nanoDLP

Good job on this.

But is the change from 10k to 20k to protect the non 5v tolerant Pi pins?.. I tried the circuit with 10K resistors and messed up my Pi GPIO (unpredictable behavior now)  Instead I rewired the circuit to pull 3.3v from the Pi 40 pin header and apply that to the Stepper carrier header as well as use the 3.3v with a 10k pull up on all the input pins.

This has resulted in a much more reliable and predictable setup.

I'm inclined to update the schematics since TOS seems to have gone MIA.

Mo

Just an information that could maybe help some of you : I'm trying to build a Sla printer based on Nanodlp / Pi 4/ 2K LCD / Direct control with the Nanodlp Shield V2.2. After lots of issues, my configuration on PI4 doesn't work : I already get GPIO break lock messages. All the settings seems to be right (the control shield is correctly configured on none  (that is no usb)). So, I have decided to continue my tests with my old PI2 and for the first time, NanoDLP works fine with the GPIO pins (no break lock messages). However, when I use the nanodlp shield 2.2 connected on the PI board, the stepper motor always didn't move. By reading the documentation of Pololu for the DRV8825 driver, I believe that something is probably missing on the board shield V2.2 : The pins Reset + Sleep (RST/SLP) are connected together (that's ok), but it is a floating connection. To avoid this, you just have to add a link to a 5V pin with the RST/SLP pins as recommanded in the Pololu documentation. Thanks to this, the control of the stepper moteur works fine, for the first time for me ... Happy to get a little success at the end of the week So maybe this information should be added in the documentation of Johanvd if possible in order to help. This modification has only been tested with a DRV8825 and not with A4988 driver. I hope to go back on PI4 later, but for the moment I want to test if I can get a successful  print... but there is a lots of work to be done before that...

Hello Harish,

On my side, I don't have the same issue as you have encoutered. But may be you can make some following tests to localise what's going wrong :
- Go on the Pololu web site to get the minimal wiring for the DRV8825
- Check the connectors pin of the stepper motor to verify if there's no mistake in the pins for each coils connected to the DRV8825 : Between the nanoshield V2.2 and the connector of the DRV8825 the information for connecting each coils are a little bit confusing : Each pin for the coil needs to correspond to the good pin on the DRV8825 board.
- Use the DRV8825 board alone (without the entire nanoshield V2.2) on a test plate to verify if with the minimal wiring you can drive your stepper motor  :
You just have to connect the board on the VDD voltage 5V, GND with the PI3, and add the connections with the DIR, STEP of the GPIO PI3. Add the connection to your power supply for the stepper motor, link the pin RESET/SLEEP together to the 5V. You don't need to use end-stop switch, and to use the enable pin for the test : you cand disable it in the nanodlp setup machine to the simplify the test.
- Then calculate the voltage that you need by adjusting the potentiometer on the DRV8825 board, to limit the current in each coil
- At this step, you should be able to drive your stepper motor in the two direction by using the GUI Nanodlp
if it always doesn't work, then may be you can try with another stepper motor ?
Good luck in your tests !

Hi All,
I have a problem with Direct control, my printer work nicly with nanodlp 2018 yesterday I upsate Nanodlp to last version but now it dosent work  correctly for example when I press star print , plate want going to 0position but Among travel that going to zero position print start and downing wait for curing for layer1 (for example in 40mm)and after finish curing layer1 Continues to going 0 position and when arrive to 0 positon for all layer plate going up and then comeback to 0position (position not chang to next layer positin)
for start print Gcode I wirte G90 G28 [[SetPosition 0]]
and for Gocode befor eachLayer and Gcode After each Layer i copy setting from nanodlp help.

if possible pls help me, i have problem with new version

BestRegards
EMojiri

Hi dear Shahin
Thank you very much for your reply dear,
if i remove the Gcode for example i remove StartPrint Gcode When I press Start Print plate dosen't come to home position and If in any position ,It works there. not change position and not move up and down just shuter open and close z axis not work

yes I am sure, but i think i should setup it once again because some GPIO pin dose not work corctly , I think when I update Nanodlp some configration set to defult , but Z axis work corctly and endstops too but i set motor angle to 1.8 degree and micro step set 8 but my ballscrew step is 5mm in every rotate and for ladscrew i should wirte 2.5mm for every rotate and travel 5mm per rotate with this value(2.5mm) set with my ballscrew corctly .
thank you dear shahin

I still believe it is gcode which messing up with the build platform position.

i installed windose version too but after config all configration in steup page I press submit but submit not working and all configration not saved and i try windows version on 3computer

Thank you dear Shahin
I wating for your news, my friend

Hi my friends
I test nanodlp with Raspberry pi3 B+ I dont have any problem with Direct control but old version of nanodlp do not have any problem.

Dear Shain how can I found and install Previous version?

Last edited by Elyas420 (2019-09-09 03:32:07)

I think new version have problem, because I install a old version, printer work correctly  but it do not have mask option ,but work correctly