Download Learning BeagleBone Python Programming by Alexander Hiam PDF

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By Alexander Hiam

BeagleBone is a barebone desktop that may be configured and customised for various functions and is nearly part the cost of a regular machine. This booklet will conceal the fundamentals of the way BeagleBone Black's interface subsystems paintings, and will be managed utilizing renowned Python libraries for BeagleBone Black. you may be brought to BeagleBone Black's GPIO, PWM, ADC, UART, SPI, I2C, and eQEP subsystems. we'll then dive deep into extra advanced integrated peripherals, demonstrating alternative ways to obtain enter from a person together with buttons, potentiometers, and rotary encoders with the eQEP module. we are going to additionally find out about interfacing with exterior units; this can be verified utilizing the serial modules to interface with exterior units akin to temperature sensors and accelerometers. in the direction of the tip of the e-book, we are going to current a number of real-world difficulties and display the best way to resolve them with the abilities you've received.

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Sample text

Resistors only come in certain values, so we want to round that up to the nearest standard value of 68 Ω. Resistor values are measured in ohms, named after Georg Simon Ohm, a German physicist who discovered the relationship between voltage and current, which is the basis of what we now call Ohm's law. Ohms are notated by the capital Greek omega (Ω). 3 V GPIO pin earlier, we used a 330 Ω resistor. This is because the GPIO pins of BeagleBone's processor are only rated to source a maximum current of 4-6 mA.

3 V high level or a 0 V low level, or input mode, where it can sense whether the level on the pin is high or low. Kernel drivers The GPIO modules inside microprocessors are typically controlled by reading and writing their memory registers directly. Like many other single board Linux computers, the BeagleBone provides a kernel driver which interacts with the GPIO memory registers for you, and is controlled via a sysfs interface. [ 27 ] Digital Outputs Sysfs is a virtual file system in the Linux kernel, consisting of special virtual files that provide input to and output from kernel drivers for configuring and controlling buses and devices.

The sysfs entries for the BeagleBone Black's GPIO driver reside in /sys/class/ gpio/. Both PyBBIO and Adafruit_BBIO use these sysfs entries for GPIO access. Pin multiplexing The physical pins on the BeagleBone's microprocessor are not connected directly to the GPIO modules. Instead, they are connected to the outputs of internal multiplexers, which allow the functionality of each physical pin to be selected programmatically. This allows all of the possible I/O signals to be used, which is far more than the number of physical pins.

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