MicroPython Forum (Archive)

jimmo wrote: ↑

Tue Apr 14, 2020 5:57 am

derkomai wrote: ↑

Sat Apr 11, 2020 11:55 am

- Send i2c command GET_KEY_VALUE (0x04)

derkomai wrote: ↑

Sat Apr 11, 2020 11:55 am

i2c.writeto(49, b'4') # returns 1, so I get 1 ACK, correct.

These two are not the same thing.

b'4' is 0x34 (i.e. the ascii code for the '4' character). You want to use b'\x04'

Yes, hat was it, thak you for your help!

jimmo wrote: ↑

Tue Apr 14, 2020 5:57 am

derkomai wrote: ↑

Sat Apr 11, 2020 11:55 am

- Send i2c command GET_KEY_VALUE (0x04)

derkomai wrote: ↑

Sat Apr 11, 2020 11:55 am

i2c.writeto(49, b'4') # returns 1, so I get 1 ACK, correct.

These two are not the same thing.

b'4' is 0x34 (i.e. the ascii code for the '4' character). You want to use b'\x04'

Oh, thanks! I'll give it a try later.

from machine import Pin, I2C i2c = I2C(scl=Pin(5), sda=Pin(4), freq=400000) print(i2c.scan()) # returns [49, 60] as expected i2c.writeto(49, b'4') # returns 1, so I get 1 ACK, correct. i2c.readfrom(49, 1) # returns \x02, or \x02\xff\xff\xff\xff\xff\xff\xff if I read more bytes This is the code I'm ...

Hi everyone. I'm new over here and I'm fiddling with a Lolin D32 mini and the following 0.66" OLED screen with 2 x I2C buttons: https://docs.wemos.cc/en/latest/d1_mini_shiled/oled_0_66.html After a few hours trying to make the two buttons work and looking for some docs, I'm starting to think that ma...