One of the first things I like to do when creating a new project is to get the I/O working. This helps in debugging the code as I write it.
What about projects that do not have I/O? This device sneeks both input and output from your computer (terminal program) to the PIC using just one pin.
In order for this circuit to work, you need to set either DTR (pin 4) or RTS (pin 7) to positive voltage. Turning on CTS/RTS hardware handshaking usually does this.
All serial data from the computer is transfered to the PIC as TTL true data. TTL true data from the PIC is converted to rs-232 level and sent back to the computer. Additionally, the transmitted data from the computer is prevented from echoing directly back (CR4 above).
Here is some SAMPLE CODE at the PIC end that sends and receives on a single pin allong with the LAYOUT and PARTS PLACEMENT.
For more detail: Serial to PIC Interface using PIC Microcontroller
About The Author
Ibrar Ayyub
I am an experienced technical writer with a Master's degree in computer science from BZU Multan University. I have written for various industries, mainly home automation, and engineering. I have a clear and simple writing style and am skilled in using infographics and diagrams. I am a great researcher and is able to present information in a well-organized and logical manner.