I have had an Idea for a project for a while, and havent had a whole lot of time to work on it. Last month I finally began piecing together a simple design. I plan to build a wireless transmitter and receiver system. This system will be as simple as possible using easy to find components. The DSP portion of this will be handled by a microcontroller via software (probably written in C). The goal of this project is not to create a cutting edge technology that will be used in the next iPad, but to create a proof of concept to increase my knowledge of digital processing and wireless transmission.
The modulation I have chosen to use is ASK, Amplitude Shift Keying. This is perhaps the simplest method of digital modulation and could be accomplished using a few components. Demodulation of an ASK signal is also easily accomplished with minimal components.
I will be using an RF carrier frequency of 1.0MHz. The main reason I will be using this frequency is largely due to the fact that the only oscillator I have us 1.0MHz and I am too lazy/cheap to buy another one. This frequency is also rather convenient as it will be easier to find discrete component values to build filters, amplifiers....etc.
I plan to process the received digital signal using a microcontroller. I have yet to decide which MCU I will use, but will probably use an arduino or PIC, because those are the only ones I own and (as usual) I am too lazy/cheap to buy anything else. The bulk of the software will be written in C with a possibility of assembly being used at some point.
The final design will include two MCU units. One unit will utilize the transmitter to send a 4 bit binary value. The second unit will utilize the receiver to demodulate/process the received signal and display the 4 bit value to a small LCD display.
Stay tuned for more to come.
Brent
The modulation I have chosen to use is ASK, Amplitude Shift Keying. This is perhaps the simplest method of digital modulation and could be accomplished using a few components. Demodulation of an ASK signal is also easily accomplished with minimal components.
I will be using an RF carrier frequency of 1.0MHz. The main reason I will be using this frequency is largely due to the fact that the only oscillator I have us 1.0MHz and I am too lazy/cheap to buy another one. This frequency is also rather convenient as it will be easier to find discrete component values to build filters, amplifiers....etc.
I plan to process the received digital signal using a microcontroller. I have yet to decide which MCU I will use, but will probably use an arduino or PIC, because those are the only ones I own and (as usual) I am too lazy/cheap to buy anything else. The bulk of the software will be written in C with a possibility of assembly being used at some point.
The final design will include two MCU units. One unit will utilize the transmitter to send a 4 bit binary value. The second unit will utilize the receiver to demodulate/process the received signal and display the 4 bit value to a small LCD display.
Stay tuned for more to come.
Brent