タイトルまたは説明

AVR Atmega 8 Development Mother Board - S/N *****0 is especially designed for the students having interest in electronics, embedded system, robotics and industrial-automation. This board is made in such a way that it becomes easier for any body to learn about AVR micro controllers. This board can also be used in various applications and hobby projects.
 
1. Product Description: 
1.1. AVR Atmega 8 Mother Board - S/N *****0: 
 
Includes Atmels ATmega8 Microcontroller with 8kb flash memory working at *6MIPS.
On-board LCD interface (it can also be used for any other general purpose application).
On-board Motor Driver for connecting 2 DC motors or 1 Stepper motors
Onboard servo interface
 
On-board regulated power supply.
 
PC interface through UART.
 
*2 MHz external crystal.
 
Exposed all *6 I/O pins.*
 
Exposed 6 channel I/O pins for ADC *
 
Exposed *7 I/O channels for sensors and other peripherals with 5V/1A power supply.*
 
Exposed 4 channel I/O pins for servo, sensors and other peripherals with dual power supply.
 
One tact switches for external and reset.
 
Four mounted LEDs for status and debugging purpose.
 
Two supply indicator LEDs.
 
Dual power supply through DC source (6V to *6V) or USB powered.
 
On board USB programmer.
 
Dual or single power supply option.
 
Exposed ISP pins for programming.  
 
2.1. Microcontroller 
It is a micro computer chip which stores our programs executes them and takes necessary action. The chip used here is Atmel popular AVR micro controller.
2.2. ***7 VOLTAGE REGULATOR 
It is a three terminal 5V voltage regulator IC used to provide a constant voltage supply of 5V to the micro controller and other peripherals (i.e. sensors etc.) attached in the main board.
 
2.4. L**3DNE MOTOR DRIVER 
This is basically a motor driver IC which takes from microcontroller and is able to drive the DC and stepper motors by using separate power supply.
 
2.5. *6 X 2/*6 X 1 LCD INTERFACE 
The LCD interface can be use to interface any *6x2 or *6x1 character LCD display in 4 bit mode. The LCD display can be used to display any message, status or also can be used for debugging purpose. The LCD interfacing can also be used as a general purpose output port. The pin connections for interfacing an LCD to the board are given below:
D*- PortB0
D*- PortB1
D*- PortB2
D*- PortB3
RS- PortB4
RW- Ground
E- PortB5
XTAL*- PortB6
XTAL*- PortB7
 
2.6. SWITCHES 
One tact switches along with a Reset switch are present on the board in order to provide an external to the board. The switches are connected in the following manner:
 S0 - PortC0
 RST (Reset switch): The Reset switch is basically used to reset a running program right to the beginning it is same as the reset switch of a PC.
 POWER (Power On Switch): It is basically a toggle switch used to provide power supply to the main board. The power can be supplied either by a battery power supply (through LS) or can be USB powered. Thus, the POWER switch can be made to toggle between MP (Main Power) or UP (USB Power).
PROG (Programming Switch): It is also a toggle switch for programming the microcontroller using on board USB programmer. For programming mode it should be ON then RESET should be pressed. For normal operation it should be off.
 
2.7. POWER SUPPLY 
LS (Logic Supply): It consist of two pins one is +ve and another is ve. A battery or a AC adaptor can be connected here to provide power suply to the mother board it provides regulated power supply to all the peripherals present in the mother board and also to the external peripherals connected to the motherboard through a voltage regulator. The DC voltage provided to this terminal should be lies in between 6 to *6 volt. To use the supply connected in LS pin the power switch should be toggled towards MP (Main power).
 DS (Driving Supply): It consist of two pins one is +ve and another is ve.It is basically use to provide a separate high current power supply to the Motors. For operating DC motors you may provide here a Power supply of 5 to *0 volt. For operating a servo motor you may suppose to provide any suitable power supply as per the requirement of your motors (mostly servos works at 4.5 to 6 volt).
 
USB socket: It is basically used for USB communication with the PC. It also provides necessary logic supply to the motherboard. In order to use the USB supply the POWER switch should be toggled towards UP (USB power).

2.8. LEDs 
Active high:
RED LED1 PORTB0
RED LED2 PORTB1
RED LED3 PORTB2
RED LED4 PORTB3
GREEN LS I- Logic Power ON indicator
GREEN DS I- Driver Power ON indicator
 
2.*0. ISP (IN-SYSTEM PROGRAMMING) INTERFACE 
It is the In-System Programming interface of the main board which can be used to connect any ISP programmer to download the programs in the microcontroller. It can also be used in SPI (Serial Peripheral Interface) communication. The pins provided for ISP are given below:
 MOSI- Master Out Slave in PortB3
MISO- Master in Slave out PortB4
 SCK- Serial clock PortB5
RST- Reset Reset
GND- Ground Ground
2.*1. RS **2 INTERFACE 
These is a *-pin interface that can be used for PC controlled applications, debugging purpose, data communication with PC and for inter board data communication. The port consists of three pins, namely, R - Receiver T - Transmitter G - Ground.
2.*2. PB (PORTB) 
It is a general purpose I/O port. This port contains six pins that can be used as digital and digital output. These pins are in the form, DATA-VCC-GROUND (denoted as D + - respectively on the board). The Data pins are towards the microcontroller. The VCC and Ground pins are provided with a 5V/1A power supply.

2.*3. PC (PORTC) 
It is a general purpose I/O port. This port contains six pins that can be used as digital , output and ADC. These pins are in the form, DATA-VCC-GROUND (denoted as D + - respectively on the board). The VCC and Ground pins are provided with a 5V/1A power supply.

2.*4. PC (PORTC) 
It is a general purpose I/O port. This port contains Seven pins that can be used as digital and output.
 
 
2.*5. MOTOR DRIVER CONNECTIONS 
The motor drivers are used to run the DC motors or stepper motors that may be connected to the board according to the data from the microcontroller. The motor drivers link with micro controller is shown bellow.
M0 - PortD4
M1 - PortD5
M2 - PortD6
 M3 - PortD7