Forums Search for: Wireless
Coding Wireless protocols for embedded systems
inHello All: Can some one point me to a good book or material on the internet, for coding wireless protocols on embedded systems. What are...
Hello All: Can some one point me to a good book or material on the internet, for coding wireless protocols on embedded systems. What are guidelines, standard techniques, and general pitfalls etc. regs ashu
Start Frame Delimiter
inHi All, I would like to understand the real importance of "start frame delimitor" in a wireless protocol. Especially why do we need a...
Hi All, I would like to understand the real importance of "start frame delimitor" in a wireless protocol. Especially why do we need a fixed pattern like SFD when we already do some pattern matching to detect the beginning of frame in wireless? Why do some protocols have a SFD and some dont ? Is it jsut purely a matter of choice ? regs ashu
Large Wireless networks?
inThe task is to create a large (up to 10k nodes) ad-hoc wireless network covering the area of several sq. km, so there is a need for many...
The task is to create a large (up to 10k nodes) ad-hoc wireless network covering the area of several sq. km, so there is a need for many retransmission hops. The nodes are not moving; however the network should be able to reconfigure itself once a node is added or deleted. The communication in the network is always initiated by a single dedicated master. The master needs to collect...
Acceptance criteria for a wireless network?
inHi. I am having a wireless network developed. The implementation provides for API's to send and receive data from many nodes talking to a PC...
Hi. I am having a wireless network developed. The implementation provides for API's to send and receive data from many nodes talking to a PC over a "master" node (i.e. we are responsible for the application protocol and the contractor is responsible for the PHY/MAC/NWK layers). The deliverables are hardware "nodes" and a software component that runs on the PC and gives the application acces...
Selection of an appropriate wireless network topology
inDear Sirs, I'm considering now my final year project on electronics eng. The project is a wireless indoor network of inexpensive low-power...
Dear Sirs, I'm considering now my final year project on electronics eng. The project is a wireless indoor network of inexpensive low-power devices, that have to communicate with a main unit, connected to PC. Following is the description of this network: 1) The number of network devices is big, say 1000-2000 2) There is no a need that the devices talk one to each other. The only necesarry ...
Wireless trigger
inWe are designing a wireless trigger system for our acquisition devices. The purpose of the trigger system is to remotely start two...
We are designing a wireless trigger system for our acquisition devices. The purpose of the trigger system is to remotely start two independent systems at the same time. We are envisioning the operatior starting the two system with a "keyfob" or similar device. The latency from when the button is pressed to the systems are triggered should be less than 1s. The time difference between the tr...
AVR & RFM70 based digital wireless guitar system
Hi, During last weeks I've asked here a few questions regarding the wireless guitar system I was working on. Now the initial version of...
Hi, During last weeks I've asked here a few questions regarding the wireless guitar system I was working on. Now the initial version of website describing my system is available at: http://www.ise.pw.edu.pl/~wzab/wireless_guitar_system The design is FREE. Most parts are public domain, some are licensed under GPL and/or Creative Commons license. This is still a prototype version, built...
Wireless connection between mini robots
inThis is a multi-part message in MIME format. ------=_NextPart_000_0006_01C4F973.26ECB9A0 Content-Type:...
This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C4F973.26ECB9A0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable Hi all As a student project/research adventure we are planning to build = several small robots that will be coordinated by a main brain via = wireless connection. At this point we seek a suitable m...
Small SBC help needed
inI need to develop a product and a feel that a SBC is the best for what i need to do. I need the SBC to be powerful enough to run...
I need to develop a product and a feel that a SBC is the best for what i need to do. I need the SBC to be powerful enough to run full-screen video (at 600 x 800) but also cheap. My system requirements are stereo audio outputs, CF Card/PCMCIA (for wireless networking, or similar connection for wireless networking), 2 serial ports, and LVDS outputs for video. What SBC would be best for me? Than...
Feasibility of the VERY low power wireless network?
inThere is a network of ~100 wireless sensors, communicating to a single host. All sensors are located within ~50..100m from the host in the...
There is a network of ~100 wireless sensors, communicating to a single host. All sensors are located within ~50..100m from the host in the typical urban environment. Ideally, it would be desirable to poll each sensor at least 10 times/sec. When polling the sensors, we have to get just several bits of the status information from each sensor. Problem: as sensors are battery powered, the...
looking for details on data format for Radio Shack wireless thermometer
inHi, I am hoping to convert a RS wireless thermometer (model 63-1030 ) into a thermostat, by interpreting the received data and processing it...
