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Worked for me without any issue....

https://youtu.be/X7eT1KRQwkA

https://libstock.mikroe.com/projects/view/4878/qm5883-digital-compass-demo

Example Code

#include <16F87.h>

#device *= 16

#fuses INTRC_IO, PROTECT, NOWDT, BROWNOUT, NOWRT
#fuses NODEBUG, NOIESO, PUT, NOMCLR, FCMEN, CPD

#use delay ...

font.c

static const unsigned char font[96][5] =
{
{0x00, 0x00, 0x00, 0x00, 0x00} // 20
,{0x00, 0x00, 0x5F, 0x00, 0x00} // 21 !
,{0x0 ...

Yeah I think you can use multiple DHT sensors using a analog MUX like 4051....

It won't work in simulation....

You are getting 255 instead of 25.5 because in my MikroC example I avoided floating point math and instead used integral math to conserve RAM....

What about the humidity data? Is it also negative?

It could be due to wrong variable type.... You need to be careful with pointers too....

Did you get any error message? What do you mean by "doesn't work well"?

I used the same code as here but in a AT89S51. Please check the example here:

http://libstock.mikroe.com/projects/view/1331/am2320-relative-humidity-and-temperature-sensor-demo

Check out the dem ...

Thanks for the tip.... Very Happy

This is a simple calculator made with 7 segment display and a 4x4 keypad. Currently only integral calculations are supported.

keypad.h

#define col1 pin_A1
#define col2 pin_A2
#define col ...

Don't depend on Proteus sim as it sometimes fail terribly.... Test it in real life.... Here's my test video:
https://www.youtube.com/watch?v=uYR1GkMOCGw

By the way where did you get the model for ...

PCF8574.h

#define PCF8574_address 0x40

#define PCF8574_write_cmd PCF8574_address
#define PCF8574_read_cmd (PCF8574_address + 1)

#define SDA_pin pin_A5
#define SCL_p ...