Видео

i use normal printing paper for the bellows. the slide switch has to be more sturdy. I use paper that is about double the weight/thickness of normal printing paper for it

Yes, It will be available soon (maybe not so soon, but at some point :-))

Thanks! So cool you built one yourself!

I use the geared solar motor GM17 from solarbotics

please write me an e-mail and I see what i can do. You will find it at the bottom of my website: www.voltpaperscissors.com/

THANKS SIR BUT ITS OK I WILL MANAGE SOME HOW

butting velostat in-between the on/off switch makes it a pressure button but it will only dim the LED(s) connected to it. I do not see a simple way of achieving what you want to do since you bascially want to switch between three circuits using the same button (with different pressure). You can achieve it with a microcontroller an some simple programming (e.g. an Arduino).

the pcb is a prototype and currently not available for purchase. I hope to make it available soon. subscribe to get notified!

voltpaperscissors.com

no because it does not make any difference. just follow the steps to build the basic robot from this tutorial: ruclips.net/video/IAb0I2N7zag/видео.html then proceed with the smartphone robot tutorial. A new tutorial would be the same as doing it this way.

@@VoltPaperScissors thanks

I am using bluetooth for connecting the two phones. But bluetooth is not required for driving the robot. I use lightsensors to read light/dark values from the screen. The lightsensors switch transistors on/off to drive the motors

I just buy a buzzer. It should be rated vor something about 3Volts

It is this robot: ruclips.net/video/emfvzUJiMLw/видео.html

hi! sorry for my late reply!!! it is hard to tell. It can work I guess but no guarantee. you can start with the sample circuit and see how the circuit behaves. remember, it is important to have geared solar motors for this!

I use this robot to teach app programming. so there isnt any app, you have to make your own app using MIT App Inventor for example

A great project for App Inventor 👍

Thanks! Using a reed switch would also be a good option!

Thanks a lot for your great feedback! ❤

thanks!

thanks!!!

I am not the expert here but as far as I know it is like this. The leds need a slightly lower voltage than the batteries provide. You can often run them for a short time without but they will break depending on their color sooner or later. With the resistors they will last longer. Plus when you connect the leds to the power there will be a short voltage spike. together with the already heightened voltage this often kills the leds. the resistors help protect the leds by turning the extra voltage into heat, they have a higher tolerance for this kind of stress.

I'd say using LEDs with one button cell is fine but this project uses a stack of two, resulting in 6 Volts for 3-Volt LEDs. So we use the resistor to protect the LED (adjust the voltage over the LED). Also, this project is for older kids and they should learn how to do it right. And using a resistor with every LED is definitely the right way once you use a different power source. Button cells are designed to supply devices with only very little power over a very long timespan. Thats the main reason why they don't damage LEDs. Other power sources will damage LEDs fast if there is no resistor in place.

@@VoltPaperScissors thank you so much for the answer!

​@VoltPaperScissors sorry for maybe a stupid question, Ijustloveyourprojectsand try to understandthembetter. Why do you use 56 ohm resistors if you having 6V power source and 3V in parallel connected LEDs you need to achieve 3V of voltage drop with 150 Ohm, don't you? Do I miss something? And why do you actually need 6V for 3V LED if connecting in series doesn't influence the capacity?

These questions are very reasonable. 150 Ohm is probably the correct value (when calculated). I use a lower value because of the limitations of CR2032 cells. If you have a multimeter you can try yourself: Once you attach 4 LEDs (or even 1) to a button cell the voltage over the LEDs will start at 3V but drop quite quickly to something below 3V. Coin cells are not designt to supply components with "lots" of power over a longer period. I wanted the book to be as bright as possible so I decided to use 6 Volts. I found 56Ohm to be a good value because of the voltage drop that occurs once you draw power from the batteries. So the exact value does not really matter. You can use 150 Ohm as well if you want to teach students how to correctly calculate the vaule. The LEDs will be slightly dimmer but it will still work just fine. I even tried it with no resistor in place and none of my LEDs broke but doing it that way felt wrong. Using two coin cells in parrallel would also be an option and the voltage drop would not be as big since the power draw on each button cell would be lower. But LEDs would still be a little dimmer compared to my solution. Another disadvantage of this solution is that the required circuit needs more space and if a student attaches one of the batteries the wrong way it would be a direct short circuit between the two attached batteries. These are little details and there are multiple working solutions. In the end I decided to go with the 6V stack and a very small resistor. Thanks for asking. It was fun answering this as it illustrates how much thought went into designing this :-)

thanks peter!

thanks!

Freut mich sehr!

Thanks a lot! Ps. There is a new video out, just now :-)

Hi! thanks for you kind words. Lets see how my next video(s) perform. I was busy with other stuff but in the next weeks there should be a new video from me!