IR Detector1Sec Output

RRW1 PAIR THEORY OF OPERATION

The RRW1A (transmitter board) may look quite simple but there is actually quite a lot being done inside each one of the parts. Many individual compo- nents are packed inside of the IR receiver part (U2) itself; so many in fact that if it was built up with discrete components, it would never fit in this little kit case. Inside of the part there is an IR detector diode, amplifier, AGC circuit, bandpass filter, a peak-hold circuit, an integrator, comparators, and an output amplifier. Heck, the part is a kit in itself! Just be glad it’s all in one nice module and ready to go.

IR remote controls send out their data on a 38 kHz carrier much like the way your FM radio does. By modulating the carrier signal with the data you want to send, it is possible to increase the range of the transmission and decrease in- terference from other IR sources like ambient light (the sun pumps out lots of IR!!!). The modulation style used with remotes is called OOK (on off keying). In a nut shell, OOK modulation means the IR LED is switched on and off at a rate of 38 kHz in order to send the needed data. The digital data being sent (ones and zeros) is composed of a certain duration pulse for a one and a dif- ferent duration pulse for a zero. There are pauses with no carrier in-between each one and zero data bit being sent for easy determination of the bit boundaries. A common format for this type of data transmission is called 60/30 PWM. While this may sound complex, it really is not. Let’s take a closer look.

PWM stands for Pulse-Width-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Modulation, meaning we

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

change the on-time of the LED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

within a certain amount of time.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

If we send data at a rate of 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bit per second (bps), each bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

would take up a second of

0Sec

 

 

 

 

 

 

 

 

 

 

 

 

 

1Sec 0Sec

sending time. To represent a 1,

 

 

IR Remote

the LED may be switched on

 

 

Output

and off at 38 kHz for 60% of

the one second time frame (0.60 sec.) of it. For a 0, the LED will be switched on and off at 38 kHz for 30% of the time (0.30 sec.) of the entire second.

0

1

RRW1B • 5

Page 4 Page 6
Page 5
Image 5
Ramsey Electronics rrw1b manual RRW1 Pair Theory of Operation
Page 4 Page 6

rrw1b specifications

The Ramsey Electronics RRW1B is a versatile and compact wireless transmitter and receiver system designed for various applications, including remote control and communications. This innovative device operates on the 27 MHz band, offering a robust solution for users seeking reliable wireless connectivity. One of the standout features of the RRW1B is its impressive transmission range, allowing for operation up to 1000 feet under optimal conditions. This makes it suitable for both hobbyist projects and professional applications where distance and reliability are critical.

The RRW1B utilizes frequency modulation (FM) technology, which ensures clear signal transmission and minimal interference from other devices operating on similar frequencies. Its design incorporates advanced circuitry that enhances its performance, contributing to a stable link between the transmitter and receiver while effectively reducing noise. This technology is particularly beneficial for applications in remote sensing, data logging, and control systems where accuracy is paramount.

Another notable characteristic of the RRW1B is its user-friendly interface, which allows for easy setup and configuration. The system is designed with the end-user in mind, featuring color-coded terminals and intuitive controls that facilitate straightforward installation. This aspect makes it accessible to both beginners and experienced technicians, reducing the learning curve typically associated with wireless systems.

The RRW1B is also characterized by its low power consumption, making it an energy-efficient choice for long-term use. This is particularly advantageous for battery-operated devices, extending their operational lifespan and reducing the frequency of battery replacements. Moreover, the RF (radio frequency) modules used in the RRW1B are known for their durability and resilience, ensuring that users can rely on the system in various environments, including those with challenging electromagnetic conditions.

In summary, the Ramsey Electronics RRW1B stands out due to its excellent range, FM technology, ease of use, and energy efficiency. These features make it a popular choice among hobbyists and professionals alike, providing a seamless wireless solution for a myriad of applications. Whether users are looking to enhance their home automation systems, develop remote-control gadgets, or implement wireless data communication, the RRW1B proves to be a capable and dependable option. Its combination of performance, simplicity, and versatility makes it a valuable addition to the toolkit of anyone interested in electronics and wireless technology.
Top Page Image Contents