Hi, I am hoping to convert a RS wireless thermometer (model 63-1030 ) into a thermostat, by interpreting the received data and processing it in a separate micro. Has anyone got any details on the protocol or code they could share? I found a bit of information in this article : www.tinaja.com/glib/muse151.pdf but I'm hoping someone may have some info on how to scale the data and c...
Wireless USB Discussion Group
inHello Group , This is my first post on this group so I am really excited. I am working on Wireless USB and have some knowledge of its inner...
Hello Group , This is my first post on this group so I am really excited. I am working on Wireless USB and have some knowledge of its inner workings. But of course as with any new technology I have some Grey areas from time to time. Thus I would like to start this discussion group so I can share my knowledge with all ppl involved with WiUSB. So my first question is..... Has any one got ...
'Real time' Wireless communication (Fencing scoring)
inHi All, I started taking fencing lessen a few months ago.I also learned also about the 'wired' kind of scoring system they use in...
Hi All, I started taking fencing lessen a few months ago.I also learned also about the 'wired' kind of scoring system they use in fencing: A switch is mounted on the wapons tip and is wired through the uniform to a cable that unrolls from the wall. Lights indicate wich switch is pressed first. My first reaction was offcoarse: why don't we do this wireless ? Ofter some searches a learn...
Wireless/powerline comms, short distance, 100 nodes
inHello NG, In a machine we currently use up to 100 nodes (most installations use under 64 though) on a CAN bus. These nodes are moving along...
Hello NG, In a machine we currently use up to 100 nodes (most installations use under 64 though) on a CAN bus. These nodes are moving along rails and are connected with wire loops. For ease of installation (and node replacement) and cleaning up the wire tangle, we are investigating a wireless or power line system. The 24V DC power can be supplied with sliding contacts but due to space rest...
Wireless sensor network at 868MHz
inHi, I want to realize a wireless sensor network at 868MHz: this network should be used in open ambient, so long range (and low power)...
Hi, I want to realize a wireless sensor network at 868MHz: this network should be used in open ambient, so long range (and low power) is important for me. What do you think is the better solution? About protocol: i thougth ZigBee, but i haven't found interesting solution at this range (I may be mistaken)...A standard implementation is the best solution, but non strictly necessary....For me a...
ESP8266 based digital wireless system for electric guitar
inHi, Some time ago I have published the wireless system for electric guitar based on ATmega microcontrollers, RFM70 radio modules and CS5343 ADC:...
Hi, Some time ago I have published the wireless system for electric guitar based on ATmega microcontrollers, RFM70 radio modules and CS5343 ADC: http://wzab.cba.pl/STARE/wireless_guitar_system/index.html It seems to me, that ESP8266 may be used instead of ATmega88 and RFM70 in the transmitter, eliminating also the need of dedicated receiver (as the sound and control data will be tr
Solution for long range wireless link on ISM band?
inI am looking for a solution for connecting equipment over a wireless link with a range of 2-3 Km. Should be on ISM band. Any good...
I am looking for a solution for connecting equipment over a wireless link with a range of 2-3 Km. Should be on ISM band. Any good ideas? Thanks
Creating a cheap wireless "server" with BSD.
inSorry for the multi-post. I first posted this to comp.unix.bsd.openbsd.misc, and then thought that I might want a larger audience. So then I...
Sorry for the multi-post. I first posted this to comp.unix.bsd.openbsd.misc, and then thought that I might want a larger audience. So then I posted to comp.arch, and someone there suggested that THIS group would be the appropriate place to post my questions. --- Original Message Follows --- 'd like to try to create a cheap, small, wireless "server" with BSD/Linux. I'm not sure where I wa...
AVR & RFM70 based wireless guitar system - two RFM70 in parallel to increase the bandwidth?
inHi, I've just finished my RFM70 based wireless guitar system (I hope to publish it soon, but code and documentation needs some polishing ...
Hi, I've just finished my RFM70 based wireless guitar system (I hope to publish it soon, but code and documentation needs some polishing - the system is designed to be very cheap - just CS5343/4 as ADC, ATmega88 and RFM70 in the transmitter, and RFM70 with ATmega32u4 in the receiver. The system is visible as USB MIDI/audio device so you can connect it thorough "alsa_in" to "jakcd...
Wireless short/medium range data transfer
inWe have a device that collects data from vehicles. Currently the data is transferred to office with GSM modems. Some customers would like to...
We have a device that collects data from vehicles. Currently the data is transferred to office with GSM modems. Some customers would like to avoid the costs involved to this option and have another wireless method to transfer the data. GPRS is not acceptable solution, there should not be any costs at all. In this case the vehicles visit a terminal regualiry, so short/medium rang...