Joy-it EXPLORER 700 Bedienungsanleitung

www.joy-it.net

Pascalstr. 8 47506 Neukirchen-Vluyn

EXPLORER 700

Expansion board

1. GENERAL INFORMATION

Dear customer,

Thank you for purchasing our product. In the following, we will show you

which things should be noted during the use.

Should you encounter any unexpected problems, do not hesitate to

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Pascalstr. 8 47506 Neukirchen-Vluyn

2. CONNECTIONS

0,9" OLED:

SSD1306 driver,

resolution 128 x 64 Buzzer

CP2102 :

USB to UART converter

USB to UART: controlling the Pi

via serial interface

AD / DA IO-interface:

screw terminal

sensor interface:

connecting various sensors

Raspberry Pi GPIO interface:

to connect something with Raspberry Pi

PCF8591: 8bit AD/DA

converter, I2C interface

BMP280: pressure

sensor, I2C interface

PCF8574: I/O expension chip,

I2C interface

DS3231: real time clock chip,

I2C interface

Power indicator

user LED

joystick

LFN0038K IR

receiver

1-WIRE

interface: to

connect

1-WIRE

devices like

DS18B20

Schematic overview

All pins listed here refer to the GPIO/BCM pins of the Raspberry Pi.

Pin 8

Pin 19 Pin 16

Pin 20

Pin 18

Pin 26

Pin 5

Pin 6

Pin 13

Pin 12

Pin 21

Pin 4

SCL

SDA

SCK

MOSI

3V3

GND

3V3

Ports

Modules

ICs

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RES

DNC

SCK

MOSI

OLED

Pin 8

Pin 19

Pin 16

SCK

MOSI

Joysck

DOWN

LEFT

Right

Push

Pin 20

3V3

GND

OUT

IR-Receiver

3V3

GND

Pin 18

LED1

LED2

PWR

LEDs

Pin 26

LED2

3V3

GND

Buzzer

Buzz

GND

AIN0 AIN3

AIN1 DOUT

AIN2 GND

Screw terminal

AIN0

AIN1

AIN2

AIN3

AOUT

GND

Sensor interface

Analog Pins

AIN0

AIN1

AIN2

AIN3

Sensor interface

Digital Pins

Pin 5

Pin 6

Pin 13

Pin 12

SCL

SDA

DS3231 RTC

0x68

SCL

SDA

SCL

SDA

BMP 180

0x76

SCL

SDA

SCL P3

SDA P4

INT P5

P0 P6

P1 P7

PCF 8574

IO-Expander

0x20

LED 2

Buzz

SCL

SDA

Pin 21

AIN0

SCL AIN1

SDA AIN2

AIN3

AOUT

PCF 8591

ADC

0x48

AIN0

AIN1

AIN2

AIN3

AOUT

SCL

SDA

3V3

DATA

GND

OneWire

(DS18B20)

3V3

Pin 4

GND

Backside of Explorer 700

L4 L3

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3. CONNECTING THE EXPANSIONBOARD

The Explorer 700 expansion board supports the Raspberry Pi A+, B+, 2, 3

Model B and 4. Before you can perform the code examples, you should

ensure that the Explorer 700 is connected to your Raspberry Pi and it is

provided with power.

4. AVAILABLE DOWNLOAD

We provide you with a pre installed image, which saves you the trouble of

installing and setting up libraries. You can download the image here.

To install the image on your microSD card, you can use Win32DiskIma-

ger. Here you select the microSD card to write to and the downloaded

image. Now click on

Write

to write on this SD card.

If you are not using our image, you can download our sample codes here,

which will help you to access these samples. But then please note the

following two chapters.

These chapters can be skipped when using our image.

