Hello, The I2C pins are broken out, but are not implemented in any way. There is no plan on my side to add the I2C to the functionality, since I stopped working on it. It should be technically feasible, to at least print over I2C, but I do not know the max data rates that you could get. There might be challenges in that the HP45 needs to be an I2C slave device, so it needs to respond when the master device wants a response, which might collide with some of the inkjet functions, but overall I don't see insurmountable issues.
I'd love to give you better news, but this is sadly it.
Standalone controller V4.0
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dragonator
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