BMP280 humidity doesn't work

[Ttelmah]

No, I mean the bme280.c driver.

[pekka1234]

Ok I have to try it. I will inform here.

I have thinking before that I have BMP280 device.
Thanks much.

[Ttelmah]

Set up your chip like:

[Ttelmah]

Let's also make some comments, and you will see why I am complaining
about the code:

[pekka1234]

Ttelmah,
thank you for commenting my code.
It will send the results only with 10 seconds, so it is not important to me.
==
I try the CCS own library BME280.c
The first time I got some results, but then when I tried again 2-20 timea I got only 0s.
I didn't edit the library.
Here are my results:
The First try
Probyte BME280 sender,LDR,NTC 11-Sep-23
#TT15+25.15,+55.27,084,464384.18,793608.94$
00.84$
#TT15+25.14,+52.87,084,464384.18,793608.94$
00.84$
#TT15+25.06,+50.47,084,464384.18,793608.94$
00.84$
====
The second anf more resulta.
Probyte BME280 sender,LDR,NTC 11-Sep-23

bme280=0
sensor mode=0
Vesion check =0
Temp right=0
Press right=0
Hum right=0
#TT15+25.46,+57.67,084,380498.10,793608.81$
========
And here are the my main code:

// define device I2C address: 0xEC or 0xEE (0xEE is library default address)
//#define BME280_I2C_ADDRESS 0xEC

#include <18F2620.h>
#DEVICE ADC=10
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES PUT //Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT //Program memory not write protected
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOMCLR //Master Clear pin not enabled
#FUSES NOWRT
#use delay(internal = 8MHz)
#use rs232(baud=9600, parity=N, UART1, errors, bits=8, BRGH1OK) // RS232 settings
#use I2C(MASTER, I2C1, FAST = 400000)

#define LEDON output_high(PIN_C5); //punainen LED
#include "BMe280.c"
#include "ntc.c"


//signed int32 temperature;
signed int32 pTemp;
unsigned int32 pPress;
unsigned int32 pHum;
// measure ntc temp
void mittaa ( void)
{
unsigned int8 i=0 ;
restart_wdt(); // sample watcdog, if needed
temp=0;

for(i=0; i<multiplier; i++) //measure ntc 20 times and cound mean value
{
mittaa_ntc(); // measure NTC
steinhart1(); // count staninhArt
temp +=steinhart; // add to temp
}
temp = temp/multiplier ; // acalibrate if needed


}

unsigned int16 temp1 ;

void main()
{
int8 i, ok;
LEDON ;
delay_ms(100); // wait 0.1 second
printf("\rProbyte BME280 sender,LDR,NTC %s\r", __DATE__ );
ok = bme280_ok();
printf("\rbme280=%d", ok);

ok= bme280_set_mode(BM280_MODE_FORCED) ;
printf("\rsensor mode=%d", ok);
if( _bme280_version_check())
printf("\rVesion check =1");
else
printf("\rVesion check =0");


while(TRUE)
{
temp1=0;
for( i=0;i<10;i++) {
bme280_get_temperature(&pTemp);
temp1 += pTemp;
}
pTemp = temp1/10 ;

ok= bme280_get_temperature( & pTemp);
printf("\rTemp right=%d", ok);
ok= bme280_get_pressure(&pTemp,&pPress);
printf("\rPress right=%d", ok);
bme280_get_humidity(&pTemp, &pPress, &pHum);
printf("\rHum right=%d\r", ok);

// ptemp -= 240; //calibrate -2.c
mittaa(); // measure with NTC temp
measureLight(); // measure light
printf("#TT15"); // # starts the sentence
// temp =-temp; testing
if ( temp>0) // NTC temp
printf("+%05.2f,", temp);
else
printf("%05.2f,", temp);
temp -= 1.94; // calibrate

// ptemp= pTemp/100;
if(pTemp < 0)
{
pTemp = abs(pTemp); // abs: absolute value

printf("-%02Lu.%02Lu,", pTemp/ 100,pTemp% 100);
}
else {


printf("+%02Lu.%02Lu,", pTemp/100, pTemp % 100);

}
printf( "%03ld,", light ); //
// PPress =pPress/ 100;
printf( "%04Lu.%02Lu,", pPress/100, pPress % 100);
// pHum =pHum/100;
printf( "%02Lu.%02Lu$\r", pHum / 1024, ((pHum* 100)/1024) % 100);


delay_ms(10000); // wait 2 seconds
}

}
// end of code.¯

Why I got the first time some results?
And then nothing
Is my working sensor somehow wrong to CCS library?

Pekka

[Ttelmah]

As you post, the library will be ignoring your I2C setup, and clocking the
I2C at 1MHz. Unless your bus is very short this is unlikely to work.
You need to setup the I2C as I show.

