In serial communication data is transmitted as a sequence in time. Main advantage: much less wires needed. Main disadvantage: Higher bandwidth for the same throughput.

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3answers
65 views

What is the maximum number of bytes that can be sent through USB-to-serial COM port at one go?

Suppose someone uses hyper-terminal to send a very long ASCII string at a COM port. This COM port is created by FTDI USB-to-serial port cable. The cable used is ...
0
votes
1answer
36 views

6Mbaud UART with Bus Pirate V4

I would like to sniff data on an SPI bus running at a clock rate of 6 MHz. I would like to use the Bus Pirate V4 for this task. The sniffing itself is supported up to 10 MHz, the problem is getting ...
0
votes
2answers
67 views

How do I tell a serial port settings, when the hardware documentation doesn't have any info about it?

Trying to get a program to work with a serial port, but there is no serial port configuration settings given. I have an old hardware board (a Stanley MC521 Controller) from late 1990s I guess. It ...
1
vote
1answer
40 views

AtTiny84 with USB

I am having some problems with the ATTiny84 and USB. I am creating an "arduino clone" but I want a simple (and especially compact on the board) way to implement a USB serial interface. This will only ...
0
votes
1answer
34 views

FT232RL TX/RX Direction

I want to basically embed an FTDI cable in my board to avoid confusion with the RX/TX pins, wrong cable, etc. I really want to make sure I choose the direction correctly though. I have ...
0
votes
0answers
25 views

Bluetooth serial to bluetooth audio module

I was looking to work with a bluetooth audio module but many of the available options are either very costly, unavailable in my region(India) or generally lack some features. What is commonly and ...
1
vote
1answer
34 views

Stm32f429 usb cdc to pc

I want to put together a simple library to communicate between stm32f429 and pc via usb cdc vcp. I noticed many examples from stm create a usb uart bridge on the mcu. I am trying to understand the ...
0
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0answers
51 views

Serial Device has intermittent behavior [closed]

I am developing a windows application that communicates with a vending machine. The communication has been successfully tested, regardless there seems to be a problem when I try to automate the VEND ...
1
vote
1answer
52 views

Send alert tone to pc from microcontroller via serial communication

I am learning microcontroller for couple of weeks. Yesterday, I have learned how to establish serial communication between PC and microcontroller. I can send texts to pc's hyperterminal from mcu and ...
1
vote
1answer
43 views

How do i turn multiple usb ports off based on multiple sensors

I'm looking for a way to turn a usb port on an off from an Arduino, I'm looking at purchasing something like this and somehow using a pressure or light sensor to turn the usb port on and off. I was ...
0
votes
2answers
43 views

How do I wire a 9 pin serial connector into a RJ11 4pin connector?

I am working on a project, the door control system I am using is a bit old, and it works through a serial connector on a 4 pin RJ11 line. I am currently trying to wire an old serial wire into its RJ11 ...
0
votes
1answer
21 views

8-bit Serial I/O Parallel I/O Bi-Directional Shift Register [closed]

I am looking for a register that has as stated Serial In Parallel Out and Parallel In Serial Out modes and bi-directional shift functionality all in one IC. I want to use it with Arduino. Does ...
0
votes
0answers
23 views

Arduino ADK, other board, shield or what? [migrated]

Sorry for bothering. I have a problem with my project and I can't fine someone who can help me yet. I need the next configuration: PC --------------USB cable-----------------MegaA---------------USB ...
0
votes
0answers
6 views

Using Multiple Serial Ports with arduino nano [migrated]

I am using a arduino nano to control a adafruit ultimate gps and a xbee wireless controller. However I recently ran into a problem using both at the same time (before I was using each separately until ...
0
votes
0answers
5 views

arduino-processing serial comunication - loosing data? [migrated]

I'm trying to send an array back and forth between Processing and an Arduino UNO. But I think there is being data lost along the way. I simply iterate over the array in Processing and send the Values ...
0
votes
0answers
26 views

How to wire this pn532 board to usb to serial converter?

I want to connect this board: To this Bus 001 Device 003: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter Which syslog says is ch341-uart converter (with a DB9 connector). On db9 ...
0
votes
0answers
8 views

Arduino Serial Monitor shows strange ASCII characters [migrated]

I connected an ArduiMU v3+ via a FTDI-cable to my Mac (OS X 10.10) (latest VC FTDI driver is installed and loaded). Inside the Arduino-software the Serial Monitor (monitoring ...
0
votes
3answers
66 views

What is a 3 wire type cross linked serial cable?