5. INSTALLATION OF THE LIBRARIES

To use API examples which we oer, certain libraries are required which

should be installed manually, if you are not using our image. Python

libraries for Raspbian (includes Raspberry Pi, GPIO and spidev installation

packages. See: https://pypi.python.org/pypi/RPi.GPIO

https://pypi.python.org/pypi/spidev ) You get them with the command

wget

Please note that the Raspberry Pi must be connected with the internet if

you want to us this command to install the library. Beforehand, you can

use the following command to update your soware to the latest.

sudo apt-get update

sudo apt-get upgrade

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Enter now the following command to install the Python-dev package.

sudo apt-get install python3-dev

Enter the following commands to install the smbus and smbus2 library

(I2C interfaces functions):

sudo apt-get install python3-smbus

sudo pip3 install smbus2

Enter the following command to install the serial library which includes

the UART interface functions.

sudo apt-get install python3-serial

To use the OLED, you must install this library :

sudo apt-get install python3-pil

For our code examples, the libraries RPi.GPIO and spidev are mandato-

ry.

You can install the RPi.GPIO library with the following command:

sudo apt-get install python3-rpi.gpio

The spidev library with this command:

sudo pip3 install spidev

Furthermore, for the BMP2802 you need libraries from Adafruit

CircuitPython_BMP280 and CircuitPython_Bundle, which are both

published under the MIT license (BMP280 and Bundle) . You install them

as follows:

sudo apt-get install git

git clone https://github.com/adafruit/Adafruit_CircuitPython_BMP280.git

sudo pip3 install adafruit-circuitpython-bmp280

git clone https://github.com/adafruit/Adafruit_CircuitPython_Bundle.git

sudo pip3 install adafruit-circuitpython-lis3dh

To install the ADC library, enter the following commands:

git clone https://github.com/joy-it/PCF8591-python3-lib.git

cd ~/PCF8591-python3-lib/

sudo python3 setup.py install

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6. CONFIGURATION OF THE INTERFACES

Before running the API codes we provide, you should activate the ap-

propriate drivers for the interfaces.

Activation of the I2C-function

Enter the following command to configure your Raspberry Pi board.

sudo raspi-config

Choose in

Interfacing Options

→

I2C

→

Yes

to start the core driver of I2C.

Aerwards, you should adjust the configuration file. To open the

configuration file, enter the following:

sudo nano /etc/modules

Add the following two lines at the end of the configuration file:

i2c-bcm2708

i2c-dev

Press the key combination

CTRL + X

to leave the settings and press

save them.

Activation of the serial functions

The serial port of the Raspberry Pi is set on the debugging via console

mode by default. If you want to use the serial port as a normal IO, you ha-

ve to adjust the configuration of the Raspberry Pi. If the debugging via

console function is deactivated, you can not access the Raspberry Pi

board via the serial port. If you want to control the Raspberry, you must

activate the debugging of the serial port via the console function again.

sudo raspi-config

Choose in

Interfacing Options

→

Serial

. Through selecting the option

the debugging via the console function will be deactivated. Aer-

wards, the serial port can be used for the serial communication. With sel-

ecting the option

Yes

the debugging via console function can be acti-

vated again.

You also need to activate the 1-Wire interface. To do this, select

Interfa-

cing Options → 1-Wire

and activate the function with

Yes

You should now restart the Raspberry Pi.

Note: The serial port of the Raspberry Pi 3B is not available

because pin14 and 15 are connected with its own Blue-

tooth.

sudo raspi-config

To still use the serial functions, you have to enable the SPI-function. For

that, you open the terminal and enter the following command:

Now you only have to choose in

Interfacing Options

→

SPI

→

Yes

enable the SPI functions.

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8. CHANGING THE LED STATUS

The explorer board has LEDs which can be controlled by our code

examples. LED1 can be used directly.

To use this LED open the terminal and enter the following commands:

cd ~/Desktop/Explorer-700/LED1/

sudo python3 led.py

LED1 should now start blinking.

Press the keys CTRL + C to exit this program.

There is another code for LED1 which lets it pulsate.

sudo python3 pwm.py

Press the keys CTRL + C to exit happens.

7. ANALOG DIGITAL CONVERTER EXAMPLES

The Explorerboard has 4 analog inputs which can be converted to digital

signals by the ADC PCF8591.

To start the example program, enter the following commands:

cd ~/PCF8591-python3-lib/examples/

sudo python3 read.py

The board also has an analog output, which can be used to output an

analog signal.

To start the example program, enter the following commands:

cd ~/PCF8591-python3-lib/examples/

sudo python3 write.py

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10. I/O-EXPANDER - PCF8574

The I/O Expander PCF8574 also controls the LED2, the buzzer and the

joystick.

