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I think what was peculiar, was the decision when designing I2C, to put the
R/W bit at the bottom of the address field. It could have been put at the
top just as easily, and if so the addresses wou ...

One other critical thing. He needs to turn off slew rate control on the
I2C pins. By default this will be on. Needs:

set_slow_slew_C(FALSE);

To disable this on this port.

Thanks a lot, disab ...

hmm... 'found all addresses' sounds like no I2C pullup resistors, or the wrong value.
With a 3 volt PIC, the pullups should probably be 3K3 or 2K7, though that depends on speed of the interface, d ...

and....
running I2CSCANNER will SHOW you the address of the device when it finds it.

7 bit addressing has always struck me as odd (no pun), as you must either read or write to the device using 8 ...

Agree wholeheartedly with Jay on testing with the I2C_scanner.
However the big 'critical' one has already been pointed out by PCM. The
device has a 7bit I2C address of 0x44, so for a PIC 8bit I2C a ...

Your code has several mistakes. You need to do it like this:

#define SHT40_BASE_ADDR 0x88
#define SHT4X_CMD_MEASURE_HPM 0xFD

//================================
void main(void)
...

low level hardware comments...

'SHT40'....is a 3 volt device. I see 'LF',so the PIC IS a 3 volt ?

Assuming it's on a 'module', can you confirm, using the I2C scanner program in the code library, ...

hi,
Passing from HTS221 to SHT40 seems there is a problem in reading the sensor.
I've used the standard C reference instructions i2c_transfer_in e i2c_transfer_out but the sensor don't answer. I've ...