Questions tagged [protocol]

A protcol is a ruleset for formatting and exchanging messages.

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What is the rs-485 protocol for controlling old flipdot displays?

I have an old Luminator flipdot 16x112 pixel bus destination sign I'd like to hack. There are numerous resources on the internet for controlling the flipdot display panels with new circuitry, ...
5
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3answers
819 views

Method required to enable a toy “vehicle” to follow a “target” wirelessly?

I am trying to create a small robot toy car with the ability to follow a person around, with a range of about 50 m. Ideally the person will be provided with a small transmitter of some kind, and the ...
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1answer
342 views

sending data with cc2510

Hy, I'm trying to send simple 1 Byte package with cc2510dk-mini. The idea is to press button on on device and the led on the other lights up. I'm stuck with the problem, when I try to send data, radio ...
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3answers
1k views

Reverse-engineering IR check bits/CRC

I'm trying to build a simple Arduino-based IR remote control for a cheap toy IR-controlled helicopter (same as this one - it's called "Diamond Gyro" or "Diamond Force"). I've decoded the IR protocol ...
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1answer
164 views

AV.link dongle (SCART's CEC)

I am looking for a device I can plug into an old TV's SCART port, which will feed me remote control commands (like 'arrow-up', 'OK', 'menu', etc.) received over the SCART connector's AV.link (control ...
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0answers
171 views

Not seeing set_address packet using USBTrace

I'm currently exploring the wonderous world of the USB Stack. I'm using a PIC18F2550 and the USB IO example available at www.moty22.co.uk. The code works as expected, but when using USBTrace (or any ...
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2answers
13k views

Rolling Code Explanation

Could somebody explain how rolling code protocols such as KeeLoq work? I understand the basic premise that they use a different code each time so you can't just use replay attack, but I don't ...
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3answers
1k views

Board to board communication (Backplane) in possible noisy environment- UART, RS232, RS422, RS485?

I've seen alot of references for RS422 and RS485 using cables and twisted pair wiring, but how well do they do over short distances and with just a PCB layout (no cables at all) ? Do people do that ? ...
5
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1answer
667 views

Detect Hama IR Remote Protocol

I'm working on an universal receiver and I'm not able to detect what protocol is used by the Hama VRC-1100 MCE Remote. The signal is this: The Time/Div is set to 2 mS and the distance between a ...
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1answer
3k views

GPS over CAN bus

How is GPS data typically sent over CAN bus? Some context: I'm looking to simulate sending and for receiving GPS data (using a Linux-running embedded device with CAN interface), to work side-by-side ...
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0answers
106 views

Do you consider this design as an application layer on top of the CAN protocol?

This is a follow up question from my previous question about How do I program 2 CAN nodes to transmit continuously in succession? I'm planning to add another layer on top of the CAN protocol and I ...
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1answer
2k views

Help for find Camera Datasheet or interface to st32f103

I want to use of S302's Camera(the S302 is a mobile phone with a good camera) and interface it st32f103 but, unfortunately I can't find any datasheet for it. Also, I can find the schematic of Phone ...
2
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2answers
1k views

Protocol for WiFi network to connect to a website?

Ok, I'm trying to wrap my hands around communicating over WiFi using a microcontroller. There seem to be various options such as UART, SPI etc. If I want an Arduino to get or put content on a website,...
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2answers
1k views

VHDL: receive module randomly fails when counting bits

Background This is a personal project; it regards connecting an FPGA to a N64, the byte values that the FPGA receives are then sent through UART to my computer. It actually functions pretty well! At ...
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4answers
1k views

Lightweight Arduino network comms

Is there a lightweight networking framework to facilitate network communications between Ethernet/Wireless enabled Arduinos and Linux/Mac/Windows PCs? Implementing something like being able to read ...
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2answers
820 views

Which microcontrollers that can I buy to learn such an USART, UART, RS232, USB, SPI, I2C, TTL communication? [closed]

