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by HermannSW
Sun Dec 05, 2021 10:35 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

Building phase of Tinier2040bot. Motors are superglued together, with 19.7mm between wheel outsides. 401215 lipo has been superglued onto the motors already in panned orientation. Tinier2040 lies on reduced in size Pololu DRV8833 motor driver — they will be added on top of Tinier2040 base for smalle...
by HermannSW
Sun Dec 05, 2021 10:18 pm
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest Pico Robot?

20211205_220712.15%.jpg Pico4MLcbot is completed now (bottom row left, top row from left are Tiny2040bot, Picobot, Toycarbot). I found no way to put/get files via wireless RP2040 MicroPython REPL onto/from the board. But to my surprise ampy cannot only deal with serial and USB, but with telnet as w...
by HermannSW
Sat Dec 04, 2021 7:49 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

I was really lucky that I got side-tracked several times last week from rebuilding motor+wheel+motorcontroller block. Why? Today two 401215 60mAh lipos arrived via Ebay from the UK, really expensive with 7.72$/pc, and with even more shipping 34$ in total. But these lipos are really worth it from sma...
by HermannSW
Sat Dec 04, 2021 7:06 pm
Forum: Camera board
Topic: kickstarter "OpenCV AI Kit - Lite" (2xOV7251 + 1xIMX214)
Replies: 3
Views: 440

Re: kickstarter "OpenCV AI Kit - Lite" (2xOV7251 + 1xIMX214)

From kickstarter update #8: Auto-Focus -> Fixed Focus for Color Camera on OAK-D-Lite We're thinking we should change the OAK-D-Lite to use a fixed-focus color camera instead of an auto-focus camera. The `why` is that fixed focus allows use in high-vibration environment environments, with little loss...
by HermannSW
Sat Dec 04, 2021 4:16 pm
Forum: Camera board
Topic: We Made A 16MP Autofocus Camera Module for Raspberry Pi
Replies: 5
Views: 287

Re: We Made A 16MP Autofocus Camera Module for Raspberry Pi

I got a sample from Lee, see photo below. It is the very first of all cameras I ever received that came in enclosure case with cable already connectecd. All I had to do was to screw the enclosure backside onto tripod. Is this fully open source or does it require a closed source library/module? From ...
by HermannSW
Fri Dec 03, 2021 8:35 pm
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest Pico Robot?

Aducam has a camera with focus control. Is it used here? No, that camera is of the size of v1 and v2 camera modules. The 324×324 monochrome rolling shutter hm01b0 camera used in Pico4ML is tiny, I used online .stp file viewer to get the dimensions: https://www.uctronics.com/arducam-hm01b0-qvga-cmos...
by HermannSW
Fri Dec 03, 2021 7:58 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

I will build my Tinier2040bot this weekend, based on: 10x6mm motors from solar toy car 8mm diameter rubber wheels from toy car, superglued directly onto motor shaft reduced to 19.5×14.9mm Tinier2040 reduced to 19.1×12.7mm Pololu DRV8833 motor controller 4.5×10.5×15.9mm lipo I had tried to reduce DRV...
by HermannSW
Fri Dec 03, 2021 1:54 pm
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest Pico Robot?

Those tiny SPI 320x240 cameras and Pico look like it they can make it possible now at least in 1:87. If someone doesn't make a Pico/camera/motor driver PCB I might have to do one myself ;) My Pico4MLcbot from last posting is created on top of older Arducam Pico4ML module that has 324x324 camera, 16...
by HermannSW
Fri Dec 03, 2021 10:39 am
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

@bgolab Thanks, I did order as well: https://www.mouser.de/ProductDetail/Seeed-Studio/102991556?qs=sGAEpiMZZMuqBwn8WqcFUipNgoezRlc431cQRmz2t69ABayaL6w4QQ%3D%3D Sadly delivery time is 13 weeks. Product information says (28mm is a problem for "smallest robot"): https://www.mouser.de/new/seee...
by HermannSW
Fri Dec 03, 2021 12:47 am
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest Pico Robot?

Thanks for the Nanosumo link, but 1 cube inch is too big for what I want to get (perhaps 16mm side cube robot). Regarding the wheels, my current rubber wheels have contact on 2.8mm length to ground, which is important for fast turns or braking. Today I received new tiny lipos; I had one 401015 25mAh...
by HermannSW
Thu Dec 02, 2021 11:08 am
Forum: Beginners
Topic: is it possible to boot over wifi yet?
Replies: 26
Views: 863

Re: is it possible to boot over wifi yet?

One can connect these cheap ESP-01 programmers with ESP-01[⁠S] inserted into USB port: https://forums.raspberrypi.com/download/file.php?id=50920 If the module runs WifiToSerial.ino example, they can connect to home network directly on power up. I use the ESP-01 for wireless Pico MicroPython REPL wit...
by HermannSW
Thu Dec 02, 2021 12:52 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: IR Transmitter
Replies: 2
Views: 139

Re: IR Transmitter

As Joan said, leds have two inputs only. I use IR led connected to pins 37+39 (GPIO26+GND) for turning my Pi400 into a KVM switch (Keyboard+Video+Mouse). On the photo you can see how I soldered 100Ω resistor in line with the IR led: https://forums.raspberrypi.com/viewtopic.php?t=321840 https://forum...
by HermannSW
Thu Dec 02, 2021 12:11 am
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest Pico Robot?