Open the console and enter the following commands:

cd ~/Desktop/Explorer-700/

sudo python3 led2.py

With this program, LED2 is blinking.

Press the keys CTRL + C to exit the program.

sudo python3 joystick.py

This program combines the functions of the Explorerboard, which are

controlled by the PCF8574. When the joystick is pressed in one direction,

the buzzer sounds, LED2 lights up and the console outputs the direction

in which the joystick is pressed.

left

down

right

Press the keys CTRL + C to exit this program.

11. BAROMETER - BMP280

This sample code is based on two Adafruit libraries (chapter 5). This

sensor can measure temperature and air pressure and can therefore also

calculate the altitude.

Note that the temperature can be influenced by the heat of the Rasp-

berry Pi.

In order to calculate a correct altitude, change the sea air pressure to

the air pressure at the current location in the sample code.

cd ~/Desktop/Explorer-700/BMP280/

sudo python3 bmp280.py

9. PRESS FUNCTION OF THE JOYSTICK

The joystick has next to the press function the common directions of

movement. Our code example shows when the press function is used.

Open the Linux console and enter the following commands:

cd ~/Desktop/Explorer-700/

sudo python3 press-joystick.py

By pressing the Joystick, the console will show the following:

JOYSTICK PRESSED

Press the keys CTRL + C to exit this program.

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12. REAL - TIME CLOCK - DS3231

You can terminate the connection to the RTC with the following

command :

sudo i2cdetect -y 1

Now you should see an address with which you can control the RTC. With

us it is 0x68. If this address is dierent, you must change it in the code

example.

You can embed this RTC into your system as a real-time clock or use it

only in a code. Please note that a real-time clock is only fully functional if

a battery is installed in the corresponding battery holder.

Embedding in the system

First, you edit the

modules

file. You do this with the following command:

sudo nano /etc/modules

Add this line to the end of the file:

rtc-ds3231

You can save the file with CTRL + O and exit the editor with CTRL + X.

Now you have to edit the

config.txt

. Open it with the following command:

sudo nano /boot/config.txt

There you add this line to the end of the file:

dt-overlay=i2c-rtc,ds3231

You can save the file again with CTRL + O and exit the editor with CTRL +

X. Now, you have to install the driver of the RTC. The driver of DS1307

(another RTC) is also used by DS3231.

sudo modprobe rtc-ds1307

sudo nano /etc/rc.local

Above the command

exit 0

add the following three lines:

Now edit the following file to set the system time aer a start to the time

of the RTC:

Close the file again with CTRL + O and CTRL + X and restart the Raspberry

Pi. Now the time of the system aer each restart is set by the RTC.

Note that a CR1220 battery must be inserted in the battery holder so

that the real-time clock can maintain the correct time.

echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device

hwclock --hctosys

date

exit 0

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sudo rmmod rtc-ds1307

You only need to execute this command if you have embedded the RTC in

the system. You should then also remove the added lines in

rc.local

avoid incorrect changes in the system.

In our code example we use the library RTC_SDL_DS3231 published by

SwitchDoc Labs .

To execute the code, you must go first into subfolder . You do this with

the following command:

cd ~/Desktop/Explorer-700/RTC_SDL_DS3231

There you can execute our code, which maps the RTC to system time and

sets the time and date every second. You can execute this code with the

following command:

sudo python3 ds3231.py

sudo hwclock -r

With this command the time of the RTC can be output.

sudo hwclock -w

Aerwards, you can control the RTC as one of the system.

Therefore, you can now use the following commands:

Use in code

If you want to use your RTC in the code, you must uninstall the drivers of

the RTC or do not embed the RTC in the system, because the driver of the

RTC blocks it for further processes. You can uninstall the driver with:

This command adjusts the RTC to the time of the system.

Press the keys CTRL + C to exit this program.

13. TEMPERATURE SENSOR - DS18B20

The temperature sensor which is included in the scope of delievery, must

be connected seperately and is not on the board. Thereby, you should

note that the straight side of the sensor is showing to the display and the

rounded side is pointing torwards the Raspberry Pis USB and ethernet

ports.

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