LDmicro Forum - count down timer with lcd

(no subject) (by MGP)

Rajeev and others!

Short questions come through the language differences but there you have translators on the Internet.

A program like this is 1/2 hour of work including testing but:
With such questions no one can help you, it's like asking: I have a motor and would like to build a car, can someone help me.

We need more information and do you have a serial (UART) LCD display? I suspect not and LDmicro need one.

Can you customize a program if it's not 100% your taste?
If not, then it's a waste of time for us

So, what do you have as hardware?

Tue Sep 2 2014, 03:48:45

(no subject) (by Rajeev)

Dear MGP Sir,

Thanks for reply.

Please accept my apologies if I didn't asked perfectly.

I have made simple pre programmed PLC using PIC16F887 with help of LDMICRO and I made PCB with 8 opto isolated Inputs and 8 relay outputs.

I am new to SERIAL UART LCD DISPLAY.

Yes I can customize a program if it's not 100% of my taste.

Now I am trying to make a simple industrial timer with lcd (16x2) of only 99.9 sec with increment and decrement switches also a RESET swith. I have seen few Sample files from LDMICRO and learnt lot of things.

I would be really grateful if could help.

Thanks & regards,

Rajeev

Tue Sep 2 2014, 08:39:08

(no subject) (by MGP)

Do you have a serial lcd display?

Buy one or make one.

http://cq.cx/interface.pl#11

A normal 14 or 16 pins lcd display is not done, too much work.

Otherwise you can build one, which I have.

http://hobbybotics.com/project...cs-serial-lcd-controller-v3-0/

Tue Sep 2 2014, 08:57:58

(no subject) (by Rajeev)

Dear MGP Sir,

Thanks for prompt reply. I really really appreciate for great help.

Please tell me how pic16f887 will talk to LCD. I know how to declare same variables in count up and count down counters but don't know how serial (UART) will transmit same variable value to LCD.

Thanks & best regards,

Rajeev

Tue Sep 2 2014, 15:54:40

(no subject) (by MGP)

Here you have your program.

You need 5 pushbuttons ; xset, xslowup, wslowdn, xrun, xreset.

For set time, push xset and xslowup or xslowdn.
After 1 sec its go faster.

Release xset button and settings are stored in eeprom.

xrun is a button or you can change it in a internal relais contact....

Ydone is the output when time = zero.

The time is displayed on a serial lcd.

The program can always made better but that's up to you.

Wed Sep 3 2014, 16:46:54, download attachment timerupdown999.ld

(no subject) (by MGP)

I have made a error, you must change in rung 5
time <= 999 must be time <= 998

Thu Sep 4 2014, 12:55:51

(no subject) (by Rajeev)

Dear MGP Sir,

Can you guide me if I want to make 2 timer in sequence like Timer one and Timer two, both works same way 99.9 seconds.

We can add two more pushbuttons in your given Program for Timer one and Timer two with 5 pushbuttons xset, xslowup, wslowdn, xrun, xreset.

Also I want to use 20X4 LCD,

(1) Ist line- I want to print "Any Name"(declare character variable) it will be fix in Center.

(2) Second line- I want to print Timer one or Timer two (in character variable) when Timer one is in operation it will show Timer one and when Timer two in operations it will show timer two.

(3) Third line- I want to print working timer duration (in 99.9 seconds), in Timer Set mode I want to use same this line for Timers settings.

(4) Fourth Line- I want to print Timers Set Points in 99.9 format like if Timer one is running it will show Timer one set Point and if Timer two is running than it will show Timer two set point.

I will be really thankful if you could help.

Can you please give in any ref. book or website for Serial (UART) I want to study deeply.

best regards,

Rajeev

Fri Sep 5 2014, 09:12:34

(no subject) (by MGP)

Rajeev, you have everything you need how to do this.
You said you could costumize a program.

As concerned the LCD, every LCD has other control characters, so I can not help you.
This program works also on a 4x20 serial lcd so you can start and look how it works.
Read the manual of the lcd, how to control the cursor.

UART, RS232 you can find millions of pages on this topic on the internet, use google, bing, etc....

https://forum.crystalfontz.com/forum.php

Fri Sep 5 2014, 13:37:33

(no subject) (by Rajeev)

Dear MGP Sir,

Thanks for reply and link for guidance.

Best regards,

Rajeev

Sat Sep 6 2014, 05:02:55

(no subject) (by Rajeev)

Dear MGP Sir,

Thanks once again for great help.

I have checked program successfully with pic16f887, serial LCD controller, LCD 20x4, with 5 Buttons.

