MCB40A

Rotary Encoder with Push Switch

The MCB40A rotary encoder with push switch accessory can be connected to CN7 on the TFT module. The rotary encoder can be used to control a predefined variable (ENCVAL1 OR ENCVAL2) which when used in functions can control numerous events such as scrolling through a list to incrementing a value. The additional push switch on the MCB40A allows for a function to be called on the key press allowing for the rotary encoder to act as a menu select control where you can scroll through a list and press the switch to select an item.
Each rotary encoder uses 5 pins allowing for two separate MCB40A to be connected to a single 10 way IDC cable.

2D mechanical

View Photograph

	1	2	3	4	5	6	7	8	9	10
Con1	-	High	-	Port B	-	Low	-	Switch	-	Port A

Rotary Encoder Properties

ALPS - EC12E1224402 - ENCODER, VERTICAL, 12 DET, 12PPR+SW
No. of Channels	2
Connector Type	Pin
Dielectric Strength VAC	50V
Encoder Resolution	12
External Depth	14mm
External Length / Height	6mm
External Width	13.2mm
No. of Detents	12
No. of Pulses Per Revolution	12
Operating Temperature Max	+70°C
Operating Temperature Min	-10°C
Operating Temperature Range	-10°C to +70°C
Pulse Output Count	12
Rotation Mechanical Angle	360°
Rotational Life Cycles	30000
Series	EC12
Shaft Diameter	6mm
Shaft Length - Metric	8.5mm
Supply Current	0.5mA
Supply Voltage Max	5VDC
Supply Voltage V DC	50V
Torque Max	20mN-m
Torque Min	3mN-m
Type	Vertical

Rotary Encoder Setup

SETUP(ENC)
{
active = 1/2/12; // N=none active, 1=enc1 active, 2 = enc2 active, 12 = both active
a1 = \\xx; // port number for enc1 A channel
b1 = \\xx; // port number for enc1 B channel
a2 = \\xx; // port number for enc2 A channel
b2 = \\xx; // port number for enc2 B channel
debounce1 = n; // debounce time in ms for enc1 (1 - 100ms)
debounce2 = n; // debounce time in ms for enc2 (1 - 100ms)
timeout1 = n; // timeout period in ms for enc1 (1 - 1000ms)
timeout2 = n; // timeout period in ms for enc2 (1 - 1000ms)
mode1 = n; // encoder type (1 or 2) for enc1
mode2 = n; // encoder type (1 or 2) for enc2
}

Connection and Pinout Example for Connecting Two Rotary Encoders

To use one ribbon cable with two Rotary Encoders you will need to set up a ribbon cable as pictured below.
You will then need to connect the first MCB40A to the connector on the right (picture below) this rotary encoder will use K01,K03,K05,K07,K09
The second MCB40A will need to be inverted, in the picture the ribbon cable has been twisted to do this.
(the ridge on the left connector will need to be removed so that it can plug into the MCB40A) this MCB40A will use K00,K02,K04,K06,K08.
You will then need to connect the top connector to CN7 from K00-K09.

Below is an example code and pinout for two rotary encoders on a single 10 way IDC cable connected to the K00-K09 using the ribbon cable as pictured above.

	High	Low	Port A	Port B	Switch
MCB40A (1)	K01	K05	K09	K03	K07
MCB40A (2)	K08	K04	K00	K06	K02

Example Code

SETUP(KEYIO) {active=\\0003ff; inp = \\000084; trig = \\000084; edge = \\000000; }

SETUP(ENC)
      {
      active = 12; // N=none active, Y or 1=enc1 active, 2 = enc2 active, 12 = both active
      a1 = \\09; // port number for enc1 A channel
      b1 = \\03; // port number for enc1 B channel
      a2 = \\00; // port number for enc2 A channel
      b2 = \\06; // port number for enc2 B channel
      debounce1 = 2; // debounce time in ms for enc1 (1 - 100ms)
      debounce2 = 2; // debounce time in ms for enc2 (1 - 100ms)
      mode1 = 1; // encoder type (1 or 2) for enc1
      mode2 = 1; // encoder type (1 or 2) for enc2
      }

   LOAD(K01,1);
   LOAD(K08,1);

STYLE(ps, Page) {back = black;}
STYLE(ts, Text) {font = Ascii32; col = white;}

    INT(change1, ENC1, fnc1);
    INT(clear1, K07, fnc3);
    INT(change2, ENC2, fnc2);
    INT(clear2, K02, fnc4);

PAGE(page1,ps)
{
   POSN(120,136); TEXT(t1,"0",ts);
   POSN(360,136); TEXT(t2,"0",ts);
   }

FUNC(fnc1){ TEXT(t1,ENCVAL1);; }
FUNC(fnc2){ TEXT(t2,ENCVAL2);; }
FUNC(fnc3){ LOAD(ENCVAL1,0);TEXT(t1,ENCVAL1);; }
FUNC(fnc4){ LOAD(ENCVAL2,0);TEXT(t2,ENCVAL2);; }

SHOW(page1);