Let's Make Robots!

picaxe

Running a MicroController off a SuperCap

Because I keep daydreaming about wiring up my house with dozens of sensors, I was wondering how hard it would be to power a micro controller (say picaxe) off a super capacitor.

A supercap is an electrolytic capacitor with an insanely large capacitance. Mine is half a Farad, 470000 uF. But is rated for only 5.5 V. That's the deal with these caps. Higher capacity at the expense of the maximum voltage they can endure. Or simply at an expense. This one costs about $4 at DigiKey.

microcontroller choice

i have  a problem: i only have on uc, an arduino, and have to build a tx unit with some cheap ebay radio modules. does anyone have any suggestions as to a small microcontroller for this unit. it only needs 2 or 3 channels.

 

Serial Pins on AXE020

 

On the tutorial Picaxe for dummies Fritsl says the following:

Picaxe resetting or stuck in fatal loop

 

I'm reprogramming Robot Leader, and I'd like to be able to use PWM to pulse his LED eyes. The only problem is, I also have to command a servo to turn his head, and the Picaxe28x1 does not allow you to use PWM while you are using the servo command. They both rely on the same timer.

Suggestions for TheBox

Hi,

Lately, I've been creating computer vision applications for my robot TheBox

I've created a color tracker, a motion detector and a wall avoider application.

But now I ran out of ideas. 

 

So, can you give me some cool ideas to make other applications? :)

Picaxe code

Hi all,

I've been busy over the past few days studying the Picaxe manuals and trying to understand the coding. I keep reading about how easy it is and it's even called basic, but my problem is, I don't understand any of it.

My electrical and mechanical skills are enough to get me by, but this programming makes no sense to me what so ever.

I've Googled in an attemp to find online tutorials, that doesn't seem to help either.

Can anyone explain how they learned the Picaxe basic coding? That might help me.

Thanks,

The Bromz.

Picaxe, programming and peanuts

Hi brain boxes,

I'm a bit stuck at present. My problem is, I know nothing about programming. I don't know much about anything really, but programming is really low on my list of knowledgable subjects.

I'm trying to programe my picaxe chip and have no idea what I'm doing, I tried eating some peanuts, but even that didn't help. I still have no idea what I'm doing!

So, I thought someone may have stumbled across an online tutorial of somekind. If someone knows of such web page, if they could let me know and I'll give them a peanut.

Thanks fellers,

The Bromz.

Two I2C-slaves ==> i2cslave-command repeated?

Hi,

In the near future I'll have to control 2 MD03 motor controllers via I2C. Now, I don't get much about the i2c-commands integrated in PicAxe µC's so I'd like to ask how I should talk to them. Should I issue the i2cslave-command everytime I want to speak to one, or should I issue it twice (euch with another address) in the beginning of the program, or is there another way that I don't now about?

Thanks!

Well, this is probably the simplest robot I've ever made. It is just this event's robot mounted in a old IBM box. I've built it just to serve as a testing platform … Read more

Problems with I2C -- DISCARDED

I'm trying to control two motors  by means of a joystick. This means I've coupled the potentiometers inside the joystick to my Picaxe 28X1 and my Picaxe 28X1 to two MD03 motor controllers. 

While testing I'm using only one potentiometer and one MD03. The problem is that I cannot get the system to work.

The program I'm using right now is:

i2cslave %10110000, i2cfast,i2cbyte

main:

readadc 0,b0

Autonomously vacuum small debris and recharge
Using a
UPDATE: NEW VAC, CHASSIS, ETC. NO NEW VIDS :( The ever-popular autonomous, self-charging, vacuum robot. Inspired by the old OMNI magazines photovore, of all … Read more
navigates via ultrasound, "identifies" milkshake bottles and drives away from them
Using a
Following on from Djeff-209 MkI. In order to replace a slipping drive sprocket, I had to change the layout a bit. I also added the code for very limited object … Read more
Djeff-209 is my first robot, based on the LMR Start Here robot. I swapped out the wheels for tracks, and an SRF05 ultrasonic in place of the Sharp IR sensor. At … Read more

Help me connect Xbee to Picaxe!

