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  1. - 24th May 2018, 16:43 #7
    queenidog's Avatar
    queenidog
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    Default Re: more i2c and mcp23017

    I put a label at the end of my i2C write statement to flash an LED if there is no acknowledge from the chip.

    there is NO acknowledge...the LED is flashing. So that's a result I will work with. I have extra port expanders (all pretested) and 16F887s.

    Update:
    Changed out port expanders: no change
    Changed out 16F887: no change
    Changed SDA and SCL port from PortC.4 and PortC.3 to PortA.5 and PortA.4: works. Acknowledge led is OFF>

    Any insight into why PortC didn't work but PortA does? ON the LabX1, C.4 and C.3 are designated for I2C.
    Last edited by queenidog; - 24th May 2018 at 17:01.
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