I have made changes few things as per my taste like cycle time to .2 ms, created new rung for new internal relay and set of timers no/off to set mode and running mode for perfection. LCD Display looking really perfect.

I have searched Google but could not found enough.

Can you explain little more about UART only, like how Time is coming on LCD in first line and why its repeating.

If possible Please explain more about advance level of UART.

Thanks & best regards,

Rajeev

Sun Sep 7 2014, 14:56:08

(no subject) (by MGP)

If you have a lcd then look in the manual for cursor movements.
In this example you can see \r\n this means "return" and "newline" as explaned in ldmicro's "helpfile" -> press F1 in the program (see the jpg file attached)

You must search for the command "home".
I don't have the manual of your lcd display, I cannot help you.

Sun Sep 7 2014, 15:23:49, download attachment ldmicro_serial_commands.jpg

(no subject) (by Rajeev)

Dear MGP Sir,

Now everything is clear to me what is all about uart.

Now problem is that timer is working very well and storing variable data in memory with help of PERSISTENT. I think its storing in RAM not in EEprom that is reason when powers off than it shows 00 value not last stored value in Variable.

Please guide me any solution.

Can you please give me logic if I want to make count up timer instead of count down timer.

Thanks & regards,

Rajeev

Tue Sep 9 2014, 05:25:01

(no subject) (by MGP)

I added a rung (3).
That happens when you program without testing it in real.
Simulation does not always detect such errors.

And I am not your personal programmer :-)
A countup timer is for you, you can learn a lot from it.

Wed Sep 10 2014, 05:12:41

(no subject) (by MGP)

Sorry, I forgot the file.

Wed Sep 10 2014, 05:14:10, download attachment timerdown999_V2.ld

(no subject) (by Rajeev)

Thank you MGP Sir.

Thu Sep 11 2014, 05:20:02

(no subject) (by Rajeev)

Dear MGP Sir,

In version 2 even the Problem is same, not storing variable data in EEPROM.

When power goes off variable value is 00 not last saved value.

I can humbly request only if you could help.

Thanks & regards,

Rajeev

Thu Sep 11 2014, 05:46:53

(no subject) (by MGP)

If I have time I setup a demo board.
I do not know why it does not work, maybe the cycle time.
At 10mS you have a debounce effect, at 0.2mS you dont.

Thu Sep 11 2014, 10:13:40

(no subject) (by MGP)

You cannot use external eeprom.

Thu Sep 11 2014, 11:52:13

(no subject) (by MGP)

Now it works, I had to move rung 3 below the memo(persist) instruction and also set the memo(persist) instruction in a new rung.

It's probably how ldmicro reads the memory locations.

Thu Sep 11 2014, 15:48:55, download attachment timerdown999_V3.ld

(no subject) (by Rajeev)

Dear MGP Sir,

Yes yes yes, it is working very well now it is storing in EEPROM.

Now power goes off still variable value is last saved value.

I don't have words to say thank you for your help and support.

best regards,

Rajeev

Fri Sep 12 2014, 05:02:34

(no subject) (by Rajeev)

Dear MGP Sir,

I am in trouble again, actually I want to make 5 timers in sequence with the help of your given program and I made all changes but my pic16f887 goes out of memory.

Please guide me or give any solution for this problem, what should I do.

Can I use I2C to add one more controller to add up memory?

Thanks & best regards,

Rajeev

Mon Sep 15 2014, 09:15:11

(no subject) (by MGP)

There is nothing you can do, only shorten your program.
Serial output uses a huges amount of memory.

I2C is not supported by ldmicro

Mon Sep 15 2014, 12:38:46

(no subject) (by MGP)

I have no experience with AVR's, maybe someone can try it if you post your program.
You have 2 types of memory, data and program memory and I dont know what memory you have shortage.

Tue Sep 16 2014, 06:42:42

(no subject) (by Rajeev)

Dear MGP Sir,

It is shortage of program memory. When I go for compile than LDmicro Error comes and display that "Out of memory; simplify program or choose microcontroller with more memory."

Thanks & regards,

Rajeev

Tue Sep 16 2014, 09:07:27

MGP Sir need your help again (by Rajeev Rawal)

Dear MGP Sir,

Can you help me to convert that program with 4 Digit 7 Segment display instead of LCD.

Thanks & best regards,

Rajeev

Thu Aug 8 2019, 06:15:15, download attachment timerdown999_V3.ld

(no subject) (by MGP)

I posted long time ago a 4digit voltmeter, the only thing you must do is to merge the 2 programs.
Simply replace the 2 first rungs (analog reading) with the time variable (speed = time) after merging the two programs, not that difficult...
Good luck..

https://cq.cx/ladder-forum.pl?...;parent=5604&tt=1477936580

Thu Aug 8 2019, 07:18:00

MGP Sir Thanks a lot (by Rajeev Rawal)

Dear MGP Sir,

Thanks a lot.
I appreciate your reply.

