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Remote control uses an IR
receiver chip to receive the IR signal from the remote -
Infrared based electronic circuit diagrams / circuit schematics. . .
Remote Extender Circuit - This circuit is designed to be placed directly in front of a standard TV or VCR remote. The
exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more
powerful. Using the device, the remote can operate a TV or VCR over three times the normal distance . . .
[Circuit by David A. Johnson P.E., 06/04/00]
Remote Infrared Terminal - Some projects need a control panel, but are in situations which make that cumbersome. Unlike
bench equipment, which would be useless without built-in readouts, other control devices could use interfacing
just to alter a few settings or take occasional readings. This device's first job will be interfacing to my
hydroponic controler. . . . [by Luhan Monat-Mesa Arizona]
Remote IR Terminal
- This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is sent and received
in ASCII with no regard to what the data means to any particular device.
. . . [Luhan Monat - Mesa Arizona]
Remote Range
Extender TV/VCR - I often get frustrated by how poor
some infrared remotes in many new electronic devices operate. I used to be able to turn on the TV from 30 feet
away. Now, it seems that I have to get within 15 feet. To address this issue, I designed the circuit shown below.
The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices. The result is a
communications range some 4 to 5 times longer. . . . [Hobby Circuit designed by Dave Johnson P.E., 12/14/00]
Replace
a Pushbutton Switch with this Infrared Safety Switch -
Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety
switch . . . [Hobby Circuit designed by David Johnson P.E., 07/11/06]
RF Wireless PWM DC motor Speed control - The wireless PWM DC motor transmitter circuit consists of WZ-X01 RF module, Holtek HT-640
encoder and 8-bit A/D converter. U1 ADC0804 converts the analog voltage to digital data; U2 encodes that data
(D0~D6) along with D6, D7 and transmitting through the RF transmitter module. The potentiometer VR1 varies the
voltage to the A/D U1 pin6, since only the lower 6 bits are used; the trim pot VR2 has to adjust so that the
maximum input to the U1 will not exceed 1. 25V. The S2 (D6) and S3 (D7) are used for controlling the rotation
direction of the motors. S1 set the transmitter address; this address has to match with the address of the
decoder circuit. . .
RFID Smart Key
Detector - The hobby circuit below was designed to
indicate if a key held over the small coil of wire contains a 125KHz RFID chip. These chips are often used in
smart car ignition keys. The left side circuit forms a 125KHz power oscillator, which drives the 680uH a . . .
[Hobby Circuit designed by David Johnson P.E., 07/09/06]
RFID Test
Circuit - I designed this test the concept of using
light techniques to send identification data instead of RF. A more detailed discussion on this scheme can be
found in the Imagineered new products section . . . [Hobby Circuit designed by David Johnson P.E., 02/11/02]
RS 232 to TTL converter tests UARTs with a PC - 05/29/08 EDN Design Idea A simple RS-232-to-TTL converter tests UARTs using a PC's serial
port for power. . . [by Matthieu Bienvenüe, Malissard, France]
RS-232-To-TTL Converter Tests Uarts With A PC - 05/29/08 EDN Design Idea A simple RS-232-to-TTL converter tests UARTs using a PC's serial
port for power. . . [by Matthieu Bienvenüe, Malissard, France]
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