I have a high interest in learning such an USART, UART, RS232, USB, SPI, I2C, TTL communication. I find some detail explainations about above communications in this link And I want to have deep ...
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1answer
997 views

Arduino IR remote NEC control

I'm trying to build a generic IR remote controlling device using an arduino. I've done some investigation to discover the IR protocol used by my NAD SR8 remote controller. I've connected a simple ...
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2answers
761 views

Analyzing the Protocol

I am trying to understand a protocol (shown in figure 1) . For now this I have understood that data is transferred at high to low clock. as shown in figure. and the sync is for every 8-bit. But then ...
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1answer
236 views

Implement IR protocol using only one timer

I want to implement the transceiving part of an IR protocol for my Samsung remote on an nRF54822, using an ARM Cortex M0 core. The protocol is very much like the NEC Protocol, and is using a carrier ...
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5answers
3k views

variable-speed focus PTZ protocol

I'm building camera systems to mount on top of a TV tower. When storm clouds roll, in the video is displayed on the TV weather report. No one wants to climb the tower to manually pan and tilt and zoom ...
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1answer
1k views

How to determine infrared protocol using PIC16?

I am trying to determine the IR protocol used in a Gree room air conditioner remote control. I connected the output of the original IR receiver to pin RA5 of a PIC16F73 and used the following code to ...
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1answer
7k views

How much max distance of SPI & USB & I2C and TWI(without any IC [closed]

How much max distance of SPI & USB & I2C and TWI(without any IC(my mean is directly)), and how can i amplify these?
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6answers
11k views

Good RS232-based Protocols for Embedded to Computer Communication

I'm working on a project that involves a good bit of data communication between a remote Arduino and a computer. The wireless connection is through a pair of XBees, so we have a RS232 link between the ...
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1answer
824 views

Difference between Ethernet and USART? [closed]

As i made literal study about protocols, I came across lot of protocols and there differences but i'm not sure of what is the major merits of Ethernet over USART. lots of websites explained about all ...
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2answers
605 views

Best microcontroller electrical bus for high speed synchronized sampling from slaves

I have an application which requires that I sample a dozen of sensors for each node and transmit the data to a master microcontroller in regular four second intervals. The surface area of the sensors ...
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1answer
729 views

Connection between RPi and PIC [closed]

Before I start I would like to say that I'm a complete novice with microcontrollers and would like to be treated as one and receive answers acordingly... more like "Q: How many legs does a human have? ...
3
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2answers
98 views

Rationale for interleaving in G.709

According to the ITU-T G.709 (OTN) specification, a single frame has 4 'rows' and 4080 'columns' of octets, arranged like this: ...
2
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4answers
4k views

I2C combining read and write operation

I'm designing my own data protocol for communication between PICs, ICs, etc. and in the specification I'd like to compare it to the existing I2C protocol. There are two types of operation on the I2C ...
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3answers
1k views

Why is the data output of some ICs in two's complement form?

I've been looking into some ICs now. Some of them have the calculated result (data) in twos complement form, placed in register to be read by other IC. What is the logic behind converting the data to ...
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3answers
256 views

Determining command constants for serial protocol design

It seems to happen fairly often that I'm working on a system that incorporates a serial (SPI or async) command set. As such, I generally have to put together a set of arbitrary command byte values ...
2
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1answer
825 views

Bluetooth SPP (Serial Port Protocol) and Cobra Tag

I have been trying to build something similar to the Cobra Tag (Check out the video). I have written a prototype android app which uses SPP to connect to a bluetooth module and exchange commands, ...
2
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1answer
1k views

How do you make the LEDs come on for a PS/2 keyboard?

I'm making a simple console type thing for the mbed with a PS/2 keyboard and VGA monitor. I have a PS/2 library working and can receive scancodes and such. I want to go above and beyond what it allows ...
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1answer
41k views

How do volume control headphones work?

