I will show you how to make a simple wifi receiver extender made from household items. I had problems getting a good wifi signal in our house so I thought of this. Circuit Design Electronic Circuits Tutorials Components Articles Invention Stories Forum Knowledge Base Projects DIY Reviews How to Guest Post C-Programs. Silicon Labs offers highly integrated, robust, reliable and easy to use wireless RF solutions with CMOS technology. Solutions range from ISM band receiver ICs to wireless MCUs.
Wireless RF Remote Control Circuit Diagram. This radio frequency (RF) transmission project employs Amplitude Shift Keying (ASK) with transmitter/receiver (Tx/Rx) pair operating at 4. MHz. The transmitter module takes serial input and transmits these signals through RF. The transmitted signals are received by the receiver module placed away from the source of transmission. The system allows one way communication between two nodes, namely, transmission and reception. The RF module has been used in conjunction with a set of four channel encoder/decoder ICs. Here HT1. 2E & HT1. D have been used as encoder and decoder respectively. The encoder converts the parallel inputs (from the remote switches) into serial set of signals. These signals are serially transferred through RF to the reception point. The decoder is used after the RF receiver to decode the serial format and retrieve the original signals as outputs. These outputs can be observed on corresponding LEDs. Encoder IC (HT1. 2E) receives parallel data in the form of address bits and control bits. The control signals from remote switches along with 8 address bits constitute a set of 1. The encoder HT1. 2E encodes these parallel signals into serial bits. Transmission is enabled by providing ground to pin. The control signals are given at pins 1. HT1. 2E. The serial data is fed to the RF transmitter through pin. HT1. 2E. Transmitter, upon receiving serial data from encoder IC (HT1. E), transmits it wirelessly to the RF receiver. The receiver, upon receiving these signals, sends them to the decoder IC (HT1. D) through pin. 2. The serial data is received at the data pin (DIN, pin. HT1. 2D. The decoder then retrieves the original parallel format from the received serial data. When no signal is received at data pin of HT1. D, it remains in standby mode and consumes very less current (less than 1. When signal is received by receiver, it is given to DIN pin (pin. HT1. 2D. On reception of signal, oscillator of HT1. D gets activated. IC HT1. 2D then decodes the serial data and checks the address bits three times. If these bits match with the local address pins (pins 1- 8) of HT1. D, then it puts the data bits on its data pins (pins 1. VT pin high. An LED is connected to VT pin (pin. This LED works as an indicator to indicate a valid transmission. The corresponding output is thus generated at the data pins of decoder IC. A signal is sent by lowering any or all the pins 1. HT1. 2E and corresponding signal is received at receiver’s end (at HT1. D). Address bits are configured by using the by using the first 8 pins of both encoder and decoder ICs. To send a particular signal, address bits must be same at encoder and decoder ICs. By configuring the address bits properly, a single RF transmitter can also be used to control different RF receivers of same frequency. To summarize, on each transmission, 1. The signal is received at receiver’s end which is then fed into decoder IC. If address bits get matched, decoder converts it into parallel data and the corresponding data bits get lowered which could be then used to drive the LEDs. The outputs from this system can either be used in negative logic or NOT gates (like 7. LS0. 4) can be incorporated at data pins.
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January 2017
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