Layout

for real view, use command bellow. (if gpio installed)

gpio readall

	PIN No.		PIN No.
3.3V	1 (*1)		2	5V
GPIO 2 (*2)	3		4	5V
GPIO 3 (*2)	5		6	GND
GPIO 4	7		8	GPIO 14
GND	9		10	GPIO 15
GPIO 17	11		12	GPIO 18
GPIO 27	13		14	GND
GPIO 22	15		16	GPIO 23
3.3V	17		18	GPIO 24
GPIO 10	19		20	GND
GPIO 9	21		22	GPIO 25
GPIO 11	23		24	GPIO 8
GND	25		26	GPIO 7
ID_SD(*3)	27		28	ID_SC
GPIO 5	29		30	GND
GPIO 6	31		32	GPIO 12
GPIO 13	33		34	GND
GPIO 19	35		36	GPIO 16
GPIO 26	37		38	GPIO 20
GND	39		40	GPIO 21

• *1 Solder (reverse side) is square
• *2 GPIO with Resist
• *3 I2C EEPROM

Output Limit

• Max 16mA per GPIO 1pin
• Amount 50mA on All out GPIO pins

Input Limit

• range 0V - 3.3V
  • 0V - 0.8V -> read 0V
  • 0.8V - 1.3V -> unknown
  • 1.3V - 3.3V -> read 3.3V

Controll by Shell

/sys/class/gpio (ex. for GPIO 21)

1. write GPIO No. to use (Not pinNo)

echo 21 > /sys/class/gpio/export

will create "/sys/class/gpio/gpio21" directory

2. write in/out to gpio direction file (ex. for output pin)

echo out > /sys/class/gpio/gpio21/direction

3. read/write to in/out

# for In pin (read)
cat /sys/class/gpio/gpio21/value

# for Out pin (write)
## ON 3.3V
echo 1 > /sys/class/gpio/gpio21/value
## OFF
echo 0 > /sys/class/gpio/gpio21/value

4. use finished

echo 21 > /sys/class/gpio/unexport

will delete "/sys/class/gpio/gpio21" directory

Controll by Python

Example

import RPi.GPIO as GPIO
import time

## GPIO No. mode
GPIO.setmode(GPIO.BCM)
# or
## PIN No. mode
# GPIO.setmode(GPIO.BOARD)

## IN/OUT setting
# PinNo = 20
# GPIO.setup(PinNo, GPIO.OUT)
# GPIO.setup(PinNo, GPIO.IN)

## OUT
# GPIO.output(PinNo, 1)
# GPIO.output(PinNo, 0)
## IN
# GPIO.input(PinNo)


# Example
PinNo = 20
GPIO.setup(PinNo, GPIO.OUT)
try:
    for i in range(30):
        GPIO.output(PinNo, 1)
        time.sleep(1)
        GPIO.output(PinNo, 0)
        time.sleep(1)
        
finally:
    ## GPIO use Finished
    GPIO.cleanup()