Can you use two DS1302 with a Basic Stamp ----->>>> Solved

sam_sam_sam

Hi Every One

If this can be done how would you

I would like to use Elapsed Timer on one DS1302

I would·like to use DS1302_Counter timer on·other ·

Can any pins be shared

(one)·· How would you·hook up the two DS1302

(two)·· How would set up the time keeping part of the routine too switch from elapsed timer to regular timer

The regular (counter timer)·timer would be the one in the back ground this would keep track of the total amount of elapsed
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Sam

Post Edited (sam_sam_sam) : 12/6/2008 2:16:47 PM GMT

Capdiamont

I'm unclear why you want to use two ds1302 chips. DS1302 is a time keeping chip. What I would do is use the extra 7 bytes in the chip to store the start time, then calculate the difference between the stored time and the current time read from the chip.

sam_sam_sam

I'm unclear why you want to use two ds1302 chips. DS1302 is a time keeping chip

Thank You for your reply

I need to run one time chip all the time and stop and start the other time chip

For something·I working on the·Elapsed Timer routine that·I wrote a few month ago·now·I want to·also have a running timer that keep track of total Elapsed Time

Here is the link to this Project

http://forums.parallax.com/showthread.php?p=737892

What I would do is use the extra 7 bytes in the chip to store the start time, then calculate the difference between the stored time and the current time read from the chip

Could you give an example of how to do this

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·Thanks for any··that you may have and all of your time finding them

Sam

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Sam

Post Edited (sam_sam_sam) : 10/19/2008 12:10:21 PM GMT

Capdiamont

How long of time are you measuring?

Looks like your application is to measure your on time for your HVAC unit over X amount of time. Also looks like your using a BS2.

Maybe we are thinking too complicated. Do you really need the DS1302? Do you have power outages? If not power outages and not needing a highly accurate time base, you can do everything in the stamps RAM. Just remember one thing, there is tons of ways to do things.

the following is not code that will work, just a thought process.
Startup:
Make all ram values = 0, also all bytes, gives you up to 255 on each
I figure only 8 bytes are being used, and can add another 4 bytes for when your water sprayer is on. +-)



Main: 'for when not on, only update total elapsed time
If Pump is On gosub onmode 'start measuring on time
PAUSE 1000 ' wait 1 second
gosub AddTotal 'add to total time
gosub UpdateDisplay 'refresh display
Goto Main

AddTotal: '
TSec=TSec + 1 'add one to total on seconds
IF TSec>=60 Then 'if seconds is equal to or over 60 add one to minute, and reset seconds
TMin=TMin+1
TSec=0
ENDIF
IF Tmin>=60 Then
THour=THour+1
Tmin=0
ENDIF
IF THour>=24 Then
TDay=TDay+1 'note if allowed to run over 255 days it will get reset to 0, or error out. Can make this a word type variable for over 60k days.
THour=0
ENDIF
RETURN

OnMode:
Do until Pump = 0 'keep looping until pump is turned off
Pause 1000 'wait one second
OSec=OSec + 1 'add one to "on" seconds
IF OSec>=60 Then 'if seconds is equal to or over 60 add one to minute, and reset seconds
OMin=OMin+1
OSec=0
ENDIF
IF OMin>=60 Then
OHour=OHour+1
OMin=0
ENDIF
IF THour>=24 Then
ODay=ODay+1 'note if allowed to run over 255 days it will get reset to 0, or error out. Can make this a word type variable for over 60k days.
OHour=0
ENDIF
gosub AddTotal 'add to total time
gosub UpdateDisplay 'refresh display
Loop
Return

UpdateDisplay:
Add code here to scroll through info needed.
Return

sam_sam_sam

Capdiamont

Thank You for your reply

A few thing

(One)·I will not be controling any thing except for·the DS1302 with the Basic Stamp
(Two) I am needing· a highly accurate Time Base

With the elapsed timer routine that·I wrote it work very well

What the problem is that I need to keep track of how long the timer has been running·from the last time it was start to next time i want to reset the timer


Here is what I want to

ONE
·Keep track of running time of AC unit when compresor is running
Two
·How many restarts there are

These two I have already done· I need to do the last one and get it to work if there is a way to to do this

Three
How many Months, Day, Hours and Minutes have Elapsed Time has gone by when the timer was start

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Sam

Chris Savage

I have only had one project that used two DS1302 chips. I don’t have it together right now because it was a concept (built on the PDB). However the basic idea is that you could have 10 of these if you wanted. As I covered in my Binary Digital Clock project, I demonstrated that you can connect multiple SPI devices using the same clock and data pins and simply adding one chip select pin per package. The DS1302 was used in that project with a DS1620, three 74HC595 and a MAX7219. All of these chips use an SPI interface and all had common clock and data lines. I would check it out. It is posted in the sticky thread in the Completed Projects Forum.

