I am slowly getting back to AVR's and my SPO2 Oximeter is well on its way.
I am reading the values using ADC0 and the internal voltage ref using the Debug
in Atmel Studio and DebugWire Breakpoints with Actions (very slow)
So I am attempting to relearn serial communications
I bought the PL2303tausb that has 4 wires
Using putty (I could not get putty to work for some reason) so I used MicroRidge ComTestSerial
and connected an LED on the RXD line and when I send a character it blinks
When I ground the TXD it receives garbage as expected all is well.
Connecting to AVR is my question:
I assume I tie the ground wire to the AVR board, I am using 5VDC for the breadboard.
Just wondering about the USB Positive wire, just leave it disconnected?
Also the connections to the transmit and receive, Direct connect or use resistors?
I have not yet connected up my 14.7xx crystal or programmed the USART (although I did buy CodeVisionAVR full version so I will be getting to
TFT/OLED stuff later.
I am ordering a new Hantek DSO5202P 200MHz so I can understand the signals I'm working with.
I will be using C# to program the software that displays the collected data.