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Assembly


Setting the EZO™ Boards

  1. Plug female to female cable into the positive and ground pins (see pinout) of the Raspberry Pi GPIO. This produces a 3.3 V power supply when the circuit is closed.
  2. Connect each EZO™ circuit board TX pin (top middle) to the positive cable of the 3.3 V power supply. Connect the ground cable to the circuit board on the specified pin. After closing the circuit, wait for the green LED to change from green to blue.
    • Green Conductivity Board: PGND (bottom right)
    • Red pH Board: PGND (bottom right)
    • Yellow D.O. Board: PGND (bottom right)
    • Black RTD Temperature Board: PRB (bottom middle)


Soldering the ZeMo Board

  1. Remove any tabs protruding from side of ZeMo Board using pliers.
  2. Attach each of the purple Basic EZO™ Inline Voltage Isolators to the ZeMo Board squares marked “ISO”. The text on the voltage isolator should face the same direction as the “ISO” text on the ZeMo board. Solder all 10 pins to the bottom of the ZeMo board.
  3. Attach the black EZO™ RTD Temperature Circuit to the ZeMo Board square marked “TEMP”. The text on the circuit should face the same direction as the “TEMP” text on the ZeMo board. Solder all 6 pins to the bottom of the ZeMo board.
  4. Attach the green EZO™ Conductivity Circuit to the ZeMo Board square marked “EC”. The text on the circuit should face the same direction as the “EC” text on the ZeMo board. Solder all 6 pins to the bottom of the ZeMo board.
  5. Attach the red EZO™ pH Circuit to the ZeMo Board squares marked “PH”. The text on the circuit should face the same direction as the “PH” text on the ZeMo board. Solder to board.
  6. Attach the yellow EZO™ Dissolved Oxygen Circuit to the ZeMo Board squares marked “DO”. The text on the circuit should face the same direction as the “DO” text on the ZeMo board. Solder all 6 pins to the bottom of the ZeMo board.
  7. Attach the blue PCB Ribbon Cable Header to the ZeMo Board square marked “RASPI”. The notch in the wall of the socket should face the outer edge of the ZeMo Board. Solder all 6 pins to the bottom of the ZeMo board.
  8. Attach each of the black Right-Angle BNC Jack Connectors to the unlabeled ZeMo board squares directly beneath each EZO™ Circuit Board. The connectors should extend beyond the outer edge of the board. Solder both pins to the bottom of the ZeMo board.


Assembling Zemo

  1. Remove 3D printing supports from bolt housing and place bolts in housing.
  2. Place the PiTFT screen face down in case and align the screw holes with the bolts. The GPIO pins of the screen should be on the opposite side of the case from the vents.
  3. Screw the brass standoffs into bolts, attaching the screen to the case.
  4. Bend the 6 pin header to a right angle. Cut the pins of the bottom row to the length of the top pins.
  5. Place the 6 pin header on the GPIO pins 1-6 of the PiTFT screen. Pins 1-6 are located furthest from the Adafruit logo.
  6. Attach the ribbon cable to 6 pin header.
  7. Attach the MicroUSB to USB cable to the inner MicroUSB slot of the Raspberry Pi Zero WH. Insert the MircroSD card into the Raspberry Pi.
  8. Place the GPIO pins of the Raspberry Pi into the screen housing.
  9. Attach the ribbon cable to the 2x3 box header of the ZeMo Board.
  10. Place the BNC connectors of the ZeMo Board through the holes on the side of the case. Secure with bolts.
  11. Plug the USB cable into the USB power adapter. The screen should power on and the blue LED of each EZO™ Board should light up.
  12. Attach the ZeMo case to the wall plate.