Pankaj21

Netduino Mini - Cannot get menu on pressing escape!

 

Connected Mini to FTDI Basic -> (pin 24 to 9V, pin 23 to gnd, pin 23 to FTDI Gnd, pin 11 to FTDI TX, Pin 12 to FTDI RX) FTDI is on 3.3V

I get all the boot messages on putty all upto the ready message. Thereafter it freezes and does nothing whether I press escape or any other key. So I dont get the menu to change the default port to TTL UART 

 

 

Any ideas what could be wrong?

 

Hi Chris,

 

Just as we have port expanders for I/O (like the MCP23017 etc.).

What can we deploy to add more serial ports?

I cannot use Netduino Go - as the base is Netduino mini for some specific reasons.

 

Thanks

Hi Steve,



AREF is a pin header which lets you hook in an analog reference. GND is ground (where power flows to). They're both power pins, and can't be used as digital I/O ports.



Yes, true! You can use all 6 analog inputs as digital I/O.

Chris

Hi Chris,

Could you please elaborate how to map analog pins as digital IO?
Say, I wanted to use A4, A5 analog inputs as Digital ops...how do we do it?
[I could not find any enum mappings to do so....]

Thanks

Hi Pankaj,

The mode the pin is in (digital IO or analog) is based on how you use it in software. They all start out in digital mode.

If you connect an analog input, it's read as logic low (false) or logic high (true) by the InputPort class. As long as your analog input is in the range of 0.0-3.3V and is not injecting current into the board, you are generally good to go.

You can certainly multiplex between multiple inputs using external circuitry. This is how A4/A5 work to hook up the extra two analog inputs. Just be sure to use a quality analog switch.

Chris

Thats exactly what I wanted to confirm

Thanks Chris

Repeating my last question... Let me be a bit specific... Say for eg. pin 5 on the Mini is shown as, both a Digital I/O as well as an Analog Input. 1. The mode in which we use it ... Digital I/O or Analog Input depends on how we assign it inside the program. Right? 2. If that is so, then what happens if we connect an analog signal to the pin on the hardware side but in the software we assign it as a Digital I/O? Could this potentially damage the device in certain conditions? 3. Is it possible to externally multiplex this pin between the two types of inputs (analog and digital) using an SPDT relay and periodically switching the relay while simultaneously changing the pin assignment inside the program (evenutally helping us increase the number of I/Os)? Pankaj