Exchange of information between devices. Communication can be wired or wireless.
1
vote
3answers
627 views
How to create a multi-extension intercom system using wired phones?
I want to create a simple (telephone based) intercom system in our new house. Shouting between rooms is not so good, and trying to use an IM client or Facetime doesn't have the immediacy of a good ...
0
votes
3answers
202 views
Serial communication in Atmega128
I want to send some string to PC via serial port. In cute com (software) its displaying the string but with some chars missing. Also some hex numbers are appended at the start and end of the string. ...
2
votes
2answers
627 views
Microchip PIC24F & Android device: Which can be host device?
I work on a project where I want to connect PIC24F (Accessory Development Kit for Android www.microchip.com/android) and Samsung Galaxy S2 that I updated from android 2.3.3 to android version 2.3.4.
I ...
2
votes
1answer
86 views
Selecting communication between microcontrollers at high temperature
I have been assigned to a project to find the best possible communication between several PCB boards which have microcontrollers for a specific function. I need to have all microcontrollers ...
1
vote
1answer
76 views
i2c maximum bus speed calculation
This question is based on the Philips I2C specification UM10204.They gave (section 7.2.1, page 56) for calculating the maximum frequency of the bus:
...
1
vote
1answer
110 views
digital voice on gsm modules
I would like to understand how to handle digital voice on gsm modules.
After reading 3gpp gsm mux 07.10 specification it is my understanding that gsm modules can be configured to transport voice ...
0
votes
1answer
67 views
Calculating the model complexity for wireless sensors
I am coming from geoinformatic background and I do not know anything about the electrical issues.
I have a model for outlier detection for wireless sensor and I want to assess the energy complexity ...
-1
votes
1answer
86 views
Mapping of TDMA frame on to E1 frame
In a GSM network TDMA frame is used to transmit information between Base station and Mobile staton and E1 frame is used as the media to carry information to and in the Backhaul. How is th TDMA frame ...
-2
votes
1answer
42 views
what are the things to keep in mind when interfacing two digital devices?
what are the things to keep in mind when interfacing two digital devices, e.g FPGA with a dual shock controller or CPLD with a PS/2 Mouse, Microcontroller with an FPGA, FPGA with an external RAM.
One ...
-2
votes
1answer
81 views
COM Buffering MICRO PC to store data and transmit over LAN
I'm lokinkg for a simple piece of hardware for to accomplish data buffering storing and forwarding
1) Has at minimum 3 com port
2) Has 1 or more lan port
3) Support SD storage
3) If possible can ...
4
votes
0answers
99 views
Help to identify unknown Sync Serial Bus
Does somebody already seen a sync serial bus communication like that ?
Repeated Pattern :
Detail of beginning :
I fail to identify it...
it look like I2C but :
it have a clock at 2MHz (so ...
3
votes
0answers
53 views
Faulty RS-485 device has irregular effect on neighboring devices in bus setup
I am trying to understand the mystery of how one faulty RS-485 transceiver, in a network bus with several devices, seems to have very irregular influence on its own and its neighbors transmission ...
2
votes
0answers
45 views
why is shadow fading also called slow fading and large-scale fading?
I've encountered several similar claims regarding shadow fading on several books, and have some difficulty understanding them.
(1) Shadow fading is called slow fading because the duration of the fade ...
2
votes
0answers
198 views
Wiring a 1920s intercom to a contemporary door-entry phone
I have recently purchased a 1920s wall-mounted intercom:
I would like to connect this unit to our existing "4+n" door entry phone system, replacing the cheap plastic handset that we currently use ...
1
vote
0answers
153 views
PIC32 read feedback from UART
I'm using a PIC32MX795F512H to set up a Roving RN-131 wifi module using UART.
I can communicate with the device but I want some feedback whether my commands are processed or not.
I basically need to ...
1
vote
0answers
17 views
How to choose the right premble time, acknowledgement time as a percentage of total cycle time in X-MAC Protocol in 802.15.4
I am working on an analytic model for X-MAC, I came across some important duration and I am confused how to select them.
cycle_length = one complete cycle (per transmission) in ms
...
1
vote
0answers
150 views
Wideband Passband RF filter
I require a passband filter with
bandwidth of 500 MHz.
4 GHz central frequency.
minimize the attenuation of the signal (but there is no restriction on this as I am going to use power amplifiers ...
0
votes
0answers
39 views
Erlang B telecom system (grade of service)
I am bit stuck with an answered question that I found online:
We have an Erlang B system where the total number of served call is 15.48 erlangs. The system contains 23 circuits. The incoming calls ...
0
votes
0answers
48 views
Multiplex data and LED pin
I'm looking at performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the ...
0
votes
0answers
131 views
SSTV on an ARM-based board? (Ex: Raspberry Pi)
I'm wondering if there's an open-source SSTV tool (Or even better, a library) that would work on an ARM-based board like the Raspberry Pi.
I've googled a lot with no luck. The available tools (Like ...
0
votes
0answers
104 views
Arduino UNI rel. 3
I am new to Arduino
Device is connected to PC via USB and seems to work fine; however, I am not able to upload anything.
Green light is on and yellow light is on as well.
Below is the message I ...
0
votes
0answers
51 views
Solution for increasing full douplex wireless communication range
I am not relevant with English but i hope that i can explain good my problem. I am planning to design a full duplex wireless communication link. Transceivers send and receive data. As i am interested ...
