PICado Alpha 2

Hardware Detail
Processor (PIC18F8722)
On the PICado Alpha 2 Development Board it has the ability to install different Microcontrollers.
The default Microcontroller is the PIC18F8722.
It can also be used without hardware changes following devices:

• PIC18LF8722
• PIC18F8723
• PIC18LF8723

For use of 3.3V devices as follows, you will see in the User Guide

• PIC18(L)F87k22
• PIC18(L)F87k23

Bluetooth Module HC-05
HC-05 embedded Bluetooth serial communication module has two work modes: order-response work mode and automatic connection work mode. And there are three work roles (Master, Slave and Loopback) at the automatic connection work mode. When the module is at the automatic connection work mode, it will follow the default way set lastly to transmit the data automatically. When the module is at the order-response work mode, user can send the AT command to the module to set the control parameters and sent control order.

Four FET power output stage
Four IRFML8244TRPBF N-channel FET used as power output stage.
The power output stages can switch up to 2.5A each. (Absolute Maximum Rating = 3A )

For details see the datasheet and schematic.

Switch
The switches provide the following functions:

• S1 – MCLR to hard reset the processor
• S2 – connected to microcontroller pin RD3
• S3 – connected to microcontroller pin RD2

Switch S1 has debounce capacitors. When pressed, the switch is grounded. When idle, he is pulled high (+5V).
Switch S2 and S3 has no debounce capacitors. When pressed, the switch is grounded. When idle, he is pulled high (+5V).
For details see the datasheet and schematic.

LEDs
Four CGKCH005 LEDs, 2 connected to the Microcontroller and 2 connected to the HC-05 Bluetooth Module.
Another CGKCH005 LED shows the power Status of the whole board.

For details see the datasheet and schematic.
Voltage Regulator
The LM1117 is a low dropout voltage regulator with a dropout of 1.2V at 800mA of load current. It has the same pin-out as Texas Instruments' industry standard LM317.

• Current Limiting and Thermal Protection
• Output Current 800mA
• Line Regulation 0.2% (Max)
• Load Regulation 0.4% (Max)

For details see the datasheet and schematic.