Best regards,

Rajeev

Thu Aug 8 2019, 07:44:55

MGP Sir, Can I use i2c Medule (by Rajeev Rawal)

MGP Sir,

Can I use i2c medule, TM1637 4 Bits Digital Tube LED Display Module.

In Release 5.3.1.0 the i2c is ready to use.

I am asking because just two wires to connect and it is very easy to make hardware.

Thanks in advance.

Thu Aug 8 2019, 08:49:17, download attachment I2C.jpg

(no subject) (by MGP)

I dont use I2C.
I'm using this display if needed.

https://www.benl.ebay.be/itm/4...be-Display-Module/400441742568

Thu Aug 8 2019, 09:32:23

MGP Sir need your advice. (by Rajeev Rawal)

Dear MGP Sir,

Need your advice that I want to add two 4 Digit 7 Segment display in above count down timer ladder.

No.1: it will display programmable set point time.(like Thumb wheel BCD)

No.2: As usual display for count down time.

I would really appreciate if could spare some time to advice me in this regard.

Thanks & best regards,

Rajeev

Mon Aug 12 2019, 05:41:48

(no subject) (by MGP)

Rajeev, I am not going to write a program due to lack of time but am always willing to check programs.

The countdown timer above has a set-up/dwn and the number is stored in eeprom, which works better than thumbwheel switches.

4 thumb wheel switches occupy many IO ports.
In this link you can see how you I did it some time ago.

https://cq.cx/ladder-forum.pl?...;parent=2154&tt=1314803385

Mon Aug 12 2019, 06:57:44

Thanks MGP Sir. (by Rajeev Rawal)

Thanks MGP Sir for your reply.

Best regards,

Rajeev

Mon Aug 12 2019, 07:17:55

MGP Sir need your help again (by Rajeev Rawal)

Dear MGP Sir,

Please visit my given link

https://youtu.be/HZjaIBXKDzA

Why 7 segments not showing so clean in real Hardware.

I just modify Mr. Jonathan file from samples with name of 7seg-display-analog.

I tried every thing but failed, could not fix that error.

Even original file giving same error in real Hardware.

I tried to run your file in same Hardware but your given file of 4 Digit Volt Meter not running properly.

https://cq.cx/ladder-forum.pl?...;parent=5604&tt=1477936580

I would be grateful if you could help me.

Thanks in Advance,

Best regards,

Rajeev

Thu Aug 22 2019, 11:42:29, download attachment 7seg-display-analog_4digit_1023.ld

(no subject) (by MGP)

I'll look at it during the weekend.
Which 7-segment display do you have?

Fri Aug 23 2019, 02:15:05

MGP Sir Thanks a lot (by Rajeev Rawal)

MGP Sir,

Thanks a lot for reply.

I am using Common Cathode 7-Segment Display model is SP40561CR HILITE as Mr. Jonathan suggested on file.

Please find attached file of circuit.

Thanks & best regards,

Rajeev

Fri Aug 23 2019, 06:26:09, download attachment 7-seg_circuit.jpg

(no subject) (by MGP)

I found the time to test this program I made 4years ago and it works good.
The test were done with a 16F877a and 16F887 and both showed the same result.

And I also made a video
https://youtu.be/wFBa9bkIMZs

Attached the 16F887 version

BTW : you also have to pay attention when you enter the configbits.

Fri Aug 23 2019, 11:32:28, download attachment 4digit_voltmeter_CC-displays_887.ld

MGP Sir Thanks a lot once again (by Rajeev Rawal)

Dear MGP Sir,

WOW!

Hard to find words to say Thank you.

Now I understand how you set configuration bits 0x3FFF20C2.
Hex value 20C2 = Binary 10000011000010.

Now Its working perfectly like your video.

But you can improve more to last digit of 7 segments not showing perfectly, the transition is not 100% perfect.

I am using 10K pot but still not perfect.

If you could find some time please see this issue and guide me how I can add one more 4 Digit 7 Segments to this program for SET POINT of Temperature.

Thanks & best regards,

Rajeev

Fri Aug 23 2019, 14:53:52, download attachment config887.jpg

(no subject) (by MGP)

Change your 330 ohm resistors in 180 ohm because the diplays are multiplexed then you have a better view.

As I wrote earlier, programming is for you ;)

Fri Aug 23 2019, 18:09:07

MGP Sir Thanks (by Rajeev Rawal)

Dear MGP Sir,

I really appreciate your kindness.

You did great help.

Please check this circuit for Dual Display of 4 Digit 7-Segments.

Best Regards,

Rajeev

Sat Aug 24 2019, 03:24:01, download attachment voltmeter_dual_display.jpg

(no subject) (by MGP)

If you are using 8 digits for multyplexing then you must use the new 7segment instruction, it's much faster.
Otherwise you will get a very weak reading .

My old version is only good for max. 5 digits.

Sat Aug 24 2019, 06:38:19

(no subject) (by Rajeev Rawal)

Dear MGP Sir,

I just gone through new 7segment instruction, yes it is perfect but same time little complicated.

Do you have any Simple example.

Thanks

Sat Aug 24 2019, 11:59:10

(no subject) (by MGP)

I had some time today and here is your program for 2 x 4 digit 7seg display with the new 7seg. instructiona and thanks to Ihor examples.

All necessary comments are included.

I tested it and it works, if something goes wrong with yours you have made an error.

You don't have to ask for more programs that's up to you now.

Practice a lot and you'll learn ;)

Good luck.

Sun Aug 25 2019, 09:05:44, download attachment 2x 4digit_voltmeter_CC-display.ld

MGP Sir Thanks a lot. (by Rajeev Rawal)

Dear MGP Sir,

Thanks a lot once again.

God Bless you.

Sun Aug 25 2019, 10:39:47

MGP Sir please have a look (by Rajeev Rawal)

MGP Sir please have a look and tell me your view on it.

I could not understand the value added on PIECEWISE LINEAR TABLE.

Please give me link to understand deep PIECEWISE LINEAR TABLE if possible.

Thanks & best regards.

Tue Aug 27 2019, 13:51:53, download attachment LM35_SSD.rar

(no subject) (by Ziggy)

google piecewise linear function

Tue Aug 27 2019, 15:42:23

MGP Sir Thanks a lot once again (by Rajeev Rawal)

MGP Sir,

Thanks a lot once again for sharing.

I didn't know about that Samples_V2.

It helped me.

Best regards,

Rajeev

Wed Aug 28 2019, 15:05:48

(no subject) (by Rajeev Rawal)

Dear MGP Sir,

Yes I really understand how values added in PWL of my given program.

Because he doesn't want to use math instruction so he used PWL and just making any point (x0,y0) , (x1,y1) etc to get the value.

temperature in degree Celsius = 2 x ADC Value from AN0.

For Example when ADC = 2 then temperature = 1 Celsius.

Values will store in Variable "result" from there to W register than PORT B for display.

Please correct me if I am wrong.

Thanks & best regards,

Rajeev

Thu Aug 29 2019, 06:47:07, download attachment LM35_SSD.rar

(no subject) (by MGP)

Not true, the calculation of the degrees is ADC*500/1023.

At 100�C (99.7 exactly) you have an ADC input of 204 and because the lack of floating point calculations it's not precise enouch.
You need to add an opamp (4x) at the output so that 100�C = 816.

If you want to try with PWL .... attached your updated program.
PWL needs 2 points, start 2 (0�C) and end 204 (100�C)

0�C (x0,y0)0,2 and 100�C (x1,y1)204,100

Remember when testing, ADCin = 204 for 100�C and is very difficult to simulate

Thu Aug 29 2019, 11:45:33, download attachment LM35_PWL.ld

(no subject) (by Rajeev Rawal)

Thanks MGP Sir.

Fri Aug 30 2019, 08:53:08

MGP Sir I have Trouble again (by Rajeev Rawal)

Dear MGP Sir,

Your all files of 4Digit working very well on my Dev. Board but that your file with name of (2x 4digit_voltmeter_CC-display.ld) not running at all.

May be I needed some extra circuitry in real hardware.

If yes please share your circuit with me if possible.

Thanks in advance.

Best regards,

Rajeev

Mon Sep 2 2019, 09:06:27, download attachment 2x4digit_voltmeter_CC-display.ld

(no subject) (by MGP)

How do you made yours? maybe I can see what you did wrong.

I tested my circuit again, 10min ago and it works 100% sure.

It's like your circuit attached, only the 330ohm resistors are 100ohm.

Mon Sep 2 2019, 12:13:12, download attachment 7-seg_circuit (2).jpg

(no subject) (by Rajeev Rawal)

Dear MGP Sir,

Same circuit I am using and your program with name of (4digit_voltmeter_CC-displays_887.ld) working perfectly like your Video. I modified MCU pins as per (2x4digit_voltmeter_CC-display.ld) file and still working perfect.

But new 7segment instruction file not showing any display.

Do have any simple file with new 7segment instruction to just display any thing very simple like 0123.

