LCD backlight

[Valenttt]

Hi, I can’t implement the scheme for automatically turning off the backlight of the LCD display via sys.lcdout ("30").

.

In the file pattern.csv, GPIO22 cleaned and applied it for highlighting.

P_I2S_DATA, data, u8,255 P_BACKLIGHT, data, u8,22

then made pattern.bin, flashed to the address 0x3a2000. After the overload, the backlight turned on, but after 30 seconds. does not turn off.

Tell me what I'm doing wrong?

[pilnikov]

Try this schematic diagram 102R = 1KOhm 103R = 10kOhm Q1 - any n- channel mosfet, e.g. 2N7002

[pilnikov]

в исходной схеме неверно включен полевик - он всегда открыт через паразитный диод, который есть физически, но на схеме не указан.