Questions tagged [serial]

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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44 views

Can an ATMega328p be bricked such that it cannot be programmed but still works?

I cannot update the program on my ATMega328p-AU (with the old version of the Arduino nano bootloader burnt to it). Oddly enough I can still talk to the program running on the uC (query and read out ...
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3answers
65 views

How to read serial data from usb device using arduino?

I am pretty new to programming and electronics. I have a orion star 211 pH meter with usb and rs232 outputs. I want to record the pH change with time using an arduino but the first problem is reading ...
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1answer
39 views

Unable to drive MCU pin high

I'm trying to drive a MCU input with a RS-485 driver chip, specifically the SP3485 on the SparkFun RS-485 transceiver breakout. When I connect the MCU pin directly to the 3.3V power rail, the pin ...
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25 views

How do I set up serial communication between two Holybro Telemetry Radios?

I have two USB Holybro 915 MHz Telemetry Radios. These are usually used with Mavlink for communication between drones and ground stations, but I would like to use them to send small amounts of data - ...
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1answer
72 views

How to convert from 2 data line full duplex to 1 data line half duplex?

I'm trying to design a circuit that can convert from a two wire full duplex (think SPI), with one transmit line and one receive line, to a one wire half duplex (think i2c), with bidirectional ...
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0answers
124 views

Making own Chromebook debug cable (SuzyQable)

I wanted to debug my chromebook so I was looking for SuzyQable which enables to activate debug features on chromebook. Unfortunately this cable is hard to get in my location so after noticing this ...
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4answers
68 views

What is the exact difference between synchronous and asynchronous serial transmission?

I'm having a hard time understanding the exact distinction between synchronous and asynchronous serial because different sources have confusing description. For example, some source say a separate ...
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1answer
39 views

Reading UART from device that has floating ground

I am powering an ESP32 over a less-than-ideal power line, that has 4 Ohms of resistance. In order for 5V to arrive at the device, I apply 7V to the power line, such that when 250mA of current are ...
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How to store data in Keithley2400 buffer during measurements and retrieve through rs232?

I am trying to do an IV measurement (source current, sense voltage) store into the Keithley2400 buffer and retrieve the measured data (voltage and current) into my python program variable 'data'. <...
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1answer
52 views

Serial Communication between two Arduino not working [closed]

I'm trying to perform a simple communication sending two strings in two char arrays from an Arduino Uno to another one. My problem is that after the 5th or 6th iteration the two strings will mix. ...
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1answer
56 views

Which ASCII character could interrupt communication?

Which ASCII character could interrupt or terminate or otherwise disturb communication on the reciever part. Not including acknowledgment, handshakes, identification or other programmed protocols. ...
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1answer
62 views

Connecting Three 12V DC Water pumps to the same power source

I am new to all this and I am sure this is a very basic question, but wanted to ask before I fry some pumps up. I have a relay, which is controlled by my raspberry pi, switching the pump on and off. ...
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How to access Realtek SMI interface without a dedicated processor?

I'm working with Realtek's RTL8367 switch IC. Background: I am having trouble with throughput being unbalanced. If I run iperf between two ports in one direction I get a different throughput if I ...
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RS-485 Master -> Slave Arduino *not sending or receiving* **SOLVED - BROKEN HARDWARE**

I am using an arduino mega as a slave and arduino uno as a master in hopes to eventually make an ROV. But as of right now im having issues with getting the serial communication between the arduinos to ...
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2answers
82 views

Use half-duplex or full-duplex RS-485?

