EKA/DET

What does EKA and DET stand for?

German terms for a user interface device:

Abbr.	German	Einglish description
EKA	Eingabekontrollanzeige	"Input control display" - 32 characters of alpha numeric LED dot matrix display
DET	Dateneingabetastatur	"Data Input Keypad" - a numeric key pad with a load of additional function keys

Team work

This device is a real team effort. It consists of the following components:

• The processor board was originally meant as development platform for the ATmega128 processor by its designer Bernd Wisotzki. But it proved useful because of the count of IO pins that are easily accessible.

• The software that runs on the processor was developed by Moritz Hebert.

• A board that holds the four dot matrix displays with eight characters each was designed by Reinhard Müller

• The key pad is made from two recycled telephones by Michael Weinert

• The beautiful box that integrates EKA, DET and the processor board by Michael Weinert

External interfaces

• The RS232 of the processor board is used to connect to a Computer that runs a software that emulates the ZN800 system. This can be the ZN800 software from Moritz.
  The protocol is defined here.

• A DC input is used to connect a wall wart for power supply.

• The processor board can be populated with a LocoNet interface that is currently not used.

Internal interfaces

The processor board has five connectors for (more or less byte wide) ports in the same style as the STK500 development board:

Bit0			1	2			Bit1
Bit2			3	4			Bit3
Bit4			5	6			Bit5
Bit6			7	8			Bit7
GND			9	10			Vcc

EKA - Display

Address: Port B = SV13		Control: Port A = SV14		Data: Port F = SV16
Connector Processor Display 1 PORTB0 N.C. 2 PORTB1 N.C. 3 PORTB2 A0 4 PORTB3 A1 5 PORTB4 A2 6 PORTB5 A3 7 PORTB6 A4 8 PORTB7 FL 9 GND 10 Vcc		Connector Processor Display 1 PORTA0 /RD 2 PORTA1 /WR 3 PORTA2 /RST 4 PORTA3 N.C. 5 PORTA4 /CE1 6 PORTA5 /CE2 7 PORTA6 /CE3 8 PORTA7 /CE4 9 GND 10 Vcc		Connector Processor Display 1 PORTF0 D0 2..7 ... ... 8 PORTF7 D7 9 GND 10 Vcc

DET - key pad

1 2 3 4 5 6 7 8 d 7 8 9 H F (d) (o) ZNL c 4 5 6 UHR VG (e) (a) ANZ b 1 2 3 R ANB ? (b) SPE a 0 L T LOE ANN LOZ (c) ZNS		This table shows the keypad with the button labels (white background) and the names of the colums (1..8) and rows (d..a).
		(o) = name of own US
		(a) to (e) = names of neighbour US

Rows: Port C = SV12		Columns: Port D = SV11		DET seen from below
Connector Processor Display 1 PORTC0 d 2 PORTC1 c 3 PORTC2 b 4 PORTC3 a 5 PORTC4 N.C. 6 PORTC5 N.C. 7 PORTC6 N.C. 8 PORTC7 N.C. 9 GND N.C. 10 Vcc N.C.		Connector Processor Display 1 PORTD0 1 2 PORTD1 2 3 PORTD2 3 4 PORTD3 4 5 PORTD4 5 6 PORTD5 6 7 PORTD6 7 8 PORTD7 8 9 GND N.C. 10 Vcc N.C.
				Little breadboard below the DET: cable to processor boards 1 2 3 4 5 6 7 8 d c a b left columns right columns - rows cable to key matrix The pink pins are swapped as can be seen on the foto, see arrow!

Author of this page: Stefan Bormann.