PIC plus-5110 LCD-GPS-BMP280-HMC5983

jjw · Feb 2, 2018

Ok, you are right.
There was another table in the calculations page, where UT, UP where mixed.

camerart · Feb 2, 2018

jjw said:
Ok, you are right.
There was another table in the calculations page, where UT, UP where mixed.

Hi J,
Ok.

Do you have the Oshonsoft simulator?
I just ran your latest CALC through it:

For i = 0 To 2
adr = 0xf7 + i
'SPISend adr
'SPIReceive data
b(i) = data
Next i
[Produced i+1 adr=247, i+2 adr=248, i=3 adr=249]

For i = 0 To 2
adr = 0xfa + i
'SPISend adr
'SPIReceive data
b(i) = data
Next i
[Produced i+1 adr=250, i+2 adr=251, i+3 adr=252]

EDIT: When you edit your latest CALC will you change 't' to 'tp' please, for ease of reading. (for me anyway)

C.

camerart · Feb 2, 2018

Hi,
Trying to understand .HB .LB and .3B

Is this correct?

t_raw.LB = b(2) _________XXXXXXXX
t_raw.HB = b(1) XXXXXXXX_________
t_raw.3B = b(0) __________________XXXXXXXX_________
C.

jjw · Feb 2, 2018

camerart said:
Hi J,
Ok.

Do you have the Oshonsoft simulator?
I just ran your latest CALC through it:

For i = 0 To 2
adr = 0xf7 + i
'SPISend adr
'SPIReceive data
b(i) = data
Next i
[Produced i+1 adr=247, i+2 adr=248, i=3 adr=249]

For i = 0 To 2
adr = 0xfa + i
'SPISend adr
'SPIReceive data
b(i) = data
Next i
[Produced i+1 adr=250, i+2 adr=251, i+3 adr=252]

EDIT: When you edit your latest CALC will you change 't' to 'tp' please, for ease of reading. (for me anyway)

C.

I have the simulator, the values are ok.

camerart · Feb 2, 2018

jjw said:
I have the simulator, the values are ok.

Hi J,
Ok, if it's ok with you, I'll change your latest CALC '0xf7 0xfa' etc and start to combine it with a main program.
C.

jjw · Feb 2, 2018

camerart said:
Hi,
Trying to understand .HB .LB and .3B

Is this correct?

t_raw.LB = b(2) _________XXXXXXXX
t_raw.HB = b(1) XXXXXXXX_________
t_raw.3B = b(0) __________________XXXXXXXX_________
C.

The values from b() are correct, the picture not, if you mean the byte positions.
They are the bytes in a long integer ( 32 bit, 4 bytes )
Starting from the most significant byte ( left )
X.4B X.3B X.HB X,LB
X.4B not used here.

camerart · Feb 2, 2018

jjw said:
The values from b() are correct, the picture not, if you mean the byte positions.
They are the bytes in a long integer ( 32 bit, 4 bytes )
Starting from the most significant byte ( left )
X.4B X.3B X.HB X,LB
X.4B not used here.

Ok, Is this ok? I hope so, it looks more sensible.

t_raw.LB = b(2) _________________________XXXXXXXX
t_raw.HB = b(1) ________________XXXXXXXX_________
t_raw.3B = b(0) ________XXXXXXXX___________________
C.

jjw · Feb 2, 2018

camerart said:
Ok, Is this ok? I hope so, it looks more sensible.

t_raw.LB = b(2) _________________________XXXXXXXX
t_raw.HB = b(1) ________________XXXXXXXX_________
t_raw.3B = b(0) ________XXXXXXXX___________________
C.

It is ok, but the bits don't overlap

camerart · Feb 2, 2018

jjw said:
It is ok, but the bits don't overlap

Hi J,
Must be more careful with my bits
C

camerart · Feb 2, 2018

Hi,
Here's the latest program with CALC. Will someone check it please?
The TEMP looks like it's reading and shows TEMP= 512XXX.0 to 52XXXX.0 with finger heat.
PRES is all over the place.

There are lines with ?????????????????? that I doubt.
C.

jjw · Feb 2, 2018

Is the TEMP a raw or ADC_t value or the final t after calculation?
Can you display the adc_t and t.
t should be something like 22.34 in room temperature.
It is better forget the pressure until temperature measurement is ok and display now only temperature values.

camerart · Feb 2, 2018

jjw said:
Is the TEMP a raw or ADC_t value or the final t after calculation?
Can you display the adc_t and t.
t should be something like 22.34 in room temperature.
It is better forget the pressure until temperature measurement is ok and display now only temperature values.

Hi j,
TEMP is now showing 22.0 to 24.0 with finger heat
C.

camerart · Feb 2, 2018

Hi,
The TEMP is showing approx 2.5° higher than my none scientific thermometer.
The PRES is showing 154xxx.xx, but seems too influenced by the TEMP.
I tried it in a food container, and pressed on it to make the PRESS rise, but it didn't.
Here's the latest:

C.

jjw · Feb 2, 2018

I don't see any writes to Conf, Reset, Control addresses
0xF5, 0xE0, 0xF4 ?
You could strip extra unused variables and constants.
Would be easier to read.

camerart · Feb 3, 2018

jjw said:
I don't see any writes to Conf, Reset, Control addresses
0xF5, 0xE0, 0xF4 ?
You could strip extra unused variables and constants.
Would be easier to read.

Hi J,
Here's a shorter one.
Check my WRITE addresses are correct, HIGH BIT = 0 instead of the actual address.
I've removed some of the WAITs. Earlier it didn't seem to work without them, but now the results are the same, with this program.
C.

jjw · Feb 3, 2018

Could you check, that SPI is working correctly.

Add a byte variable ID ( device Id ) and get it by:
SPIsend 0xD0
SPIreceive ID

ID should be 0x58 ( 88 decimal )

camerart · Feb 3, 2018

jjw said:
Could you check, that SPI is working correctly.

Add a byte variable ID ( device Id ) and get it by:
SPIsend 0xD0
SPIreceive ID

ID should be 0x58 ( 88 decimal )

Hi J,
Check the 0xF4 0xF5 settings, as I haven't set them with much thought yet.
C.

camerart · Feb 3, 2018

Hi,

Previously, I chose to READ TEMP and PRESS in separate programs, to narrow down the errors. When I combined the CALC into one of these MAIN programs, I forgot to turn on the PRESS BITs in 0xF4.

Now I'm getting TEMP READings around 22.00° and PRESS READings, downstairs average '701' and upstairs '670' repeatedly.

I'll need to check all of the settings, again, then post the program.

Thanks J and all.
C.

ericgibbs · Feb 3, 2018

hi C.
Use the online Govt local weather station site to get your local Barometric pressures.
Today should around 980 to 1000mB
E

Edit: I read 1010mB over here.

camerart · Feb 4, 2018

ericgibbs said:
hi C.
Use the online Govt local weather station site to get your local Barometric pressures.
Today should around 980 to 1000mB
E

Edit: I read 1010mB over here.

Hi E,
That's handy for anyone who want to make a weather station. I haven't had chance to check any conversions, but the PRESS was reading 100896.xx yesterday, and today is 102711.xx

I don't actually need this though, as I will zero it on the ground, then use numbers above that as it's altitude. I'll work out how I will use it as I get readings, and get the feel for it.
C.

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