Let's Make Robots!

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wrench_orange.png Your work in progress or a finished robot: Robot project
script_edit.png Write in your own blog: Blog entry
comments.png Discussions and questions: Forum topic
brick.png Show what you are making robots of: Component
lightbulb.png Help others with what you have learned: Tip or walk through
link.png Add a good web shop, a guide or a cool link: Web link
Apparently it's pinewood derby time at my mother's church again, so she bought a car kit for my son and I to build. After a bit of thought we decided on a 30's hot … Read more
recieves commands sent by a computer thru a USB port and executes commands .
Using a
hello all ! , im new here and this is one advanced creation of mine which im going to submit here and follow up on its development . Read more
Navigate around using Sharp IR
Using a
Based on Fritsl's design I'm working on my first robot. I built the robot and it works but the only problem is that my servo won't do anything. I copied and … Read more
Buzzes around by manual remote control
Using a
My very first encounter with electronics - a very simple manually controlled robot. The main brain controlling it is a Attiny2313 + a motor driver board based on … Read more
Add 10-bit incremental / absolute encoder feedback to your hobby servo.
Modified continuous-rotation servos are used extensively by roboticists due to their small form-factor, enclosed motor-gearbox, ease of mounting and … Read more
When I joined LMR I had just written my first picaxe program.The picaxe was easy to learn since I knew basic and the manuals gave you all the information you … Read more
Hi, This is my first post to this forum, maybe time to let you see my robotic project. Five months ago i planned to make a two wheeled balancing platform. I wanted … Read more
Write on the pavement at high speed!
Using a
Speed writter races around with a spring loaded piece of jumbo chalk writting words. Using a hacked "Rebound" RC car for the body and an Arduino Nano for the … Read more
Hi guys, this is my next robot. He is very easy. I control him with "radio control". He receives two servos modiefied for continuos rotation and one jockey … Read more
making Rover using Faulhaber 24V BLDC and ATxmega128/256. Wireless Communication using xbee. Main host CPU running windows 7 with custom developing application in … Read more
  This is my first completed robot hence the name JR-1.  I used 1/4 inch melamine for the body and bick pen sections and bolts for the risers. The motos are … Read more
Drives around blind at the moment
Using a
Well, here's the post about my first robot. It's not yet finished... so bear with me as I iron out all the bugs. I purchased an RC Jeep at Walgreen's (US drugstore) … Read more

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Recently collected


Recently, I have received a gift mDrawBot kit from  Makeblock. the mDrawBot kit has already&nbs… Read more
Walks down slopes using gravity, makes his owner smile.
Wobbly is a 3D-printed, gravity-powered, walking automaton. He basically walks down slopes. Read more
There are many ways to build a robot, from scratch a kit, a prebuilt system or combination of any of these methods. The path we will take here will be mostly from a … Read more
Hello all, This is my first robot with programming so I would be glad, if you gave me some tips if you find any issues in the code. My robot is based on an AT-AT … Read more
Made a simple robotic one finger piano plinker using two servos, Arduino Uno, some aluminum flashing and a fishing pole for the sliding rails. You get a gold star … Read more
A study on PWM outputs at Tiva C Series TM4C123G Launchpad Evaluation Kit (EK-TM4C123GXL)
After some months form Read more

Problem with HC-SR04 distance sensors

Hi Everyone,

I have been finding that I get erratic distance measurements on my tests with the HC-SR04 sensors. I put together a circuit with 128x64 OLED SSD1306 I2C display (Really like that module, by the way) connected on a breadboard to Arduino Nano v3.

The idea behind the circuit is:

Use the NewPing library to generate a distance measurement in centimeters.

Print the distance value to the screen, and keep on repeating.

As the sensor is moved around (8V lipo battery connected to Vin and Ground) you can see the distance updated on the tiny screen.

Help with power circuitry

Ok so followng the advice in this thread and from these forums I have now bought a 7.4v and an 11.1v Turnigy LiPo rechargeable batteries (different voltages to be used in different applications).