ER-SCOPE-01

Features

• HAGIWO design
• Differences from HAGIWO
  • Using Arduino Pro Mini - smaller package than NANO
    • No USB but USB is not used after download anyway
  • Initially used I2C OLED
    • Probably affects screen refresh rates
    • Switched to SPI OLED
• OLED : 128*64 pixel 0.96inch
• Knob1: Rotary encoder for selection (including push switch)
• Knob2: GAIN
• Toggle SW : AC/DC switching
• TRIG IN : External trigger IN
• Input : Signal to be observed IN
  • Observable voltage is 5 V p-p
• Output : Observable signal OUT (short circuit with INPUT)

HAGIWO Schematic

Design Details

• Built on ER-PROTO-02 card set

Front Panel/OLED Mounting

• Glue on OLED with a couple of drops of Hot Glue in corners
• White on Black P Touch labels

• 7 pin right angle header mounted to rear of daughtercard
• OLED - replace straight header with 1x7 right angle header

• SPI wire colors on schematic

• Tuck OLED wiring around switch

On Controls card

• Wire top pin of R7 to top pin of R17 (connects J5 to J6 tip)
• SW1 goes in cutout at J1
• SW1 up = DC coupled, down = AC coupled
• R7 stands up at bottom of R7 and wires to SW1 center
• 4.7uF cap from SW1 top to SW1 bottom
  • + side of cap to SW1 bottom
  • - side of cap to SW1 top
• Wire from J5 tip to SW1 bottom

On Daughterboard

CPU

• Arduino Pro Mini CPU

• I2C header used with I2C OLED

Pot/Rotary Encoder connections

• Solid resistor wires are "stiff" enough to not need to use insulation

Jacks connections

Power

Software

• ER-SCOPE Hardware tests
• ER_SCOPE_V01 - Application code I2C Display
• Resources (ATMega328)

Sketch uses 19866 bytes (64%) of program storage space. Maximum is 30720 bytes.
Global variables use 807 bytes (39%) of dynamic memory, leaving 1241 bytes for local variables.
Maximum is 2048 bytes.

• ER-GATE-SEQ-01 on left