AVR-IO board with 4 opto inputs, 4 relay outputs, temperature sensor DS18B20

Brand: Bravekit
Product Code: AVR-IO-RELAY
Availability: In Stock

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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


  • 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
  • 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
  • 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")



  • Schem for AVR-I/O board
  • AVR-IO components placement
  • Dimensions of AVR-IO board
  • 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)

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