Infrared

A tiny sandwich flag connected perpendicular to the motor spindle aids observation of how long it takes to complete one full rotation. This worked initially, as each burst from the capacitor barely moved the flag 1/4 of a rotation. As the circuit variations became more efficient and powerful (the capacitors values became larger), a single burst provided rotational speed faster than a human can count. I took a huge diversion and built a counter circuit. A pushbutton (SW1).....

Briefly it`s an Infrared receiver which communicated with your pc to command many windows application, so once you have built the interface, programmed the pic16f84 with the code and connected everything to your serial com2 you`ll be able to command your pc applications through your TV or VCR remote !..

By using Fujitsu (Japan) "IR-Commander" or "Crossam2+ ( Japan ) ", you get high reliability computerized home control environment. IR Commander is a multi-function adapter that supported IrDA / ASK / 24 feet 360 degree TV-Remote. Crossam2+ is the remotes which equipped RS-232. I recommend above two devices. Another selection, use Actisys ACT-IR200L. ACT-IR200L has TV-Remote function, It isn`t known generally. RemoconCon use this TV-Remote function...

Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch...

These circuits were taken from a few application notes on infrared remote control devices. They use a current compensation method to separate the modulated light pulses from ambient light. They appear to have limited bandwidth and may only work at the 30KHz to 50KHz frequencies often used by TV and VCR remotes. I have not yet tested the circuits...

Views: 1653 | Votes: 8 | Comments: 0 | Rating: 9 | Rank: 2 | Added: Oct 5, 2012 |

I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote control) store them in RAM & EEPROM and transmit any IR op-code to the RCX in turn. Included in the firmware is a routine that takes any opcode(s) and expand it to the proper IR packet for transmission to the RCX. I've used the UIRT circuit with a few modifications for the hardware. The UIRT includes a serial port.....

Views: 2592 | Votes: 107 | Comments: 0 | Rating: 0 | Rank: 7 | Added: Oct 5, 2012 |

The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photodetector pair up to a distance of about 12 cm from it. The circuit uses the commonly available telephony ICs such as dial-tone generator 91214B/91215B (IC1) and DTMF decoder CM8870 (IC2) in conjunction with infrared LED (IR LED1), photodiode D1,..

With the circuit design described here, any derivative of the 8051 microcontroller can communicate using the serial-infrared (SIR) format established by the Infrared Data Association (IrDA)...

The circuit above illustrates using the IR receiver module along with a PIC12F629 microcontroller to decode 5 individual IR remote control keys so the circuit will only toggle one of the 4 outputs when a particular key is pressed. The 5th key is assigned to the master clear function that toggles off the 4 outputs. Works with most hand held IR remote controls that send a single data stream. However, some remotes send multiple groups of data and only the.....

This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles...

Here is a handy gadget for test- ing of infrared (IR) based re- mote control transmitters used for TVs and VCRs etc. The IR signals from a remote control transmitter are sensed by the IR sensor module in the tester and its output at pin 2 goes low. This in turn switches on transistor T1 and causes LED1 to blink. At the same time, the buzzer beeps at the same rate as the incoming signals from the remote control transmitter...

This circuit can be used as an Infrared beam barrier as well as a proximity detector. The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules please refer to their respective datasheets. The receiver consists of a 555 timer IC working as an oscillator at about 38Khz (also works from 36kHz to 40kHz) which has to be adjusted using the 10K preset. The duty.....

Infrared interruption counter is a reliable circuit that takes over the task of counting number of interruptions very accurately. When somebody enters into the room, then the Counter is Incremented by one. The total number of Persons inside the Room is displayed on the seven segment displays...

The need for ever increasing data rates required by a vast array of devices, such as notebook computers, printers, mobile phones, pagers and modems, has been satisfied by the technology of infrared data transmission. The Infrared Data Association (IrDA®) standard, which covers data rates from 2400bps to 4Mbps, is the overwhelming choice for infrared data transmission...

Views: 1048 | Votes: 13 | Comments: 0 | Rating: 4 | Rank: 3 | Added: Sep 15, 2012 |

This Project Line Following Autonomous Robot is based on 8 bit Microcontroller AT89C2051. This Robot follows the black line which is drawn over the white surface or it follows the white line which is drawn over the black surface. The infrared sensors are used to sense the line. When the infrared signal falls on the white surface, it gets reflected and if it falls on the black surface, it is not reflected this principle is used to scan the Lines for the Robot...

I thought about this circuit when I heard that a lot cleaning personal in hotels were either dusting rooms more often than necessary or not enough. I have not yet built and tested this circuit completely but in concept it should work. The circuit draws very low current from a +3v battery and could be housed in a package similar to a small ashtray. The assembly might be placed in a suitable out of the way area to collect dust. It would alert a maid when it was time to dust.....

This circuit lets you control any line powered electrical device (a lamp, television, fan, etc.) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With this circuit, you can put them back into use. The circuit looks for any modulated IR source and uses it to control a TRIAC, which then switches any appliance connected to it's socket. For example, you can use it to.....

This is a general purpose remote control project with using programmable PIC microcontrollers. Schematics are shown for using infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Well-known such IC-s are Holtek HT-12D, HT-12E and Motorola MC145026, MC145027, MC145028...

Figure 1 shows the relative responsivity and emission spectra for an Infineon (www.infineon.com) SFH409 LED. This infrared GaAs LED has peak emission at 940 nm with a half-peak bandwidth of 50 nm. In detection mode, it peaks at 920 nm with a half-peak bandwidth of 55 nm. As Figure 1 shows, the wavelength of peak responsivity is shorter than the peak-emission wavelength, and a fair amount of overlap exists between the two curves. Thanks to this overlap, the LED is useful.....

The transmitter for the wireless headphones is built around a CD4046 CMOS phase-locked loop, coupled with a driver transistor, and a pair of infrared LEDs. ..