Input Devices

  • Measure something: add a sensor to a microcontroller board that you have designed and read it.
This week I decided to make ATMEGA 328 board.
Input Devices


Some of the Features of ATMEGA 328 are

  • 1.8-5.5V operating range
  • Up to 20MHz
  • 32kB Flash program memory
  • 1kB EEPROM
  • 2kB Internal SRAM
  • Two 8-bit Timer/Counters
  • One 16-bit Timer/Counter
  • RTC with separate oscillator
  • 6 PWM Channels
  • 8 Channel 10-bit ADC
  • Serial USART
  • Master/Slave SPI interface
  • 2-wire (I2C) interface
  • Watchdog timer
  • Analog comparator
  • Data retention: 20 years at 85C/ 100 years at 25C
  • 23 IO lines


I designed ATMEGA 328 board in EAGLE. The design files are available here
The Soldering process was difficult because the traces were minute,next time I decided to go for a better design.

Breakout board for PIR sensor

In order to connect an LED and PIR sensor I have designed a breakout board which has red led and 499 ohm resistor
The schematic and board screenshots are provided above.It can be seen that there is a provision for led,resistor,pin header thats all.This circuit makes the job simpler.
Input Devices Schematic
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