====== Raspberry Pi Semafor ======

===== Raspberry Pi B+ =====

{{::gpio_b_plus.jpg|}}

===== Spajanje računalom na Raspberry PI B+ =====
[[project:raspberry_pi_network_connection|Spajanje računalom na Raspberry PI B+ preko mreže]]

===== Spajanje LED na Raspberry PI B+ =====

{{::led.png|}}

Raspberry pin označen sa GND spoji na LED pin Cathode (-)

Raspberry pin označen sa 9 spoji na LED pin Anode (+)

{{::gpio_b_wpi_marks_9.jpg|}}

komandom gpio konfiguriraj port 9 kao out
<code>
gpio mode 9 out
</code>

komandom gpio postavi port 9 na 1 :: LED bi trebala emitirati svjetlo
<code>
gpio write 9 1
</code>

komandom gpio postavi port 9 na 0 :: LED ne emitira svjetlo
<code>
gpio write 9 0
</code>

===== Spajanje crvene, žute i zelene LED na Raspberry PI B+ =====

{{::gpio_b_wpi_marks_7_8_9.jpg|}}

===== Isprobavanje semafora =====
u terminal natipkati
<code>
 crveno=7
   zuto=9
 zeleno=8

 gpio mode $crveno out
 gpio mode $zuto   out
 gpio mode $zeleno out

 gpio write $crveno 1
 gpio write $zuto   1
 gpio write $zeleno 1
</code>

Sve tri LED bi trebale svijetliti.

<code>
 gpio write $crveno 0
 gpio write $zuto   0
 gpio write $zeleno 0
</code>

Sve tri LED bi trebale biti ugašene.


===== Semafor bash skripta =====
preko terminala (ssh) na Rasperry Pi B+ napravi file semafor
<code>
mcedit semafor
</code>

i upiši slijedeći source

<code>
#!/bin/bash

crveno=7
  zuto=9
zeleno=8

gpio mode $crveno out
gpio mode $zuto   out
gpio mode $zeleno out

function mysleep {
txt=$1
sec=$2
echo -n "$txt $sec : "
for i in `seq 1 $sec`;
do
echo -n "$i "
sleep 1
done
echo
}

function postavi {
gpio write $crveno $1
gpio write $zuto   $2
gpio write $zeleno $3
mysleep $4 $5
}

postavi 1 1 1 upali_sve    2
postavi 0 0 0 ugasi_sve    2

while true; do

postavi 1 0 0 crveno      10
postavi 1 1 0 crveno_zuto  2
postavi 0 0 1 zeleno      10
postavi 0 1 0 zuto         2

done
</code>

postavi execute prava za semafor skriptu utipkavši
<code>
 chmod +x semafor
</code>

===== Pokretanje semafor skripte =====
<code>
 ./semafor
</code>

===== Fotografije =====

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