Let's Make Robots!

Auto Navigating Intelligent Arduino Robot

Navigate around, while avoiding objects

UPDATE 7: I'm still busy with making a good chassis. Soon I will update this page with new photos and a video of my robot in action.

UPDATE 6: I'm not going to contact Technobotsonline.com, I think that I have a good solution for the problem. Because problaby the voltage that the 2 NiMH AAs give isn't high enough. The motors that come with the Twin Motor Gearbox Kit problably work good with a voltage of 1.5V - 4.5V. The NiMH AAs give 2.4V together. But there is ~1V lost in the H-Bride / Motordriver. 2.4V - 1V = only 1.4V. Plus the motors have to work harder because of the transmission. But the gearbox works well when I just connect the leads of the motors to the 2 AA batteryholder by hand(without the H-Bridge, because the motors then really get their 2.4V). So I problaby  going to order a NiMH 3.6V batterypack with 3 cells and 2200 mAH capacity and a NiMH batterypack charger. 3.6V - ~1V = ~2.6 V, which I hope is enough Volts for my motors.


P.S. : When I finally get those motors working well I'm going to design the chassis. Then I'm going to post some new pics from my new chassis with the Arduino and other electronics mounted. Then I'm also going to post a video. After all that' s done I'm going to connect my SR05 and redesign the code. Then I can begin with extra features, like automatically turned on LEDs when it' s dark and a lot more!

UPDATE 5: It isn't the motorchip which doesn't gives enough power, it' s the gearbox which is causing problems. Some times the gears block and at startup one side of the gearbox won't run. I'n considering contacting Technobots for a replacement. And if they don't want to replace the gearbox I'm problably going to make my own gearbox with the axles and gears from the Twin Motor Gearbox kit!

UPDATE 4: Today I ordered a new motordriver IC because my old L293D probably can't handle the current that my motors draw. L293Ds can't handle more then 0.6 A (600 mA) current per channel continuous you know. The SN754410 from TI I ordered can handle the double current! And is cheaper. I also ordered some IR Emitters and Receivers because I'm going to make a remote control interface for my robot. Then I can control him like a RC car and let it' s LEDs blink. Maybe I will add control with the computer later on. With a bluetooth module and camera on the bot. But that will be more advanced. 

I'm not going to use my Meccano chassis anymore my Twin Motor Gearbox and Ballcaster can't me mounted properly on it. Instead I will make a custom chassis of some aluminium. When my aluminium chassis is finished I will add some pics and replace the old Meccano chassis ones. :)

UPDATE 3: Today builded my Twin Motor Gearbox Kit and wired up my L293D for some motorcontrol testing! Now I have to make the chassis, get the SRF05 Ultrasonic Sensor working and then program the full robot program! Tomorrow I'm going to try to connect the SRF05 sensor and then program the full code.

UPDATE 2: Yesterday I received my order from Technobotsonline.com. Soon I will show you my full featured working Arduino Robot. But I still have  a lot of work to do. Build the Twin Motor Gearbox Kit, connect the L293D to the Arduino, get my SRF05 working with my Arduino and solder a lot of components. Then I'll have to write the code.

UPDATE 1: Today I ordered the final order for my robot at Technobotsonline.com . So soon I will be able to show my complete robot here. A video will be added when it' s avaible! 

P.S. : My robot will not be using a Sharp IR, but a Devantech SRF05 Ultrasonic sensor. Because I can't get the Sharp IR sensor working. It lets my whole Arduino 'crash'/freeze. I still don't know the problem. 

This is my Arduino Robot so far. I'm still waiting on the Gearboxes and Motordriver IC. I build a chassis of Meccano. My robot will have a Security Mode with a PIR Motion Sensor. It will also have a LDR and some LEDs onboard. If the LDR detects that it is dark the LEDs will automatically turn on. I'm also planning to add my DFrobot LCD keypadshield later on. My robot will have a classic toggle switch as on/off switch. See pictures below.





A video will be added later on when I got my robot really working!









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Make sure you shield your electronics from the Meccano platform properly... I ran into some really strange problems with my robot. EMF noise from the motors made it do all sorts of strange things, and since the motor controller was mounted directly on the meccano, the meccano picked up the EMF noise and acted as an antenna and sent it right in to the L239D who just performed really weird :)

Yes, imagine when you just mount the Arduino on the Meccano and turn it on. For example the solderjoints of the Vin, 5V and GND pins will be connected to each other! That will short circuit your Arduino in a few seconds! Maybe you can see on the pics I placed the Arduino on a piece of paper.


Kind Regards,



Yes, that is a problem too, but the metalchassies will act as an antenna for electromagnetic disturbances, so try to separate any electronic you use from the Meccano chassis. I mounted my motorcontroller on a piece of plexiglass and like a struck of magic it stopped doing things like going backwards although there weren't any code for it to drive backwards :)

Don't get me wrong, but I recommend you show us work you have done not work you maybe will do in the future.

Agree~ I don't see any points to post this one.

I find that a plastic of plexi glass chassis is always better tan a metal one anyway, it much easier to work with and to mount sensors to in some occasions.

I am thinking about to use the too in one of my projects but not sure about the weight. Since it's habe of iron (it's probably not steel ;-) ) it will have a big impact on the total weight.