Our forum user Paddy helped me to make following codes but i have one problem when i press button liquor /wine start pouring and flowmeter start counting pulses than when it read desired pulse such as MEASURE_SMALL = 80 it send signal to first solenoid to stop pouring than there is 2nd solenoid clean = LED(25) which should turn on for 2 seconds then stop. but when it comes to turn on 2nd solenoid my relay start fluctuating. no matter what i do even led will be flickering also it does not stop in 2 seconds it keep running more than 5 seconds. there is also auto stop function to stop solenoid LED(17) in 10 seconds just incase if flowmeter failed to send pulses.
i am using resistors and NPN transistor to turn on relays.
Project : liquor / wine dispenser
any idea what could be wrong ?
Code: Select all
from gpiozero import Button, LED
from signal import pause
from time import sleep
import threading
import time
pulse = Button(23) # flowmeter pin
button_small = Button(18) # first button to pour small
button_medium = Button(21) # 2nd button to pour medium
button_big = Button(22) # 3rd button to pour big
solenoid = LED(17) # first solenoid to start pour
clean = LED(25) # second solenoid to clean tap and flowmeter.
GAS_PAUSE = 2.0
TIME_OUT = 10.0
MEASURE_SMALL = 80
MEASURE_MEDIUM = 130
MEASURE_BIG = 200
def pour_small():
start_pour(MEASURE_SMALL)
def pour_medium():
start_pour(MEASURE_MEDIUM)
def pour_big():
start_pour(MEASURE_BIG)
def kill_loop():
global kill_time
while True:
if time.time() > kill_time:
solenoid.off()
time.sleep(1.0)
kill_time = 0.0
t = threading.Thread(target=kill_loop)
t.daemon = True
t.start()
def start_pour(amount):
global count, count_cut_off, kill_time
count_cut_off = amount
count = 0
solenoid.on()
kill_time = time.time() + TIME_OUT
def count_pulse():
global count, count_cut_off
count += 1
if count >= count_cut_off:
solenoid.off()
clean.on() # run flow meter cleaning solenoid with food grade gas
sleep(GAS_PAUSE) #keep clean mode for 2 second
clean.off() # turn off clean mode enjoy drink
pulse.when_released = count_pulse
button_small.when_pressed = pour_small
button_medium.when_pressed = pour_medium
button_big.when_pressed = pour_big
count = 0
count_cut_off = MEASURE_MEDIUM
import tkinter as tk
root = tk.Tk()
root.wm_title('Wine Dispencer')
button_frame = tk.Frame(root)
button_frame.pack(fill=tk.X, side=tk.BOTTOM)
small_button = tk.Button(button_frame, text='Pour Small', command=pour_small)
medium_button = tk.Button(button_frame, text='Pour Medium', command=pour_medium)
big_button = tk.Button(button_frame, text='Pour Full Glass', command=pour_big)
button_frame.columnconfigure(0, weight=1)
button_frame.columnconfigure(1, weight=1)
button_frame.columnconfigure(2, weight=1)
small_button.grid(row=0, column=0, sticky=tk.W+tk.E)
medium_button.grid(row=0, column=1, sticky=tk.W+tk.E)
big_button.grid(row=0, column=2, sticky=tk.W+tk.E)
root.mainloop() # do this instead of the pause() used in the gpiozero code