OK, so I’m going to make a remote control to my next robot. I want to connect a picaxe 28x1 to a Xbee and I have ben trying to find
some good examples but with limited success.

As the Picaxe operates at 5V, whilst the Xbee operates at 3.3V I understand that the signal from the picaxe has to be regulated. (not just the input voltage to drive the device).
Of Cause I could run both the picaxe and the Xbee at 3.3V, but that would just screw with everything else I'm gonna connect to it.

High Low problem

We built the easy robot as per the instructions at the Home page.  Programmed it etc, worked fine, very happy.  We used the example program where he rolls about using his IR sensor to avoid obstacles.  Then we got a little creative and added an LED.  Only problem is the command HIGH turns the LED off and the command LOW turns the LED on.

Question - Rev counter

For this project here http://letsmakerobots.com/node/22474, I am needing a simple sensor to indicate the number of revolutions a tsecond that an axle makes.  However this will be in a dirty/oily place (under isde of carriage bogie) so I am wondering on the best method of sensor to use.  I think I have narrowed it down to three possibilites -

1/ Optical slot interupter with seperate encoding wheel.  Probably easiest option but how prone to dirt and mis reading.  Could be hard to clean.

Navigate around via ultrasound, avoid some obstacles, play Monty Python tunes
Using a
Meet Head, the big headed robot. Head's life is really simple being just joy and play. Well, for now at least. That may change in (near) future if I manage to get … Read more
Remote controls an Arduino/ PICAXE board connected to a computer by another computer using a wirelles network
I've tried to do this a while ago and I've had some problems finding documentation about this, so here is a quick and simple tutorial. First of all you'll have to … Read more
Navigates around via ultrasound on water
Using a
This is my first robot, I started with a boat made out of isolation foam, witch floats really well! The 'Brain' is a Picaxe 28x1 project board and I got the motor + … Read more
Self positioning buoy for scientific use
Using a
Some of you might have read my post on Whirligig http://letsmakerobots.com/node/16995 and its predecessor SEA RENDERING http://letsmakerobots.com/node/21098, and … Read more

My mac recognizes the usb cord as a modem, cant connect picaxe.

Hello all. I was wondering if anybody could tell me how i could connect to my robot? I have built everything, and downloaded the axepad for the intel based mac as well as the usb driver, when i restarted my computer and went to my network under system preferences, the computer recognized the usb as some sort of modem

it gave me the following configuration options.

Telephone number:

Account number:

Password:

 

picaxe programming sd21

hi

I am using a sd21 servo controller board with a 18x picaxe inserted. I have downloaded the sample program it ti works ( moves sevo to each end). What I need to know is how to control the speed of the servo.

What i am really after is someone to give me some program showing how i can move a couple of servos at different speeds after an imput has been activated. I tried reading manuals over and over and still dont get it.

 

regards

michael 

 

hardware not found on computer for picaxe

Hi I am trying to program my picaxe28 but my computer keeps on saying HARDWARE NOT FOUND!!!!!!!!!!!!!!!!!!! Does any one know  why it is doing this ? I tried every thing it told me to do butit still says HARDWARE NOT FOUND!!!!!!!!!!!!!!!!!!!

Mr. General questions

I've been looking into building a robot, and I found the Start Here robot and this site.  I liked it, but after looking around more I discovered the Mr.

arduino and picaxe

hi i know it is possible to link a picaxe and arduino through i2c but was woundering and a picaxe remote sent signals to arduino robot for example control the motors and a pan and tilt mechanisum

mmany thanks rhys

I am going to tell you how to use the same cable you use to program your Arduino with to program a Picaxe. I am sure this could also be used the other way around … Read more
Paints beautiful paintings whilst you watch
Using a
Picaxxo :- The Picasso style painting robot, using a Hacked Wii-Mote as tracking system picking up an infrared triangle mounted to the back of a picaxe based … Read more

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".

Tool for programing in socket PICAXEs
Some time ago I had an idea of making a PICAXE programming ’clip’ and inspired by the work of TofuRobot http://letsmakerobots.com/node/18926 I built one today. … Read more