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Questions tagged [synchronization]

the coordination of events to operate a system in unison.

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3answers
8k views

How do GPS satellites refresh their clocks

How do GPS satellites keep their on board clocks accurate? I assume that they need to get update from a base station. But how do you make sure that after the update all the satellites are synchronized,...
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2answers
7k views

How does 2-ff synchronizer ensure proper synchonization?

Using 2-ff synchronizers has been a standard for a signal to cross clock boundaries. And there are lots of paper/figures illustrating the mechanism, such as this one: It seems bclk can only sample ...
8
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2answers
1k views

Why do we need to synchronise asynchronous inputs in FSM?

I have been newly learning digital electronics. I know that there are gates which perform logic functions, I learned about RS-Latch, D-Latch and Master-Slave-D-Flip-Flop. Now that I can perform logic ...
7
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3answers
15k views

How to synchronize a generator on the electrical grid?

I've read many articles about paralleling two portable generators or synchronizing a power generator on the electrical grid. I have the theoretical background about that topic and I know the four ...
6
votes
3answers
882 views

gps performance for synchronization

I can't understand why GPS reciever clock is very good (stratum 0). I know it's very accurate and pure within itself; but when it passes through a long distance wireless channel, then it has low power ...
5
votes
4answers
2k views

In one-way asynchronous serial communication, how does the receiver sync up its bytes?

I want to make a serial system over RF to receive messages sent from a computer, so I can understand how digital radio works on the bare metal. The one part I don't understand is how a sender and a ...
5
votes
2answers
804 views

Metastability error propagation with flip flop

I do have a confusion regarding the metastability resolution using flip flops , I know that I should add synchronizer of two or three d-flip flop to guarantee a safe transmission at clock domain ...
5
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2answers
2k views

Camera Synchronization

I'm interested in having two or more cameras precisely synchronized for machine vision purposes. All the global shutter cameras I've seen basically have two modes: free-running, with a maximum frame ...
3
votes
4answers
794 views

Is there an efficient way for synchronising audio events real-time with LEDs using an MCU?

I'm working on a project in which LED lights synchronise with audio events. I'm not referring to reactive LED projects that read the ADC from audio amplitude or spectrum, but about having some ...
3
votes
1answer
113 views

Are Newfoundland's and Quebec's power grid synchronized [closed]

By the Maritime Link project (HVDC), which finished this year, Newfoundland is linked asynchronously to Nova Scotia, which is part of the Eastern Interconnection. But is the power grid of ...
3
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4answers
2k views

Synchronizing a diesel generator with a pure sine wave inverter

As the title reads, I'm trying to understand the best (Practical) way to synchronize a diesel generator with a pure sine wave inverter, in order to implement an automatic synchronizer based on ...
3
votes
3answers
711 views

methods for servo or stepper synchronized multi-axis control [closed]

I have designed a 6 axis robot. The main requirement of the robot is that all axes must be highly synchronized in order to create precise (sub-millimeter, sub-degree) 6DOF (x, y, z, yaw, pitch, roll) ...
2
votes
1answer
312 views

How are two atomic clocks synchronized?

I want to synchronize two atomic clocks at the same location to the same time... then let them run independently of each other (then I'd move them apart). Is there some standard procedure to ...
2
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3answers
76 views

Clock domain cross and metastablilty problem

I understand the problem of metastability and understand that we can't get a stable value in a bounded time so we need unbonded time but it is not practical, so we put another flip flop with no ...
2
votes
2answers
445 views

How to use 1PPS to Synchronize ESP32 Clocks and Peripherals

I've read a few posts (example) about what the 1PPS signal is and how it can be used at a high-level, but I'm still not sure how to actually implement it on a PCB schematic to sync up with my ...
2
votes
1answer
280 views

Simple questions about synchronizer

1) For table 1 of Berkeley paper , why "Input must be valid for at least two clock periods in the new domain." ? The explanation: the width of the input pulse must be greater than the period of ...
2
votes
2answers
82 views

Strange voltage decay with clipper

I need to limit the voltage coming out of the sync function on my radio signal generator so I can plug it into my laptop's audio input. This is what it looks like without any voltage limits: I used a ...
2
votes
1answer
132 views

How to design a transistor current switch for synchronization circuit?

