Let's Make Robots!

Microservos from DAGU?

I was just wondering..does anyone have experiences with the 8g microservos from DAGU? I'm talking about item 19 in the PDF found on this page. How do they perform compared to other generic servos of similar size like HXT900 or TowerPro SG90?

LCD pin names

We have this LCD and we are trying to connect it to the Arduino. We are having problems with the pin names. Here's what we have so far:

Vss - ground

Vcc - voltage (+)

VLc / Vee - we believe this one is for contrast - confirmed

RS : register select

R/W :read / write


D0-D7 : data pins

VB+ : LED positive

VB- : LED negative


LCD - V.Smile Pocket

Would it be possible to make this thing work with a microcontroller? It is from a V.Smile Pocket (handheld brainwash learning station). The V-Tec site says it's a "full-color LCD screen with 320 x 240 resolution". That's all I have.

The white cable is what connects it to the main circuit. It has like 25 metal points/pins. 

[My cell phone camera is not so good]...



splitting voltage

Greetings Earthlings,

Calculon's current project involves 2 12v motors (he's in the big-time now :)) but he'll probably have to use an 18v battery. He wonders what is the best way to power the brains AND the wheels from this.

Should he use a 12v voltage regulator and a 6v regulator at the same time? Or is there a better way to divide up the voltage?

How to connect SPDT relays to control a motor's direction?

I have two SPDT relays, but I don't have much info about them: [a: side label] & [b: top label]

a) 8A - 250VAC

    10A - 28VDC

    DC - 5V

b) Coil: DC 6 9 12 24V

    Capacity: 5 8 10 15A 250VAC

I also have some transistors like this one, some old circuits with various types of resistors, and some diodes too.

How should I connect these things to make a motor change its direction?

Arduino and Serial communication

Hi All,

Calculon is thinking about jumping onto the Arduino bandwagon, but he has a question or two about serial communication:

- Can an Arduino talk to a picaxe via serial? Calculon understands that picaxe signals are inverted, while Arduino's are "non-inverted"(whatever that is). Is there a way to reconcile this difference? An inverter or something?

- Do the Arduino boards such as the Duicimillanovaililuanne have outpins that can be used for serial communication?

Calculon OUT!

Using GPS via Serial Connection!

Well, I found out that Maplin had a really cheap GPS module that supports UART (Serial) at 38400 BPS. I'm still waiting for it, but here's what I have so far!

Here's the unit, and specs: (unit was JUST discontinued, so won't be able to find much info on the device itself)


xmos progess anyone?

Calculon recieved a note from his lovely postman indicating that he will get it on monday. :)

From what he's been able to read, he gets the impression that almost all mechanics/electronics (motor control, LED control, adc, sensor-type switches, and so on) must be handled by other ICs that communicate to/from the xmos board with serial ...

Is that right, or is there something he doesn't understand yet?

pir sensor


 I have this sensor from a security alarm... i have open it and get the little pir sensor (2030B).

 I have readed the pdf about it and i know what are the connectors in it

 Question... the pir sensor will work stand alone? i have connected the sensor to arduino 2009 and use some code that shows the sensor response...but i think that is not working because even disconnectiong the sensor the values are the same.

What is needed to the sensor to work? can i make it with my breadboard?






Virtual Keyboard (Reads ASCII data from COM port)

Here is a program that reads Serial data, ASCII, and turns that into keyboard strokes. Works with the Serial.print command in the Arduino IDE. (Not sure how it works for Picaxe!)


About halfway down.. kind of hard to see the download link.