main.py

from wifi_manager import WifiManager
from machine import Pin, SoftI2C, WDT
import urequests, utime, ssd1306

#VARIABLES
sort = {'Diesel':False,'E10':True,'E5':False}#choose important fuel
lat =               #set your latitute
lng =               #set your longitude
radius = 3          #needs to be adjusted if memory error or no stations close enough
key = ''            #insert api key
difference = 0.04#difference between mean and current price to blink in dec percentage
refreshTime = 10#minutes after which new data is requested 

#display
i2c = SoftI2C(scl=Pin(5), sda=Pin(4))
display = ssd1306.SSD1306_I2C(128, 32, i2c)

display.text('connecting wifi',0,0,1)
display.text('or setup wifi on',0,8,1)
display.text('192.168.4.1',0,16,1)
display.show()

#wifi
wm = WifiManager('Petrol-Station','12345678')
wm.connect()

#key for sorting results
def sortKey():
    for fuel in sort:
        if sort[fuel]:
            return fuel

#data collecting
rawStations = {}
meanPrice = -1
def getData():
    global meanPrice, rawStations
    print('collecting Data')
    
    try:
        stationsresponse = urequests.get('https://creativecommons.tankerkoenig.de/json/list.php?lat='+str(lat)+'&lng='+str(lng)+'&rad='+str(radius)+'&sort=dist&type=all&apikey='+key).json()
        rawStations = stationsresponse['stations']
    except:
        print('stations error')
        pass
    #gather meanPrice
    try:
        meanresponse = urequests.get('https://creativecommons.tankerkoenig.de/api/v4/stats?apikey='+key).json()
        meanPrice = meanresponse[sortKey()]['mean']
    except:
        print('mean error')
        meanPrice = -1
        pass

#data preparation
cheapest = {}
def prepData():
    global cheapest
    if rawStations == {}:
        return
    stations = {}
    for station in rawStations[:5]:#reducing to 5 stations and cleaining data
        if station['brand'] not in stations:
            stations[station['brand']] = {'brand':station['brand'],'isOpen':station['isOpen'],'E5':station['e5'],'E10':station['e10'],'Diesel':station['diesel']}
    #finding cheapest station
    if stations != {}:
        cheapest = list(stations.values())[0]
    for station in stations:
        stationData = stations[station]
        if stationData[sortKey()] < cheapest[sortKey()] and stationData['isOpen']:
            cheapest = stations[station]

#show station data on display
counter = 1
def visualize(station:dict, white=False):
    if station == {} or not station['isOpen']:
        display.fill(0)
        display.show()
        return
    
    color = 1
    display.fill(0)
    if white:
        color = 0
        display.fill(1)
        
    brand = station['brand']
    shift = int((8-(len(brand)/2))*8)
    display.text(brand,shift ,0,color)
    display.text('Diesel:',0,8,color)
    display.text(station['Diesel'],85,8,color)
    display.text('E10:',0,16,color)
    display.text(station['E10'],85,16,color)
    display.text('Super:',0,24,color)
    display.text(station['E5'],85,24,color)
       
    if meanPrice != -1:#underline if meanPrice is active
        for x in range((len(brand)*8)):
            display.pixel(shift + x,7,color)

    display.text(int(refreshTime - counter/30),117,0,color)
    
    display.show()

display.text('wifi connected',0,24,1)
display.show()

getData()
prepData()
animToggle = True
while True:
    utime.sleep(2)
    if cheapest != {} and cheapest[sortKey()]<(meanPrice*(1-difference)):
        visualize(cheapest, animToggle)
        animToggle = not animToggle
    else:
        visualize(cheapest)  
    
    if counter == (refreshTime*60)/2:
        getData()
        prepData()
        counter = 0
    counter = counter+1