I'm trying to use a controller which uses Serial communication with the PC. The documentation says I need to get a 3 wire type cross link serial cable. Is this a null modem cable? The following ...
2
votes
2answers
55 views

Serial XOnXOff handshaking

I have the following code running on an atmega328 (ArduinoUno). ...
15
votes
7answers
2k views

Why is serial EEPROM preferred over parallel EEPROM?

In the wikipedia page for EEPROM: http://en.wikipedia.org/wiki/EEPROM it is given that "Parallel EEPROM devices typically have an 8-bit data bus and an address bus wide enough to cover the complete ...
0
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0answers
42 views

Help Designing Microcontroller 2xRj45 (RS232) + 1USB-Serial

I am trying to design a microcontroller that will have 2xRS-232 RJ45 ports (not PoE, just serial communication) and a 1xUSB Type B female (for 5V power and programming). I am not exactly sure, but ...
0
votes
1answer
37 views

How to transfer data between RS-422 and RS-485 ports? [closed]

I'm relatively new to behaviors of serial ports such as RS-232, RS-422, and RS-485. I'm wondering how do you initiate data transmission between a system and a device connected to each other thru one ...
2
votes
2answers
139 views

AC-coupling capacitors for high-speed differential interfaces

Can you explain me why and where I should put AC-coupling capacitors (usually around 0.1uF) on high-speed (1...5 GHz) differential serial interfaces (like SerDes for Gigabit Ethernet SFP modules)? ...
0
votes
0answers
44 views

Why is flow control adding bytes to my data stream?

I'm working with an mbed LPC1768 microcontroller and a BLE112 Bluetooth LE Module. I wasn't able to get the two to communicate, and I had a hard time figuring out why. However, when I hooked it up to ...
1
vote
2answers
125 views

I2C Module Not Responding

I am writing a basic I2C slave as part of my code on a 20-pin 8-bit PIC16f MCU. As best as I can tell, this microcontroller has a module that watches the I2C bus and only updates my registers if there ...
1
vote
1answer
67 views

Advantages of parallel over serial connections

As far as my understanding goes, parallel data connections are faster than serial at the same frequency. However, when you increase the frequency in parallel you start getting bits 'cross-talking' and ...
0
votes
0answers
18 views

What IRQ to use for USART transmission handling under SAM3x8e?

I've made the USART support for SAM3x8e arduino based board. The MCU has TXRDY, ENDTX, TXEMPTY, TXBUFE interrupts. What would be the best choice to be used in IRQ driven transmission handling? Now I ...
0
votes
0answers
29 views

SCL pin of MPU9150 not generating clock

Platform is Arduino Uno.I have worked for the whole day long and still could not access anything from MPU. I tried for the Arduino playground code as well as github code. Arduino playground code gives ...
0
votes
1answer
41 views

How to setup SAM3x8e IRQ handler for USART?

I'm making UART support for SAM3x8e based Arduino Due board. I would like to clarify questions I can't resolve by searching the web. Is it only one IRQ handler per MCU component like USART? This ...
0
votes
0answers
24 views

XBee Packet Buffer

I have an Xbee Pro Series 2. One is set as the coordinator and one as an end device. If I manually send a packet containing a one byte payload from the coordinator to the end device, I get an ...
1
vote
0answers
113 views

Serial AT commands with Bluetooth CSR8645 module

I bought a Csr8645 (bleutooth audio module). The module connect to my phone out of the box... It should support some AT commands. So I have tried some but I don't get anything in response. The only I ...
0
votes
0answers
24 views

XBee Pro 900 RPSMA not detecting

I bought 2 XBee Pro 900 RPSMA from Sparkfun.One of them is detected by XCTU but same other one is not detected by XCTU. so I tried recover faultly one by seeing this video ...
0
votes
0answers
23 views

Why are RI and DSR signal combined in TIA-561 (RS-232 over RJ-45)?

EIA/TIA-561 is the standard for transmitting RS-232 signals over an RJ-45 modular jack instead of the more familiar DB9 connector. I'm getting most of my information from here: Zytrax They have this ...
0
votes
2answers
118 views

Is it possible to send AT commands through TCP?

