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Raspberry Pi educational boards

A project log for Electronics Workshops Resources

Project where I put logs and other useful informations from past workshops

Yann Guidon / YGDES 02/21/2017 at 05:582 Comments

During the training at IESA Multimedia, student projects need boards to learn how to control inputs and outputs.

I designed 5 boards:

Rainbow board

Just a fancy board with 9 LEDs of different colors

Used with #micro HTTP server in C by #hammer's smashing game - Rasberry Pi

ROUGE : GPIO4
ORANGE : GPIO5
VERT_JAUNE : GPIO6
VERT : GPIO7
VERT OCEAN : GPIO8
BLEU : GPIO9
UV : GPIO10
BLANC : GPIO11
ROSE : GPIO12



Car board

For simulations of a car's remote control

Throttle (HP) : GPIO18 (can use PWM)

Right : GPIO5
Left : GPIO6
Backwards : GPIO7
Forward : GPIO8

Some bash code implements the roundabout pattern:

while  true
do

sleep 0.5
./GPIO_on.sh 6
./GPIO_off.sh 7

sleep 0.5
./GPIO_on.sh 8
./GPIO_off.sh 6

sleep 0.5
./GPIO_on.sh 5
./GPIO_off.sh 8

sleep 0.5
./GPIO_on.sh 7
./GPIO_off.sh 5

done

The throttle output is actually connected to a dirty amplifier that drives a miniature 4 Ohms loudspeaker. No crazy magic here but I used a crude discrete CMOS amplifier (BS170 and BS250, as used in other projects) with an input resistor to reduce the bandwidth. A LC network (with L having significan R) keeps the current draw low depending on the binary signal's frequency.

Some dirty code makes it vibrate:

while  true
do
./GPIO_on.sh 18
./GPIO_off.sh 18
done
(the GPIO scripts are provided by #C GPIO library for Raspberry Pi )


LED board

Just a few miscelaneous LED (a red block, a green block, a RGB LED (inverted polarity !) and a 7-segments (and dot) module.

RED : GPIO14
GREEN : GPIO15

RGB_R : GPIO19 (inverted!)
RGB_G : GPIO20 (inverted!)
RGB_B : GPIO21 (inverted!)

7SEG_A : GPIO4
7SEG_B : GPIO5
7SEG_C : GPIO6
7SEG_D : GPIO7
7SEG_E : GPIO8
7SEG_F : GPIO9 (assignation: to be determined)
7SEG_G : GPIO10
7SEG_H : GPIO11

PIR board

8 inputs triggered by passive infrared motion detectors.

See http://www.azaryia.com/ for one project that uses it.

PIR1 : GPIO5
PIR2 : GPIO6
PIR3 : GPIO7
PIR4 : GPIO8
PIR5 : GPIO9
PIR6 : GPIO10
PIR7 : GPIO11
PIR8 : GPIO12

Buttons board

For dealing with simple inputs.

Used with node.js for the sampling sequencer at https://github.com/luberlu/bloopController

A1 : GPIO17
A2 : GPIO27

B1 : GPIO22
B2 : GPIO10
B3 : GPIO9
B4 : GPIO11
B5 : GPIO5

Hexadecimal coding wheel :

1 : GPIO6
2 : GPIO13
4 : GPIO19
8 : GPIO26

.

Discussions

Ted Yapo wrote 02/21/2017 at 17:01 point

Can you show the different colors of the 9 LEDs on the rainbow board?

  Are you sure? yes | no

Yann Guidon / YGDES wrote 02/21/2017 at 17:06 point

hopefully, soon, when I test them :-)

However the camera might not render the colors accurately but I'll keep that in mind.

  Are you sure? yes | no