Table of Contents

'ELO

Illuminated encoders and OLEDs mounted at 45 degrees. Optional touch sensors.

Hardware mapping

sr_led_map.ods

Schematic

WS2812 LEDs are arranged in a snake pattern entering at J1 and exiting at J2. R1 should be installed as a resistor 220-470R for the first module only and as a wire link for any subsequent WS2812 modules. There are pads for RC termination, which shouldn't be required.

A DIN chain scans the encoders and touch sensors coming in on J3 and out on J4. The encoders are assigned in columns to a 165 shift register with the top position using D0/D1, the second D1/D2, etc. Note that the clear-shaft encoders have the pin directions swapped; this should be taken into account in an MB_NG file. In theory the SRIO chain could be extended from J4.

There are 16 separate touch sensor circuits as shown (circuit design adapted from Talking Electronics):

The first inverter comprises an oscillator feeding into another inverter. By touching the “LINK” part, the capacitance increases. The third inverter forms a comparator. In the normal state, the oscillator keeps the gate output low. When touched, the oscillator will “bleed” through and set the gate high. The actual part values may need adjusting to suit your own body/environment. To use plates mounted onto the encoder bodies, solder a wire link across the TS parts as noted. To use other metal pieces (e.g. an external keyboard), connect a wire to the pads adjacent to surface-mount parts.

The OLED displays are connected as follows:

The reset circuits R9/R10/C29/C30 should be installed. The termination circuits R3-6/C25-28 shouldn't be required. When wiring ribbon cables, the end attached to the ELO board should have two IDCs on it; there is no connection on the PCB for the clock/data etc. lines between the two pairs of displays.

+5V Power enters through J7 and D1. There is no connection to +5V on other headers, apart from J4 to potentially drive SRIO modules.


