Chapter 3 LEDBar Graph
74
28
29
30
31
32
33
34
35
36
37
38
39
led_on
(
pins
[
i
]);
delay
(
100
);
led_off
(
pins
[
i
]);
}
for
(
i
=
leds
-
1
;
i
>-
1
;
i
--){
//make led on from right to left
led_on
(
pins
[
i
]);
delay
(
100
);
led_off
(
pins
[
i
]);
}
}
return
0
;
}
In the program, configure the GPIO0-GPIO9 to output mode. Then, in the endless “while” cycle of main
function, use two “for” cycle to realize flowing water light from left to right and from right to left.
while
(
1
){
for
(
i
=
0
;
i
<
leds
;
i
++){
//make led on from left to right
led_on
(
pins
[
i
]);
delay
(
100
);
led_off
(
pins
[
i
]);
}
for
(
i
=
leds
-
1
;
i
>-
1
;
i
--){
//make led on from right to left
led_on
(
pins
[
i
]);
delay
(
100
);
led_off
(
pins
[
i
]);
}
}
Python Code 3.1.1 LightWater
First observe the project result, and then analyze the code.
1. Use cd command to enter 03.1.1_LightWater directory of Python code.
cd ~/Freenove_Ultimate_Starter_Kit_for_Raspberry_Pi/Code/Python_Code/03.1.1_LightWater
2. Use Python command to execute Python code “LightWater.py”.
python LightWater.py
After the program is executed, you will see that LEDBar Graph starts with the flowing water way to be turned
on from left to right, and then from right to left.
The following is the program code:
1
2
3
4
5
6
7
8
i m port
RPi
.
GPIO
a s
GPIO
i m port
time
ledPins
=
[
11
,
12
,
13
,
15
,
16
,
18
,
22
,
3
,
5
,
24
]
d e f
setup
( ):
p r int
(
'Program is starting...'
)
GPIO
.
setmode
(
GPIO
.
BOARD
)
# Numbers GPIOs by physical location
Summary of Contents for Ultimate Starter Kit
Page 1: ...Free your innovation Freenove is an open source electronics platform www freenove com ...
Page 117: ...117 Chapter 9 Potentiometer RGBLED www freenove com support freenove com Hardware connection ...
Page 155: ...155 Chapter 14 Relay Motor www freenove com support freenove com Hardware connection OFF 3 3V ...
Page 173: ...173 Chapter 16 Stepping Motor www freenove com support freenove com Hardware connection ...
Page 239: ...239 Chapter 22 Matrix Keypad www freenove com support freenove com Circuit Schematic diagram ...
Page 240: ...Chapter 22 Matrix Keypad 240 www freenove com support freenove com Hardware connection ...
