Sending InfraRed Signal to RS 232: Circuit Requirements

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SUMMARY

To transmit a signal over InfraRed to an RS 232 port, a circuit requires an IR photodiode, a phototransistor, a resistor for current regulation, and a power supply. It is essential to use components with built-in Schmitt triggers to ensure reliable signal transmission. While building the circuit is feasible, purchasing a dedicated converter is recommended for serious applications, as compatibility varies among devices.

PREREQUISITES
  • Understanding of InfraRed communication principles
  • Familiarity with RS 232 serial communication
  • Knowledge of electronic components, specifically IR photodiodes and phototransistors
  • Basic circuit design skills, including current regulation
NEXT STEPS
  • Research the specifications and selection criteria for IR photodiodes and phototransistors
  • Learn about RS 232 pin configurations and compatibility requirements
  • Explore circuit design techniques for signal transmission using Schmitt triggers
  • Investigate commercially available RS 232 to InfraRed converters and their features
USEFUL FOR

Electronics hobbyists, engineers designing communication systems, and anyone involved in InfraRed signal transmission to RS 232 ports.

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does anyone know how what type of circuit i need to transmit a signal over InfraRed. the signal i want to transmit is for example one byte -> 1010 1010

the byte sent will be sent to a RS 232 port

i have a shift register with the data ready to be sent

i know that i need a IR photodiode and a phototransistor
 
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Welcome to PF, Tko.
I have no clue about your problem, but it might be better suited to the Electrical Engineering section.
 
tko_gx said:
does anyone know how what type of circuit i need to transmit a signal over InfraRed. the signal i want to transmit is for example one byte -> 1010 1010

the byte sent will be sent to a RS 232 port

i have a shift register with the data ready to be sent

i know that i need a IR photodiode and a phototransistor

Basically, that is ALL you need (you will also need a resistor to set the current; and a power-supply). However, make sure you get components with built in schmitt triggers (which means that the dioded will either be "on" or "off").

However, for any serious work you are better off buying a converter; they are not very expensive.
Also, note that not all types of equipment work with all converters. They are basically equivalent to a null-modem with only Tx, Rx and GND connected; some equipment requires more connections.
 

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