As per this post here, the tiny-core has a softserial (write only) capability.My development laptop, has no serial port, but I do have a PL2303 based USB-Serial converter (like this one on ebay). Can I use it to interface with my "ATtiny on breadboard" ? On the breadboard, do I need additional circuitry (level-changing), to enable serial communication ?
Yes, you will need something like a MAX232 on the breadboard or some other circuitry to adapt the signal. You not only need voltage level conversion, but also to invert the polarity.
Quote from: falcon74 on May 14, 2013, 05:46 pmWould I still have to worry about polarity inversion ?No. RS232 doesn't do inversion, I don't know where anybody got that idea.
Would I still have to worry about polarity inversion ?
I don't know where you get that idea from, but please check this link:https://www.sparkfun.com/tutorials/215The RS232 voltage level signal IS inverted from the TTL level version.
Thanks folks. So it is indeed multimeter time. Will try out the voltage levels of the connector I have. If they are 5VDC, then I believe, I should be good to go.
@fungus, are you suggesting that I hook-up the TTL-level Tx pin, to the dongle/converter's RS-232 level Rx pin, and "try it out" ? Nothing bad can happen, because Rx-end can, in worst case expect higher voltage signals (and perhaps, also inversion). At worst, this thing won't work, but usually no fear of magic-smoke! Right ? Or, I didn't understand your last statement.