Out of interest, what is the reason for trying bit bang serial before I2C slave - is it just speed?I'd try bit bang serial before trying slave I2C. If the slaves generate the data automatically you would just need one GPIO per slave at the master. Bit bang serial will probably be pretty solid up to 19.2Kbps.
1. Maybe. But you're going to have to do it yourself.
Yes, I think that is the way to go. I did look into PPP for this (that bought back memories from years back!). It would be quite nice as it would leave the option to replace serial with Ethernet at some later date if needed.2. Use a UART, connect TX to RX, RX to TX and you can easily communicate over that. You can even get TCP/IP running over PPP over a serial connection.
Thanks3. Use anything other than I2C.
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