The following diagram is a practical diagram for derivation of the clock signal from the received waveform itself (Synchronization) in baseband PAM systems. I'm looking for a typical circuit for the "...
2
votes
0answers
78 views

Offset QPSK Frame sync markers

What actual protocols exist out there that employ Offset Quadrature Phase-Shift Keying (OQPSK)? What do they use for the frame synchronization marker (or "preamble" or "sync word" or "flag")? Do ...
2
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3answers
82 views

Deciding which assembly is more common positive edge detector

I know of two circuits which can act as edge detector: A clock connected as a voltage source across a RC component where resistance is composed of a diode and a resistor and this in series with ...
1
vote
3answers
152 views

Can I use the external trigger to simultaneous capture waveforms on two oscilloscopes?

I want to look at synchronization in a 6 oscillator network (oscillators are about 100 kHz, 1.5 V_pp, if this matters). I have a 4 channel oscilloscope (Tektronix TDS 2024B) and a 2 channel ...
1
vote
1answer
853 views

Why is the CAN bus always busy (microcontroller)?

I'm trying without success to perform CAN bus communication between an microcontroller and the host (my computer). My question does not depend on the microcontroller, but on the CAN Bus (classic CAN). ...
1
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2answers
137 views

What does Timestamping of GPIO pin means and how to achieve it?

I did my bachelor's in CS and I am pretty new to electronics and with embedded system as my specialization, I am not able to grab some of the concepts. I have made a program which toggles an led on ...
1
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1answer
52 views

Broadcast Audio Synchronization

Unlike other broadcast standards such as DVB-T where the transmitter sends a reference TimeStamp counter (CTS,PTS) as a global reference clock information to receiver, in digital radio standards such ...
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0answers
40 views

Shift composite image right

The circuit is based on AD725 encoder, and the proto board is functioning relatively well. Here're the pics: NTSC mode: PAL mode: Circuit detects PAL or NTSC mode using MCU, and performs automatic ...
1
vote
1answer
245 views

Video sync generator IC

I have a board which is a PAL CCIR video sync generator card having SAA1043. The IC is accepting external sync signal from pin 15 and generating composite pulse on pin 26 and burst output on pin 1. ...
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0answers
35 views

Wireless Time Synchronization IC [duplicate]

In my application I need a clock that is synchronized across several devices. (A detailed description of my system is given in an earlier question) It appears achieving precision timing at a software ...
1
vote
1answer
51 views

Migration from multimode to single mode fiber

In my company we are using custom measurement systems with multimode fiber optic transmitters and receivers for synchronization between different devices. We are thinking of migrating our multimode ...
1
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0answers
965 views

how can synchronize two single phase generators?

I need to a continues power supply for 3 day without interrupt. I use from 2 single phase generators that a generator work for 10 hour and next another startup. for uninterrupted power supply we need ...
1
vote
1answer
637 views

Synchronize internal DAC to I2S on STM32F4

I have a CS4344 DAC connected to my STM32F407 outputting sound at a 44.1kHz rate with DMA and I2S and I would like to output and envelope signal through the internal DAC of the STM32F4, in sync with ...
0
votes
3answers
205 views

How does async data transmission actually work?

I think I understand synchronised data transmission between A and B. They share a synchronised clock signal that indicates when the transmitter is sending a bit and the receiver should read the value. ...
0
votes
1answer
151 views

Can I use GPS to synchronise two pieces of hardware? [duplicate]

I'm working on a project with multiple sensors. These sensors need to be synchronised with eachother as precisely as possible without a physical connection. I need to make sure that if I tell them to ...
0
votes
3answers
170 views

Synchronizing two OV7670 image sensors

I would like to create a simple frame synchronihed stereo camera. I found there are cheap OV7670 boards (without FIFO memory) that work with Arduino (or compatible) boards - these sensors do not have ...
0
votes
1answer
76 views

Sync with electrical wall outlet [closed]

I have two ac souces one being the electrical wall outlet and the othee being an inverter that will go to zero volts, and both at 60hz. How do I sync the inverter to the wall outlet?
0
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2answers
137 views

Synchronize Clocks

I need to develop a system where there are 4 sensor boxes powered by USB and they have their internal clock. Each of these boxes are connected to a Linux pc and all these PCs are linked with WiFi. API ...
0
votes
1answer
100 views

Maintaing Data Packet Wholeness Over RS-232 Serial Port?

