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  • in reply to: Need a little help. #739
    Frankie
    Participant

    No worries.
    Did you get my email? I can send these arms out to you.

    in reply to: Need a little help. #735
    Frankie
    Participant

    I can print them at 184.5mm no problem. I just don’t have them at the 194mm length. I’ll run them tomorrow am. It’s just a bit of filament and a bit of time.

    in reply to: Need a little help. #733
    Frankie
    Participant

    I think I misunderstood your request. I thought you wanted them at the original length. Which is about 94mm short of 194mm. Even Matt’s is 184.5mm.
    Do you have an .STL of the arms at 194mm in length?

    in reply to: Need a little help. #725
    Frankie
    Participant

    I printed the parts over the weekend.
    Printed parts

    We should exchange addresses over email.
    My name is Jeff Houghten and my email address is my first name at my last name dot com.

    in reply to: Need a little help. #718
    Frankie
    Participant

    I’m game.

    I cut the acrylic pieces with a hacksaw and drilled the holes with a drill press, so they’re a little sloppy. The belts are doing most of the work keeping the main shaft straight.
    Some accurately laser cut pieces would be nice.

    I have only PLA filament on hand. So both pieces will be printing in that.

    in reply to: No power when stepper drivers are installed #707
    Frankie
    Participant

    I got it to compile correctly. I was also able to enter the SSID and password if the stepper drivers were not installed.
    After making the modification that RickG suggested, it works fine.

    On the Adafruit website it has this information about the pins:
    12 – This is GPIO #12 and also an analog input A11 on ADC #2. This pin has a pull-down resistor built into it, we recommend using it as an output only, or making sure that the pull-down is not affected during boot.

    The stepper drivers that I’m using must be pushing that pin high.
    Changing to pin 33 for the enable pin worked fine.
    I scraped off the trace to 12 and soldered a fine wire to 33 and changed the config to use 33 as the enable pin.

    in reply to: No power when stepper drivers are installed #694
    Frankie
    Participant

    Thank you RickG!
    I’m using a TMC2225.
    Hopefully moving to GPIO 33 will help. I’ll test it on the breadboard before I modify the PCB.

    Do you know why it’s happening? I was trying to read some of the esp32.com forums about the error. I thought it was a power issue. However, from the site:

    There are three “power domains” on the chip, i.e. three separate power input sections.
    Domain VDD3P3_CPU in on pin 37 (NOT GPIO 37) supplies power to GPIO5; GPIO18; GPIO23; GPIO19; GPIO22; GPIO3; GPIO1; and GPIO21.
    This domain can SOURCE up to 40mA and SINK up to 28mA on STRENGTH 3

    Domain VDD3P3_RTC in on pin 19 (NOT GPIO 19) supplies power to GPIO36; GPIO37; GPIO38; GPIO39 ; GPIO34; GPIO35; GPIO32; GPIO33; GPIO25; GPIO26; GPIO27;GPIO14; GPIO12; GPIO13; GPIO15; GPIO2; GPIO0; and GPIO4.
    Remember GPIO34..GPIO39 are inputs only, so cannot be used to source or sink current meaningfully.
    This domain can SOURCE 40mA and SINK up to 28mA on STRENGTH 3

    Domain VDD_SDIO in on pin 26 (NOT GPIO 26) is a special bidirectional power pin which can be driven by 3.3V externally, route VDD3P3_RTC via an internal network, or supply 1.8V via a LDO regulator. The LDO regulator can only supply 40mA. If using power through VDD3P3_RTC, the internal network will cause a voltage drop; the higher the current drawn, the more voltage will be lost in the chip and more heat generated.
    Domain VDD_SDIO supplies power to GPIO16; GPIO17; GPIO9; GPIO10; GPIO11; GPIO6; GPIO7; and GPIO8
    This domain can SOURCE up to 20mA and SINK up to 28mA on STRENGTH 3 (Remember the 40mA total limit at 1.8V)

    The sum of all the I/O current may not exceed 1200mA

    And as a bonus hard-to-find figure, the internal pull-up and pull-down resistors are 45kOhms each.

    Which seems to say that GPIO 12 and GPIO 33 are in the same power domain. So, maybe it’s a different issue?

Viewing 7 posts - 1 through 7 (of 7 total)