By Warren Gay

Design and construct customized interfaces for the Raspberry Pi and realize in your price range show and sensor concepts for embedded method tasks.

With this ebook you will grasp 12C communications utilizing Raspbian Linux in C++ and practice ADC and DAC experiments. you will test with debounce buttons and switches utilizing and software program recommendations. boost flywheel rotary encoder results for ease of tuning and build a interface to the tune enjoying Daemon (MPD) with built software program. become aware of how one can upload your personal keypad for distant blend lock purposes.

Custom Raspberry Pi Interfaces deals an intensive bankruptcy on interfacing 5-volt platforms to 3.3-volt Raspberry Pis designed to extend your number of peripheral thoughts. able to pass C++ courses concerning GPIO and I2C peripherals are supplied. This e-book additionally explores ADC, DAC, rotary encoders, CMOS shift registers. I2C I/O extenders.

What you will learn:

  • Build easy, reasonably-priced input/output interfaces together with rotary encoders
  • Interface with 5-volt units from a 3-volt Raspberry Pi process
  • Apply analog to electronic and electronic to analog conversions at the Pi
  • Read potentiometers (volume regulate) from the Pi
  • Determine step, instructions, and speed of a rotary encoder
  • Perform distant interfacing utilizing the I2 PCF8574 chip
  • Work with exterior CMOS units just like the 74HC595 (in C++)

Who this booklet is for:

    Students and hobbyists drawn to development customized interfaces for his or her Raspberry Pis.

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    Extra resources for Custom Raspberry Pi Interfaces: Design and build hardware interfaces for the Raspberry Pi

    Example text

    HDMI to VGA adapter I already owned several VGA monitors, but I wondered about general VGA monitor availability. They are bound to be more plentiful presently given that everyone is switching to HDMI monitors. A search on Kijiji quickly confirmed that they can be had for as little as $20 (and probably less by the time you read this). For example, one $20 monitor I found being sold was a Samsung SyncMaster 193V 19-inch LCD monitor. The native resolution was 1280×1024. Such a deal! With a VGA converter and a cheap VGA monitor, you can strap the Pi on the back of the monitor and have a cheap self-contained display terminal.

    Using a DMM, I was able to confirm that V0, which is pin 3, is actually the third pin from the top right of Figure 4-3. I seem to have a clone of the original design where they botched the silk screening. The PCB square should have been at the top right instead. I mention this to save you a lot of agony. Once the PCB is soldered to the LCD module, it is difficult to separate them. Take your time getting the orientation correct before you plug in that soldering iron. Figure 4-8 shows the I2C module installed on the LCD module.

    But it is best to consult the BF status flag because if the LCD controller should miss a command or data byte, you would have no knowledge of it in your program. The display would continue in a messedup state until it was reset by your code. Class LCD1602 I2C programming is covered in Chapter 11, so I won’t repeat that here. hpp" Then you can make use of the LCD1602 class to interact with your display.

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