Assembled ATMEL AVR-IO relay prototype board ATtiny2313

Description

AVR-I/O development board 4 optoisolated inputs and 4 relay outputs + temperature sensor DS18B20
Development board for 20 pin AVR microcontrollers ( ATMEL ATtiny2313, AT90S2313, AT90S1200) with power supply circuit, crystal oscillator circuit, RS232 port, ISP port, 4 relays output, 4 optocoupler isolated inputs, digital temperature sensor DS18B20
This board can be used as ready part of you " Smart House system" or for your development project with ATMEL AVR controller, for climate control, as agricultural equipment or Automotive. Board fully assembled and tested.
Features
ICSP 5x2 pin connector for in-circuit programming with wide range of AVR ISP programmers
DIL20 microcontroller socket
digital temperature sensor DS18B20 - programmable resolution 1-Wire digital thermometer , uses only one port of Attiny2313 for control (1-Wire interface). Measures Temperatures from -55°C to +125°C (-67°F to +257°F), ±0.5°C Accuracy from -10°C to +85°C
status LED connected to PB4
reset circuit MC34064Quartz 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 mm (0.12")
FR-4, 1.5 mm (0.062"), green soldermask, white silkscreen component print
dimensions 80.5x75 mm (3.17 x 2.95")
Documentation
Schem
for AVR-I/O board
Dimensions
of AVR-IO board
Components placement
ATtiny2313 HEX test firmware
for testing relay   outputs and RS232.  On first stage this firmware  TURN ON and TURN   OFF each relay output with interval 1 sec. On second stage, firmware send on RS232 (9600 baud, 8 bit, 1 bit stop)   information about measured temperature with interval 1 sec ( quartz crystal 7.3728MHz must be installed on board for correct   timing of RS232)