ATmega48/88/168 Development Board

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1 ATmega// Development Board This is versatile development board for AVR microcontrollers ATmega//. It is good for testing and debugging embedded programs. It has many built-in peripheries connected to microcontroller so you can use them without soldering. ATmega microcontrollers are produced by ATMEL and they include a lot of features: I/O, Timers, PWM generators, ADC, RS, TWI, SPI, Analog Comparator, Oscillator, EEPROM These microcontrollers are very versatile, easy to program and easy to use. This is the reason why I like these microcontrollers and why I decided to make development board for them. LEDs Reset Screw Terminals RS Config Header Port D Port C Piezo Pot. Temp. Analog Temp. PWM Crystal Port B A REF ISP CPU Power Supply Buttons Top view Bottom view

2 . ATmega AVR microcontroller in DIP package The development board is designed to use ATmega with kb flash memory or ATmega (kb), ATmega (kb). New version of these microcontrollers ATmegaP/P/P and ATmegaP (with kb) are pin compatible so they can be used also. External crystal X is placed in socket, so it is easy to change it or remove it. If internal oscillator is used then two PB and PB pins dedicated for crystal can be connected to the Port B connector. Microcontroller can be reset by pressing reset button S.. AVR Ports B, C, D headers If built in peripheries are not used another device can be connected to the PORT B, C and D. Each port is connected to the 0-pin header. You could connect LCD display, Rotary Encoder, SD Card Reader, etc. with microcontroller. See my future posts.

3 . V Power supply Both AC and DC voltage can be plugged in, because of using rectifier bridge. Input voltage can be connected to.mm power jack connector or screw terminal. Power can be switch on / off by SW. Power supply voltage is stabilized by common IO 0. When the power is switch on red LED is lighted.. x LEDs Four green LEDs can be connected to the Port D shorting jumpers JMP-.. x Buttons Four buttons are connected to the Port B.. Piezo Piezo speaker can be connected to pin PB through JMP.

4 . ADC accessories The microcontroller has built-in 0bits AD converter. On the board is LC filter for power supply of this ADC. You can use internal or external reference. The rotary trimming resistor R is connected to Aref input for playing with the external reference.. Potentiometer For simulation of varying ADC input voltage the rotary trimming resistor R can be connected to PC (ADC) through JMP.. Temperature sensors If you want to play with temperature sensor, you can connect temperature sensor with either analog or PWM output. Temperature sensor with analog output can be connected to the (ADC0) through JMP0. Temperature sensor with PWM output can be connected to the PB0 through JMP.

5 0. RS line Standard serial interface is placed on the board. Level shifter MAX is used. MAX has two receiver and two transmitter lines. You can connect RXD and TXD of RS with RXD and TXD of microcontroller with help of config header. RTS and CTS of RS can be connected with PD and PD through JMP and JMP. See config header part.. Config Header Config header allows interconnect different I/O microcontroller pins with RS line or with screw terminal.. Screw Terminals Screw terminals allow easily connect wires to microcontroller. Through this terminal you compose for example frequency counter of voltmeter, etc. Ground and Volts are also presented on screw terminal.

6 . ISP Development board includes serial port interface to allow direct in-system programming (ISP). Microcontroller can be programmed trough RS serial port by using program Pony Prog or AVDdude (ponyser). To avoid interference with RS signals, programmer can be disconnected using analog switches 0. These switches can be closed manually by SW or automatically when the reset is active (using JMP).. Mounting Holes In each corner of PCB is placed one ø.mm mounting hole. You can find this article on my blog site: Following web side inspired me to build the development board.

7 A B PROCESSOR PB PB 0 S C pf C pf J JMP JMP CANON X 0MHz R 0K RESET C 00nF SERIAL RS- INTERFACE PC PD0 PD PD PD PD PD PD PD PB0 RS_RXD RS_RTS RS_TXD RS_CTS 0 IO PC (RESET) PD0 (RXD) PD (TXD) PD (INT0) PD (INT/OCB) PD (T0/XCK) PB (TOSC/XTAL) PB (TOSC/XTAL) PD (T/OC0B) PD (AIN0/OC0A) PD (AIN) PB0 (ICP/CLKO) ATmega C uf RS_RXD RS_CTS RS_TXD RS_RTS C uf C uf (ADC/SCL) PC (ADC/SDA) PC (ADC) PC (ADC) PC (ADC) PC (ADC0) A A (SCK) PB (MISO) PB (OCA/MOSI) PB (SS/OCB) PB IO VEE (OCA) PB C+ C- C+ C- TOUT TIN TOUT TIN RIN ROUT RIN ROUT MAX 0 0 PC PC PC PC PC A PB PB PB PB PB C uf C uf A SERIAL_TXD SERIAL_CTS SERIAL_RXD SERIAL_RTS BYPASS CAPACITOR I/O PORT INTERFACE PB PB PB PB0 PC PC PC PD PD PD PD0 P 0 P PORTB 0 P C 00pF PORTC 0 PORTD PB PB PB PB PC PC PC PD PD PD PD PUSHBUTTONS PB PB PB PB STATUS LED S R 0 R 0 R 0 R 0 LED LED LED LED S JMP JMP JMP JMP S PD PD PD PD POWER JACK / SWITCH / REGULATOR / POWER LED J DC JACK J DC POWER DB Bridge S SW POWER SW C 0uF TEMPERATURE SENSORs C 00nF POTENCIOMETER IO MC0CT IN OUT IO LMCZ +VS VOUT IO SMT0-0 +VS VOUT RA 0k C 00nF C 00nF JMP C 0uF JMP0 JMP PC PB0 R 0 LED A B C CONFIG HEADER ANALOG VOLTAGES PIEZO ISP (IN-SYSTEM PROGRAMMING) JMP C D PD0 SERIAL_RXD PC TERM PD SERIAL_RTS SERIAL_CTS MOUNTING HOLES MTH MNT MNT MNT P 0 CONFIG HEADER JMP JMP PD SERIAL_TXD PC TERM PD PD PD L 00nH R k C 00nF C0 00nF A PB JMP SCREW TERMINALS PC TERM TERM R 0 P LS Speaker TERMINALS J 0 SUB D R0k D V Rk Rk D V R K C 0p T BC D V IOA VHC0N IOB Title Size A IOC IOD 0 PC PB PB Number Date: Sheet of File: G:\== Altium Designer ==\..\Mega.SchDocDrawn By: PB RESET MISO R 00 MOSI SCK T BCC R 0k R 0k C 00nF SW ISP SW Revision R 0k D