13 replies to this topic

[Mike Hole]

I recently purchased the Electronic Brick Starter kit for use on my Netduino Plus board. Loving the experience so far . I also purchased the Keypad Module (BUS) http://proto-pic.co....pad-module-bus/ not realising that this is a discontinued product I have tried to work out how this interfaces with the Netduino and have had limited success in getting an output that I can understand. I have searched the internet, the forum and WIKI but cannot find any information on how this board works with any Arduino board. Does anybody have any information available that you are able to point me towards? Thanks, Mike

[Bainesbunch]

Hello,

If you look at the Arduino code that is on the webpage for this keypad it looks like a basic 3x3 multiplexed matrix

void setup() 
{
  Serial.begin(9600);
  for(i=0;i<3;i++) 	pinMode((KeyOPin + i), OUTPUT); 	
  for (i=0;i<3;i++)	pinMode(( KeyIPin + i), INPUT); 
} 	

void loop()
{
   scankey();
   if (press)
   {
	press=0;
	Serial.print("Keycode is ");
	Serial.println(oldkey,HEX);
   }
}

void scankey()
{
  reg = 1;
  for (i=0;i<3;i++)
  {
	for (n=0;n<3;n++)
	{
      if((reg>>n)&1)        digitalWrite(KeyOPin+n , HIGH); 
      else                  digitalWrite(KeyOPin+n , LOW);
	}   
	for (n=0;n<3;n++)
	{
  	if(digitalRead(KeyIPin + n))
  	{ 	
    	key = key | (1<<(4+n));	
    	key = key | reg ; 
      }                    
	}
	reg = reg << 1;
  }

  if (key & 0xf8)
  {
	if (key!=oldkey)   {   
  	press = 1;  
  	oldkey = key ; 
	}
  }
  else   	oldkey = 0;


  key = 0;
}

it is an easy task to translate this code from the Arduino C++ Variant to C# or VB

It would be useful to know the pin outs on the IDC connector they have attached to the board so you know which pins connect to the 3 ports that are outputs and which should be connected to the inputs.

If you are having problem drop me a PM or ask further here and I can do the translation for you. But it is best to try yourself first.

Cheers Pete.

[Stefan]

Hello,

If you look at the Arduino code that is on the webpage for this keypad it looks like a basic 3x3 multiplexed matrix

If it's a multiplexed matrix, then there's netduino code:
http://netmftoolbox....re.MatrixKeyPad

[Mike Hole]

Hi Both, I have tried your code Stefan but it's not worked I have also tried a simple app that just lists pin values for the conected pins: public static void Main() { TristatePort d2 = new TristatePort(Pins.GPIO_PIN_D2, false, false, Port.ResistorMode.PullUp); TristatePort d3 = new TristatePort(Pins.GPIO_PIN_D3, false, false, Port.ResistorMode.PullUp); TristatePort d4 = new TristatePort(Pins.GPIO_PIN_D4, false, false, Port.ResistorMode.PullUp); TristatePort d5 = new TristatePort(Pins.GPIO_PIN_D5, false, false, Port.ResistorMode.PullUp); TristatePort d6 = new TristatePort(Pins.GPIO_PIN_D6, false, false, Port.ResistorMode.PullUp); TristatePort d7 = new TristatePort(Pins.GPIO_PIN_D7, false, false, Port.ResistorMode.PullUp); TristatePort d8 = new TristatePort(Pins.GPIO_PIN_D8, false, false, Port.ResistorMode.PullUp); TristatePort d9 = new TristatePort(Pins.GPIO_PIN_D9, false, false, Port.ResistorMode.PullUp); while (true) { Debug.Print( " d2: " + d2.Read().ToString() + " d3: " + d3.Read().ToString() + " d4: " + d4.Read().ToString() + " d5: " + d5.Read().ToString() + " d6: " + d6.Read().ToString() + " d7: " + d7.Read().ToString() + " d8: " + d8.Read().ToString() + " d9: " + d9.Read().ToString() ); } } With this I only get changes in D5, D6 and D7 for the rows but none of the other pins show a change. Could it be that I have not set up the pins correctly in code?

