i just checked my arduino inventory and I have a handful of bidirectional logic level converters. Maybe I should try one of those I know they are quite genius using a smart layout of mosfets.
I assume that the raymarine nmea doesn’t need power and it’s all just a question of wirering the 5V side of the logic converter to nmea and the 3.3V side to rxd and txd of my esp32 or RPI depending on the setup - simple as that.
Br, Peter
Ok, so TX goes to NMEA+ then (with the logic level converter in-between)
I assume that the raymarine nmea doesn’t need power and it’s all just a question of wirering the 5V side of the logic converter to nmea and the 3.3V side to rxd and txd of my esp32 or RPI depending on the setup - simple as that.
Br, Peter
(2020-11-26, 09:08 PM)ironman Wrote:(2020-11-26, 08:02 PM)Peter— Wrote: So the difference between pulling wires from the rs232 Tx and rx pins vs using the gpio rxd and txd pins is 3.3v vs 5v... lame
Not that lame, in fact:So you could say it's inverted.
- RS232 '1' is negative voltage, TTL '1' is positive.
- RS232 '0' is positive voltage, TTL '0' is zero volt.
Ok, so TX goes to NMEA+ then (with the logic level converter in-between)