Anybody wants a stepper motor analyzer?
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@zapta one Idea would be to integrate the RP2040 directly. Will Look Into that Option If i have any time
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Hello everyone.
Just a quick update. I finally got time to build a couple of the analyzers. I will go in tonight and do some testing. Once I'm done I will have a couple available. Send me a message and let me know if you're interested.
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@pcr, yes, using rp2040 directly would be a good move forward, considering that JLCP now carries it as a standard SMD service part.
Dustin Watts, the designer of ESP32 Tochdown (which which I copied the form factor and TFT model) mentioned recently doing something similar to his product and may have schematics to share (he is available on his Discord channel and is very open source friendly).
https://www.tindie.com/products/dustinwattsnl/esp32-touchdown/
Another good move would be to switch to a current sensor that JLCPCB carries (I found an allegro +/-5A with 5V supply and lower bandwidth one that may fit with some adaptations). Or, placing the SMD service order with PCBWAY which has access to more parts (Dustin Watt order from them and they also sponsor his YT channel)
@Th0mpy , that's awesome.
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I have some sensors from the legacy one left. So i will build some of the pico ones.
Anyone wants one in europe
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I'm working on battery powered one. Consumtion is 220mAh so around 2H autonomy. Charge and use as the same time when USB plugged. Small Housing redesign, 1mm thicker.
Still waiting sensors from china (hard to find them in europe!) -
The current sensors that used to cost $1.39 each are now $6.12, from the same vendor, due to the global semiconductor shortage.
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A side note, if you want to make a stepper extension cable or need for any other reason connectors that mate with the Duet's 4 pin kk connectors, these DigiKey part numbers seems to fit
WM13471-ND ; housing
WM2330CT-ND ; pins
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@zapta
The current sensors are £3.35 each, if you buy ten, from the same supplier via this site:
https://gbr.grandado.com/products/10pcs-lot-acs70331eolctr-2p5b3-acs70331-a70331-70331-sop-8-ic-chip-original?gclid=Cj0KCQjwtrSLBhCLARIsACh6Rmi87C-4ieahOuPrFe5HqIFy459C3PG6qSX53DwHaApaXtR0o5t1YjEaAsZZEALw_wcB&variant=UHJvZHVjdFZhcmlhbnQ6MjUzMzY3MTI3I've just ordered five PCBs and ten sensors; I'll probably build two units myself so if anyone in the UK wants a board or sensors (at cost) let me know.
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@rjenkinsgb, that looks as a good price considering the current shortage.
Please be aware that there are fake allegro ICs on the market. If you buy through Aliexpress they will give you a refund if you got faked. The signs of faked current sensors are
- Pins 1,2 are not shorted.
- Pins 2,4 are not shorted.
- The face is sanded (below the new marking) and the pin 1 dimple is shallow or non visible.
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@th0mpy definitely interested.
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Someone have 2X spares ACS70331 to sell in europe ?, can't find them. Thanks
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Well, JLC are on excellent form as usual - the five PCBs arrived yesterday.
The current sensors have been despatched, but I don't have a delivery date yet.
I will post an update when they arrive.
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Dear zapta, this is lb (deleted my account a few month back because of private/personal issues) but suddenly I recieved "my" stepper-analyzer (tried to cancel my order last minute before deleting my account in a private chat with you, but maybe it got also deleted when I deleted my account and you never had a chance to read the chat-message?). I bought an amazon gift card at a local shop here, and now would like to send all info related to it in a private message: But since this account is brand-new just for this purpose, I do not have enough rights/priviliges to start a private chat with you... Could you open a chat so I can send you the photos of the card with serial and bill and all of that? (Sorry to cause you so much trouble, I should have waited for a reply in the private chat for the cancelling of the order before deleting my account, so it is my fault. The stepper analyzer actually looks pretty cool! Congrats!)
Best regards
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@lbtqsb, just sent you a direct message here. Hopefully the system will allow you to reply.
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@zapta I'm late to the party and only came here, because you mentioned using the Pico state machine for the display.
What are the limits of screen size, colour depth? Which (TFT,HDMI?) screen do you recommend?//edit I scrolled through the thread and github pages, but I'm more confused than before: I found different names for the TFT: ER-TFTM35-6 ? What's the order number for a bare TFT with touchpad (without breakout board)
@pcr @zapta I'd consider this board as a CAN-Hat candicate. Add Can FD chips instead of current sensors (or add both?) as a CAN-analyzer...
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@o_lampe , the stepper analyzer uses a 3.5” 320x480, IL9488, capacitive touch FT6206 TFT display. The older design (legacy) used a PCB based unit buydisplay.com and the newer one uses a bare TFT module from AliExpress ('3.5 LCD CTP' option at https://www.aliexpress.com/item/32862869103.html).
For your design, a couple of questions about the requirements
- What is the desired display size and resolution?
- Is it a quick one-of or will it be produced in larger quantities (design effort vs unit price sensitivity).
- What is the nature of the display update? E.g. text fields N times per second, rolling graphs, videos, etc. This may affect the choice of the display interface.
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@zapta said in Anybody wants a stepper motor analyzer?:
For your design, a couple of questions about the requirements
What is the desired display size and resolution?
Is it a quick one-of or will it be produced in larger quantities (design effort vs unit price sensitivity).
What is the nature of the display update? E.g. text fields N times per second, rolling graphs, videos, etc. This may affect the choice of the display interface.Thanks for the detailed TFT info.
There is no specific project behind my question, only the general idea of cobbling a RPi Zero, CAN-FD and a display together as CAN sniffer/analyzer or panelDue replacement. The touchpad could also work as macro-trigger buttons or CAD-pendant.
Our imagination is the limit!