[Stefan]

I have tried your code Stefan but it's not worked

Have you configured the pins correctly? The class is generic for matrix keypads, but the pins can be different with your keypad.

I have also tried a simple app that just lists pin values for the conected pins:

You've got them all just reading a value, but that's not how it works. Look at the diagram on the link I provided. A signal is sent from an output port to an input port. Rows are input ports, columns are output ports (or the other way around, doesn't matter).

[Mike Hole]

Aha! Ok will I will try that.

[Bainesbunch]

Aha! Ok will I will try that.

do you have a pinout for this keyboard ?

[Mike Hole]

Nope can't find any documentation anywhere If I did I would know how to feed Stefan's code above with teh right pins. Looks like it's a case of try different combinations ntil it works. Using the electronic brick it maps pins to ports for you but without docs I have to guess where.

[Stefan]

From the C sample code:

int  KeyOPin = 5;              
int KeyIPin = 2; 

  for(i=0;i<3;i++)     pinMode((KeyOPin + i), OUTPUT);     
  for (i=0;i<3;i++)    pinMode(( KeyIPin + i), INPUT);

So I take it pins 5, 6, 7 are output and pins 2, 3, 4 are input.

[Mario Vernari]

Mike, if you have any multimeter, switch it as "Ohms", then try the various combinations of pins. When a key is pressed only a row and a column should give a low value of resistance (under an hundred of Ohms). Hope it helps. Cheers

[Mike Hole]

From the C sample code:

int  KeyOPin = 5;              
int KeyIPin = 2; 

  for(i=0;i<3;i++)     pinMode((KeyOPin + i), OUTPUT);     
  for (i=0;i<3;i++)    pinMode(( KeyIPin + i), INPUT);

So I take it pins 5, 6, 7 are output and pins 2, 3, 4 are input.

Hadn't spotted the numbers there you may have it but I am now home and unable to test until tomorrow

[Mike Hole]

Arrghgg this is frustrating looks like a multimeter is in order (and there was me thinking a component based kit would make life easier). Trying this (and combinations of the pins in different orders + swapping the rows for the columns): // Row pins. The keypad exists out of 4 rows. Cpu.Pin[] RowPins = { Pins.GPIO_PIN_D2, Pins.GPIO_PIN_D3, Pins.GPIO_PIN_D4 }; // Col pins. The keypad exists out of 3 columns. Cpu.Pin[] ColPins = { Pins.GPIO_PIN_D5, Pins.GPIO_PIN_D6, Pins.GPIO_PIN_D7 }; The best results I get are: Top Row: Key pressed: 6 Key released: 6 Key pressed: 6 Key released: 6 Key pressed: 6 Key released: 6 Middle Row: Key pressed: 7 Key released: 7 Key pressed: 7 Key released: 7 Key pressed: 7 Key released: 7 Key pressed: 7 Key released: 7 Bottom Row: Key pressed: 8 Key released: 8 Key pressed: 8 Key released: 8 Key pressed: 8 Key released: 8 Key pressed: 8 Key released: 8

[Mike Hole]

Yay this works for me now all I needs tydying up and events added but got there in the end:

public static void Main()
{

OutputPort[] outP =
{
new OutputPort(Pins.GPIO_PIN_D5, false),
new OutputPort(Pins.GPIO_PIN_D6, false),
new OutputPort(Pins.GPIO_PIN_D7, false)
};

InputPort[] inP =
{
new InputPort(Pins.GPIO_PIN_D2, true, Port.ResistorMode.PullUp),
new InputPort(Pins.GPIO_PIN_D3, true, Port.ResistorMode.PullUp),
new InputPort(Pins.GPIO_PIN_D4, true, Port.ResistorMode.PullUp)
};

while (true)
{
for (int o = 0; o < 3; o++)
{
outP[o].Write(true);


for (int i = 0; i < 3; i++)
{
if (inP[i].Read())
Debug.Print( o.ToString() + " - " + i.ToString());
}

outP[o].Write(false);
}
}
}

[Bainesbunch]

Well done !! Now go and have some more fun