I completed soldering of DRV8833 motor controller to Pico4MLcbot, many 0.2mm diameter wires: 20211202_004821.15%.jpg I flashed MicroPython and tested 1st motor connected via GP2 and GP3 pins. All fine, forward and backward, with PWM fast and slow. Next I tested 2nd motor, and that immediately turned...
by HermannSW
Wed Dec 01, 2021 8:42 pm
Forum: Raspberry Pi 400
Topic: Pi400 KVM switch
Replies: 8
Views: 885

Re: Pi400 KVM switch

I am working more than 10 hours with Pi400 every workday, and many hours on the weekends as well. 8 hours on workday for "work from home" on the laptop, and for personal Raspberry stuff on the Pi400. Sometimes pressing CTRL+RASPBERRY switches keyboard+mouse, but not the display. There were...
by HermannSW
Wed Dec 01, 2021 8:03 pm
Forum: MicroPython
Topic: Possible to run MicroPython on one core and C SDK code on the other?
Replies: 3
Views: 180

Possible to run MicroPython on one core and C SDK code on the other?

I know that MicroPython can utilize both cores, thanks to @hippy's simple example: https://forums.raspberrypi.com/viewtopic.php?f=146&t=308150&p=1844377#p1843844 Running MicroPython REPL without using "_thread.start_new_thread()" runs on Core0. Is it possible to run C SDK code on t...
by HermannSW
Wed Dec 01, 2021 5:41 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

Do you have access to a 3D printer? I was wondering if you could design and print a simple gear system for the motors to have them at 90 degrees to the wheels, so they would sit longways under the main boards and both wheels could be level rather than one behind the other. No need for 3D printer, s...
by HermannSW
Tue Nov 30, 2021 10:05 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

A short followup on WebREPL, after having done "import webrepl_setup" and configuring WebREPL, these are the files that were created on module's filesystem. They enable ESP-M2 wireless AP and WebREPL after each power on/reboot: WebREPL.after_setup.jpg I did dremel further on Pololu DRV8833...
by HermannSW
Mon Nov 29, 2021 11:30 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

TX cable broke, so I did remove RX cable as well. Then I powered ESP-M2 from Pi400 GND/3V3 — and got reboot of Pi400; likely the ESP-M2 module did draw too much current. But after reboot all is fine. Since stock ESP8266 MicroPython was flashed onto the module, MicroPython does not "know" t...
by HermannSW
Mon Nov 29, 2021 10:03 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

... But then, after unplugging and replugging without GND-GPIO0 connection I started "minicom -b 115200 -o -D /dev/ttyUSB0" and nothing happened. I tried all other baudrates listed here -- nothing works, all showed garbage: https://en.wikipedia.org/wiki/Serial_port#Settings Just wanted to...
by HermannSW
Mon Nov 29, 2021 12:48 am
Forum: Other RP2040 boards
Topic: Pimoroni Tiny 2040
Replies: 21
Views: 3086

Re: Pimoroni Tiny 2040

This hyper minimalist SBC could be about .5 mm narrower without [the castellated edges]. The 8 MB of flash is nice though! Not only 0.5mm — I needed smaller Tiny2040 and used my Dremel to reduce from 22.9×18.2mm to still functional 19.5×14.9mm Tinier2040: https://forums.raspberrypi.com/viewtopic.ph...
by HermannSW
Mon Nov 29, 2021 12:30 am
Forum: Other RP2040 boards
Topic: Arducam Pico4ML TinyML Dev Kit (new)
Replies: 1
Views: 136

Re: Arducam Pico4ML TinyML Dev Kit (new)

Ooops — the bigger model got a massive price drop from 54.99$ to only 30.99$, just 5$ more than the smaller model ...
https://www.uctronics.com/arducam-pico4 ... -more.html
by HermannSW
Mon Nov 29, 2021 12:21 am
Forum: Other RP2040 boards
Topic: RP2040-LCD-0.96
Replies: 8
Views: 370

Re: RP2040-LCD-0.96

For me the great combo board would be RP2040 + LCD + ESP8266;) All my three completed tiny robots have ESP8266 onboard: https://forums.raspberrypi.com/viewtopic.php?t=323194&start=25#p1941800 https://forums.raspberrypi.com/download/file.php?id=50796 From left Tiny2040bot, Picobot and Toycarbot....
by HermannSW
Sun Nov 28, 2021 5:58 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

I have superglued 2.5g 19.7×14×8mm (w×l×h) motor base for Tinier2040bot: (wires from both motors soldered together only for 1st demo below) 20211128_163334.15%.jpg I used Dremel to cut quarters of a 4.2mm diameter airsoft pistol pellets and superglued them to the non-wheel sides of the motors. There...
by HermannSW
Sat Nov 27, 2021 6:09 pm
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 31
Views: 1208

Re: Tinier2040

Could you reduce the height even further by removing the buttons and USB from the tiny2040? If they are still required, perhaps bring them out on thin wires? Wow, good idea, just measured with vernier caliper that this would reduce total height by 3.3mm ! One reason currently is, that there is no W...
by HermannSW
Sat Nov 27, 2021 5:19 pm
Forum: General
Topic: Smallest Pico Robot?
Replies: 50
Views: 3078

Re: Smallest ̶P̶i̶c̶o̶ RP2040 Robot?

I used Dremel as well to reduce Pimoroni Tiny2040 board from 22.9×18.2mm to 19.5×14.9mm(!), called this Tinier2040: https://forums.raspberrypi.com/viewtopic.php?t=324698 On this screenshot you see Tiny2040 powered by new very small 25mAh lipo, and in middle row middle position Tinier2040. The youtub...

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