I've been fiddling with a 20x4 i2c LCD with daughterboard GY-LCD-V1 purchased from rcmodel369. The board comes default with the pcf8574T address lines pulled low via 10K smd resistors (address 0x20). There are solder pads on the edge of the daughterboard marked A2, A1, A0 that allow you to pull the …

20x4 i2c GY-LCD-V1 daughterboard pullups insufficient ?

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