I have a SIM900 GSM/GPRS device, I can send AT commands through HyperTerminal and everything is fine. I can configure GPRS connection through AT commands: ...
6
votes
1answer
150 views

How serial resistors actually reduce EMI?

I am recently working with a GSM based system, and there was this advice in the datasheet of the GSM module: 22Ω resistors should be connected in series between the module and the SIM card so as ...
1
vote
1answer
48 views

Connect kindle 3 serial port to epson printer's 8 pin mini-din serial port?

I have a kindle 3 with a broken screen and an old EPSON stylus 1520. The kindle has a serial port with TX, RX, GND and 1.8v VCC (source). The printer has a mac compatible 8 pin Mini-DIN port. Would ...
0
votes
0answers
50 views

Programming FT232RL with ft_prog

I recently bought an FT232RL module and am trying to use it in one of my projects. I want to change the USB descriptors to be my company and description, but FT_prog is not working. It discovers the ...
1
vote
5answers
294 views

Low cost simple communication between two microcontrollers

What tradeoffs and connection options are there in low cost bidirectional communication between just two microcontrollers? In this case: Master/Slave relationship, bidirectional data flow Distance ...
0
votes
1answer
67 views

Can I use serial communication for audio amplifier remote turn on?

I have a cheap Chinese tablet/GPS/dash-cam in my car. The problem is that I can't hear driving instructions on GPS as the volume is too low. I don't want any external wires for additional speakers and ...
0
votes
1answer
60 views

Alternative to AM and FM transmitting for data transmission?

So, I need to communicate wirelessly between a micro-controller and my computer. I'm building a radio receiver circuit, and a radio transmitter circuit that works on FM transmission. However, I had an ...
-2
votes
1answer
56 views

Serial Counter in digital electronics [closed]

What exactly is a serial counter in digital electronics? Someone told me it is a way of to design a counter with shift registers and some combinational circuit to obtain s counter that operates ...
0
votes
3answers
142 views

How to send string in serial communication in AVR-C

So as the title states, instead of sending a byte of information at a time, I would like to be able to send a whole string. What I tried to do was that I tried to put the user input in an array and ...
0
votes
1answer
87 views

One wire (+GND) serial communication. How to have a correct coupling?

I'm a firmware developer more than a hardware designer. I've a doubt about an idea of mine. I want to obtain serial communication between eight ATtiny85 (slaves) and an ATmega168 (master - It might ...
1
vote
1answer
50 views

UART: two transmitters, single slave

simulate this circuit – Schematic created using CircuitLab My circuit is shown above - where I have the TXD pin of an ATMEGA connected to the RXD pin of a BT slave. Both devices operate ...
2
votes
2answers
115 views

Serial data received in wrong bits

I have an RS422 interface set up between an Arduino and a custom-built device. The device is set to transmit a 16-bit header, followed by 66 bytes of data, at a baudrate of 460,800 and at 200Hz. This ...
0
votes
1answer
54 views

Atmega328P FTDI 5V USB Serial Communication

I am working a Atmega328P and FTDI 5V USB Cable to get a Serial Communication between the Micro-controller and the PC. I am using Tera Term for receiving out from Micro-controller. I am using an ...
0
votes
1answer
101 views

How to connect 3-wire spi with an arduino to the Maxim DS1801 digital resistor?

I just picked up an Arduino Due with the SAM3x 3.3v chip. I am attempting to communicate with a Digital potentiometer to control an amplifier's volume level but I have no clue how to go about hooking ...
5
votes
1answer
173 views

MIDI IN : many circuits

I'm building a MIDI IN to serial port RX cicruit (for Raspberry Pi, or Arduino, or anything else...) using a 6N138 optoisolator. But I find many different circuits, I don't know why there are so ...
1
vote
1answer
152 views

Additional TX and RX pins for FT232RL Microcontroller Interface

I'm designing a board that needs to be programmable via USB and external TX/RX pins. I decided to use FT232RL ( http://www.sparkfun.com/datasheets/DevTools/Arduino/FTDI%20Basic-v21-5V.pdf ) for the ...
1
vote
1answer
54 views

What are the considerations for choosing Bluetooth baudrate?

I have an Arduino UNO which will be using an HC-05 bluetooth module to connect to a program running on PC. Its baud rate can be configured from as low as 4800 to as high as 1382400. I know that there ...