Description

This module captures voltage signals from 8 analog input channels. It can detect voltage threshold crossing events and send them to the Bpod state machine. On trigger from the state machine, it can log data to an internal microSD card. It can also stream analog signals to a MATLAB GUI for threshold setup, or directly to an output module (Analog Output, DDS or Arduino Shield) for closed-loop applications. Two 3.3V digital i/o lines are provided as a general purpose TTL interface, and can provide power to resistive sensors. The analog input module's hardware, firmware and software were principally developed by Federico Carnevale.

Specifications

Compatability

• Requires Bpod v0.7 or newer.

Processor

• ARM Cortex M4: Freescale MK66FX1M0VMD18 as part of the Teensy 3.6 development platform
• 180MHz Clock Speed
• 256KB sRAM
• Programmable using the Arduino language

Serial I/O

• Bpod State Machine (via RS-485 buffered UART, 1.3Mb/s)
• Second Bpod Module (via RS-485 buffered UART, 7.3Mb/s)
• USB

Analog Inputs

• 8 input channels, buffered by low-noise op amps and digitized by a 12-bit ADC: Analog Devices AD7327
• Input Range: software selectable for each channel among:
• [-10 to +10V]
• [-5 to +5V]
• [-2.5 to +2.5V]
• [0 to 10V]

Digital Inputs

• Two digital I/O lines are provided (3.3V logic, not 5V tolerant)
• The lines can be configured as a hardware I2C interface for custom applications

Firmware functions

• Configurable sampling rate: up to 10kHz (8 channels)
• Start/Stop Data logging to microSD card
• Transfer logged data via USB to computer
• Set voltage threshold and threshold reset levels for event generation
• Start/Stop streaming analog signal to a linked output module

Memory

• 8GB MicroSD card included

Dimensions

• L: 10cm (4")
• W: 12cm (4.5")
• H: 4cm (1.5")