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HEBI I/O Board (Rev C) - I2C and Digital IO Commands
Posted: Tue Jul 21, 2020 8:56 pm
by Reach_TexasA&M
Hi,
I have two questions.
1) Does the IO Board have I2C capabilities?
2) How do you command digital and analog IOs on the IO board? I only see feedback examples for Python...
Thanks!
- Reach Systems - Texas A&M University
Re: HEBI I/O Board (Rev C) - I2C and Digital IO Commands
Posted: Wed Jul 22, 2020 9:19 am
by daniel_wright
Hello,
1) Sadly, we do not support I2C. However, would you be able to provide your use case? We have had this question asked somewhat frequently, and we'd like to investigate what potential use cases we are ignoring.
2) You are correct - I don't see any examples showing how to set pins on the IO board. Sorry about that.
To view which banks correspond to the digital and analog outputs, please view our documentation here:
https://docs.hebi.us/hardware.html#io-board-commands
As for setting pin values, digital output pins expect integer values, and analog expects float. You can set them like this:
Code: Select all
import hebi
cmd = hebi.GroupCommand(1)
# Set pin e3 to 1
cmd.io.e.set_int(3, 1)
# Set pin f2 to 0.7
cmd.io.f.set_float(2, 0.7)
Let me know if this sufficiently helps!
Re: HEBI I/O Board (Rev C) - I2C and Digital IO Commands
Posted: Wed Jul 22, 2020 9:32 am
by curtis_layton
Hi,
One other note - the "analog" outputs are actually PWM outputs that run at 20Khz. To get an analog output, use a R-C low pass filter to remove the carrier frequency.
Here is some general information about how this works:
https://www.allaboutcircuits.com/techni ... g-voltage/
Thank you,
- Curtis