Bernard90

I am still wondering if it wouldn't be better and easier to build this device like a robot arm (as in the picture) compared to a printer type of build with 2 axis.What do you guys think? Is there a limitation to how many motors can be connected to to the 8 ports of 1 intelligent brick? I figured to buy 2 additional motors (5 in total) to also build a functionality to turn the phone on and off (by pressing the sideways on/off button and home button).

Thanks a lot, that will definitely help! Especially the building instructions are useful since several other plotter like examples did not have a building manual. Thanks dr_spock! That's very useful information. Looking at the need for a rechargeable battery it might be more interesting for me to buy the 45544 educational EV3 set instead of the 31313.

Thanks dr_spock! So I assume it is possible to build with Lego Mindstorms. 1 large servo motor for each axis and the medium servo motor for the stylus to go up and down, will hopefully do. I will probably need to buy an expansion pack to the 31313 set, since I'm afraid I will need quite a lot of gears (such as gear racks). Can I use the EV3 intelligent brick in such a way that it can stay on all day, and run the programmed sequence of steps in certain time intervals?

Thanks, indeed I am aware. Do you think that it will be possible to build this device with a EV3 set?

Hi everybody, I am new to Lego robotics and would like ask you if it's possible to build an idea I have, with a Lego Mindstorms EV3 set (+ additions if needed). Before I make a big Lego order, only to later realize it's not possible to build. I have the idea to build a test machine for a phone. It is basically an automatic device that can touch a phone screen on certain locations in a programmed sequence. Looking at other Lego mindstorms builds (could not find a similar build), I think this can be realized by building it like an XY-plotter with 2 axis (like a gear rack) and a motorized pointer/stylus that can go 1 step up and down. The concept is best explained with a YouTube video or see the attached picture. It does not need to have a camera functionality as shown in the video. I will use this device to test phone applications I am developing. The requirements it should meet are: - Touch the phone screen on programmed locations with a precision of +/- 5 mm. - Be able to do this in a sequence on certain time intervals, every hour it should repeat the same programmed steps, then stop and repeat every hour during the entire day. - Besides programming, the device should work independent of a computer/laptop. Will it be possible and relatively easy to build this (since I am new to Lego robotics)? If so, does a single EV3 set (e.g. 31313) be enough or do I need to buy additional sets? I will share of course the build after it's finished .