python-periphery and 2G-IOT

nopnop2002 · Published in 2017-9-9 18:17:13

Edited by nopnop2002 at 2017-9-10 22:08

surfero75 replied at 2017-9-9 15:14
Is there a way for work witch DHT22 sensor?

NO

DHT11/22 needs high-speed digital input.
This library is very slow.
DHT11/22 isn't suitable for Linux.

surfero75 · Published in 2017-9-12 06:05:09

Thanks,
A question: how can i show IP address by lcd1602?

nopnop2002 · Published in 2017-9-12 18:02:31

Edited by nopnop2002 at 2017-9-12 18:06

surfero75 replied at 2017-9-12 06:05
A question: how can i show IP address by lcd1602?

YES

--- lcd2.py ---

#!/usr/bin/python
#-*- encoding: utf-8 -*-
#import
from periphery import GPIO
import time
import sys
# Define GPIO to LCD mapping
GPIO.LCD_RS = GPIO(101, "out")
GPIO.LCD_E = GPIO(121, "out")
GPIO.LCD_D4 = GPIO(122, "out")
GPIO.LCD_D5 = GPIO(123, "out")
GPIO.LCD_D6 = GPIO(124, "out")
GPIO.LCD_D7 = GPIO(125, "out")
# Define some device constants
LCD_WIDTH = 16 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005
def main(message):
# Main program block
# GPIO_setwarnings(False)
# GPIO_setmode(GPIO_BCM) # Use BCM GPIO numbers
# GPIO_setup(LCD_E, GPIO_OUT) # E
# GPIO_setup(LCD_RS, GPIO_OUT) # RS
# GPIO_setup(LCD_D4, GPIO_OUT) # DB4
# GPIO_setup(LCD_D5, GPIO_OUT) # DB5
# GPIO_setup(LCD_D6, GPIO_OUT) # DB6
# GPIO_setup(LCD_D7, GPIO_OUT) # DB7
# Initialise display
lcd_init()
while True:
# Send some test
lcd_string("OrangePi 2G-IOT",LCD_LINE_1)
lcd_string("16x2 LCD Test",LCD_LINE_2)
time.sleep(3) # 3 second delay
# Send some text
lcd_string(message[0],LCD_LINE_1)
lcd_string("",LCD_LINE_2)
if (len(message) == 2):
lcd_string(message[1],LCD_LINE_2)
time.sleep(3) # 3 second delay
def lcd_init():
# Initialise display
lcd_byte(0x33,LCD_CMD) # 110011 Initialise
lcd_byte(0x32,LCD_CMD) # 110010 Initialise
lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction
lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off
lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size
lcd_byte(0x01,LCD_CMD) # 000001 Clear display
time.sleep(E_DELAY)
def lcd_byte(bits, mode):
# Send byte to data pins
# bits = data
# mode = True for character
# False for command
GPIO.LCD_RS.write(mode) # RS
# High bits
GPIO.LCD_D4.write(False)
GPIO.LCD_D5.write(False)
GPIO.LCD_D6.write(False)
GPIO.LCD_D7.write(False)
if bits&0x10==0x10:
GPIO.LCD_D4.write(True)
if bits&0x20==0x20:
GPIO.LCD_D5.write(True)
if bits&0x40==0x40:
GPIO.LCD_D6.write(True)
if bits&0x80==0x80:
GPIO.LCD_D7.write(True)
# Toggle 'Enable' pin
lcd_toggle_enable()
# Low bits
GPIO.LCD_D4.write(False)
GPIO.LCD_D5.write(False)
GPIO.LCD_D6.write(False)
GPIO.LCD_D7.write(False)
if bits&0x01==0x01:
GPIO.LCD_D4.write(True)
if bits&0x02==0x02:
GPIO.LCD_D5.write(True)
if bits&0x04==0x04:
GPIO.LCD_D6.write(True)
if bits&0x08==0x08:
GPIO.LCD_D7.write(True)
# Toggle 'Enable' pin
lcd_toggle_enable()
def lcd_toggle_enable():
# Toggle enable
time.sleep(E_DELAY)
GPIO.LCD_E.write(True)
time.sleep(E_PULSE)
GPIO.LCD_E.write(False)
time.sleep(E_DELAY)
def lcd_string(message,line):
# Send string to display
message = message.ljust(LCD_WIDTH," ")
lcd_byte(line, LCD_CMD)
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
if __name__ == '__main__':
argv = sys.argv
argc = len(argv)
if (argc == 1):
print 'Usage: python %s line1_message [line2_message]' % argv[0]
quit()
message = []
message.append(argv[1])
if (argc == 3):
message.append(argv[2])
# print message
try:
main(message)
except KeyboardInterrupt:
pass
finally:
lcd_byte(0x01, LCD_CMD)
lcd_string("Goodbye!",LCD_LINE_1)
# GPIO_cleanup()

Copy code

--- lcd2.sh ---

#!/bin/bash
set -x
ipaddr=`ifconfig wlan0 |grep "inet addr" |awk {'print $2'} |cut -f2 -d:`
if [ -n "$ipaddr" ]; then
sudo python ./lcd2.py "My IP" $ipaddr
fi

Copy code

chmod 777 lcd2.sh
./lcd2.sh

surfero75 · Published in 2017-9-12 19:21:21

Could the script be worth to display any command in the shell? for example ram state, cpu, disk and mp3 player, etc ...?
Thank you very much for your contribution

nopnop2002 · Published in 2017-9-12 21:52:36

surfero75 replied at 2017-9-12 19:21
Could the script be worth to display any command in the shell? for example ram state, cpu, disk and ...

YES
Try everything.

jhonoryza · Published in 2017-9-15 17:27:10

i use i2cdetect -y 0 but i can't detect any device on i2c bus 0
my hardware connection is right, and i already test with arduino and it can detect the address
but when i use 2g iot i can't detect my device, how to detect i2c device ??is there something i miss?

nopnop2002 · Published in 2017-9-15 18:27:16

Edited by nopnop2002 at 2017-9-15 18:36

@jhonoryza
Maybe your connection is right.
i2cdetect in 2g-iot can't be trusted.
I don't trust at all.

Armen · Published in 2017-11-6 17:31:11

Are you tested SPI on this board? I confirm that I2C and UART work but I cannot found any spidev

nopnop2002 · Published in 2017-11-6 22:38:05

Edited by nopnop2002 at 2017-11-6 22:43

No.
I cannot found any spidev.

orangepi@OrangePi:~$ ls /dev/spi*
ls: cannot access '/dev/spi*': No such file or directory
orangepi@OrangePi:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.3 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.3 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Armen · Published in 2017-11-7 00:35:36

nopnop2002 replied at 2017-11-6 22:38
No.
I cannot found any spidev.

Thanks for answer. then we only can wait