Instructions

ManualsBrandsMAKERFACTORY ManualsLeisure & HomeCourse material MAKERFACTORY Raspberry Pi Ei 15043 14 years and over

CONRAD MAKER FACTORY EGG FOR

RASPBERRY PI

Controlling simple electronics using a normal PC or even a notebook

– even if only for a few LEDs – can be quite a challenge for any hobby

programmer. A PC simply lacks the necessary interfaces for this. In

addition, the Windows operating system is unthinkably unsuitable for

communicating with electronics.

The Raspberry Pi is – although it doesn't look like it at first – is a full-

fledged computer. Many things work a little slower than you are used

to from modern PCs, but the Raspberry Pi is also much smaller and

cheaper than a PC.

The experiments in this Tech-Egg are programmed using Scratch.

This programming language is pre-installed on the Raspberry Pi and

impresses with its low training. You can immediately start programming

without any previous knowledge. All experiments work with Raspberry Pi

3 and Raspberry Pi 3 B+.

PREPARING RASPBERRY PI

To put the Raspberry Pi into operation you need:

USB keyboard and mouse

HDMI cable and monitor

Network cable or WLAN

MicroSD card with operating system

Raspbian (from version 2.8.2)

Micro-USB mobile phone charger as

power supply unit (at least 2,000 mA)

The power supply must be connected last, so that the Raspberry Pi

switches on automatically. There is no separate on/off switch.

OPERATING SYSTEM INSTALLATION IN A NUT-

SHELL

For all those who do not yet have their Raspberry Pi ready for opera-

tion with the current Raspbian version, here is the system installation

in ten steps:

1. Download NOOBS at least version 2.8.2 of www.raspberrypi.org/

downloads to your PC and unzip the zip archive to your hard disk.

2. If the SD card has already been used, reformat with the SD format-

ter in the PC: www.sdcard.org/downloads/formatter_4. Switch on

Format Size Adjustment (the SD card must be at least 4 GB in size).

3. Copy all files and subdirectories from NOOBS to the SD card.

4. Remove the SD card from the PC, insert it into Raspberry Pi and

boot. Select English as the installation language at the bottom. This

automatically selects the English keyboard as well.

5. Check the preselected Raspbian operating system and click Install

at the top left. After confirming a security prompt that the memory

card is being overwritten, the installation starts, which takes a few

minutes. Once the installation is complete, the Raspberry Pi reboots.

6. Since version NOOBS 2.8.2 an automatic configuration wizard starts.

In the first dialog box, click Next and select Language and Time Zone

if they are not automatically set to English.

7. In the next step it is recommended to change the default password,

which is not absolutely necessary for the experiments in this Tech-

Egg.

Summary of content (10 pages)

PAGE 1
PREPARING RASPBERRY PI To put the Raspberry Pi into operation you need: USB keyboard and mouse HDMI cable and monitor Network cable or WLAN MicroSD card with operating system Raspbian (from version 2.8.2) Micro-USB mobile phone charger as power supply unit (at least 2,000 mA) The power supply must be connected last, so that the Raspberry Pi switches on automatically. There is no separate on/off switch.
PAGE 2
8. For WLAN connection, select network and enter password, for Ethernet connection simply click on Skip. 9. The next step is to ask if you want to download updates. Depending on the number and size of updates available since the operating system image, this installation can take up to an hour, but can also be skipped with Skip. LEDS LEDs light up when current flows through them in the direction of flow.
PAGE 3
GPIO CONNECTION CABLE The coloured connection cables all have a plug on one side and a socket on the other side, which fits on a GPIO pin of the Raspberry Pi. The plugs are plugged into the plug-in board. The programmable GPIO pins on the Raspberry Pi have numbers, the ground pins are marked by GND in the figure. be activated once for each program via the menu item Edit/Start GPIO server. You can see that GPIO support is active by the fact that this menu item changes to Stop GPIO server .
PAGE 4
THE PROGRAM In Scratch you don't have to type any program code when programming. The blocks are simply attached to each other by dragging and dropping. The Block Palette in the left part of the scratch window contains the available blocks sorted by type. After the red LED on pin 8 is switched on and the green LED on pin 12 is switched off, the program waits half a second. For this, Scratch offers its own block wait...secs.
PAGE 5
THE PROGRAM TOUCH SENSOR FROM PLASTICINE The program 02ampel01 does not really contain anything new compared to the previous program. The GPIO pin switched as input is connected to +3.3 V via an extremely high-impedance resistor (20 MOhm), so that there is a weak but clearly defined high signal present. A person who is not floating freely in the air is always earthed and delivers a low level current through his electrically conductive skin.
PAGE 6
Drag this block to the placeholder field on the left of the green EQUALTO operator. Select the sensor gpio21 in the list field of the blue block. In addition to some predefined sensors, all GPIO pins defined as inputs are available for selection. Now click once on the green flag in the upper right corner to start the unfinished program. This defines the GPIO pins and gpio21 appears in the selection list. Stop the program again using the red stop sign.
PAGE 7
THE PROGRAM The program 04leds contains some new elements compared to the previous programs. Thereafter, a forever will start running on a randomly selected LED and turning off a randomly selected LED after 0.1 seconds. Here too, the texts in the broadcast... blocks are rebuilt every time. A block pick random... to... from the green block palette Operators selects a random LED. The random number must be between 1 and the length of the list LEDs, in our case 7.
PAGE 8
LIGHT CONTROL PANEL IN SCRATCH A simple light control panel switches the LEDs in Scratch by clicking. The Scratch control panel also displays the status of the LEDs. COMPONENTS (THE CONSTRUCTION CORRESPONDS TO THE PREVIOUS EXPERIMENT) 1 Plug-in board 2 LEDs red with series resistor 2 LEDs yellow with series resistor 2 LEDs green with series resistor 1 LED blue with series resistor 8 GPIO connection cables The Scratch program 05lauflicht lets LEDs light up as running lights.
PAGE 9
Edit the costume 2 in the paint program. Fill the circle with the colour yellow. Then change the used GPIO pin in the script block to 7. Duplicate more blocks, then change the colours of the costume2 to the colours of the corresponding LEDs and pin numbers accordingly. Start the program by clicking on the green flag. All LEDs are off; the objects appear in grey. If you click on one of the objects, it appears in colour and the corresponding LED shines until the next click.
PAGE 10
Die with 7 LEDs controlled via a sensor contact. Then a random number between 1 and 6 is generated and stored in the variable w . If you turn the switch to the left of the variable w on the block palette Variables, this variable is automatically displayed in a small orange field on the stage with the cat. This way you can always see the diced number and easily check if the LEDs are working. This number field is very small. Right-click and select Large Readout from the menu.