BOM v1.0

Type Part Value Device
Caps C1 10—100uF CPOL-EU-1
C2 100n C1206
C3 100n C1206
C4 100n C1206
C5 100n C1206
C6 100n C1206
C7 100n C1206
C8 100n C1206
C9 100n C1206
C10 100n C1206
C11 100n C1206
C12 100n C1206
C13 100n C1206
C14 100n C1206
C15 100n C1206
C16 100n C1206
C17 100n C1206
C18 DNF
C19 100n C1206
C20 100n C1206
C21 100n C1206
C22 100n C1206
C23 100n C1206
C24 100n C1206
C25 DNF
C26 DNF
C27 DNF
C28 DNF
C29 10uF CPOL-EUE2.5-5
C30 10uF CPOL-EUE2.5-5
C31 5p C-EUC1206
C32 5p C-EUC1206
C33 5p C-EUC1206
C34 5p C-EUC1206
C35 5p C-EUC1206
C36 5p C-EUC1206
C37 5p C-EUC1206
C38 5p C-EUC1206
C39 5p C-EUC1206
C40 5p C-EUC1206
C41 5p C-EUC1206
C42 5p C-EUC1206
C43 5p C-EUC1206
C44 5p C-EUC1206
C45 5p C-EUC1206
C46 5p C-EUC1206
C47 10p C-EUC1206
C48 10p C-EUC1206
C49 10p C-EUC1206
C50 10p C-EUC1206
C51 10p C-EUC1206
C52 10p C-EUC1206
C53 10p C-EUC1206
C54 10p C-EUC1206
C55 10p C-EUC1206
C56 10p C-EUC1206
C57 10p C-EUC1206
C58 10p C-EUC1206
C59 10p C-EUC1206
C60 10p C-EUC1206
C61 10p C-EUC1206
C62 10p C-EUC1206
C63 1n C-EUC1206
C64 1n C-EUC1206
C65 1n C-EUC1206
C66 1n C-EUC1206
C67 1n C-EUC1206
C68 1n C-EUC1206
C69 1n C-EUC1206
C70 1n C-EUC1206
C71 1n C-EUC1206
C72 1n C-EUC1206
C73 1n C-EUC1206
C74 1n C-EUC1206
C75 1n C-EUC1206
C76 1n C-EUC1206
C77 1n C-EUC1206
C78 1n C-EUC1206
C79 10n C-EUC1206
C80 10n C-EUC1206
C81 10n C-EUC1206
C82 10n C-EUC1206
C83 10n C-EUC1206
C84 10n C-EUC1206
C85 10n C-EUC1206
C86 10n C-EUC1206
C87 10n C-EUC1206
C88 10n C-EUC1206
C89 10n C-EUC1206
C90 10n C-EUC1206
C91 10n C-EUC1206
C92 10n C-EUC1206
C93 10n C-EUC1206
C94 10n C-EUC1206
C95 100n C1206
C96 100n C1206
C97 100n C1206
C98 100n C1206
C99 100n C1206
C100 100n C1206
C101 100n C1206
C102 100n C1206
Diodes D1 1N5817 1N5817-B
DD1 BAV99 BAV99
DD2 BAV99 BAV99
DD3 BAV99 BAV99
DD4 BAV99 BAV99
DD5 BAV99 BAV99
DD6 BAV99 BAV99
DD7 BAV99 BAV99
DD8 BAV99 BAV99
DD9 BAV99 BAV99
DD10 BAV99 BAV99
DD11 BAV99 BAV99
DD12 BAV99 BAV99
DD13 BAV99 BAV99
DD14 BAV99 BAV99
DD15 BAV99 BAV99
DD16 BAV99 BAV99
Encoders EN1 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN2 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN3 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN4 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN5 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN6 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN7 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN8 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN9 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN10 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN11 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN12 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN13 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN14 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN15 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
EN16 ENCODER_NO_SWITCHSW ENCODER_NO_SWITCH
ICs IC1 74HC165D SOIC16
IC2 74HC165D SOIC16
IC3 74HC165D SOIC16
IC4 74HC165D SOIC16
IC5 74HC165D SOIC16
IC6 74HC165D SOIC16
IC7 74HC14D SOIC14
IC8 74HC14D SOIC14
IC9 74HC14D SOIC14
IC10 74HC14D SOIC14
IC11 74HC14D SOIC14
IC12 74HC14D SOIC14
IC13 74HC14D SOIC14
IC14 74HC14D SOIC14
Headers J1 WS2812 IN
J2 WS2812 OUT
J3 SRIO IN PAK100/2500-10
J4 SRIO OUT PAK100/2500-10
J5 DISP1-2 PINHD-2X54WALL
J6 DISP3-4 PINHD-2X54WALL
J7 +5V 22-23-2031