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Chris Savage
Parallax Engineering

sam_sam_sam

Do you have to use a different routine for each DS1302 Chip
The reason I am asking is I want to display both DS1302 Chips Time on an LCD Display

Also do you have to use different "VAR" "CON" and also SUB Rountine for each DS1302 Chip


RTC_Out:
· HIGH CS1302··························
· SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]reg, ioByte]
· LOW CS1302···························
· RETURN

RTC_In:
· HIGH CS1302··························
· SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]reg]
· SHIFTIN DataIO, Clock, LSBPRE, [noparse][[/noparse]ioByte]
· LOW CS1302···························
· RETURN

Set_Time:······························
· HIGH CS1302··························
· SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]WrBurst]
· SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]secs, mins, hrs, date, month, day, year, 0]
· LOW CS1302···························
· RETURN

Get_Time:······························
· HIGH CS1302···························
· SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]RdBurst]
· SHIFTIN DataIO, Clock, LSBPRE, [noparse][[/noparse]secs, mins, hrs, date, month, day, year]
· LOW CS1302····························
· RETURN



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Sam

Post Edited (sam_sam_sam) : 11/28/2008 2:23:43 PM GMT

Bruce Bates

Sam -

I'm not all that familiar with the DS1302, but you would need to have a SELECT or ENABLE line in order to address each chip separately. Otherwise you will have contention on the DATA and CLOCK lines.

Regards,

Bruce Bates

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When all else fails, try inserting a new battery.

sam_sam_sam

Chris

Thank You for your reply but

The reason I am asking is I want to display both DS1302 Chips Times on an LCD Display at the same
I know that the stamp can only one thing at a time

I have to ask a·question·and it this

As I have below in a post where I ask about·do you have to have different·VAR and CON and SUB Routine for each DS1302 Chip

RTC_Out:
RTC_Out1:·········· and so on for each routine

All of these chips use an SPI interface and all had common clock and data lines.

I understand the part about·sharing the Clock and Data Line


Bruce Bates

Thank You for your reply

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Sam

Post Edited (sam_sam_sam) : 11/29/2008 2:20:45 PM GMT

sam_sam_sam

Look at the Attachment below this what i have so far

Can one tell me if I am on the right track or not

I am working on a dual DS1302 Chip board today so i can not try it now to see if it will work

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Sam

Bruce Bates

sam -

Unless I've overlooked something, you need a second set of variables for the elapsed time timer. Take a look:

Get_Time: ' DS1302 Burst Read
HIGH Timer ' Select DS1302
SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]RdBurst]
SHIFTIN DataIO, Clock, LSBPRE, [noparse][[/noparse]secs, mins, hrs, date, month, day, year] <==
LOW Timer ' Deselect DS1302
PAUSE 100
HIGH ElapsTimer ' Select DS1302
SHIFTOUT DataIO, Clock, LSBFIRST, [noparse][[/noparse]RdBurst]
SHIFTIN DataIO, Clock, LSBPRE, [noparse][[/noparse]secs, mins, hrs, date, month, day, year] <==
LOW ElapsTimer
RETURN

The second fetch of information will clobber the first, presuming you wanted to keep the elapsed time data separate from the regular timer data.

Regards,

Bruce Bates

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When all else fails, try inserting a new battery.

sam_sam_sam

Bruce Bates

Thank You for point this out to me

The second fetch of information will clobber the first, presuming you wanted to keep the elapsed time data separate from the regular timer data.

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Sam

kelvin james

You could use the same variables, but they would have to be zeroed after each read / lcd display of the selected timer. Not fully understanding the concept of the total operation, if there is time data you need to keep for reference, you could just write the data to eeprom, and go back and check it when needed, it will always be there.

Chris Savage

If you're doing nothing but displayed the values to an LCD you can use the same variables. You fetch and display then fetch and display again, rinse and repeat. Now, if you actually need to compare any of the information then you will need a whole new set of variable to handle this. Take care.

P.S. - As a note...the project I mentioned that had two DS1302 chips was because I wanted one to have the time, and use the other as a counter. Later I consolidated the project by simply incrementing or decrementing a counter variable whenever the seconds changed. It only required two variables and got rid of the second DS1302.

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Chris Savage
Parallax Engineering

sam_sam_sam

Chris

Thank You for your reply

This is just what·I want to do·what you have here

·Now, if you actually need to compare any of the information then you will need a whole new set of variable to handle this. Take care.

Can you share the code for this

I wanted one to have the time, and use the other as a counter. Later I consolidated the project by simply incrementing or decrementing a counter variable whenever the seconds changed. It only required two variables and got rid of the second DS1302.





I want one timer to run all the time and the other timer to run when the equipment is running

Here is· what·I came up with in the Attachement below

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Sam

Chris Savage

Sam,

When I needed a separate counter from the time I just used the program loop to increment (or decrement) the counter variable each time the seconds changed. For example, say you have the DS1302 set and running with the current time. Whatever it is doing its seconds are always updating. So now you need to run a timer…maybe it needs to count up until an event happens. So here’s some pseudo-code…

[color=#000000]Count_Loop:[/color]
[color=#000000]   GOSUB Check_Event   ‘Here’s where you’d look for whatever stops the counting.[/color]
[color=#000000]   IF event THEN GOTO Target_Label ‘your event happened, so stop counting[/color]
[color=#000000]   GOSUB Get_Time[/color]
[color=#000000]   IF seconds = oldSeconds THEN Count_Loop[/color]
[color=#000000]   oldSeconds = seconds   ‘reset compare[/color]
[color=#000000]   counter = counter + 1    ‘This might be a word variable holding the count.[/color]
[color=#000000]   GOSUB Display_Count ‘ Maybe you’re displaying the counter on an LCD?[/color]
[color=#000000]   GOTO Count_Loop[/color]

Of course, you will want to reset the counter on entry and there are several other little details missing, such as the specifics of each subroutine.· But this all depends on the application.

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Chris Savage
Parallax Engineering

sam_sam_sam

Chris

Thanks for the··pseudo-code…· very help full

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Sam