Great project , been playing with different interfaces to Seatalk . I am new to electronic circuits although am a software developer by trade.
I am most likely doing something wrong but the MC74HC07 chip works great for receive but TX isnt working . I hook up pin 1 and seeing the pull down signal ok on transmit (it's an esp32 so 3.5v rather than 5v ) but pin 2 always stays at 12v (isolated from other seatalk devices ) . It was a good exercise i'm learning to read datasheets. I thought the problem was the 3.3v signal but it seems it's the high voltate the other side. Seems the MC74HC07 max is VCC (5v in my case )? I think maybe there is a high voltage protection at play? I am going to try to source some of the ones you recomended originally as the datasheet for them says up to 30v .
Great project , been playing with different interfaces to Seatalk . I am new to electronic circuits although am a software developer by trade.
I am most likely doing something wrong but the MC74HC07 chip works great for receive but TX isnt working . I hook up pin 1 and seeing the pull down signal ok on transmit (it's an esp32 so 3.5v rather than 5v ) but pin 2 always stays at 12v (isolated from other seatalk devices ) . It was a good exercise i'm learning to read datasheets. I thought the problem was the 3.3v signal but it seems it's the high voltate the other side. Seems the MC74HC07 max is VCC (5v in my case )? I think maybe there is a high voltage protection at play? I am going to try to source some of the ones you recomended originally as the datasheet for them says up to 30v .
Thanks again for sharing !