[PYTHON] Make an umbrella reminder with Raspberry Pi Zero W
I'm an amateur like electronic work, but to get started
- Raspberry Pi Zero W
- LCD
- Human Sensor
Make an umbrella reminder using. There is a weather app on your mobile phone that says "When it's about to rain, what time is it in the morning?", But when I go out, I sometimes forget it. .. It's like putting it in the front door and displaying the probability of precipitation on the LCD triggered by the input of the motion sensor. I also want to use a power battery. In some cases, consider reducing power consumption. It was completed for the time being! There is nothing technically advanced.
-[x] How to use LCD -[x] How to use the motion sensor -[x] Acquisition of precipitation probability -[x] Combination of each function -[x] Power supply battery -[] Power consumption reduction
Figure of completion
It turned out to be something like this. If you are properly prepared at the entrance, you will be notified properly!
I would like to verify how long this battery will last.
What you prepared
- Raspberry Pi Zero W
- GPIO Hammer Header -[OSOYOO Electronic Parts Set](https://www.amazon.co.jp/%E5%88%9D%E5%BF%83%E8%80%85%E6%BC%94%E7%BF%92 % E7% 94% A8% E3% 83% 91% E3% 83% BC% E3% 83% 84% E3% 82% BB% E3% 83% 83% E3% 83% 88-% E5% 9B% 9E% E8% B7% AF% E9% 85% 8D% E7% B7% 9A% E5% 9B% B3% E3% 81% A8% E3% 82% B5% E3% 83% B3% E3% 83% 97% E3% 83% AB% E3% 82% B9% E3% 82% B1% E3% 83% 83% E3% 83% 81% E6% 9C% 89% E3% 82% 8A-% E3% 82% B9% E3% 82 % BF% E3% 83% BC% E3% 82% BF% E3% 83% BC% E5% AD% A6% E7% BF% 92% E3% 82% AD% E3% 83% 83% E3% 83% 88 -% E3% 83% AA% E3% 83% AC% E3% 83% BC% E3% 83% A2% E3% 82% B8% E3% 83% A5% E3% 83% BC% E3% 83% AB% E5% 88% B6% E5% BE% A1-% E8% B5% A4% E5% A4% 96% E7% B7% 9A% E3% 83% AA% E3% 83% A2% E3% 82% B3% E3 % 83% B3% E7% AD% 89IoT% E3% 82% 92% E5% AE% 9F% E8% B7% B5% E3% 81% 99% E3% 82% 8B% E9% 9B% BB% E5% AD % 90% E9% 83% A8% E5% 93% 81% E3% 82% BB% E3% 83% 83% E3% 83% 88 / dp / B01M6ZFNSS)
I bought the GPIO Hammer Header because I'm not confident in soldering. The OSOYOO electronic component set is recommended for people with no experience in electronic work. It's cheap, the tutorial is easy, and I'm satisfied.
How to use LCD
See below. http://osoyoo.com/ja/2016/04/10/drive-16x2-lcd-with-raspberry-pi/ http://osoyoo.com/ja/2016/06/01/drive-i2c-lcd-screen-with-raspberry-pi/
How to use the motion sensor
See below. http://osoyoo.com/ja/2016/07/14/motionsensor-pi/
Obtaining the probability of precipitation
I created the following child article. Getting Precipitation Probability from XML in Python
Combination of each function
It was completed, but by the time I got to this point, I connected the VCC and GND of the LCD in reverse and broke one: cry:
--Improvements -Requests.get () is called once for each of ~~ 12-18h and 18-24h. ~~ --2017/08/13 Addendum: Fixed using the tuple comprehension (strictly, generator?) Taught by @shiracamus. --I don't know how to find out if it is backlit. --I tried bus.read_byte (), but for some reason I can't see only the backlight information.