Best regards,

Rajeev

Mon Sep 2 2019, 12:32:20

MGP Sir Thanks a lot once again (by Rajeev Rawal)

Dear MGP Sir,

Your reply was very valuable.

Actually I had only in hand was PIC16F887 so I changed MCU in LD file that is reason program was not working.

After Your reply I found PIC16F877A and now program is working perfect with it.

Can you tell me why the program not working with PIC16F887. All pins connections are same.

Thanks & Best regards,

Rajeev

Mon Sep 2 2019, 13:04:56

(no subject) (by MGP)

And also, the compiler need to know for which controller he needs to compile the LD file, they have different registers and memory.
Checking the type of controller is also the first thing you have to look at if you have a program, but I know 887 or 877 is not much different...

Tue Sep 3 2019, 04:21:56

MGP Sir please have a look (by Rajeev Rawal)

Dear MGP Sir,

I was trying to further programming with "Piecewice linear interpolation" for "K Type thermocouple". I found good calculations. Can you see this and help me to just making perfect "Piecewice linear interpolation" in LDMICRO. Please see attached files. I need only 0 c - 400 c.

Thanks in Advance if you could find some time.

Best regards,

Rajeev

Tue Sep 10 2019, 14:01:49, download attachment Thermocouple_K.c

MGP Sir please have a look (by Rajeev Rawal)

Dear MGP Sir,

This is last file please have a look.

Best Regards,

Rajeev

Tue Sep 10 2019, 16:33:17, download attachment KTYPE.rar

(no subject) (by MGP)

You need to calculate for the 8 points in the PWL table how many degrees correspond to the AD input (0-1023).
Why not 9 points 0-50-100-150-200-250-300-350-400..

The calculations in your example can not be done by LDmicro because of the 16bit limit in LDmicro.

Wed Sep 11 2019, 13:36:13

MGP Sir Thanks a lot (by Rajeev Rawal)

Dear MGP Sir,

Thanks a lot for your valuable reply.

Best regards,

Rajeev

Wed Sep 11 2019, 14:57:23

MGP Sir please check this LD File (by Rajeev Rawal)

Dear MGP Sir,

Please check this LD File.

I just tried to modify your two program into one and its working good.

Please help me how I can make this program to 0-400.9 Celsius I tried and gave so much time but could not get success.

I know you are not my personal programmer but its request if you could just explain in your reply how I can do it my self. Your piece of advice always help me.

Best regards,

Rajeev

Fri Sep 13 2019, 09:38:51, download attachment 4DIGIT_WITH_LM35_INTEG..ld

(no subject) (by MGP)

You become addicted to me, every hour you bump into another problem.

Here you have the solution to your problem.
Because I would not have too much work, I used the digit3 (thousands) for the tenths (1/10�C).

You can do 2 things, leave it like that and make digit3 the rightmost digit or adjust the program and use digit0 for the tenths.

Rung 8, 9, 10 calculate the digit (tenths) with the MOD instruction and in rung19 digit3 is replaced by that digit.

Sat Sep 14 2019, 03:16:14, download attachment 4DIGIT_WITH_LM35_dec_tenths.ld

MGP Sir Thanks a lot once again (by Rajeev Rawal)

Dear MGP Sir,

I really appreciate your good heart and unconditional help.

I also want to thanks Mr. IHOR Sir for his efforts.

Best regards,

Rajeev

Sat Sep 14 2019, 10:37:20

Book for Pic mcu (by Rajeev Rawal)

Dear MGP Sir,

Can you suggest me one of the your favorite book for Pic mcu which can help me to better understand LDMICRO in deep.

Please also suggest for CCS C Compiler, if possible.

Thanks & best regards,

Rajeev

Sun Sep 15 2019, 12:31:12

(no subject) (by MGP)

Sorry but I have no books and I also have no favorite book.

I read a lot on the internet and a lot of datasheets and other PDF's.

LDmicro is the only programming language I use, but I understand other programming languages such as C, Basic ...

But my experience makes everything easier and you get that with age, I am already 60+

:) :)

Sun Sep 15 2019, 13:47:57

(no subject) (by Rajeev Rawal)

Dear MGP Sir,

So I have to wait long 8 years more.. because I am just 52+

:) :) :) :)

Best regards,

Rajeev

Sun Sep 15 2019, 14:18:28

Dear MGP Sir (by Rajeev Rawal)

Dear MGP Sir,

Hope you and your family perfectly alright in time period of COVID-19.

May God give you and your family Health + Happiness + Holiness.

Best regards,

Rajeev Rawal.

Fri Apr 3 2020, 14:58:36