TheCodersCorner.com items tagged with arduino.
Menu library remote connectivity tutorial
TcMenu has considerable out of the box remote connectivity on both Arduino and mbed. With support for Ethernet2 library, UipEthernet library, ESP8266 WiFi, ESP32 WiFi and Serial (including Bluetooth Serial) to name a few connectors. Please pay close attention to the following classes in the reference documentation as they are mentioned frequently here: BaseRemoteServerConnection in reference docs TcMenuRemoteService in reference docs...
Menu control using a matrix keyboard
Using a matrix keyboard with TcMenu is straightforward, we use the IoAbstraction Keyboard Manager component to handle the keyboard, along with a custom listener for tcMenu that feeds the menu manager with appropriate events upon key presses. This library allows you to connect your keyboard either using Arduino pins, or any supported IoAbstraction such as the I2C PCF8574 or MCP23017....
Stabilising an existing Arduino or embedded product
Sometimes the situation arises where a product is built (or gets close to being built), before any concerns about it's stability are discussed or proper planning arranged. Often this leads to code being written without any proper test plan in place. Combined with very tight deadlines there's often even no plan to go back and fix things up. Once this situation...
Arduino Sketch compilation, cost of virtual tables, Wire memory use - part 2
In part 2 of this series we discuss how sketches compile on Arduino, along with the cost of using the virtual keyword to create virtual classes. Some things are not quite as clear cut as may be initially thought, especially in the very low memory environment of the ATMega328 (Arduino Uno). Lastly we discuss the memory usage of Wire and how...
Rotary encoder with non-polling (interrupt based) switches from PCF8574
IoAbstraction has full support for interrupts on most devices, meaning we can connect a Rotary Encoder to an Arduino using a standard PCF8574 IO expander chip. In order to do this we need the PCF8574 /INT line to be connected to an Arduino pin that supports interrupts (such as pins 2 or 3). Further, you can also have handle push...
TcMenu Designer UI - worked example
Worked example: Building a timer For this example we will create a menu that has two top level menu items; a counter which counts down from the selected value, and a Boolean switch that turns on or off the countdown. It will also have a submenu with one menu item to control the notification method. So lets draw this out conceptually...
Arduino single 7 segment analog measurement example
Measuring voltage from an analog input. Following on from the previous example ( example for driving 7 segment LED displays ). we now build on the same circuit to make a simple voltage meter. Additional requirements: Potentiometer of at least 10Kohms . In order to measure voltage, we need to use an Arduino board analog input. Usually these are marked...
Java and Embedded AVR C++ Consulting from TheCodersCorner
I specialise in multithreaded network programming and embedded C++; with in excess of 20 years experience writing applications in both Java and C++. Having spent many years writing systems that need to communicate using differing protocols, often for exchange connectivity we are familiar with many topologies. In terms of multithreaded development we have built systems with low latency requirements using various...
Using menu designer to fully manage your menu structure
This is the traditional way of using tcMenu, where you allow the menu designer to manage your menu structure and round-trip every time new menu items were added. This means that you had to run through designer every time you added a new menu item, which divided opinion, some liked it; others thought that it was a painful process. With the...
PCF8574 / PCF8575 I2C IoExpander for Arduino and mbed
IO Abstraction library fully supports the PCF8574 8-bit and PCF8575 16-bit IO expander chips on Arduino and mbed. It requires only two pins (three for interrupt mode) SDA, SCL, and optionally INT. Our driver integrates the interrupt support for you so you can attach interrupts very easily. The PCF8574 provides 8 additional input or output ports, but there are few limitations...
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We build and maintain an embedded menu designer and framework that works on many platforms.
