By Warren Gay
Design and construct customized interfaces for the Raspberry Pi and observe low-priced show and sensor innovations 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 scan with debounce buttons and switches utilizing and software program recommendations. advance flywheel rotary encoder results for ease of tuning and build a interface to the song enjoying Daemon (MPD) with constructed software program. observe find out how to upload your individual keypad for distant mix lock purposes.
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 recommendations. able to cross C++ courses related to 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, low in cost 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 an eye on) 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 ebook is for:
Students and hobbyists attracted to construction 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
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. The power and the two I2C connectors should be located at the upper right. I put a piece of electrical tape underneath the I2C module before soldering it in place. This will keep bare connections from bumping into connections on the LCD module. 44 Chapter 4 ■ I2C LCD Displays Figure 4-8. I2C module attached to LCD module I like to test things as I go since this saves a lot of troubleshooting effort when things go wrong and provides a confidence boost when things are going right.
But if the electric charge is high enough, the metal oxide can be punctured and shorted out. This damage is permanent and destroys Field Effect Transistor (FET) operation. To protect the gate from static electricity, protective diodes are built into the device. There are different ways this is accomplished, but it is frequently done as shown in Figure 2-8. Diodes D1 and D2 are reversed biased in a way that causes them not to interfere with normal input signals. 16 Chapter 2 ■ 3V/5V Signal Interfacing D2 VDD Q2 R1 Output D1 Input Q1 GND Figure 2-8.
10. Figure 4-3 illustrates the module that I purchased. 36 Chapter 4 ■ I2C LCD Displays Figure 4-3. The I2C Serial Interface module with the PCF8574 chip at the center. Pin 1 is at the right side, despite the silk screen. 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.
Custom Raspberry Pi Interfaces: Design and build hardware interfaces for the Raspberry Pi by Warren Gay