![arduino software serial and wire library interference arduino software serial and wire library interference](http://arduinolearning.com/wp-content/uploads/2020/06/Arduino-and-VL6180X-layout.jpg)
Logical ‘0’ is transmitted with a 562.5 µs long HIGH pulse followed by a 562.5 µs long LOW pulse: Logical ‘1’ starts with a 562.5 µs long HIGH pulse of 38 kHz IR followed by a 1,687.5 µs long LOW pulse. The NEC protocol is also the most common type in Arduino projects, so I’ll use it as an example to show you how the receiver converts the modulated IR signal to a binary one. Sony, Matsushita, NEC, and RC5 are some of the more common protocols. There are many IR transmission protocols. The pattern in which the modulated IR signal is converted to binary is defined by a transmission protocol. It then amplifies the modulated signal with a pre-amplifier and converts it to a binary signal before sending it to a microcontroller.
![arduino software serial and wire library interference arduino software serial and wire library interference](https://i1.wp.com/surtrtech.com/wp-content/uploads/2019/04/wiring_lcd.png)
The receiver diode detects all frequencies of IR light, but it has a band-pass filter and only lets through IR at 38 kHz. This way the IR receiver will know that the 38 kHz signal was sent from the transmitter and not picked up from the surrounding environment. The carrier frequency used by most transmitters is 38 kHz, because it is rare in nature and thus can be distinguished from ambient noise.
#ARDUINO SOFTWARE SERIAL AND WIRE LIBRARY INTERFERENCE SERIES#
The modulated IR signal is a series of IR light pulses switched on and off at a high frequency known as the carrier frequency. The IR receiver then demodulates the IR light signal and converts it back to binary before passing on the information to a microcontroller: The transmitting LED converts the modulated electrical signal into a modulated IR light signal. This electrical signal is sent to the transmitting LED. In IR signal modulation, an encoder on the IR remote converts a binary signal into a modulated electrical signal.
![arduino software serial and wire library interference arduino software serial and wire library interference](https://i.stack.imgur.com/9LFZx.jpg)
That means there is a lot of IR light noise all around us. To prevent this noise from interfering with the IR signal, a signal modulation technique is used. IR light is emitted by the sun, light bulbs, and anything else that produces heat.