R20, mail2code - Construction

The video about R20

About R20

Robot R20, mail2code, based on a Raspberry Pi and an ATmega2560

Figure 1:
With my project mail2code I would like to make it as easy as possible for you to enter the world of "Physical Computing". If you want to learn programming or are just curious how it works, here is the mail2code project page.
Rover R20 is the first mobile coding station. This robot is at home together with other mechanical colleagues in my RoboSpatium. This project is also free for you and accessible without registration.

Mechanics

Figure 2:
The mechanical components of R20 originate from a 3D printer. The construction is so compact that a print volume of 20x20x20cm is sufficient. All parts can be printed from PLA, or if higher temperature stability is required, from PET-G.

Figure 3:
About 540g of filament are required in the current stage of development.

Figure 4:
The assembly is quite simple. Here the finished rover from all angles.

Parts list:

When buying components via the affiliate partner links I have listed in the table (or through the banners on my pages) you help to keep my my projects going - many thanks!
Clicking on the links does not mean you have to buy - you can simply browse through the pages ;-)

Of course, supporting my freely accessible educational platform without shopping but by making a donation or becoming a Patreon also works. Many thanks to everyone who already sent me an obol!

Part	Online shop	Remarks
Raspberry Pi	Raspberry Pi on eBay.com Raspberry Pi on eBay UK Raspberry Pi 4 on Amazon	Central brain. Model 4 has sufficient computing power for desktop applications, but in principle the robot also works with the less powerful predecessor models.
Raspberry camera module	Raspberry camera on eBay.com Raspberry camera on eBay UK Raspberry camera module on Amazon	USB cameras work, too, but the Raspberry camera offers a lot more software features.
Powerbank	Powerbanks on eBay.com Powerbanks on eBay UK Powerbank on Amazon	Two outputs needed, one for the Raspberry Pi and the second for the servos.
Standard Servo	Standard servo on eBay.com Standard servo on eBay UK RC servo on Amazon	Camera servo
Servos for continuous rotation	360 degree Servos on eBay UK 360 degree Servos on eBay UK 360 degree servo on Amazon	2 pieces needed as drive motors. Note that standard size servos are required!
3mm nuts and bolts	30mm screws M3 on eBay.com Nuts M3 on eBay.com 30mm screws M3 on eBay UK Nuts M3 on eBay UK M3 screws on Amazon M3 nuts on Amazon	30mm thread length, cut the screws where they are too long.
Micro USB cable	USB cables on eBay.com USB cables on eBay UK USB cables on Amazon	Power supply of Raspberry Pi and servos. Shorter is better. If a Raspberry 4 is used, you'll need a USB cable type C!
Filament	Geekbuying.com ebay.de Amazon.de	PLA or PET-G filemant for better temperature stability
Resistors 1kΩ	Resistors on eBay.com Resistors on eBay.co.uk Resistors on Amazon com Resistors on Amazon uk
LEDs	LED assortments on eBay.com LED assortments on eBay.co.uk LEDs on Amazon com LEDs on Amazon uk	5mm diameter, white
Prototyping board	Prototype boards on eBay.com Prototype boards on eBay.co.uk Prototype boards on Amazon com Prototype boards on Amazon uk

Electronics

Figure 5:
Circuit diagram

Software / Download

The schematic and 3D files are included in the download package. The software isn't really finished yet. How it works in principle can be found on the mail2code website.

Test drives

Have a look at my RoboSpatium to see what robots are currently available for a test drive. Have fun!

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