[pekka1234]

Than you Ttelmah

I moved I2C switching speed to 10000.
But it doesn't help.
#use I2C(MASTER, I2C1, FAST = 10000)

I connected the SDO input to ground, but it doesn't help.
There were the BME280 initialize problem.
I can't find PConfig parameters from the library.
The function void bme280_prepare_defaults(bme280_init_t *pConfig) I can't use it because I do not know what is pConfig
==
Here is my results
Pekka Ritamaki

Probyte BME280 sender,LDR,NTC 12-Sep-23

bme280=0
sensor mode=0
Vesion check =0
pTemp 0, pPress=572785220, pHum =0
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
Temp right=0 pTemp 0
bme280_get_humidity()
NOT_INIT
Press right=0 pPress 572785220 pTemp 0
bme280_get_humidity()
NOT_INIT
Hum right=0 &pHum 0 pTemp 0 pPress 572785220
#TT15+25.36,+00.00,065,5727852.20,00.00$

pTemp 0, pPress=572785220, pHum =0
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
bme280_get_humidity()
NOT_INIT
Temp right=0 pTemp 0
bme280_get_humidity()
NOT_INIT
Press right=0 pPress 572785220 pTemp 0
bme280_get_humidity()
NOT_INIT
Hum right=0 &pHum 0 pTemp 0 pPress 572785220
#TT15+25.40,+00.00,084,5727852.20,00.00$

[Ttelmah]

You are missing the point.
The driver will not use your I2C setup.
You need either to use a named stream as I show, or get rid of your
#use I2C line and have:

[pekka1234]

Ttelmah
I corrected my I2C
And use only what has done in library for example

#include <18F2620.h>
#DEVICE ADC=10
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES PUT //Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT //Program memory not write protected
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOMCLR //Master Clear pin not enabled
#FUSES NOWRT
#use delay(internal = 8MHz)
#use rs232(baud=9600, parity=N, UART1, errors, bits=8, BRGH1OK) // RS232 settings
//#use I2C(MASTER, I2C1, FAST = 10000)

#define LEDON output_high(PIN_C5); //red LED
#include "BMe280.c"



signed int32 pTemp;
unsigned int32 pPress;
unsigned int32 pHum;
// measure ntc temp
void main()
{
int8 i ;
int1 ok;
bme280_init();
bme280_set_mode(BM280_MODE_NORMAL);
for(;;) {
ok= bme280_ok() ;
printf("\rVesion check %d", _bme280_version_check());

delay_ms(1000);
ok = bme280_get_humidity(&pTemp, &pPress, &pHum);
if (!ok)
printf("\r Error reading BME280 sensor!\r\n");
else
printf("\rTemp=%ld Press=%lu Hum=%lu\r\n", ptemp, pPress, pHum);
}

}
==
Here is the result
Vesion check 0
bme280_init
BM280_OS280_1x = 1
BM280_TIMING_12 = 2
bme280_prepare_defaults
bme280_init()
RET=0
Vesion check 0
bme280_get_humidity()
NOT_INIT
Error reading BME280 sensor!
==
I have closed SDO pin to ground.
Hmm, what is wrong?
==
Regards Pekka Ritamaki

[gaugeguy]

And you still have not added the line Ttelmah asked you to.

[pekka1234]

gaugeguy, I removed my I2C command, now it comes from library with speed 1000000
//#use I2C(MASTER, I2C1, FAST = 10000)

Here is the library code
#ifndef BME280_I2C_ADDRESS
#define BME280_I2C_ADDRESS 0xEC
#endif

#ifndef BME280_I2C_BAUD
//spec says max i2c clock is 3.4MHz, but I wasn't getting anywhere near that fast.
#define BME280_I2C_BAUD 1000000
#endif

Hopefully some can help
Pekka

[Ttelmah]

Your board, unless it has very short connections directly to the chip (it
doesn't, since you dhow a link to a module), will not run at 1MHz.
Hence you need to slow the clock down with the line I showed.

[pekka1234]

I tried to remove the shot from SDO to gnd, but it doesn't help
Pekka

[dyeatman]

You do realize that every time you change the SDO connection your are changing the device address..
with SDO tied to ground you need to be using address 0xEC,
with it cut (tied to 3.3) you need to use address 0xEE

Also, you still haven't fixed the speed like he told you to.
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[pekka1234]

OK , put it back, but it doesn't help
bme280_init
BM280_OS280_1x = 1
BM280_TIMING_12 = 2
bme280_prepare_defaults
bme280_init()
RET=0
Vesion check 0
bme280_get_humidity()
NOT_INIT

Pekka