11000 réponses à ce sujet

[arkansar]

@Mike118 un robot on chenille c'est bien meut ? Que sur roue

[Mike118]

Ça dépend pour quoi. Il y a des avantages et des inconvénients. Un robot sur roue c'est déjà très bien.

[arkansar]

Ha je vois
Il faut avoir le driver ?

[Mike118]

You can use another driver if you already have one.

[firened]

@HyperS i can't find an exact figure, but it looks like the raspberry pi default output current is 8 mA per GPIO, with a combined output current of all GPIO together of no more than 50 mA.

A low power LED is often set to 20 mA. If it's just a "signal" then 5 mA can be enough, which would be possible to drive from the Pi without transistor.

But if you'd like to have actual light, then yeah, you'll need a driver.
How many LEDs and of what type?

Options are:
1) no soldering:
https://aliexpress.c...0298159107.html

https://aliexpress.c...0290163842.html
2) cheapest and very versatile: FET, For 3.3V good are N-CH FQP30N06L + P-CH NDP6020P + 10 kOhm resistors.
3) high power LED current driver:
https://aliexpress.c...0341086776.html
4) arduino relais
5) arduino driver boards
- the buzzer you sent looks good. (It must be an "active" buzzer for 5V or 3V)
- the LED you sent, what voltage and current do they need? Link?
The (2) second option would look like this. The "FAN" can be a motor, laser, lightbulb, amplifier, and some LEDs (only if they are already current limited. It depends on the product.)

[firened]

I found them. They look cool but will not be very bright. It has just normal [U+2205] 5 mm "superbright LED"s inside, they are usually 50 mA.

Check this out instead. It has COB LEDs, often they are brighter, but doesn't say how much. Pick one with a ServoPWM controlled LED driver.
https://aliexpress.c...5313017978.html

[firened]

Yes, any with "___ LEDController" should work

[firened]

@HyperS sometimes a bit of interference in the video happens

I have it too sometimes.
Things you can do:
- make sure the camera flex cable is not close to any other cable or electronics.
- does it only happen when driving? Some motors do not have a good EMI shield, it's a metal plate around the motor.
- you can use copper tape and put it on both sides of the camera flex cable, i did this on IcecreamTruck.
I see where this is going
(old meme)

[firened]

Yeah kitchen aluminum foil should work too

[firened]

Just beware

[firened]

Hm weird. Then i don't know. The shielding should work if it's electromagnetic interference.
Yes broken ribbon cables can do that too but your's isn't old yet

[firened]

I'd probably check the internet for popular rc crawler brands, then search second-hand platforms for those specific brands.

Or perhaps ask around in your friend- and relative-circles. At least here in Switzerland i think many people might have old rc cars they no longer need.
Also remember that there's no rush. Electronics is often not about reaching an end goal at all, but more about the journey, learning, soldering, breaking things and making mistakes.

[firened]

Another option is to build the platform from scratch using wood, motors, wheels, find part at a scrapyard and the like. It's a lot more work and the end product might not be fast or anything but could be fun and cheap as well

[Mike118]

I spend too much time on them and don't produce enough of them. x)

I am working on "industrialisation" to make them easier to build and solving issues ...
Nerf vigibot

20210318_170013.mp4   3,31 Mo

20240303_154059.mp4   1,61 Mo

20240303_215106.mp4   2,92 Mo

20240303_215130.mp4   4,71 Mo

20240303_214828.mp4   183,17 Ko

[french_storm972]

where is the 4X4 ?

[Mike118]

Which one ?

[french_storm972]

um the big 4X4
TRAXXA

[Mike118]

I only shared what I built. I never made a traxxas.

[french_storm972]

this car
is not my robot

[french_storm972]

is my robot