I am going to connect the Wizfi250 board to an MCU PIC 18F877A.
1 . Are the UART pins of Wizfi250 5v or 3.3v compatible? Can I connect directly the MCU to the Wzfi250 or should I have resistors as well?
2 . What about the CTS and RTS pins on the wizfi250? Should I leave them unconnected or short them?
3 . If I send data from UART or SPI what would be the form? String of data ( IN THE FORM OF “AT”) ?
These are my answer.
1 . Are the UART pins of Wizfi250 5v or 3.3v compatible? Can I connect directly the MCU to the Wzfi250 or should I have resistors as well?
2 . What about the CTS and RTS pins on the wizfi250? Should I leave them unconnected or short them?
3 . If I send data from UART or SPI what would be the form? String of data ( IN THE FORM OF “AT”) ?
I appreciate your response.
1 . Instead of using a Voltage-Level Translator as you said can I just use resistors to do that?
2 . Can I first configure wizfi250 as TCP server/AP from the web page configuration and then transfer data with peer system?
If yes what would be the command sequence? Is this the command mode?
For example:
1.Go to S2W setting on the wizfi250 browser- configure it as TCP server
2.send from MCU through UART the command AT+SSEND
3.Receive OK from wizfi250.
Or I should use the following commands:
1.AT+SCON
2.AT+SMGMT
3.AT+SSEND
4.AT+SFORM with that specific order?
This setup will not work. You have to switch both resistors, the 1k needs to be connected to +5V and the 2k resistor needs to be connected to GND. The corresponding equation for calculating the voltage divider does normally not show the output voltage but the voltage that drops over the appropriate resistor.