December 2012

Doc ID 023257 Rev 1

1/14

UM1548

User manual

IR remote trasmitter STEVAL-IHM037V1

Introduction

The IR transmitter solution features three buttons which can be used to transmit three

unique IR commands for various IR remote control applications. It is a direct implementation

of the AN2957 application note, ‘Implementing an RC5 infrared transmitter using the IR

timer modulator of the STM8L101xx microcontroller’. An STM8L101xx low power MCU is

used to implement this design. The existing firmware, which is supplied with the application

note, was modified slightly to accommodate for the three keys present in the design which

are used to control speed-up, speed-down and power-on/off toggle operations. The circuit

runs on a CR2032 coin cell battery and is designed to fit into a small key fob type enclosure.

Figure 1.

IR remote transmitter STEVAL-IHM037V1

This document explains the different parts and functions of the IR remote transmitter.

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