This might seem a bit simple, but when I'm reading data sent from over RS-232 to be read by my computer, is it reasonable to expect that if the data was sent as a single packet, that the packet will ...
0
votes
3answers
1k views

Getting Clock/Time information from PC to an STM32F4

Assume I connect a microcontroller board (like an STM32F4) to a PC via USB. Is there anything in the USB communication protocol that contains host clock data? In other words, can I sync the ...
0
votes
1answer
92 views

Drift auto-corrector for any microcontroller [closed]

I've made multiple microcontroller circuits in the past, but now when I look at everything, drift has become a problem. I know this when I try to connect two micros together serially via wireless ...
0
votes
2answers
92 views

Compensating clock drift “by hand” - what have I solved?

Edit: I'm not actually looking for a solution, because short of syncing the hardware clocks (which I can't do) there isn't one. What I'm looking for is an explanation of where the magic -8.4ms I seem ...
0
votes
2answers
158 views

BTLE synchronize advertising beacons with phone scanning

In a BTLE master/slave connection, the master and slave devices synchronize their frequency hopping. Along with the connection parameters (like interval, slave latency, supervision timeout) this ...
0
votes
1answer
186 views

Radio clock sync circuit identification [closed]

I took out a little board from a radio clock that looks a lot like this one. I believe this is used for automatic clock setting - the coil is probably used as an antenna. It looks like this: The ...
0
votes
3answers
272 views

Syncing 50+ wireless sensors

I am creating a set of 50+ remote imu sensors. They will all be in a small distance from one another. Less that 3 meters. Each remote board will have a on board sd card for logging the imu data and a ...
0
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2answers
1k views

GPS 1 PPS Aligment Clock Signal Generator

i want to do GPS 1 pps aligment clock signal generator. Clock signal should be at 24.576 Mhz and voltage level Vmax= 3.3 V and Vmin=0 V DC. How can i do that? It is very important to align between GPS ...
0
votes
1answer
87 views

Clock synchronised to pulse

I'm thinking about 1Mhz clock signal synchronised to external random pulses (eg. rising edge). Before pulse event clock can be running or stopped. After every pulse, it should run in same fixed phase ...
0
votes
1answer
146 views

synchronise many microcontrollers

In my project i'll use modbus protocol for serial communication over RS485. There are more than 320 slaves which seperated equally in 2 groups. Every 16 slaves are powered from the same supply and ...
0
votes
1answer
360 views

Should we use asynchronous inputs in Moore blocks and synchronous in Mealy blocks?

Consider we have two n-bit counters CNT_A and CNT_B two n-bit unsigned comparators CMP_A, CMP_B and two n-bit binary numbers N1, N2. The counters have two inputs C, L for synchronous count and load ...
0
votes
1answer
1k views

How to Sycnhronize STM32F4 Clock with PC Clock

I'm using 3 STM32F401RE to synchronize their clocks. My desired accuracy is of 1ms and even lesser like 0.1ms. This device is connected to PC via USB port. Question 1 : So I would like to know if I ...
0
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0answers
177 views

How it is possible to synchronise sensors?

I am wondering how sensors are usually synchronized in time. I would like to synchronize two sensors in order to be sure that at every time-stamp both of them are giving me a measure. What I saw that ...
0
votes
1answer
33 views

Ethernet PHY clock and sync

I have a general question about reference clocks for ethernet PHYs. The PHYs I have seen so far require an external clock source like a xtal or other singleended clock (in addition to the clk lines ...
0
votes
0answers
26 views

Generator data for synchronizing

I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work ...