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IR Remote and STM32 using ChibiOS

IR Remote and STM32 using ChibiOS

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...

Reading a Slider

Reading a Slider

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...

STM32, ChibiOS and a 8×8 LED Matrix

STM32, ChibiOS and 8x8 LED Matrix

The MAX7219 is a compact, serial input/parallel output common-cathode display driver. Included on-chip there are a BCD code-B decoder, the multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor is required to set the segments current.

This chip is often used to drive 7-segment display having up to 8 digits or up to 64 individual LEDs. It is not unusual find this chip in DIY kits to be mounted on a small PCBs like that used in this article (See Fig. 1).

This chip could be found in different packages continue reading...

A Radio Frequency transceiver library: nRF24L01 and ChibiOS/RT

A Radio Frequency transceiver library nRF24L01 and ChibiOS/RT

The nRF24L01 is one of the most popular RF transceiver as it is very cheap and it could be found already configured on small PCBs with needed passive components. This means that only a MCU is needed to design a radio system with the nRF24L01.

The nRF24L01 is a highly integrated, ultra low power 2Mbps RF transceiver IC for the 2.4GHz ISM band. It provides an hardware protocol accelerator, the Enhanced ShockBurst, enabling the implementation of advanced and robust wireless connectivity with low cost MCUs.

By this article we want to provide a full library for nRF24L01 continue reading...

How to use an HD44780 based Liquid Crystal Display

How to use an HD44780 based Liquid Crystal Display

The HD44780 is a controller for display developed by Hitachi commonly used to manage alphanumeric dot matrix LCD. This controller is a standard de-facto for this kind of display. It is often used in industrial test equipment, networking equipment, vending machine and in embedded projects.

Compatible LCD screens are manufactured in several standard configurations. Common sizes are one row of eight characters (1×8), as well as 16×2, 20×2 and 20×4 formats. Larger custom sizes are made with 32, 40 and 80 characters and with 1, 2, 4 or 8 lines. The most commonly manufactured continue reading...