Let's Make Robots!

Arduino

Guangzhou Science Center robot competition

As an advisor to the Guangzhou Science Center I occasionally have to go there and do some work. This time I was one of their judges for a local robot competition. There were 2 categories, non-programmable robots for younger students and programmable robots for older students. All teams received a sheet of 2mm thick heavy duty cardboard for their chassis and a kit from DAGU that included:

This is an idea I wanted to try for a while. Basically, it uses one servo to drive the main wheel and a connected (90 degree) servo to turn that servo for steering. … Read more

Just a quick question regarding battery use on a hack RC car.

Would it be a bad idea to power my robot with one battery. I would be using 5 rechargerable batteries which will give me 6-7volts or should I just power my atmega328 and maybe ultrasonic ping sensor with a 9volt batteries and the rest with the rechargerable.

Standalone atmega328

1 dc motor with L293D

1 micro servo

1 ultrasonic ping sensor

6 leds (3 sets each)

Issue with L293D

For some reason I can't get my H-bridge to turn my motor both direction. It was working a week ago when I was working on it. When I turn Input 1 High and Input 2 low it will turn the motor forward but when I turn Input 1 Low and Input 2 High and doesn't do anything. Well actually I can feel like a buzzing sound like its trying to work. I am powering the H-Bridge with it own power supply on pin 8 (Vs). Maybe something I'm missing.  I will tried adding some capacitor in to see if that help any.

navigates via ultrasound, controlled by wii nun chuck
Using a
This is a robot that can be controlled by a wii nunchuck, or it can navigate on its own. It avoids cliffs with the ultrasonic sensor on the front arm, and it avoids … Read more

Using Sabertooth 2x12 with motor and servo.

 

I have an RC car that i've stripped down to it's bare essentials.  It has one motor that provides forward/backward movement and it has a servo that turns the front wheels left/right.   I can use the Sabertooth 2x12 fine with the motor.  The problem is however the servo. 

Make sure that trains don't crash into each other and stop at stations
I've built a huge Lego train layout which is fully automated by a few Arduino's. The passenger trains ride around and after a while they stop at the station. The … Read more

How many times , i can upload sketch to a arduino device.? what is differnce between UNO & NANO

How many times , i can upload sketch to a arduino device.? what is differnce between UNO & NANO

Banana Robotics Grand Opening

Hello,

Our family has been tinkering around with robots for more than a decade and we decided it was time to share our experience and enthusiasm by starting Banana Robotics.

I added the Arduino Sketch to the attachements, feel free to download and use it. Please let me know if you have some suggestions! Read more
Line following
Using a
So after some help from here and pololu I managed to come up with this little freak :D It gets his kP and kD values from BT from phone so I don't have to reprogram … Read more
Much like the dummy in Iron Man he will be my little helper, recording my videos for me.  Read more

Doodle bot not connecting

I recently purchased the DAGU kit for the Doodle bot. I set it all up as per the instructions and uploaded the sample text. I am a beginner and was hoping to use this simple kit to learn the basics of how all the components work and are programmed. Originally I was unable to get the robot to work properly, the right motor would spin continuously and the left was not responding (I checked, both motors were fine though).

 

However, now I am unable to upload the sketch to the controller. I get the following error:

 

 

Evaluates Ambient Incident Temperatures in Anticipation of Use for Human Finding Robot
In summary, this is relevant to my Serv-O robot project as a means of locating humans via non-contact temperature sensing. I finally gave up on trying to hack the … Read more

Advanced Robot Arm Project

This is a long term project to develop a robotic arm that is more advanced that traditional hobbyist arms using RC servos without being so expensive that only well funded universities can afford it. 

The first prototype gripper used standard RC servos while we experimented with the configuration as shown in the first video. Once I had a good gripper configuration I built a prototype arm for it as shown in the second video. This arm used a differential drive system with the goal being to keep the weight of the motors as close to the shoulder as possible.

Learns from Listening and Asking Questions, Tracks Colors and Heat, 6 Web Services, Database of Learned Knowledge
Using a
10/20/14 Update - It's all about Wolfram Alpha Read more
This tutorial shows you How to get the RSSI of an Xbee using Arduino!
It took so much time to get this working. But know everything works fine. Using RSSI you can make many funny projects, like object detection and so on. Check out … Read more
Navigate around via ultrasound
Using a
So I have had this little guy for quite some time now and have reached the point where I need to pull his guts out and use them in another project. However before … Read more
Once a CD Drive, now a scanner
I created this scanner after working with it, either directly or indirectly (I mean I had to learn how to use Stepper motors, program in the Processing software, … Read more
Robot for some airsoft senario like demining
Using a
Hello, After 3 years of trying into control amp eater motor cc ccw i have finaly reach my goal (after some fails) Here my project for an remote operated robot that … Read more
I’m often thinking if it is possible to make Art with Arduino. Arduino is a machine, a little computer made with electronic circuits. It hasn’t a soul. Can an … Read more
Hi there,  TechWeekEurope are running a competition which I helped create and I would like to invite the "Let's Make Robots" community to take part.  It's office … Read more

Interfacing from PC to Arduino via PWM radio

Greetings fellow LMRians,

I am in the planning stage of building a quadcopter, which will be my first ever flying robot. So excited!!!! I have a question for you all: how would I interface some sort of PC control to the machine?

You can glow LED in 512000 colours using keyboard keys
I created this software using Processing software. If the selector is set in red, then the software sends values from 0 to 79, depending upon how much brightness is … Read more
Announcing the winners!! I appologise to everyone for taking so long. It was just an unfortunate combination of Chinese holidays and lots of work. This was tough to … Read more
Navigate around
Using a
I made this robot at the begining last year, but never had the chance to share it. Someone asked about this robot, so I thought it might be nice to share it … Read more
Displays
After struggling for days with multiple designs, I have come up with something showable (I doubt this word exists). I have not included automatic movement here. I … Read more

question about arduino and supply current

hi guys, I just bought a ucam ttl jpeg camera for my arduino and have some very basic questions.

Reading the dataset it says that to power the camera it require 3.0V to 3.6V DC range nominal 3.3V. So I plug it into the 3.3V pin from my arduino mega, setted it up and it worked.

However, im a little confused about the specifications from the datasheet.Namely it says that

Supply Current (ICC) VCC =   3.3V    58(min) 62(typical) 76(max)   mA

But the current draw from the 3.3v pin, according to the website is only 50mA.