The mikromedia for PIC24 is a compact development system with lots of on-board peripherals which allow development of hand-held devices with multimedia content. The central part of the system is the 16-bit Microchip PIC24FJ256GB110 microcontroller. The mikromedia for PIC24 features integrated modules such as stereo MP3 codec, TFT 320×240 touch screen display, accelerometer, USB connector, audio connector, MMC/SD card slot, 8 Mbit Flash memory, and more. The board features a front-facing reset button, battery charger circuit for Li-Polymer batteries, crystal oscillator, and connection pads for all other available pins. It is compatible with all mikromedia shields (see options below) and can be plugged directly into the mikromedia WorkStation.
A color user manual and code examples are included. The board comes pre-programmed with a USB bootloader, so you won't have to spend a penny more on external programmers. If you do want to, pins pads are available for using a mikroProg for PIC or ICD2/3 (with adapter).
All unused microcontroller pins are available via pads along the sides of the board. The board measures 81.2 × 60.5 mm (3.19 × 2.38 inches).
PIC24 Multimedia Board Features
PIC24FJ256GB110 microcontroller This high-performance 16-bit microcontroller with its integrated modules in combination with the on-board modules is ideal for multimedia applications.
- Up to 16 MIPS operation
- 8 MHz internal oscillator
- 256KB of program memory
- 16,384 Bytes of RAM
- 80 I/O pins
- 4x UART, 3x SPI, 3x I2C
- Max. I2C speed 400 kHz
- CPU operating voltage 2V to 3.6V
- nanoWatt features
- Flexible addressing modes
USB power supply You can apply power to the board using the provided mini-B USB cable. An on-board voltage regulator will provide the appropriate voltage levels to each part of the board. The Power LED will indicate the presence of power supply.
Battery power supply You can also power the board using a Li-Polymer battery via the on-board Molex 5264 battery connector. An MCP73832 battery charger circuit enables you to charge the battery over USB connection. A red LED indicates when the battery is charging. Charging current is ~250mA and charging voltage is 4.2V DC.
Programming with bootloader For programming the microcontroller, you can use a bootloader program which is pre-installed in the device. To transfer a .hex file from a PC to the MCU, you can use the free mikroBootloader application. The board has a mini-USB connector and ships with a cable to connect to your PC.
Programming with external programmer/debugger In case you want to remove the USB bootloader, need to re-install it, or want to perform in-circuit debugging, the microcontroller can be programmed with an external in-circuit programmer/debugger (not included). The board has pads for installing programming headers compatible with the mikroProg for PIC or the ICD2 Connector Board.
microSD Card Slot The board contains a microSD card slot for using microSD cards in your projects. It enables you to store large amounts of data externally, thus saving microcontroller memory. microSD cards use Serial Peripheral Interface (SPI) for communication with the microcontroller. Max. microSD I2C speed is 16 MHz.
Flash Memory The M25P80 Flash memory module enables the microcontroller to use an additional 8Mbits of Flash memory. It is connected to the microcontroller via the Serial Peripheral Interface (SPI). Max. serial Flash SPI speed is 16 MHz.
LCD with Touch Screen The development system features a TFT 320×240 display covered with a resistive touch panel. Together they form a functional unit called a touch screen. It enables data to be entered and displayed at the same time. Current consumption with backlight on is 56.2 mA (backlight current 42 mA). The TFT display is capable of showing data in 262,000 different colors. A stylus is sold separately; see the options below.
Audio Module mikromedia for PIC24 features a VS1053 audio controller. This module enables audio reproduction by using stereo headphones connected to the system via the 3.5mm connector CN2. All functions of this module are controlled by the microcontroller over Serial Peripheral Interface (SPI). Max. audio codec SPI speed is 2 MHz.
USB Connection The PIC24FJ256GB110 has an integrated USB OTG module which enables you to implement USB communication functionality on the mikromedia board. Connection to a target USB host is achieved with a mini-B USB connector.
Accelerometer The on-board ADXL345 accelerometer can be used to measure acceleration in three axes: x, y, and z. The accelerometer's function is defined by the program loaded into the microcontroller. Communication between the accelerometer and the microcontroller is performed via the I2C interface. You can set the accelerometer address to 0 or 1 by re-soldering the SMD jumper (zero-ohm resistor) to the appropriate position. This jumper is placed in address 1 position by default.
Crystal Oscillator The board is equipped with an 8 MHz crystal oscillator circuit that provides an external clock waveform to the microcontroller's OSC pins. This base frequency is suitable for further clock multipliers and ideal for generation of the necessary USB clock, which ensures proper operation of the bootloader and your custom USB-based applications.
Reset Button The board is equipped with a reset button on the LCD side so it can be available to the user if the mikromedia board is placed in an enclosure. The other side of the board has pads for installing a second reset button if needed.
Software Examples The code example ZIP file that you can download below contains the following example software, both as ready-to-load compiled code and as source code written in mikroC, mikroBASIC and mikroPascal. The source codes provide detailed explanatory comments.
- Demonstration of ADXL345 three-axis accelerometer. Values from accelerometer are sent to PC via USB-UART.
- Simple battery charger demo.
- Demonstration of Touch Panel. Creates a simple calculator.
- Demonstration of microSD card slot and MMC FAT16 library. Read and write to card and observe results via USART.
- Demonstration of communicating with VS1053 codec. Reads MP3 file from MMC and sends it to VS1053E for decoding and playback.
- Demonstration of M25P80 Serial Flash. Connects via SPI, writes a byte and an array of bytes, then reads them back.
- Demonstration of TFT LCD. Displays a picture.
- Demonstration of UART libraries. Creates a loopback interface, echoing back any message sent to it.
- Demonstration of USB interface. Creates an HID interface to PC, and echoes back characters sent from HID terminal.
- mikromedia for PIC24 Board with touchscreen LCD
- mini-USB cable
- Printed documentation
PIC24 Multimedia Board Resources
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