Technical/Engineering
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Bus Pullups and Drive Using a constant current pullup will dramatically improve bus reliability. The I2C Bus normally uses a resistive pullup. The exponential RC pullup characteristic is not ideal. It slows the bus down and reduces the noise margin.
Constant Current Pullup
I2C (Inter-Integrated Circuit) is a short distance serial interface that requires only 2 bus lines for data transfer. It was invented by Philips in 1980′s, originally to provide easy on-board communications between a CPU and various peripheral chips in a TV set. Today, it is widely used in varieties of embedded systems to connect low speed peripherals (external EEPROMs, digital sensors, LCD drivers, etc) to the main controller. In this experiment, we will cover an overview of I2C protocol, its implementation in PIC microcontrollers, and the method of connecting single and multiple devices on a common I2C bus.
Lab 14: Inter-Integrated Circuit (I2C) communication
Why pay for Serial LCDs when you can make your own?
HD44780 based LCD displays are very popular for embedded projects because they are cheap, easy to interface, can display characters, consume power lot less than seven-segment displays, and most of the present day compilers have in-built library routines for them. However, the only disadvantage is that they require at least 6 I/O pins of microcontroller. Well, you may ask, isn’t that less than what seven-segment displays require?
Power Engineering
Siemens SIMATIC Step 7 Programmer's Handbook
“Great taste. Less filling.†When one hears the words “Lite†and software you tend to think of software that’s not really usable. Depending on your needs this may not be the case with the Siemens STEP 7 Lite package. The four major limitations in STEP 7 Lite verses the more advanced STEP 7 package are: If you’re interested in more details then refer to our chart of differences between the Step 7 program packages .
A free series of textbooks on the subjects of electricity and electronics Copyright (C) 2000-2013, Tony R. Kuphaldt These books and all related files are published under the terms and conditions of the Design Science License. These terms and conditions allow for free copying, distribution, and/or modification of this document by the general public. A copy of the Design Science License is included at the end of each book volume.
Lessons In Electric Circuits
Serial Communication Protocols: CAN vs. SPI | Netrino
by Niall Murphy Distributed systems require protocols for communication between microcontrollers. Controller Area Networks (CAN) and Serial Peripheral Interfaces (SPI) are two of the most common such protocols. The beauty of using multiple processors in a single system is that the timing requirements of one processor can be divorced from the timing requirements of the other.
Programming
Programming Tutorials: C++ Made Easy and C Made Easy
Welcome! If you're new to C++, I recommend you purchase my ebook, Jumping into C++ , a complete step-by-step guide for beginners. If you're looking for free tutorials, learn C++ with our C++ tutorial, starting at C++ Made Easy, Lesson 1 ( all lessons ) If you want to learn C instead, check out our C tutorial C Made Easy, Lesson 1 ( all lessons ) Want more advanced material on C, C++ graphics, game programming or algorithms?Wireless
10 Hz - FMP04-TLP GPS module 26x26mm (smart antenna type) MediaTek chipset In efforts to revamp our SD GPS Datalogger we have found these 10 Hz GPS Modules. These really are the holy grail in terms of price, sensitivity, update rate, power consumption and external antenna options.
LLC
Market
PLC
History of the Modbus protocol Some communication standards just emerge. Not because they are pushed by a large group of vendors or a special standards organisation. These standards—like the Modbus interface—emerge because they are good, simple to implement and are therefore adapted by many manufacturers. Because of this, Modbus became the first widely accepted fieldbus standard.
