Simple Meccano Robot Arm: redone

The arm in its current state.

The arm in its current state.

My original Meccano type arm has been one of the more popular posts on my blog, view wise, However, it was never really a finished project. It being christmas and everything, i’ve got  some spare time due to holidays, so i’ve re-visited the robot arm.

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DIY PCB Plotter – Part One

For a very long time, i have always wanted to create an XY plotter / engraver for engraving flat sheet, and engraving my own custom PCBs. Sometimes i get all motivated, and do a lot of reading, and try and work out how i want to do it

for a while, i’ve had sitting in my shed, a box of parts that once was an old XY graph, that looked very similar to this photo:

which i borrowed from THIS PAGE Continue reading

Quick Picaxe Prototyping 5 – DC18B20 Temp probe

DS18B20 Temperature sensor on assembled board

DS18B20 Temperature sensor on assembled board

I got interested in these temperature sensors after reading about the picaxe pongsat project on Hacked Gadgets

I did a little reading, and the pongsat project seems very interesting, and very cool. If anyone is interested in the pongsats, more info can be found at JPAerospace (the company that is making the free pingpong sized experiments happen)

Anyway, back to the Temperature sensor. I managed to pick up a few off ‘ebay for a couple of dollars, and figured i should add one to my little kit of quick prototyping parts.

Following is a quick schematic, and sketch of the finished design.
Please note, the drawing of the board says “To Output”, when its supposed to go to an input. it also means Pin0 on the schematic is possibly not suitable either (i used input 7 on a picaxe 18 for the code)

Temperature Probe Schematics

Temperature Probe Schematics

And, with this post, i figured i should start adding code to show how to use the parts that i am making. its very basic, as at the time of writing, I hadn’t had a chance to play around with the probe. So here it is:

main:
readtemp 7,b1 ‘ read value of temp probe on input 7 into b1
debug b1 ‘display b1 on the picaxe programmer
goto main ‘loop back to main

And thats it for another post,
Thanks for listening,
Matt

Picaxe 18x Development box

The roughly finished product

The roughly finished product

So, I’ve been slowly working on getting this bad boy finished lately. its a picaxe 18x, all nice and boxed up. it looks a little nicer, and is fully contained, so no battery box stuck to the bottom. It is now in a semi complete state, Usable, but still needing a few things for proper completion

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Quick Picaxe Prototyping Part 4 – Variable Resistor

The Variable resistor. by far the easiest "circuit" to create

The Variable resistor. by far the easiest

so this installment is by far the easiest of these circuits, only consisting of 2 components, the Potentiometer, and the circuit block. I chose to use a 10k pot, as i have a bunch of them in one of my parts boxes. I’m not sure if it matters what resistance they are, i’m guessing its not overly critical, as i couldn’t see anything in the picaxe manual about values to use.

If you haven’t worked it out already, the terminal block is soldered straight onto the potentiometer. I had to bend the pins of the pot down, so i could get the terminal block nice and close.

So, go have fun kiddies.
Matt Out.

Quick Picaxe Prototyping Part 2

A close up of the LED module

A close up of the LED module

This is the second installment of my Picaxe interface modules, the second common part that we use in our picaxe creations all the time are LEDs. all of these modules are going to be pretty basic, and consist of merely a few components, but it makes things easier. for me anyway

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