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10 Mar 2014

With the rapid development of GPS (Global Positioning System) techniques, GPS gets wider application in many fields. GPS has features such as high precision, global coverage, convenience, high quality, and low cost. Recently, the use of GPS extends speedily from military to civilian applications such as automobile navigation systems which combine the GPS system, e-map, and wireless network. GPS is getting popular, and the market for GPS techniques is extending continuously.

UARTs provide serial asynchronous receive data synchronization, parallel-to-serial and serial-to-parallel data conversion for both the transmitter and receiver sections. These functions are necessary for converting the serial data stream into parallel data that is required with digital systems. Synchronization for the serial data stream is accomplished by adding start and stop bits to the transmit data to form a data character. Data integrity is ensured by attaching a parity bit to the data character. The parity bit is checked by the receiver for any transmission bit errors.

The circuit describes how to combine GPS into a navigation system by using a Philips 2-channel UART, the SC16C2552B.  The SC16C2552B is a two channel Universal Asynchronous Receiver and Transmitter (UART) used for serial data communications. Its principal function is to convert parallel data into serial data, and vice versa. The UART can handle serial data rates up to 5 Mbit/s.

Components:

  • SC16C2552BIA44 Dual UART, 5 Mbps (max.), with 16-byte FIFOs
  • 80C51 CMOS 0 to 42 MHz Single-Chip 8 Bit Microcontroller
  • 12 MHz Oscillator Clock
  • 1.8432 MHz Oscillator Clock
  • 22pF Capacitor – 2 Units
  • 33pF Capacitor – 2 Units
  • 0.1µF Capacitor – 2 Units
  • 10 µF Capacitor – 2 Units
  • 74LV04 Hex Inverter – 2 Units

UART in GPS navigation system – [Link]

17 Feb 2014

ProMiniAutoReset

Ralph shared his auto-reset feature of his Arduino board. He writes:

Various versions of the Arduino will reset the board by toggling the serial DTR line, a feature called auto-reset. Since it relies on the DTR line, it won’t work with TTL serial adapters that don’t break out the DTR line. After writing my half-duplex serial UART, I thought of using the TTL serial break signal which holds the line at 0V for several ms. Normal serial communications would also send 0V, but at 57.6kbps, it would never last more than 160us before returning to the idle high voltage state. So what I needed was a circuit would not reset when the line is low for 160us, but would reset when the line is low for 100ms or more.

Zero-wire serial auto-reset for Arduino - [Link]

16 Feb 2014

Exar

Exar have announced the 5 mm square SP335 transceiver chip which supports RS-232, RS-485 and RS-422 serial standards. It is a single chip solution between the serial comms port and the UART or MCU allowing system designers to cater for multiple serial protocols over the same connector. The transceiver’s programmable end-of-line termination and multiple configuration modes allow all three protocols to be used interchangeably over the same cabling and connector without the need for additional switching components.

Built in protection tolerates direct shorts to DC or AC voltages as high as ±18 V and severe ESD events. The chip features a separate supply voltage for the logic interface pins, which can be as low as 1.65 V. This allows direct interface with low voltage UARTs and MCUs without the need for level shifters. It also supports data rates up to 20 Mb/s in RS-485/422 modes and 1 Mb/s in RS-232 mode and can be slew limited to 250 kb/s toggling a single control pin. With no inductors or magnetic components, the on-board charge pump generates the RS-232 bipolar voltage levels from a single supply (3.0 to 5.5 V) using just four external capacitors. [via]

Transceiver Chip Handles RS-232, RS-485 and RS-422 - [Link]

 

30 Jan 2014

Pratham PIC32 PIC32MX795F512H Breakout Board development board usb host bootloader

Pratham: Breadboardable PIC32 Breakout/Development Board With USB OTG , USB/SDCard/UART Bootloader. Gaurav Chaudhary writes:

Doing random projects with Microcontroller i always come into position when i need to have a bit more power and Peripherals then regular 8-bit micro or Arduino has to offer, but most of the powerful micro usually come in non-DIY Friendly SMD package or else they have very less pins like DIP-28.

Do what i was need is a fairly small breakout board kind of things which should be easy to handle and should contain few necessary peripherals like bunch of LED ,few switches , USB , EEPROM , VReference for ADC ,Oscillator and Voltage regulators too. and the board also need to be low cost so that i can leave in that in the application as it is. and most important things is the board should be breadboard compatible.
so here is the solution with all of the features i can think off.

Pratham: Breadboardable PIC32 Breakout/Development Board - [Link]


2 Dec 2013

PIC12FDEVBOARD3

Embedded Lab’s new development board for PIC12F series microcontrollers:

The 12F series of PIC microcontrollers are handy little 8-pin devices designed for small embedded applications that do not require too many I/O resources, and where small size is advantageous. These applications include a wide range of everyday products such as hair dryers, electric toothbrushes, rice cookers, vacuum cleaners, coffee makers, and blenders. Despite their small size, the PIC12F series microcontrollers offer many advanced features including wide operating voltage, internal programmable oscillator, 4 channels of 10-bit ADC, on-board EEPROM memory, on-chip voltage reference, multiple communication peripherals (UART, SPI, and I2C), PWM, and more. Today we are introducing a new development board (rapidPIC-08 V1.0) for easy and rapid prototyping of standalone applications using PIC12F microcontrollers.

