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Forum Index : Microcontroller and PC projects : Newie got a few questions
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 10071 |
This isn't weird, if you don't have OPTION EXPLICIT then the Micromite will create automatically a variable the first time it is used. This is why it is so important to use it in big programs. For example without OPTION EXPLICIT myvariable = 1 ... ... ...other code ... newvariable=myvariabl*4 newvariable will be equal to 0. Basic has automatically created the variable "myvariabl" which was actually a typo. with OPTION EXPLICIT DIM INTEGER myvariable = 1 ... ... ...other code ... newvariable=myvariabl*4 gives the "variable not declared error" so you can easily see your problem. You will also see in my code I also use "OPTION DEFAULT NONE" This means that I have to declare each variable as a string, integer, or float. Again this seems like adding work, but by doing it you know that the variable will always have the correct type for the use you want. |
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lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Thanks matherp,that explains it nice and easily |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Back again - (sorry) How do I say this? IF hour = 02 and if min = 05 then 'sync clock code goes here end if |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6221 |
IF hour = 02 and min = 05 then
'sync clock code goes here end if You will also need some way to make sure that you only sync once per hour. Otherwise you may end up setting the time hundreds of times during the one minute window. How you do that will depend on the rest of your program flow. One way is: IF hour = 02 and min = 05 then
if lastsync <> hour then 'sync clock code goes here lastsync = hour end if end if It will only run the sync part once for each hour no matter how many times the routine is called. lastsync needs to be a global variable if you are using a SUB or FUNCTION Jim VK7JH MMedit |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Thanks TassyJim I didn't realise that you could actually use IF AND THEN statements |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
A useful bit of advice about IF....AND...OR..... THEN ... Try and get in the habit of using brackets to separate the test conditions to eliminate potentially difficult to find bugs. So it is 'useful' to do something like: IF (....) AND ( (....) OR (...) ) THEN NOTE: the brackets are not necessary in terms of logic providing you keep on top of things. However, I have been helping a few people recently where the lack of brackets was resulting in errors in the 'output'. WW |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Another option to Jim's method is to use the SETTICK command. The following will interrupt the main program hourly to do the syncing. Greg SETTICK 3600000,Syncsub
SUB Syncsub . . END SUB |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
I like the settick option, but I only want it to send the time once a day at 2:05AM Saves me writing code on the indoor unit to change the time when DST/BST comes and goes when the outdoor unit with the gps already does that. I might get it to only send the time on power up and then on the DST/BST change dates, not sure yet I'll decide later on when I start thinking about the indoor unit. |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
What is COM1: ENABLE ? |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2946 |
Hi Lew, The enable is for use with RS485 operation which `can' use an enable pin.. You can safely ignore this for your RS232 work. From memory it goes high when the TX wants to talk this goes to the enable pin on a RS485 driver chip. The main use is it is possible to have multiple `slaves' on the same daisy chained line and they all listen and when they have something to say they can enable the TX line of the RS485 driver to send information back to the Master.. ie. They can all listen 100% of the time but only one can talk at a time.. Usually this is controlled by a POLLed protocol, the MASTER asks address 1 do you have something to send and waits, if no response after a set time then the MASTER asks address 2 do you have.... Etc etc.. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
I'm stuck again I want to print this PRINT #2,Line2$,Line1$,wheading,wSpeed,wgust,hgust,mmrain,mmrain2,bme280_read_temp,bme280_read_pressure,hightemp,hightemp2,low temp,lowtemp2,bme280_read_humidity,UVindex,lux to COM1 which I have enabled and it's working but it will not print to the com port. [code] print " Direction: ";STR$(wheading,3,2);" Degrees" print " WindSpeed: ";STR$(wSpeed,3,2); " MPH" print " Gust ";STR$(wgust,3,2); " MPH" print " Highest Gust ";STR$(hgust,3,2); " MPH" print " Rain Today ";STR$(mmrain,3,2);" mm" print " Rain Yesterday";STR$(mmrain2,3,2);" mm" print " Temperature "; STR$(bme280_read_temp(),3,2)" C " print " Pressure "; STR$(bme280_read_pressure(),3,2)" mB " PRINT " Highest Temp ";STR$(hightemp) " C" PRINT " Hi Temp Yesterday ";STR$(hightemp2) " C" PRINT " Lowest Temp ";STR$(lowtemp) " C" PRINT " LOW Temp Yesterday ";STR$(lowtemp2) " C" PRINT " HUMIDITY "; bme280_read_humidity()"%" print " UV Index: ",STR$(UVindex,3,2) Print " Light ";STR$(lux,3,2);" LUX"[/code] Error: A sub/fun has the same name: BME280_READ_TEMP I've tried it with $ at the end of the name, I've tried it with brackets around it, and with $and brackets, but I cannot figure out what it doesn't like IF I try and print Line2$,Line1$,wheading,wSpeed,wgust,hgust,mmrain,mmrain2 it works it fails when I put the rest of the line in EDIT: I even tried this and it failed [code]PRINT #2, STR$(bme280_read_pressure),STR$(bme280_read_temp),STR$(bme280_read_humidity)[/code] Error: A sub/fun has the same name: BME280_READ_PRESSURE I don't get why it fails when it will print to the console quite happily EDIT 2: I got it working by making 3 new "names" (variables?) called temp, humidity and pressure then did pressure = bme280_read_pressure, temp = bme280_read_temp and humidity = bme280_read_humidity Then PRINT #2, temp, pressure, humidity works I also found out I need to put a "," between them so I can sort them on the indoor unit I bet there is a much simpler and quicker way to do this, but I've no idea what it is |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Back again with another question, which to me is hard but to others is probably simple/ I know how to get a specific result from a ?string" an example is extracting the time from the $GPRMC a GPS Is there a way to IGNORE the WHOLE string IF a part of the result includes "not found" I want to do something, but ocassionally the result is the word "not found" instead of what I actually want. This can or could happen at any of the parts I want to extract. IF it was only in one position it "might" occur then I could obviously tell the MM to ignore it, but is there an "EASY" way to tell MM to ignore the whole string if any part of it contains the word "not found" ? |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
@lew247 Look at using the INSTR function. Something like: IF INSTR(GPS-In$,"not found")=0 THEN 'do your normal stuff here as GPS-In$ doesn't contain 'not found' ELSE 'invalid data so do whatever ENDIF Hope this gives you an idea for proceeding 
WW EDIT: You may need to be careful of case sensitivity with 'Not Found', 'NOT FOUND', 'not found' etc |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Thanks Phil, I had no idea there was an ISTR function, I was looking in the command list That's a great help, I should be able to do what I want now  |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Can anyone tell me WHY the voltage is being rounded up? The code[code]DIM integer Batt2 DIM INTEGER BATT3 DIM INTEGER BATT Batt2 = Pin(24) Batt3 = Batt2 * 2 batt = Batt3 temp = tempr(3) PRINT" Battery Voltage "; STR$(Pin(24)) PRINT " Battery Voltage ";STR$(batt);" V" PRINT" Battery Voltage "; STR$(batt2);" V" PRINT" Battery Voltage "; STR$(batt3);" V"[/code] The printout{quote] Battery Voltage 1.78065 Battery Voltage 4 V Battery Voltage 2 V Battery Voltage 4 V[/quote] |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Hi Lewis, An integer has no decimal places. So 1.78065 is rounded up to the integer value of 2. So Batt2 (integer) reads the pin and saves value of 2. Batt3 = 2 * 2 (=4) And hence Batt = Batt3 = 4 WW |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Sorry - forgot to mention; IF you change all three DIMs from INTEGER to FLOAT then you will get the decimal places. Then use STR$ with the optional parameters to display the number of decimal places required
WW |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Thanks WW |
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| lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Another question How can I do this? If LOC(#3)<>0 then LOOP If LOC(#2)<>0 then LOOP The way I understand it is - if location 3 is empty it loops therefore not checking location 2 I'd like the program to keep checking both com ports while carrying on with the program and if it finds anything then come out of the respective loop into a sub |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9493 |
Assuming you want to check #3 then #2, then you could do something like: [Code] Do If LOC(#3)<>0 then D$=INPUT$(LOC(#3),#3) 'Suck everything out of buffer so it is empty for next time ----- YOUR #3 code you want to happen if there is something in the buffer goes here ----- ENDIF If LOC(#2)<>0 then D$=INPUT$(LOC(#2),#2) ----- YOUR #2 code you want to happen if there is something in the buffer goes here ----- ENDIF LOOP That will go around in circles checking each COM port buffer, and then doing whatever needs to be done within the main DO/LOOP as it detects each one. Provided the com port buffers are not time critical, it will deal with the data from handle #3 first, then handle #2 next. This should do what you want, but I might have misunderstood how you want the code to flow....... Smoke makes things work. When the smoke gets out, it stops! |
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