I have a master microcontroller that can control 4 slave microcontrollers. Each slave microcontroller is connected to 3 sensors. The master microcontroller asks to retrieve the value of a specific ...
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2answers
65 views

how to choose level shifters for serial / UART

I have so far been using some MAX3323EEPE chips for shifting between 3.3V and 5V logics on serial / UART communications. This is quite some stuff to solder on a PCB, and the chip is a bit expansive. I ...
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53 views

How to identify the serial console port pads on device

I want to identify the serial console port pads on the board. The place for male header connector(yellow arrow) have 6 pads. Usually it’s not difficult to identify Rx, Tx, GND pins with a multimeter, ...
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1answer
55 views

Multiple UART devices on Raspberry Pi

I want to connect multiple devices which are communicating through UART to Rapsberry Pi3b+. Given that Raspberry has only 1 set of Tx-Rx pins, I am unable to do so. I am designing a PCB so I have the ...
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1answer
20 views

NRF Uart With sim868

I have a problem in the UART communication between NRF52832 and SIM868 module. The problem is the data sent by NRF doesn't be interpreted by SIM868. To see that i did tow tests: First one, I added ...
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3answers
91 views

How does the UART communication detect the true idle in this case?

When explaining UART communication it is told that the receiver will start sampling the data one start bit after the first falling edge. The falling edge occurs when TX goes from idle state to zero as ...
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1answer
39 views

How to get a serial reading from an Ultrasonic Rangefinder on a Raspberry 3 B+?

I'm trying to set up a Maxbotix Ultrasonic Rangefinder (LV-EZ0) with a Raspberry Pi 3 B+. I've tried all the tips I could find: raspi-config disable serial interfacing for shell, but keep it on ...
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1answer
57 views

WAVGAT Pro Mini, no serial output

I ordered some Pro Minis however get some WAVGAT clone thingies. The first problem was it is running too slow (4x slower) when compiling with default "Pro or Pro Mini" board profile. Serial however ...
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3answers
4k views

UART signal is “rounded”

I am trying to debug a UART driver for the STM32F405. It does not work above a certain baud rate (about 50 kBd). I connected it to a logic analyzer with analog capability, and I saw that the signal is ...
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1answer
85 views

Problems with UART in ATmega

I've been programming my atmega 328p to automate my coffe machine. The timer is set using the bluetooth module HC-06, or by a set of configuration buttons that I'm gonna develop yet (the full code is ...
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1answer
73 views

Garbage on RS232 and no the baudrate IS correct

I have a device like this https://www.vaisala.com/sites/default/files/documents/WXT530-Users-Guide-M211840EN.pdf. Some facts: I have an FTDI to USB board from Sparkfun which is tested to work with ...
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1answer
65 views

DB9 to Serial Connection - Unknow Configurations

I have a DB9 to Serial Connection and I am wondering if there is a name or a standard for this configuration. So that i do not have have to make it every-time. I made a diagram, (stock image: ...
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2answers
157 views

Hardware/software needed to decode Differential Manchester?

I have a differential manchester encoded 0 to 5v data stream at 62500bps. What hardware do I need to get this into something I can work with, ie arduino, pi, etc? I have searched for chips/eval ...
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1answer
63 views

What Is The Correct Way To Recombine A Split Serial Signal?

I am trying to replace the lamp and ballast assembly in an Acer P1500 DLP projector. The ballast is an OSRAM PT-VIP-05 COMPACT. It features a UART control scheme that allows the motherboard to query ...
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1answer
86 views

Steal 5v from USB Module in 3v Mode

My project includes an ESP8266 (runs at 3.3v) and a USB C-Serial breakout. The USB module can optionally run at either 5v or 3v, and there's are solderable jumper pads to make that switch. Here's ...
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1answer
77 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
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0answers
164 views

Failed to connect to esp32: timed out waiting for packet header when flashing

I have using an esp32 wrover b chip, an esp32 adapter, and a USB-serial converter. I am trying to flash micropython onto the esp32 via the usb-serial connector, but have encountered a few connection ...
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1answer
47 views

Read serial data from unknown source using Raspberry pi

I have a fuel dispenser, which has one keypad and two displays, each display has three of 7 segment LCDs. I want to control the fuel dispenser with a PC or a phone. The way to do this in my knowledge ...
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0answers
19 views

ESP8266 auto-program circuit with DTR only and without RESET pin (turn off>on VCC only)

In the NodeMCU board, there's a very usefull auto-program circuit to avoid pressing buttons or change wires. This is the schematic: I have some ESP8266 already soldered on PCB and they does not has ...
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0answers
54 views

