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+--- Thread: i2c lcd_pcf8574 not working (/showthread.php?tid=8322)
i2c lcd_pcf8574 not working - simdollaro - 07-17-2025
i got this issue
[22:24:38][C][lcd_pcf8574:024]: PCF8574 LCD Display:
[22:24:38][C][lcd_pcf8574:024]: Columns: 20, Rows: 4
[22:24:38][C][lcd_pcf8574:028]: Address: 0x27
[22:24:38][C][lcd_pcf8574:029]: Update Interval: 0.5s
[22:24:38][E][lcd_pcf8574:031]: Communication failed
[22:24:38][E][component:088]: Component display is marked FAILED:
this my config
esp32:
board: esp32dev
framework:
type: esp-idf
...............
i2c:
sda: GPIO4
scl: GPIO16
id: i2c0
scan: true
#frequency: 100kHz
display:
- platform: lcd_pcf8574
dimensions: 20x4
i2c_id: i2c0
address: 0x27
update_interval: 500ms
lambda: |-
it.strftime(0,0, " %d-%m-%Y %H:%M", id(sntp_time).now());
it.printf(0,1, "T Est %.1f-T Int %.1f", id(tt_ext).state, id(tt_int).state);
it.printf(0,2, "GIARD %s SCALE %s", id(giardino).state ? "ON" : "OFF" , id(scale).state ? "ON" : "OFF");
it.printf(0,3, "GIARD %.0f SCALE %.0f", id(giardino_work_time).state, id(scale_work_time).state);
--------------
what's wrong?
I already changed more displays , try invert sda/scl, try 3.3v and 5v also...
RE: i2c lcd_pcf8574 not working - simdollaro - 07-18-2025
found firts problem, the right address is 0x3F... the error now is resolved but in the screen don't see any chars...
have you tested the same hardware before?
regards
found firts problem, the right address is 0x3F... the error now is resolved but in the screen don't see any chars...
have you tested the same hardware before? have to introduce some resistor in the i2c bus?
regards
RE: i2c lcd_pcf8574 not working - simdollaro - 07-18-2025
everythinghs ok now.. sorry for this posts... changed contrast trimmer and all is ok. gread KC868-A2 I love you
RE: i2c lcd_pcf8574 not working - admin - 07-18-2025
ok, good.