Rapid development board for PIC12F series microcontrollers - [Link]

8 Nov 2013

obr1418_1

Keyboard, display, sensor or other device can be connected by means of Bluetooth modules even without cables.

Many times, it´s more practical to have devices interconnected wirelessly. Whether we need a simpler transfer of values from some sensor or a more complicated data communication between two devices, Bluetooth modules will manage it without a long development. Bluetooth technology with their range of 10m or up to 100m (Class 1) usually suit to many purposes where a cable connection is undesired or even impossible.

Bluetooth modules from company Rayson are based on various Bluetooth chips from a renowned company CSR, which determine main features of a given module. On stock we keep several types for example the favorite BTM-112 (Class 2) or BTM-222 (Class 1). Modules contain their own firmware, so it´s not necessary to know a functionality of given Bluetooth chips in detail, but for the most of applications it is sufficient to use configuration commands sent via UART port.

Versatility of modules is mainly in the fact, that they are able to transfer virtually any data, that´s why they can be used for controlling of peripherals, audio transmission etc. and everywhere, where there range and data transfer speed of Bluetooth protocols are sufficient.

Where a cable can’t, a Bluetooth can - [Link]

15 Oct 2012

The 12F series of PIC microcontrollers are handy little 8-pin devices designed for small embedded applications that do not require too many I/O resources, and where small size is advantageous. These applications include a wide range of everyday products such as hair dryers, electric toothbrushes, rice cookers, vacuum cleaners, coffee makers, and blenders. Despite their small size, the PIC12F series microcontrollers offer interesting features including wide operating voltage, internal programmable oscillator, 4 channels of 10-bit ADC, on-board EEPROM memory, on-chip voltage reference, multiple communication peripherals (UART, SPI, and I2C), PWM, and more. The following project board is designed for fast and easy development of standalone applications using PIC12F microcontrollers. It features an on-board regulated +5V power supply, header connectors to access I/O pins, an ICSP header for programming, a reset circuit, and a small prototyping area for placing additional components.

Mini project board for PIC12F series microcontrollers - [Link]

17 Aug 2012

Mifare and DESfire RFID modules from company Stronglink enable to use advanced RFID technologies while maintaining a very affordable price.

MIFARE ultralight, MIFARE 1k, MIFARE 4k and MIFARE DESfire are known technologies of RFID enabling to use various application, store various data and other functions. From this reason, they´re largely used in admission systems, loyalty programs, goods tracking and many other segments. From the security point of view, mainly the DESfire system with the DES/AES encryption excels. New 13,56 MHz Stronglink modules in our portfolio – SL025M, SL030, SL031, SL032, SL040 and SL040A enable to use these technologies and they are relatively easily applicable because of more reasons. Firstly, they are available in more versions with UART, I2C, RS232 as well as USB interface, they are certified (CE and RoHS) and the producer provides an above-standard development support.

Usage of modules is also simplified by their low power consumption and a relatively very low-profile construction with the height of only few mm. An important factor – the price, also says in favor of Stronglink modules, because they´re available for relatively very competitive prices. For the development support, there are also available source code examples for various microcontroller families. Further information will provide you the SL025M, SL030, SL031, SL032, SL040 and SL040A user manuals and AN100721, AN101203 and AN110221 application notes.

Stronglink modules will provide you a highly secure RFID - [Link]

9 Aug 2012

FTDI released the FT311D USB host IC for easy communication with Android devices. It features 7 GPIOs, one I2C peripheral, one UART, one SPI, and 4 PWM peripherals.

The device acts as a USB host to an Android device, while the Android’s app directly controls the peripherals on the IC. The device is configurable trough 3 CFG pins. [via]

FT311D USB host IC provides easy communication with Android devices - [Link]

23 Jul 2012

Scanalogic-2 PRO is a 4 channel Logic Analyzer and Digital Signal Generator priced at 59€. At this cost it’s easy for a hobbyist to get one and make digital circuits debugging a breeze. It’s designed to capture, decode and analyze serial protocols like SPI, I2C, UART, 1-WIRE and CAN in a few clicks. Data is captured on PC using the free and efficient ScanaStudio software.

Features:

  • 20 Million Samples Per Second
  • 4 Input/Output channels
  • 256K Sample per channel
  • 2V, 2.8V, 3.3V, 3.6V and 5V logic levels support
  • Serial protocols decoders (SPI, I2C, 1-WIRE, UART, CAN, LIN,Manchester)
  • Various trigger options

> Download features PDF

What you can do with  Scanalogic 2

  • Capture and Analyze signals – Serial protocols sampling, decoding, debugging (UART, I2C, SPI, CAN, 1-WIRE, LIN, Manchester,…)
  • Save captured data and playback them later or on the other side of world!
  • Generate PWM, FM or UART signals
  • Capture images of your signals for demostration.
  • Digital PWM and FM signals analysis (FFT)
  • Compare captured signals.
  • Use “mixed”  mode to play a signal and record response on another channel (at the same time!)
  • Generate your own data (PWM, FM, Serial Data)
  • ScanaStudio PC software offers smooth scrolling and navigation options.

Read the rest of this entry »



 
 
 

 

 

 

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