ATTiny IR NEC Decoder

Very light-weight library for ATTiny13/25/45/85 to decode an IR signal with NEC Protocol.

Features

The library includes two functions to process the ir data.

• A simple ir_get_data which simply returns the value of the received command. The command is not checked with its invers and the address is also omitted.
• A function ir_get_all_data which returns the command and the address of the received message. Both are checked with their invers if errors occured.

Memory Usage

Standard version for clock frequencies from 1-16MHz

Function	RAM	Flash
ir_get_data	40 bytes	516 bytes
ir_get_all_data	41 bytes	648 bytes
both	41 bytes	706 bytes

Modified version for clock frequencies up to 7MHz

Function	RAM	Flash
ir_get_data	38 bytes	442 bytes
ir_get_all_data	39 bytes	584 bytes
both	39 bytes	642 bytes

Hardware setup

• Used an Arduino Uno as ISP to program the ATTiny45
• Tested with 1MHz and 8MHz
• Used IR Sensor