Mecanum Wheel Robot Car & ESP-NOW Remote

@codecage No, I missed explaining it in the video! Oops!

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I'll update the article, but essentially you do need to modify the User_Setup.h file to select the TTGO T-Display instead of the generic one, which is selected by default. The procedure is exactly the same as it was for the round displays I used in an earlier video, except you select a different display and don't need to change anything else.

Make sure you have the latest version of the library, as earlier ones didn't include the TTGO display. 

Later today, I'll update the article to add more detailed instructions. Thanks for bringing it to my attention Steve!

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Bill

What board did you select for the TTGO board in the Arduino IDE?

@alanl I selected the ESP32 Dev Kit board.

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Bill

@dronebot-workshop This might be the time to ask if a sub forum called ERRATA and an ANNOUNCEMENTS sub forum. I have helped fix several folks projects that were caused by out of date libraries and/or links. Announcements for new versions of IDE and in this era where you can buy a Pi or other parts in short supply.

@dronebot-workshop

Posted by: @dronebot-workshop

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Make sure you have the latest version of the library, as earlier ones didn't include the TTGO display. 

I have version 2.4.79 of the TFT-eSPI library by Bodmer.  Is that the latest neeed?

@codecage Yes, I believe that it is the latest version, and it is the one I used.

Here is what you need to do:

1. Navigate to the TFT_eSPI folder in your libraries folder (which usually lives under your Arduino folder).
2. Look for User_Setup_Select.h and open it with a text editor.
3. Comment out line 30, which reads #include <User_Setup.h>
4. Uncomment line 61, which reads #include  <User_Setups/Setup25_TTGO_T_Display.h>
5. Save the file.

That should do the trick!

The older version of the library doesn't have the TTGO entry, which is why you need the newer one.

I will update the article to add these instructions and will leave a pinned comment on the YouTube video linking to it.

😎

Bill

@dronebot-workshop 

Thanks, have it updated.  My Mecanum wheel vehicle is coming from AliExpress and should be here in time to put it under the tree.  The TTGO-T-Display should arrive tomorrow.  Just don't have any idea about the NeoPixel LEDS.

I ordered mine from the PiHut - https://thepihut.com/products/neopixel-diffused-8mm-through-hole-led-5-pack  

but they only heave 7 packs left.

Well, much as I really detest Mouser (right now I positively HATE Mouser) they do have them in stock.

https://www.mouser.com/ProductDetail/Adafruit/1734

Ironically, I can also get them at several Canadian sources, including Abra where I bought the robot chassis. In fact, even Walmart Canada has them!  Strange, as normally it's us Canadians who can't get the parts.

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Bill

@dronebot-workshop 

The JST connector on the TTGO module is just a 3.7v input from a LiPo battery?  So if size is not an issue a single 18650 would do the trick?

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@dronebot-workshop 

Or is the needed recharge current for a 18650 an issue?

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@codecage Actually an 18650 would be perfect, I suspect that that's exactly what it is made for. As I mentioned in the video, it has a charging current of 500ma, so you'll need a battery with a capacity of at least 800mah.

I did try it with a 500mah battery and while it worked, it also caused the corner of the board (where the charging circuitry is) to get very warm. I replaced it with a 800mah battery, and it runs cooler now.

😎

Bill

@dronebot-workshop 

And the battery gets charged when the USB port is plugged in.  I would guess you need to make sure the "power" switch is turned on if one was included in your build of the remote.

Hi Bill. This is a wonderful build. I noticed at the 41:30-minute mark in your video explaining this project you show several filter capacitors (5 of them). Two of them are across the motor voltage line. Another capacitor is across the motor voltage near the power input.
The last two are across the 5 V line (I’m assuming those are for the logic level converter and the ESP32 itself). Could you perhaps tell me the values you used for the capacitors? They look fairly hefty.  Thank you.

https://1drv.ms/u/s!AkrFLMEDRgR6gsAzDaC5fQxZZecIdA?e=7renKj  

I had the PCB's made by JLCPCB and 3D printed the Remote case.

I have the Gerber files if anyone is intrested.