The Clicker 2 for STM32 is a compact development kit by mikroe (also known as MikroElektronika). This board is equipped with 2 mikroBUS socket that allow to connect the Click Boards. These boards, designed by mikroe, are small add-ons that allow to easily connect most common devices to your MCU. Indeed, in the last years mikroe has produced a lot of Click Boards (more than one hundred) with an extended documentation and with code examples.
During the Maker Faire Rome 2015, we meet some mikroe employee and we have explained them the purposes of PLAY Embedded. Some weeks continue reading...
The joystick proposed here is much known between makers. It provides two axis and a key button and every axis is actually a potentiometer: that means axis data is analogue and we need to use ADC to read its positioning.
Potentiometers are provided of springs so, without forcing, wipers are approximately positioned in the centre of the two resistive elements. As this device is very simple to use, it is not easy find a related datasheet. Indeed, for the most of the applications, it would be useless. Anyway, joystick used in this demo is a very cheap one marked as continue reading...
We have already introduced MAX7219 in STM32, ChibiOS and a 8×8 LED Matrix, so we are going to jump directly to code section. For convenience we just report link to documentation:
Note that even if pins are arranged in a different way, pin-out remains the same of the 8×8 LED matrix.
In this demo we are going to use Code-B decode to write with ease some number on our 8 digit 7-segment display.
In the demo shown in the video above we set up MAX7219 as normal operation mode, Code-B decode mode for each digit, scanning the whole display with the maximum continue reading...
Using Infra-Red for remote control is a technology born in the 70’s and after 40 years it is still used because the good ratio performances-costs and low power consumption. IR remote require a line of sight, because of that latest remote includes bluetooth technology.
Today it is possible to buy a small remote and receiving circuitry spending a few dollars. In Embedded system using IR could be a fast and cheap solution for remote control even if nowadays RF, Bluetooth and WiFi modules are very affordable.
Searching documentation for cheap devices is often not easy at continue reading...
Widely used in sound mixers, the slider can be used as input for many applications. There isn’t so much to say as this device is made by two potentiometers working together. Indeed, when the cursor slides, it changes the position of two side potentiometers.
The slider shown in Fig.1 has six pins:
VCC, (are two connected together) connected to power supply 3.0V DC;
GND, (are two connected together) connection to ground;
OTA, middle pin of potentiometer #1;
OTB, middle pin of potentiometer #2.
We can sample both OTA and OTB making mean to better evaluate slider continue reading...