Difference between revisions of "Building the Mower"

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Revision as of 17:57, 30 May 2022

Welcome to the OpenMower Building guide!

Note: This WIKI was only just started on 2022-04-22, but are actively working on filling it up and making a good documentation for the new builders out there!

Warning

Please note that this project currently is in a very early stage! So don't go buying stuff right away! You will need to order and solder your own boards, since there are no assembled boards for sale yet.

Please make sure that you're actually allowed to build this device in your area. There may be laws / patents prohibiting you of doing so!

Please just be responsible and if you're not sure what you're doing, please don't do anything.

BTW the warranty of your brand new mower will obviously be void as soon as you modify it in any way, so be aware.

Intro

Below you can find an overview of the major parts and components in the OpenMower.

There is a also another page with a Builder Road Map that gives guide to how to go about building your own OpenMower project.

Bill OF Materials

Open Mower Bill of Materials
Name Description Optional Availability Quantity Required Source Link 1 Alternate Source
Mower (Yardforce Classic 500) Base building block Off the shelf 1 https://amzn.to/3NWgIxk Note: Earlier, we had a reference to myrobotcenter. However, they have gone into reconstruction, so be aware of that vendor!
OpenMower Mainboard The core of the new electronics. Custom 1 Components Octopart BOM:

https://octopart.com/bom-tool/ODFKeG8J

WIP
xESC Motor drivers Custom 3 Components Octoparts BOM:

- RP2040 no CAN version:

https://octopart.com/bom-tool/p1aqUopq

-RP2040 full:

WIP

- STM32 :

WIP

WIP
Raspebrry Pi 4 The brain of the robot. Also used to send RTK correction data from the base station.


For the base station the Raspberry Pi can be any model with Ethernet and USB, for the robot we need the Raspberry Pi 4 with at least 4 GB of RAM.

Off the shelf 2 WIP WIP
Ardusimple RTK2B GPS Positioning system for the bot Off the shelf 2 https://www.ardusimple.com/product/simplertk2b-basic-starter-kit-ip65/ https://www.ardusimple.com/product/simplertk2b-basic-starter-kit-ip65/
Raspberry Pi Pico Microcontroller talking to peripherals, soldered to the OpenMower mainboard Off the shelf 1 Widely available
MPU 9250 9-axis accelerometer sitting on Mainboard allowing for direction through compass and dead reckoning of movement between GPS updates. Off the shelf 1 You may need to shop around, corresponds to this one https://de.aliexpress.com/item/1005003718272772.html
3D printed brackets To hold the GPS inside the bot Custom 1 https://www.printables.com/fr/model/175826-openmower-gps-mount-for-yardforce-classic-500 WIP
SMA Angle Adapter Needed to connect the GPS without bending the wire too much Off the shelf 1 https://amzn.to/3K913b1 WIP
CC/CV Step Down module As charger for the docking station Off the shelf 1 https://amzn.to/3NUdRVL WIP
Docking Station Adapter PCB A PCB to hold the module in place. Custom 1 WIP WIP
GPS PCB A ground plane PCB to improve GPS reception Custom 1 WIP WIP
USB Angle Adapter If you want to use the Classic 500's USB port YES Off the shelf 1 https://amzn.to/3ukNAIj WIP


Building the bot

We are working on providing step by step instructions on how to build the bot. At the moment, we only have Clemens's video: https://www.youtube.com/watch?v=_bImqD-pQSA

Setup and test