Tagged Questions

2
votes
2answers
183 views

Long Range RF communication

After playing with Arduino and different kind of sensors for my garden, now I'm starting a new project for my free time. I want to work with RF communications because I need a long range device for ...
0
votes
0answers
83 views

RF Link with APC220 between two PIC16F877's

I am attempting to communicate through a RF link between two PIC16F877's using APC220 Radio Transients. When the PIC UART's are connected with wires between TX and RX they communicate just fine, but ...
2
votes
1answer
113 views

Low-power wireless module strategy

I'm designing low-power sensor modules which will be spread over a reasonably small area. The modules are all battery powered and should operate for a decently long time without having to ...
5
votes
2answers
74 views

Antenna Design Filtering Out UnWanted Frequencies

I was wondering if someone could explain to someone with no electrical engineering background where would one place the resonator whose sole responsibility is to amplify sine waves at a particular ...
1
vote
1answer
81 views

Antenna Array Solid Angle

I am currently trying to design, in theory, a large wireless power spot beaming antenna for a satellite to transfer 200 MW at a wavelength of 116 mm. I was wondering how I could design it so that a ...
6
votes
1answer
262 views

Bluetooth vs Bluetooth Smart (Low Energy)

Im trying to decide between Bluetooth and Bluetooth LE. My device needs to transfer 375 bytes per second. Bluetooth LE can send packets of 20 bytes max, so this boils down to about 20 packets per ...
1
vote
1answer
122 views

Is it possible to detect a transmitter that comes within a certan range? [closed]

I know nothing of electronics. My experience is with software engineering, not electronic engineering. This is a "Is it possible?" type question. If it isn't possible, where are the barriers? I'm ...
-1
votes
1answer
97 views

VoIP handheld device with secure point-to-point communication over WiFi [closed]

All hams on deck! Bad joke aside, I'm in need of some suggestions. I'm working on a project and have hit a wall. I'm designing a solution that allows point-to-point wireless communication over a ...
1
vote
4answers
974 views

Basic microcontroller + RF transmitter/receiver plausibility

I am a complete beginner (I have only gone through the beginners book to Arduino + done a few small projects). I want to know if it's possible to connect a very basic/cheap microcontroller like the ...
1
vote
1answer
632 views

Cheapest 5 meter wireless communication + microcontroller [closed]

I want to have two microcontrollers wirelessly communicate with each other (about 5 meters) (cheapest is radio or Bluetooth, right?) and then beep/blink an LED, etc. depending on whether or not there ...
1
vote
1answer
114 views

Wirelessly activate devices using light weight and low-power solution

I have several circuits which I need to turn on and off wirelessly. The rules are: They are placed inside a transparent small box (about 50x50x50 cm) The control unit\transmitter can be placed ...
0
votes
1answer
166 views

Bluetooth or Wi-Fi or other protocol signal detector

What's the best way to have a Bluetooth/Wi-FI/other kind of protocol signal detector? What I'm looking it's something like this: New Bluetooth signal detected Wakes up MCU (e.g. by interrupt pin) ...
-2
votes
1answer
80 views

when will the frequency of a wireless signal change? [closed]

So, one transmits a signal with particular wireless frequency. If a receiver and sender were not moving, what may cause the frequency of a wireless signal to change?
0
votes
3answers
278 views

Suggestions for a Point-to-Point reliable Wireless Communication Module

I've to implement a wireless communication system. Details are as follows. Range is about 600m Point-to-point communication No LoS is available. (but not highly obstructed) Won't need much higher ...
1
vote
1answer
105 views

RF link wireless trigger (press/hold) with no mcu

i have a talking birthday card to trigger from distance of 20-100m (line of sight). what would be the easiest way to send press/release (and hold) commands? i expect a false positive here and there. ...
1
vote
2answers
224 views

Programmable USB RF transceiver

I've been trying, and failing, to find a USB RF tranceiver that I can program or that has an API I can use. Does anyone know if such a thing exists, or suggest how I could about creating one?
2
votes
1answer
205 views

RF Microcontroller Selection

I have recently found that we need a security system in our home but am unwilling to pay a company $80/month to monitor and let them run wire all over the house. So I got to thinking that why can I ...
0
votes
1answer
220 views

High-speed wireless digital design

I need some input on implementation of a high-speed (>100Mbps) wireless digital communication design. The part which concerns me is from the data input to the RF PA, we got a guy working one the ...
8
votes
3answers
4k views

Why do higher frequency waves have better penetration?

In free space, lower frequency signals seems to go farther because the signal is either diffracted by the ground or reflected by the upper atmospheric layers, making it actually go farther. In urban ...
1
vote
2answers
213 views

Anyone know of a good/cheep usb dongle to pick up ULF (.3 - 3kHz) radio?

I've bought a pack with 3 temperature senders and 1 receiver. But I want more, and I also want datalogging. Is there a USB dongle that let's me pick up on a given frequency, lets say '433.92 Hz' and ...
2
votes
2answers
419 views

Cheapest way to wirelessly synchronize two MCUs

I have two battery powered MCUs about 30cm apart, one will be the master, and one the slave. Each MCU has several LEDs connected which flash in a sequence. All I want to do is synchronize the two ...
5
votes
2answers
1k views

Improve range of 433MHz RF link

I have a system comprised of a wireless sensor which transmits temperature readings to a main base. The wireless sensor system is made up of: 12F683 pic to take the temperature reading (manchester ...
3
votes
5answers
4k views

Best way to send sensor readings over simple RF connection

I have bought a pair of simple 315MHz TX/RX modules. I want to use these to connect a battery powered ATTiny85 to an Arduino base station. The ATTiny needs to regularly wake up and send a sensor ...
2
votes
3answers
553 views

Low-cost, low-range RF transceivers

Basically I need a low-cost wireless communications module. My requirements would be ~10bit/s , ~2-3m range and up to 1$ for each. Can be receiver and transmitter separately as well. I think it should ...
4
votes
2answers
522 views

Wireless transmission/reception through 100 feet (30m), including concrete wall

I have an electrical engineering degree, but little experience in building wireless equipment. I need to transmit a signal through about 100 feet of distance, including a concrete wall. I need ...
1
vote
2answers
456 views

FPGA board for implementing wireless video

I want to build a FPGA based prototype for uncompressed video over wireless connection with one box being transmitter and other a receiver (to display). The transceiver speed for HD video (1080) is ...
4
votes
2answers
326 views

What low power RF Transmitter to use for crowded signal area

Hi I'm fairly green when it comes to RF technology in circuits. Here's my problem: I need a low power RF transmitter module (3 - 5v) for my application. It's a small embedded device and all it does ...