How to connect to the PCB of an Alcatel Linkhub HH40

I recently bought an Alcatel Linkhub HH40 4G router. Unfortunately, the web interface doesn't provide the functionality I was hoping for (e.g., automatically disabling the radio functionality over ...
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1answer
76 views

is it possible transfer an image via rs-232 serial-port cable? [closed]

*I want to take an image from a medical device. Should I take the data first and then visualize it in pc via another program?
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0answers
40 views

Issue regarding TX line of Arduino while communicating with Vending machine via MDB Protocol over USART

I am trying to communicate with a Vending machine using MDB Protocol with the help of Arduino Mega and I am partially successful in doing so. The circuit that I am using is attached here While the ...
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2answers
150 views

Anyone know this serial bus waveform?

I'm working decoding some house intercom devices to know when someone is calling and also be able to open the door. To do this I buffer the signal (some models has 15v, others 24v...) to a 3v3 level ...
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1answer
69 views

Question about 74LS164 8-bit serial in parallel out shift register

With the 74LS164 8 bit parallel out serial shift registers, I'm confused about a few things. In the datasheet (page3) on the logic diagram why do they suggest using an active low inverter before the ...
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1answer
49 views

How would I connect an HC-06 bluetooth module to an SN75176A RS-485/422 transceiver?

I am trying to fashion a small module that would allow me to connect to an RS-485 system via Bluetooth. I have found that the potentially cheapest solution would involve an HC-06 TTL Bluetooth ...
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1answer
77 views

RS232 Modbus to USB wiring

I have a RS232 device that sends data following the modbus protocol. I have problems communicating with it and I think my wiring is wrong. Since most modbus devices work over RS485 it is hard to find ...
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3answers
79 views

What makes a communication architecture/protocol faster than others?

Why is thunderbolt considered faster than other? Apart from the inherent channel properties which affect the speed of data propagation, what else determines the speed of data transfer? Of course ...
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1answer
61 views

Why is a LIN cluster limited to 16 nodes?

It says everywhere that a LIN network can be made up of at most 16 nodes (1 master node and up to 15 slave nodes). The id field however is 6 bits long allowing for more than 15 slaves to be addressed. ...
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1answer
41 views

SDLC Frame Check Sequence details

In the Synchronous Data Link Control (SDLC) protocol, the frame contains a "frame-check-sequence" (a CRC). The protocol contains a number of other implementation details, such as NRZI encoding, and ...
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1answer
208 views

The SERDES/transceiver design inside the Ethernet MAC controller

I'm a little confused about the "SERDES" interface between MAC and PHY chip, and I drew some figures to illustrate the connections which confuse me as shown below. The MAC controllers in 3 figures are ...
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1answer
78 views

4-bit memory serial to parallel memory register circuit question

I am building a 4-bit serial to parallel memory register and I feel like so far I have gotten things right, but I'm unsure of where to connect the CLR connections. Could someone have a look at my ...
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1answer
35 views

RS232 Serial Console: Do we receive serial packets at serial pin out from CPU even we don't have the console cable connected?

What if I don't have the serial cable connected to the serial port, still I receive serial packets from CPU? (lets say console output is enabled in Software) Will those packets got terminated (...
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0answers
23 views

Determining the Directionality of Communication when Reverse-Engineering an Unknown One-Wire Interface

I have an automatic digital control system that collects information from a sensor, but with an unknown and proprietary one-wire host-device protocol, both sides are driven by a microcontroller. I'd ...
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0answers
86 views

Scrambled Data on a RS232 port

I currently face a problem of scrambled data on one of our RS232 connections to a serial terminal and would like to request some help, if possible. Sent: Received: First of all some information ...
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4answers
201 views

Is there a data transfer limit for virtual serial ports

I want to record 5/10 seconds of audio using an electret microphone and an STM32 nucleo development board and send it to my computer in real-time to be processed. I'm a beginner so I'm sure I'm making ...
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2answers
62 views

Can I2C protocol employ differential signalling for a longer distance?

As far as I understand some serial protocols use RS485/422 differential signalling to be immune to noise for long distances. We also know that differential signalling is about voltage levels and ...

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