AVR-IO board with 4 optoisolated inputs and 4 relay outputs AVR IO

Development board for 20 pin AVR microcontrollers (such as ATMEL ATtiny2313, AT90S2313, AT90S1200) with power supply circuit, crystal oscillator circuit, RS232 port, ISP port, 4 relays output, 4 optocoupler isolated inputs. This board can be used as ready part of you " Smart House system" or for your development project with ATMEL AVR controller. Board fully assembled and tested.

Features

• ICSP 5x2 pin connector for in-circuit programming with AVR ISP, AVR ISP v3.2 or any other ISP programmer
• DIL20 microcontroller socket
• status LED connected to PB4
• reset circuit MC34064
• Quartz crystall oscilator circuit 7.3728 MHz
• Voltage regulator +5V, 78L05 and filtering capacitors
• Power plug-in jack
• RS232 DB9 female connector , RS232 MAX232 interface circuit with Tx, Rx signals
• 4 optocoupler isolated inputs with screw terminals
• input status LEDs
• 4 relay outputs with 10A/250VAC contacts with screw terminals
• output status LEDs
• four mounting holes 3.3 mm (0.13")
• FR-4, 1.5 mm (0.062"), green soldermask, white silkscreen component print
• dimensions 80.5x75 mm (3.17 x 2.95")

Links

• Schem for AVR-I/O board
• Dimensions of AVR-IO board
• ATtiny2313 HEX test firmware for testing relay outputs and RS232. This firmware with interval 1.5 sec TURN ON and TURN OFF each relay output and send on RS232 (9600 baud, 8 bit, 1 bit stop) information about what RELAY output is enabled&disabled at this moment ( quartz crystal 7.3728MHz must be installed on board for correct working of RS232)

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