1. Behavior ports

• • Bpod interfaces with up to 8 behavior ports.

  • Each port contains wiring for:

    • 1 solenoid valve (12V, <150mA)

    • 1 infrared emitter

    • 1 phototransistor (forms photogate w/ emitter)

    • 1 visible (white) LED

  • An Ethernet (CAT5e) cable connects each behavior port jack on the state machine to a port (lickometer or nose port) in the behavior chamber.

  • At the port end of the cable, the port breakout board interfaces to the photogate, LED and valve.

  • Port input channels report changes in the status of the photogate as behavior events:

    • In (photogate beam was blocked;

      • Logic transition to low level

    • Out (photogate beam was restored)

      • Logic transition to high level

  • Ports in use must be enabled from the settings menu, accessible from the Bpod Console GUI.

2. Wire terminals

• • Bpod can generate events and send triggers using TTL logic on bare wires.

  • Spring terminals provided for 2 inputs and 3 outputs

  • Press the white button above each wire to release the spring contact.

  • Output TTL pulses are 3.3V

  • Input TTL pulses can be 2.5V to 5V, and are optically isolated.

  • Each wire terminal channel has a ground, which must be connected to the ground of the remote device. For the inputs, these are the channels marked '-'.

3. USB, Reset button and power jack

• • Connect Bpod to a computer, using the jack labeled "USB". This is Arduino's native USB port.

  • If you are uploading Bpod firmware and something goes wrong during the upload, you can un-brick your Bpod by connecting the USB cable to "P" and selecting the "programming port" in Arduino's "board" menu.

  • Use the "Reset" button to reset Bpod if necessary.

  • The power (barrel) jack is normally unnecessary. If the solenoid valves fail to open, your USB connection may not be supplying enough power. Connect a 12VDC power adapter (positive center, 1.5A) to the barrel jack to supply additional power.

4. BNC connectors and serial ports

• • TTL logic can be used to trigger Bpod, or for Bpod to trigger other devices via its BNC connectors.

  • 2 BNC outputs labeled "Trigger Out" -> 5V pulses.

  • 2 BNC inputs are optoisolated, and accept 2.5V-5V logic.

  • The serial ports break out three of Arduino Due's UART channels. You can use the Bpod Arduino Shield and an Ethernet cable to send byte codes to control another 32-bit Arduino board: Arduino M0, Arduino Zero, Arduino Due or Adafruit Metro M4. You can also interface with Teensy 3.X and 4.X boards using the Bpod Teensy Shield.