A recent question over on Android Enthusiasts got me to wondering how volume control headphones work. I don't mean volume control which works by attenuating the incoming signal, but the kind of ...
3
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2answers
542 views

Sniffing USB traffic at the hardware level

I've been looking to purchase a USB sniffer that will parse packets at the hardware level. I've used usbsnoopy and the like, but a filter driver solution is not my ...
4
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4answers
154 views

What is the point of “software data protection” in a rewriteable ROM?

I've been considering trying to hack an old '98 era motherboard. The ROM(I presume for the BIOS) is a Winbond W29C020-70. In it's datasheet, there is a thing called "Software-protected Data Write". ...
3
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6answers
290 views

Hard drive that has the ability to “read” old data while it performs a write?

Is there a hard drive (protocol command, specific model, etc.) that, while writing new data over old data, it "read"/return the old data back to the controller/OS? (Analogous to a simultaneous read-...
4
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2answers
2k views

XBee, how does it deal with collisions?

I'm getting started with XBEE S2 modules and I have a doubt I still couldn't get a clarification, hope you guys can help. I want to have 2 end devices transmitting data to one coordinator, all of ...
2
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1answer
2k views

Do PS3 controllers use SPP to send the state of the buttons?

I am making a little Arduino circuit, and I would like to use a PS3 controller to control my project (for now). I know there are things like MotionJoy for PC, but how does this software work? Would ...
2
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1answer
530 views

Understanding the OSI Model

I'm currently documenting a wireless, microcontroller-based system that I've built and I would like to use the standard industry terminology to help anyone who comes behind me comprehend it easier. ...
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1answer
99 views

Industrial Networks [closed]

I have been trying o figure out the differences in the several fieldbus protocols used in control networks in industry, what are they?
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2answers
980 views

What is a multiplexed network?

What is a multiplexed network? Multiplexing means many to one and sending the result over the network. As far as I know, Control Area Network (CAN) supports multiplexing. How? CAN is said to support ...
4
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1answer
4k views

Can anyone identify this 433Mhz OOK protocol?

I am working with some wireless devices that use 433MHz OOK transmitters and receivers. They use a simple protocol for the data sent between the nodes. I feel it is reminiscent of common IR remote ...
11
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6answers
59k views

What is the difference between Ethernet and Serial communication?

All the mouse movements, USB connections and other PC peripherals such as printers etc. are what is called serial communication. One bit per time. So far so good. But when it comes to TCP protocol, ...
2
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2answers
181 views

Data transmission : what is neutral current method?

I'm reading a book about data transmission inside a PC. I'm trying to understand a phrase, translated from german, saying this : In a PC, data are transmitted almost exclusively using the so-...
5
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6answers
7k views

Manchester encoding

As I understand, in Manchester coding known bits are sent before start a transferring. But I didn't understand why - One of the main benefits of Manchester, is the fact that sync between the two side ...
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6answers
4k views

Is it possible to make a USB device that would alter mouse data on the fly?

I have a friend who is struggling to find mouse drivers/manufacturers that support various options for dyslexia. Inverting the X and Y axes are a simple feature that most programs and drivers are ...
2
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2answers
9k views

SIM card communication protocol

My board contains an STM32 (manual here) and a SIM card reader (manual here). I need to write drivers to test that the SIM reader is working an properly communicating with the STM32. However, looking ...
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2answers
538 views

VSAT link between station A and B bandwidth is limited as QPSK modem 4096kps?

I'm finding it difficult to solve this problem and I am hoping y'all can help me with it. How can I optimize a VSAT link for maximum data throughput from a station A to B knowing that our measured ...
5
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2answers
1k views

Transmitting ASCII 'A' over SPI Protocol

I'm working on a project that involves connecting directly from the TRS jack of an iPhone to a SPI port on a microcontroller. So the iPhone is the master and the microcontroller is the slave So let'...
1
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1answer
475 views

motion detected protocol

Is there a standard protocol for motion sensors, PIR sensors, etc. to tell parking lot lights, etc. that motion has been detected, so the lights need to turn on? I'm not asking for protocols that ...