Goodwe data LCD display

goodwe-lcd.py

#!/usr/bin/python

# https://raspberrytips.nl/raspberry-pi-goodwe-zonnepaneel-omvormer/
# 25/08/2018 - Richard IJzermans

import sys
import smbus
import time
import datetime
import json
import urllib

# Vul hier je Goodwe PV master gebruikersnaam in
USERNAME = 'GEBRUIKERSNAAM'

I2C_ADDR  = 0x3F # I2C device address
LCD_WIDTH = 20   # Maximum characters per line

LCD_CHR = 1 # Mode - Sending data
LCD_CMD = 0 # Mode - Sending command

LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line
LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line

LCD_BACKLIGHT  = 0x08  # On 0X08 / Off 0x00

ENABLE = 0b00000100 # Enable bit

E_PULSE = 0.0005
E_DELAY = 0.0005

bus = smbus.SMBus(1) # Rev 2 Pi uses 1

def lcd_init():
  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):
  bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT
  bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT
  bus.write_byte(I2C_ADDR, bits_high)
  lcd_toggle_enable(bits_high)
  bus.write_byte(I2C_ADDR, bits_low)
  lcd_toggle_enable(bits_low)

def lcd_toggle_enable(bits):
  time.sleep(E_DELAY)
  bus.write_byte(I2C_ADDR, (bits | ENABLE))
  time.sleep(E_PULSE)
  bus.write_byte(I2C_ADDR,(bits & ~ENABLE))
  time.sleep(E_DELAY)

def lcd_string(message,line):
  message = message.ljust(LCD_WIDTH," ")
  lcd_byte(line, LCD_CMD)
  for i in range(LCD_WIDTH):
    lcd_byte(ord(message[i]),LCD_CHR)

def main():

  lcd_init()

  while True:
  
    try:
		jsonfile = json.load(urllib.urlopen('https://eu.goodwe-power.com/Mobile/GetMyPowerStationByUser?userName='+USERNAME))

    except ValueError:
		line1 = '***'
		line2 = 'Error kan data niet'
		line3 = 'inladen...'
		line4 = '***'

    else:
		percent = int(float(jsonfile[0]['currentPower'][:-2]) / (float(jsonfile[0]['capacity'][:-2])/100))
		line1 = time.strftime("%d.%m.%Y %H:%M")
		line2 = 'Power: ' + jsonfile[0]['currentPower'] + ' ' + str(percent) + '%'
		line3 = 'Today: ' + jsonfile[0]['value_eDayTotal']
		line4 = 'Total: ' + jsonfile[0]['value_eTotal']	
		
    lcd_string( line1 ,LCD_LINE_1)  
    lcd_string( line2 ,LCD_LINE_2)
    lcd_string( line3 ,LCD_LINE_3)
    lcd_string( line4 ,LCD_LINE_4)
    
    time.sleep(60)

if __name__ == '__main__':

  try:
    main()
  except KeyboardInterrupt:
    pass
  finally:
    lcd_byte(0x01, LCD_CMD)