umbrella_reminder.py
#!/usr/bin/env python2
# coding: utf-8
# If motion sensor detected a person, get and show today's rain fall chance
# of Yokohama (East of Kanagawa) on LCD for 30 seconds.
# If not, wait 1 second and check again.
# for general use
import time
# for motion sensor (referred to as "MS")
import RPi.GPIO as GPIO
# for LCD
import smbus
# for rain fall chance
import datetime
import requests
import xml.etree.ElementTree as ET
# constants for motion sensor
MS_GPIO_INPUT_PIN = 14
# constants for LCD
LCD_I2C_ADDR = 0x3F
LCD_CHR_DISP_WIDTH = 16
LCD_CHR_DRAM_WIDTH = 0x28
LCD_NUM_LINES = 2
LCD_PULSE_WAIT = 0.0005
LCD_DELAY_WAIT = 0.0005
I2C_CMD_MODE = 0x00
I2C_CHR_MODE = 0x01
I2C_ENABLE_BIT = 0x04
I2C_BACKLIGHT_OFF = 0x00
I2C_BACKLIGHT_ON = 0x08
bus = smbus.SMBus(1)
def initialize_gpio_for_ms():
GPIO.setwarnings(False)
GPIO.cleanup()
GPIO.setwarnings(True)
GPIO.setmode(GPIO.BCM)
GPIO.setup(MS_GPIO_INPUT_PIN, GPIO.IN, pull_up_down = GPIO.PUD_UP)
def initialize_lcd():
send_byte_to_lcd(0x33, I2C_CMD_MODE) # establish 4 bits mode
send_byte_to_lcd(0x32, I2C_CMD_MODE) # establish 4 bits mode
send_byte_to_lcd(0x01, I2C_CMD_MODE) # 000001 clear display, return cursor to the home position
# send_byte_to_lcd(0x02, I2C_CMD_MODE) # 000010 return cursor to the home position
send_byte_to_lcd(0x06, I2C_CMD_MODE) # 000110 cursor move direction: increment, display shift: disabled
send_byte_to_lcd(0x0C, I2C_CMD_MODE) # 001100 display on, cursor off, blink off
# send_byte_to_lcd(0x10, I2C_CMD_MODE) # 010000 move cursor without writing, not used for initialization
send_byte_to_lcd(0x28, I2C_CMD_MODE) # 101000 4 bits mode, use 2 lines, use 5 dots font
time.sleep(LCD_DELAY_WAIT)
def send_byte_to_lcd(lcd_data, i2c_mode):
first_data = ((lcd_data & 0xF0) << 0) | i2c_mode
second_data = ((lcd_data & 0x0F) << 4) | i2c_mode
write_and_toggle_lcd_enable(first_data)
write_and_toggle_lcd_enable(second_data)
def write_and_toggle_lcd_enable(data):
time.sleep(LCD_DELAY_WAIT)
bus.write_byte(LCD_I2C_ADDR, (data | I2C_ENABLE_BIT))
time.sleep(LCD_PULSE_WAIT)
bus.write_byte(LCD_I2C_ADDR, (data & ~I2C_ENABLE_BIT))
time.sleep(LCD_DELAY_WAIT)
def turn_off_lcd():
send_byte_to_lcd(0x08, (I2C_CMD_MODE | I2C_BACKLIGHT_OFF))
def turn_on_lcd():
send_byte_to_lcd(0x0C, (I2C_CMD_MODE | I2C_BACKLIGHT_ON))
def move_cursor(line, offset):
if line < 0 or LCD_NUM_LINES <= line:
print('invalid line')
return False
if offset < 0 or LCD_CHR_DRAM_WIDTH <= offset:
print('invalid offset')
return False
if line == 0:
line_data = 0x00
elif line == 1:
line_data = 0x40
data = 0x80 + line_data + offset
send_byte_to_lcd(data, (I2C_CMD_MODE | I2C_BACKLIGHT_ON))
return True
def show_text_to_line(message, line):
if move_cursor(line, 0) == False:
return
message = message.ljust(LCD_CHR_DISP_WIDTH)
for i in range(LCD_CHR_DISP_WIDTH):
send_byte_to_lcd(ord(message[i]), (I2C_CHR_MODE | I2C_BACKLIGHT_ON))
def get_yokohama_rain_fall_chances():
today = datetime.datetime.today().strftime("%Y/%m/%d")
url = 'http://www.drk7.jp/weather/xml/14.xml'
response = requests.get(url)
root = ET.fromstring(response.content)
return ((period.get('hour'), period.text)
for area in root.iter('area')
if area.get('id').encode('utf-8') == 'Eastern'
for info in area.findall('info')
if info.get('date') == today
for period in info.find('rainfallchance').findall('period'))
def main():
initialize_gpio_for_ms()
initialize_lcd()
target_periods = '12-18', '18-24'
while True:
motion_detected = True if GPIO.input(MS_GPIO_INPUT_PIN) != 0 else False
if motion_detected:
print('motion detected')
turn_on_lcd()
curr_line = 0
for period, rain_fall_chance in get_yokohama_rain_fall_chances():
if period in target_periods:
text = period + 'h ' + rain_fall_chance + '%'
show_text_to_line(text, curr_line)
print(text)
curr_line += 1
if curr_line >= LCD_NUM_LINES:
break
time.sleep(30)
else:
print('motion not detected')
turn_off_lcd()
time.sleep(1)
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
finally:
send_byte_to_lcd(0x01, I2C_CMD_MODE)
turn_on_lcd()
show_text_to_line('Goodbye!', 0)
GPIO.cleanup()
Power supply battery
Looking at various things, I was worried that the protection circuit works and the output stops in the case of a small current in recent mobile batteries, but I was worried that I could use my own battery normally. .. I wonder if the protection circuit is not working because it is cheap? Or is there a decent amount of current flowing? I also want to measure the power consumption. ANKER Astro Slim2
Reduced power consumption
I haven't done it yet.
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