Download e-book for iPad: Custom Raspberry Pi Interfaces: Design and build hardware by Warren Gay

By Warren Gay

ISBN-10: 1484224051

ISBN-13: 9781484224052

ISBN-10: 148422406X

ISBN-13: 9781484224069

Design and construct customized interfaces for the Raspberry Pi and observe cost-efficient exhibit and sensor strategies for embedded approach tasks.

With this booklet you will grasp 12C communications utilizing Raspbian Linux in C++ and practice ADC and DAC experiments. you will scan with debounce buttons and switches utilizing and software program recommendations. increase flywheel rotary encoder results for ease of tuning and build a interface to the track taking part in Daemon (MPD) with built software program. become aware of the way to upload your individual keypad for distant blend lock functions.

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

What you will learn:

  • Build basic, economical input/output interfaces together with rotary encoders
  • Interface with 5-volt units from a 3-volt Raspberry Pi procedure
  • Apply analog to electronic and electronic to analog conversions at the Pi
  • Read potentiometers (volume keep watch over) from the Pi
  • Determine step, instructions, and pace 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 e-book is for:

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

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

    Sample text

    So, the absolute maximum speed these devices can signal from low to high and low again can be calculated as follows: F= 22 1 1 = = 2 MHz t PHL + t PLH 250 ns + 250 ns Chapter 2 ■ 3V/5V Signal Interfacing But this is not all there is to it because the signal must usually hold for a time in one state or the other. The actual rate could easily be half or less. 3 volts. So, what is the absolute maximum frequency for this device? 5ns Notice the difference in signal rate. Again, this does not take hold times into account, but knowing the absolute limit is helpful in planning.

    The module has three solderable jumpers marked A0, A1, and A2 (on the bottom right of Figure 4-3). Since CMOS inputs must not be left floating, there are pull-up resistors on the board. Based upon resistance readings taken, it appears that the three surface mount resistors marked “103” are the 10kΩ pull-up resistors to each of the address inputs. Soldering in a shorting jumper will change the address input to a logic 0. Without any jumpers installed, this I2C PCB will respond to I2C address 27 hexadecimal (hex).

    To be able to read an input, there is a cheat step required: the port must first be written with a 1 bit so that its weak pull-up current source can allow the port to rise high. Then the component driving the input can pull the voltage down to ground level when transmitting a 0 bit to the input. When a 1 bit is transmitted to the port, the signal is simply brought high again with some assistance from the weak pull-up current source. If the input port was left in the output 0 bit state, the port’s output driver transistor would keep that port grounded.

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    Custom Raspberry Pi Interfaces: Design and build hardware interfaces for the Raspberry Pi by Warren Gay

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