Let's Make Robots!

A question about hooking up 2 LDRs to 1 picaxe input.

Hey everybody. I am a long time lurker on this site and I would like to thank you all for all the valuable information here. I have built a start here bot and a few more complex things of my own. Now I am trying to build a very small sized robot with a picaxe 08m.

I am a beginner in electronics. I know how to hook up a LDR and read the input, but I would like to know if there is a possibilty to hook up 2 to 1 input. The problem is I am short 1 input on my robot and all the other picaxe pins are in use. The 2 ldrs would be used as left and right eyes in a sense.

Going to build a YDM!

'Going to build a YDM'

Bit ambitious as a first project, but I have 'some' background in programing.

Right now I am a student at University of Idaho. I am taking C++ and attend the ACM meetings. ACM is a group on campus that does programing challenges and is now dabling in robotics. They recently got an Arduino board, and it is my understanding that it uses C++.

This will be my first robot, except for a semester in high school where I programed a robot to navigate a maze using only a sequence of commands.

The wild world of Robots!

Amusing infographic on robots...

Converting a PIC program, to arduino C

Hi, i found this code on the net, but i need it in arduino C, i have no knowledge on it, and no idea where to start translating...

there is also this one, in basicstamp i presume...



DarwinBot lives

This continues my previous experiments with evolutionary code generation. I built the simplest robot imaginable to test out pieces of code. This is 1069-H1 aka "DarwinBot".

Simple electronics videos

Hope these videos might be of help to somebody beginning electronics, schematics(electronic diagrams) will be coming soon for each video.

For the Turnigy TG9e servo used within the video below I used the following code to test it, using pulses with a picaxe 8M.


symbol i=b0

pause 100



for i=0 to 100

pulsout 2,75

pause 2

Does LMR need a good prototype board?

Im thinking with all the things we make, a lot of times on a prototype board or some perf board, we at least deserve a good one that we agree has the layout we want. I think something we designed might be more useful than something like this http://www.mcmelectronics.com/product/21-4580&CAWELAID=220241321 or these http://www.sparkfun.com/commerce/categories.php?c=149 . Not to mention i prefer proper PCBs with traces and a solder mask instead of the exposed copper.


how do i read a schematic?????

Mr. General sensor issue.

After getting the kit together, Mr.General just wont do as supposed! When looking throu a camera only two of the infrared sensors led up? I have had a electrician look at my soldering and he could not find anything wrong.

When turning it on all green led's shine brigthly, but after a few seconds it starts buzzing from the speaker and the green led's starts blinking with the buzzing. If i then touch the wiring on the breadboard the head starts to tweak, and sometimes the green led's get solid again. Have also tried to change all the wires. Still the same!??

Please help!

Robotic Arm Control

I have built a robotic arm. You can see it in the robot section. It is called IPTUPED.

Now that it is built i can only prgram it to pick up something that is in the same time. I need a new control method.

Due to the fact that i am pretty new to this i need some ideas. Basically i am asking you guys if you can help me find a good method. I have seen wii and arduino, nd rc. I need a good tutorial online somewhere that can help me control it. So far i have only been able to find a method that can control 2 servos. I am using 4 and maybe 5 in the future. Thanks for any help.

Coaxial helis

I sorta got into "flying" robots recently and I have found answers concerning most of my questions, but there is a particular thing I don't understand about helicopters; how do the coaxial system work (I mean, how can I make one from scratch). I understand that each rotor cancels the other's torque, but how does all this mechanicaly work? Are the rotors dependant on each other for speed (I suppose that's not true because the heli turns probably by increasing torque generated by one rotor and decreasing torque on the other).

Dual Cell Lipo Charging IC

Hey guys,

Can anyone suggest an IC that could be used to charge dual cell Lipo batteries (7.4V) with cell balancing? Ideally the IC would be powerful enough that it could charge even if the system is under a light load. I am looking for something similar to
the MAX 1555 IC (http://www.sparkfun.com/products/674) but for multiple cells. My google search has been fruitless - I must be using the wrong keywords. Thanks for any help!


This might be a well known site and tutorial, but I just stumbled across it and would point out that this is an amazing site for anyone interested in Arduino.
The tutorials are well written and packed with examples and information.
So if you’re starting up with Arduino or a more advanced user, this is the link to add to your favorites!


Dagu 4 channel motor driver fried


I have fried my 4 channel motor driver and don't know how this can happpen. As you can see in the picture the Dual FET IC  U10 for motor 4 is blown away. This happened during a first test of my IOIO-SHR v2 robot. Before connecting the motor driver the program has been tested with an oscilloscope, all Outputs are working as expected. All connections has been double checked. Power supply testet with an voltmeter. Each PWM pin can be controlled from the Android phone with a Slider of my test app. PWM frequency was 1kHz.