Electrical specs of a Behavior Board

[keith-at-allen]

All of these questions are for the Harp Behavior board.

What is the clock speed of the main processor?
For the Digital Input and output lines, what are the max samples per second?
The analog to digital converters are 1K Hz sampling speed. How many bits are they accurate to?
Whats the impedance, max current and max voltage of the Analog and Digital ports?

[glopesdev]

You can find most high-level specs and documentation on the ATxmega microcontroller used by the Behavior board here: https://harp-tech.org/core.atxmega/

The digital input lines are driven by interrupts so there is no fixed sampling frequency. Typically they are designed to handle at least serial port transmission frequencies (so close to MHz range). However, because each interrupt has to generate an entire serial port message, that will be a limiting factor, generally not an issue until you get to ~5 kHz transmission rates (again mind that detection frequency itself is higher).

Digital outputs can be driven by PWM up to around 10 kHz.

The datasheet for the microcontroller will have even more detail, but it might be easier if you tell us the needs of the application you are interested in, as there are many layers to the documentation which will be hard to tease out without the context of a concrete example.

[keith-at-allen]

So the digital input lines will detect a state change and start to send a serial port message in about 1 micro second. It will miss any other state changes until the serial port message is sent about 200 micro seconds later?

I am at Allen Institute, we have a system of custom PCB and National Instrument DAQs that record behavior data. Lick detection, water delivery, quadrature encoder rotation, 4 cameras, and a few digital lines. I want to upgrade our system to Harp Bonsai but first need to confirm the Harp Bonsai system can record similar data that is as accurate and precise as our current system.

I set up a Harp Bonsai system to record everything with a behavior board. In the process I broke one of the Ethernet port connections and digital input line also one of the supply port pules constantly if the behavior board is powered. I am hoping to learn more about the electrical specs so I know the proper way to attach an oscilloscope, signal generator and loads to the ports.

[keith-at-allen]

Starting with the Cameras is a good place as any. The cameras are triggered every frame by the digital out pout. How many cameras can I trigger from one single port?
The cameras need 3.5 mA each.

[keith-at-allen]

I am using these camera BFS-U3-04S2M-CS USB 3.1 Blackfly® S, Monochrome Camera and need to record with 4 of them. How many cameras can I trigger off one Digital Out port?
Please let me know if you need more information from me.