity of Visual Studio Code to the problem. Networking So that we can send code over OTA we have to know the dev

Classes within Classes - Initialiser Lists

There's a problem that crops up over and over when people write object oriented (OO) code for Arduino. When you try to instantiate an object of a class which in turn instantiates an object of another class; things go wildly wrong. The error messages you get are cryptic and, unless you're a fair C++ programmer, useless. An example of when this might be required is this. I'm creating a GPS class to interpret data that comes from a GPS device. To my mind, the GPS object should instantiate its own serial object so it can receive data and do what it wants with it. It shouldn't be the job of the main sketch to go get the serial data and pass it to the GPS object - as would happen if the main sketch instantiated two objects, one for serial, one for GPS. I'm going to do a walk-through on how to get the main sketch to instantiate an object of a class, and as that object is being created , let the new object create its own object of a different class. Have a look at my last p

Building DateTime for Arduino

Testing. Yup, testing. With this class it can’t be avoided. Actually, even better, instead of seeing testing as a chore, let’s use it to our advantage. We’ll build a suite of tests for the unfinished DateTime class and test it until it works. The goal here is to write all the tests first and run them. Some percentage of them will fail. Then we modify the DateTime class until all tests pass. As we find issues along the way, we add more tests. Get code here: https://github.com/prawnhead/ArduinoDateTime

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