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docs: GPIO proofreading

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sfalexrog
2019-08-01 15:11:09 +03:00
committed by Oleg Kalachev
parent f05e0cc33e
commit 45f637e9a8
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docs/en/gpio.md
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@@ -1,16 +1,16 @@
# Working with GPIO
GPIO (General-Purpose Input/Output) – is a type of Raspberry Pi's pins, with programmatically adjustable and measurable voltage. On some of the pins there also is hardware implemented <abbr title="Pulse-width modulation">PWM</abbr>.
A GPIO (General-Purpose Input/Output) pin is a programmable digital signal pin on a circuit board or a microcontroller that may act as an input or an output. Raspberry Pi has a set of easily accessible GPIO pins, some of which have hardware <abbr title="Pulse-width modulation">PWM</abbr>.
> **Info** Use the [pinout](https://pinout.xyz) for figuring out, which Raspberry Pi's pins support GPIO and PWM.
[The RPi image](microsd_images.md) includes [`pigpio`](http://abyz.me.uk/rpi/pigpio/) library for work with GPIO. To interact with this library, run the appropriate daemon:
The [`pigpio`](http://abyz.me.uk/rpi/pigpio) library for interfacing with the GPIO pins is already preinstalled on [the RPi image](microsd_images.md). To interact with this library, run the appropriate daemon:
```bash
sudo systemctl start pigpiod.service
```
For enabling automatic launch of the daemon, use command:
To enable automatic launch of the daemon, run:
```bash
sudo systemctl enable pigpiod.service
@@ -25,15 +25,15 @@ import pigpio
# initializing connection to pigpiod
pi = pigpio.pi()
# setting pin 11 mode for output
# set pin 11 mode for output
pi.set_mode(11, pigpio.OUTPUT)
# enabling signal of pin 11
# set signal of pin 11 to high
pi.write(11, 1)
time.sleep(2)
# disabling signal on pin 11
# set signal on pin 11 to low
pi.write(11, 0)
# ...
@@ -45,13 +45,13 @@ pi.set_mode(12, pigpio.INPUT)
level = pi.read(12)
```
For finding out pins' numbers, use the [Raspberry Pi pinout](https://pinout.xyz).
To find out the pins' numbers, consult the [Raspberry Pi pinout](https://pinout.xyz).
## Connecting servos
Most of servos are controlled with PWM signal. Extreme positions of servos are reached with signal widths approximately equal to 1000 and 2000 µs. Values for a specific servo can be determined experimentally.
Servo motors are typically controlled with PWM signal. Extreme positions of servos are reached with signal widths approximately equal to 1000 and 2000 µs. Values for a specific servo can be determined experimentally.
Connect the signal wire of the servo to one of GPIO-pins of the Raspberry. For controlling a servo, connected to the pin 13, use a code like this:
Connect the signal wire of the servo to one of GPIO-pins of the Raspberry. To control a servo connected to the pin 13 use a code like this:
```python
import time
@@ -59,23 +59,23 @@ import pigpio
pi = pigpio.pi()
# setting mode of pin 13 to output
# set mode of pin 13 to output
pi.set_mode(13, pigpio.OUTPUT)
# setting pin 13 to output PWM signal 1000 us
# set pin 13 to output PWM signal 1000 us
pi.set_servo_pulsewidth(13, 1000)
time.sleep(2)
# setting pin 13 to output PWM signal 2000 us
# set pin 13 to output PWM signal 2000 us
pi.set_servo_pulsewidth(13, 2000)
```
## Connecting electromagnet
## Connecting an electromagnet
![GPIO Mosfet Magnet Connection](../assets/gpio_mosfet_magnet.png)
For connecting an electromagnet, use a field-effect transistor (MOSFET). Connect the MOSFET to one of GPIO-pins of the Raspberry Pi. For controlling the magnet, connected to the pin 15, use a code like this:
To connect an electromagnet use a field-effect transistor (MOSFET). Connect the MOSFET to one of GPIO-pins of the Raspberry Pi. To control the magnet connected to the pin 15 use a code like this:
```python
import time
@@ -83,14 +83,14 @@ import pigpio
pi = pigpio.pi()
# setting mode of pin 15 for output
# set mode of pin 15 for output
pi.set_mode(15, pigpio.OUTPUT)
# enabling the magnet
# enable the magnet
pi.write(15, 1)
time.sleep(2)
# disabling the magnet
# disable the magnet
pi.write(15, 0)
```