Keypad with email and pul-up resistor.

[siafu]

http://cocoontech.com/forums/topic/24995-pull-up-resistor-wiring/
 
Hello All,
 
I accidentally posted the above questions to the wrong forum, I received some help, but not enough to fix my issue.
 
Basically i wanted to know how to hook up a resistor so it stops sending more than one email every time someone used the keypad to open the door.
 
Now after installing the resistor, I get continuous emails one every second. The keypad still works, when the correct code is entered, but just sends email after email.
 
Below is what I hooked up and the PLC code.
 
Can someone help me with this further?
 
 
START    
    TSTEQ RAM1 0  
    CALLSUB SET_OP1   
    CALLSUB CHK4LOW   
    TSTEQ OP1[1000] 1  
    SET OP1 0  
    TSTGT IP2 0  
    CALLSUB KEYMAIL   
    NOP    
    END    

CHK4LOW:
    TSTEQ IP2 0  
    SET RAM1 0  
    RET    

SET_OP1:
    TSTEQ IP2 1 RAM1
    SET OP1 1  
    RET    

KEYMAIL:
    EMAIL EM5   
    RET
 
DOORMAIL:
    EMAIL EM1   
    RET
 

 

[az1324]

You may want to wait for one of the gurus, but maybe something like this:
 
 

START
    SET RAM1 0
    SET RAM2 0
LOOP:
    CALLSUB CHKIP2
    CALLSUB CHKIP1
    GOTO LOOP
END    

CHKIP2:
    TSTEQ IP2[10] RAM2   //if input 2 (debounced) is the same as when we last checked it
    GOTO CHKIP2_E     //goto end
    SET RAM2 IP2         //otherwise, store the new value of input 2
    TSTEQ RAM2 0         //if the input has changed to 0
    GOTO CHKIP2_E     //goto end
    SET OP1 1            //otherwise it has changed to 1, so set output 1
    EMAIL EM5            //and send email 5
CHKIP2_E:
    TSTEQ OP1[1000] 1   //if output 1 has been set to 1 for 1 second
    SET OP1 0 //set it to 0
RET    
    
CHKIP1:
    TSTEQ IP1[10] RAM1   //if input 1 (debounced) is the same as when we last checked it
    GOTO CHKIP1_E      //goto end
    SET RAM1 IP1         //otherwise, store the new value of input 1
    TSTEQ RAM1 1         //if the input has changed to 1
    EMAIL EM1            //then send email 1
CHKIP1_E:
    RET
 
 

 

 

[apostolakisl]

Please see my comment on the other thread.
 
As far as your resistor.  You must have it wired in such that you are bringing IP1 voltage up to the threshold of being "on" (or 1).  This is why it is firing off emails non-stop.  I would just get rid of that resistor and use the non-blocking delay as I stated.  
 
When your keypad is closing the circuit, you are probably getting an on/off/on.  The delay function will cause it to ignore the first on.

 

[siafu]

Thank you Lou, I resolved the massive emails, but still have trouble with the two emails per push.

 

[az1324]

Lou, you think that tuning a delay is preferable to detecting only changes in state?  Not to mention the poor readability of that other code.

 

[apostolakisl]

Lou, you think that tuning a delay is preferable to detecting only changes in state?  Not to mention the poor readability of that other code.

 
No, you are right.  I only quickly looked at the code at first and thought I saw this issue taken care of, but it was setting ram values for something un-related.  I commented on the other thread he started a while ago correcting the issue.

 

[CAI_Support]

Using a circuit like this attached picture, you could use one analog input to decode which button is pushed. Just need to be careful those resistors value.

 

[CAI_Support]

For example, each row change 2.5V and each column change 0.5V

 

[CAI_Support]

Would resistor value like this drawing make sense?

 

[siafu]

Hi Cai,
 
This looks like something complicate to me, but I don't have much knowledge about electronics, just learning bit by bit from folks on this site.

 

[CAI_Support]

It is actually fairly easy, look this keypad:
http://www.ebay.com/itm/261201603279
half the wires are connected to R1-R4, another half connected to R5-R8. the keypad matrix are wired inside.

 

[CAI_Support]

This one has better explanation how internally operates
http://www.ebay.com/itm/221173172675
but it is a 3x4 keypad.

 

[siafu]

Thanks Cai, but we got the keypad that I have working, it was an issue with it sending to many signals at once, but it was resolved with code thanks to Lou and AZ1324. Both had different codes that worked perfectly for my applications.
 
If anyone is interested in seeing the discussion about my keypad (and other things) and how we got it working see the following link.
 
http://cocoontech.com/forums/topic/24995-pull-up-resistor-wiring/page-1

 

[CAI_Support]

Great to know, Siafu.