Displays LCD1 0.96_OLED LCD_OLED_0.96_PINS
LCD2 0.96_OLED LCD_OLED_0.96_PINS
LCD3 0.96_OLED LCD_OLED_0.96_PINS
LCD4 0.96_OLED LCD_OLED_0.96_PINS
LEDs LED1 WS2812B WS2812B
LED2 WS2812B WS2812B
LED3 WS2812B WS2812B
LED4 WS2812B WS2812B
LED5 WS2812B WS2812B
LED6 WS2812B WS2812B
LED7 WS2812B WS2812B
LED8 WS2812B WS2812B
LED9 WS2812B WS2812B
LED10 WS2812B WS2812B
LED11 WS2812B WS2812B
LED12 WS2812B WS2812B
LED13 WS2812B WS2812B
LED14 WS2812B WS2812B
LED15 WS2812B WS2812B
LED16 WS2812B WS2812B
Resistors R1 220-470R R-EU_0204/7
R2 DNF
R3 DNF
R4 DNF
R5 DNF
R6 DNF
R7 DNF
R8 DNF
R9 2k2 R-EU_0204/7
R10 2k2 R-EU_0204/7
R11 10k R-EU_R1206
R12 10k R-EU_R1206
R13 10k R-EU_R1206
R14 10k R-EU_R1206
R15 10k R-EU_R1206
R16 10k R-EU_R1206
R17 10k R-EU_R1206
R18 10k R-EU_R1206
R19 10k R-EU_R1206
R20 10k R-EU_R1206
R21 10k R-EU_R1206
R22 10k R-EU_R1206
R23 10k R-EU_R1206
R24 10k R-EU_R1206
R25 10k R-EU_R1206
R26 10k R-EU_R1206
R27 1M R-EU_R1206
R28 1M R-EU_R1206
R29 1M R-EU_R1206
R30 1M R-EU_R1206
R31 1M R-EU_R1206
R32 1M R-EU_R1206
R33 1M R-EU_R1206
R34 1M R-EU_R1206
R35 1M R-EU_R1206
R36 1M R-EU_R1206
R37 1M R-EU_R1206
R38 1M R-EU_R1206
R39 1M R-EU_R1206
R40 1M R-EU_R1206
R41 1M R-EU_R1206
R42 1M R-EU_R1206
R43 1M R-EU_R1206
R44 1M R-EU_R1206
R45 1M R-EU_R1206
R46 1M R-EU_R1206
R47 1M R-EU_R1206
R48 1M R-EU_R1206
R49 1M R-EU_R1206
R50 1M R-EU_R1206
R51 1M R-EU_R1206
R52 1M R-EU_R1206
R53 1M R-EU_R1206
R54 1M R-EU_R1206
R55 1M R-EU_R1206
R56 1M R-EU_R1206
R57 1M R-EU_R1206
R58 1M R-EU_R1206
R59 10K R-EU_R1206
R60 10K R-EU_R1206
R61 10K R-EU_R1206
R62 10K R-EU_R1206
R63 10K R-EU_R1206
R64 10K R-EU_R1206
R65 10K R-EU_R1206
R66 10K R-EU_R1206
R67 10K R-EU_R1206
R68 10K R-EU_R1206
R69 10K R-EU_R1206
R70 10K R-EU_R1206
R71 10K R-EU_R1206
R72 10K R-EU_R1206
R73 10K R-EU_R1206
R74 10K R-EU_R1206
Resistor networks RN1 10k 652-4816P-T2LF-10K
RN2 DNF/see notes
RN3 10k 652-4816P-T2LF-10K
RN4 10k 652-4816P-T2LF-10K
RN5 DNF/see notes
RN6 10k 652-4816P-T2LF-10K
Touch sensors TS1 R-EU_TS 0204TS
TS2 R-EU_TS 0204TS
TS3 R-EU_TS 0204TS
TS4 R-EU_TS 0204TS
TS5 R-EU_TS 0204TS
TS6 R-EU_TS 0204TS
TS7 R-EU_TS 0204TS
TS8 R-EU_TS 0204TS
TS9 R-EU_TS 0204TS
TS10 R-EU_TS 0204TS
TS11 R-EU_TS 0204TS
TS12 R-EU_TS 0204TS
TS13 R-EU_TS 0204TS
TS14 R-EU_TS 0204TS
TS15 R-EU_TS 0204TS
TS16 R-EU_TS 0204TS

Versions

v1.0: first release.

Assembly

If using touch sensors, install the SMT parts first. Capacitor pads have rounded corners and there is a silkscreen line along the longer edge to help orient the parts. See above for how to connect TS parts (normally a wire link).

The WS2812 LEDs and associated caps should come next, followed by the SMT shift registers and resistor networks. See above for notes on the RNs.

Here it is a good idea to test the LED functions before overlaying the encoders.

The encoders can then be installed over the LEDs. They need to be raised above the LED (e.g. using a spacer piece of 2mm) so the shaft turns freely, and the mounting legs should be straightened for a secure connection.

OLED displays should go in last. As they mount over the touch sensors, it would be smart to test the touch sensor operation before they are placed.

Example usage:

elo_col1.zip


Interconnection to Core

Dimensions

elo_v1.0_doku.zip


License

Currently the design is © 2018 antilog devices with all rights reserved; all documentation is CC BY-NC-SA 3.0.