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