Let's Make Robots!

4 Axis Robotic Arm

Hello 
     I am a beginner in robotics and currently I am trying to build a 4 axis robotic arm with rotating base and I need Kinematics Equations for this project . Can anyone help me with this. 

2D model of my robotic arm is attached

Obstacle avoidance, distance measurement
This robot is not finished yet, So far it only has obstacle avoidance program. It's built from metal. It also uses Arduino Uno to control everything. Now I'm … Read more

RF Link query

I have been designing a RC remote control for my plane/tricopter. I have documented the project at LMR 

http://letsmakerobots.com/content/rc-remote-and-drone

Well,I have run into a problem. The NRF24L01+PA+LNA modules with SMA antenna I have been using so far has only been proved to give reliable connections upto 250m approx, but I want to make solid connections upto 600m atleast. Thus the NRF modules can't be used. I have some options here,either I will buy a radio from a online store, or I will plug in some RF link in my module. 

Aduino Uno with more beef

I have been quite frustrated using generic Arduino Uno boards with peripherals such as digital compass, IMU, and nrf24L01 radios. The problem usually manifests itself as not enough usable I/O pins, not enough power or ground pins, wrong sex on headers, an most importantly,insufficient 3.3V power. I have boards from Dagu & RFRobot that satisfy most of these issues but I need the Uno pin format to cleanly interface with the Dagu Scamper ComMotion shield.

Solution. Design my own board.

Navigate and avoid obstacles with ultrasound sensor. Can follow a line and reproduce sounds. You can handle it manually or create your own programs for it!
Once you have unboxed the mBot and mounted the fun can start!  Read more
Navigate and avoid obstacles with ultrasound sensor. Can follow a line and reproduce sounds. You can handle it manually or create your own programs for it!
So after unboxing the robot, we have to mount it. It's very easy and funny. All pieces you need are in the box kit (only 4 AA batteries are needed). It took me 20 … Read more
Navigate and avoid obstacles with ultrasound sensor. Can follow a line and reproduce sounds
Hi! This is the first part of my review on the mBot robot kit, designed and manufactured by Makeblock. It is an educational kit which comes with interesting sensors … Read more

Remote Weather Station

This is a work in progress weather station with wireless transmitting, it is made using cheap components, so here is a list of components all purchased off of ebay ecept for my trusty genuine arduino dumelnove, which will be replaced with a $4 uno clone off ebay in the final project. Still need to build enclosures for both the indoor and outdoor units. It is based on this instructable.

http://www.instructables.com/id/SOLAR-POWERED-ARDUINO-WEATHER-STATION/?ALLSTEPS

Transmitter

The Lion is attends his first public function in ZhuHai! My first attempt at a dancing Chinese lion was rushed and failed miserably. I did however learn a few … Read more
this is my first try to build a drawing machine.it is a very simple 3dof arm,including 3 standard servos(one for pen up/down) and a arduino uno.software is … Read more