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IO One mikroShield ​

Overview ​

The IO One mikroShield is a mikroBUSTM add-on board that provides nine signal-voltage-ground (SVG) connectors, a temperature & humidity sensor, as well as a PmodTM Compatible I2C connector.

Example applications ​

  • Smart watering with a Capacitive Soil Moisture Sensor
  • Valve control
  • Servo control
  • 5 V pumps and motors control
  • Temperature monitoring with the SHTC3 or a DS18B20 temperature sensor
  • Humidity monitoring with the SHTC3
  • A/C hacking for walk-in coolers

Features & Specifications ​

  • 9x Signal-Voltage-Ground (SVG) connectors
    • 3x input-only signals
      • Analog or digital inputs
      • Voltage pins 3.3 V or 5 V selection via jumper for the whole group
      • Voltage pins PMOS on/off switch for the whole group
      • 16 Hz RC low-pass filter for each signal that can be removed by removing the corresponding capacitor connection
      • 2 signals require the extension I/Os to work, but can otherwise be used for on/off control through the Voltage pin
    • 3x input-output signals
      • Analog or digital inputs
      • Digital outputs
      • Voltage pins 3.3 V or 5 V selection via jumper for the whole group
      • Voltage pins PMOS on/off switch for the whole group
    • 3x 1-wire signals
      • Fixed 3.3 V on the Voltage pin
      • Single 1-wire bus for the three connectors
      • Controllable via UART or bit-banging
  • SHTC3 I2C Temperature & Humidity Sensor
    • 0.2 oC temperature accuracy
    • 2 % humidity accuracy
  • Digilent PmodTM Compatible I2C connector
    • Complies with the Digilent PmodTM Interface Specification version 1.3.1
    • Includes the optional INT and RESET signals
    • Voltage pins 3.3 V or 5 V selection via jumper
    • Works with most I2C devices, not just PmodTM Compatible modules

Dimensions, and Top & Bottom Views ​

  • Note: Analog and Digital markings have been replaced with Inputs and IOs in the current version.

  • The IO One mikroShield conforms to the "L" size of the mikroBUSTM add-on boards standard.

  • All through-hole pins are aligned with the same 100-mils (2.54 mm) grid with a 50 mils (1.27 mm) offset from the bottom-left corner, making the IO One mikroShield protoboard- and breadboard-friendly.

  • For the SVG connectors, the mikroBUSTM numbers correspond to the SVG conenctor number. For example, A3 corresponds to J3, and D9 corresponds to J9.

Pinout ​

Removing the Inputs' RC Low-Pass Filter ​

There are two options to remove the RC filters on the input-only signals.

  • Unsolder the corresponding capacitor (preferred method)
  • > Do at your own risks < Cut the desired red traces as shown below. Cut across the trace in red and be careful not to damage the traces around it (yellow). In case of doubt, use a multimeter to check if there is contact between the two ends of the trace or between the trace and the surrounding ground plane.

Additional Resources ​