Bluetooth tank V2

Let's Make Robots Robots
1

UPDATE

After some research and tests I came up with driver setup.

I am going to use two L298N drivers with heatsink modification. Made some test drive and I am happy with result(it is so fast even in "low" gear :) compared with Tamiya gearbox), but I need to buy one more driver becouse second one is made by me for some testing, here is test drive photo. Will do video after eveything is more user friendly.

And conclusion is that L298N can drive one 12V drill motor with gearbox + tank weight or 4A load.

more photos 

https://picasaweb.google.com/106462055291066309187/September302012ArduinoBluetoothTankRobotNewChassisVersion

 

 

UPDATE

I have made new chassis frame and Tamiya gearbox changed with two 12v drill motors(makita 6270d). But as I expected 298N driver is too weak for those motors. When I turn pwm to full power I can hear only sound from motors (input is ~ 9v but output in each motor at that moment is ~ 0.8v - 1v).

Problem is that I dont know any characteristics about those motors. So I dont know what driver should I use.

 

 

new homemade tank chassis

 

 

Here is first version:

https://www.robotshop.com/letsmakerobots/node/33146

 

So after I have received Arduino Uno clone from dx.com, I decided to upgrade my Bluetooth tank = add speed control (pwm signals) and of-course use android device accelerometer to control tank direction and speed. After msp430 platform, Arduino is so easy to program. And here is results. First video is how it looks when using tablet to control :D, normally I use Desire S(much easier, Desire was used to make those videos, has better camera). In this video I think my samsung tablet is upside down :). Second video: shows climbing performance :D and super truper cover :DDD

  • Actuators / output devices: Tamiya 70097 Twin-Motor Gearbox Kit
  • Control method: Bluetooth via android device
  • CPU: Arduino UNO Rev 3
  • Power source: 8 x 1.2v Ni-MH
  • Target environment: Indor
This is a companion discussion topic for the original entry at https://community.robotshop.com/robots/show/bluetooth-tank-v2
2

Nice

That is a great design.  Especially the truck concept.  ; )

3

thanks

:slight_smile:

4

just found this one : Dual

just found this one : Dual MC33886 driver

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=221123999660&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en#ht_2779wt_1344

5A hmm, is this enough ?

5

You could always …

get a 12v power source, a multimeter, and attach the multimeter in between the power source and the motor to get a current reading. I would probably double the current reading that you get when the motor is just freewheeling to account for stall current.

6

With 9V I get start peak of

With 9V I get start peak of ~2.2A and ~1.25 A of free motor run.

with 12V I see peak on start ~ 5A and 1.5A free run.

Looks like 5A driver should be enough with 9V power ?

7

I will only say

I have no real world experience. My input is only based on what I have read. I will, however, agree that based on the numbers you acquired, a 5A driver should suffice.

8

success

in 298N dual channel driver I have made one channel setup(simple connected one motor on both channels) and motor spins like a charm :slight_smile:

12V free run reading is about 1.5A to 2A(~3.5A start peak). so in theory now my driver can handle one motor up to 4A.

After 5 min play with phone accelerometer heat sink was very very very hot. Guess I will need bigger heatsink.

9

Bealtiful. Great use of

Bealtiful. Great use of bicycle chains :smiley: