python - using delay between actions -


i trying communicate python arduino using pyserial library. in code below showing few functions trying switch on or off led based on value returned these functions. want when python telling switch on led, want led switched on 7 seconds, during time if set_forbidden_list returns value, want led switch off , keep switched off until set_forbidden_list becomes empty. heavily appreciated.

def openthedoor(set_accepted_list,set_list_ant_id,set_forbidden_list,set_accepted_list_frozen):     if(((len(set_accepted_list)) >0) & (set_forbidden_list == set()) & ((set_accepted_list_frozen == none) or ((set_accepted_list_frozen & set_accepted_list)== set_accepted_list))):         use_door(1)         delay_for_goodant(1)         print "open gate"     else:         use_door(0)         delay_for_goodant(0)         print "close gate"     set_for_comparison = set(set_accepted_list &  set_list_ant_id)     list_for_comparison = list(set_for_comparison)     return set_for_comparison,list_for_comparison      def establishing_connection():     print ser.read();     ser.write('1')  last_action = -1  def use_door(activate):     global last_action     if(last_action != activate):         send_data(activate)     last_action = activate  def send_data(data):     if (data ==0):         print "manga"         return true     else:         print "muringa"         return false  def delay_for_goodant(data):     print "thenga"     global ser     try:         if (ser == none):             ser = serial.serial("com1",9600,timeout = 0)             print "reconnect"             incoming_data = ser.readline()         else:                           ## turning off led             ser.write('0')             time.sleep(0)             incoming_data2 = ser.readline()     except ioerror:         ser = none

instead of using time.sleep(7) halt program 7 seconds sleep few milliseconds inside loop keeps checking if there value in set_forbidden_list. time.sleep(0) not writing @ all.

for in range(700):    time.sleep(0.01);    if len(set_forbidden_list)==0:         #switchon led

the above loop runs 700 times while each time wait 0.01 seconds , sums 7 seconds.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more