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61  Using Arduino / Motors, Mechanics, and Power / Re: Digital protractor on: September 28, 2014, 09:56:35 pm
Quote
Or a farm vehicle for those who drive it for a living, a Pro(fessional) Tractor.

Guess how we say (farm) tractor in spanish?
62  Topics / Robotics / Re: Servo Problem on: September 28, 2014, 02:05:55 pm
Quote
Can someone tell me where is the problem?
I can't see the video, but your diagram shows you're powering the servo from the Arduino.
Don't do that.

Beat me to it, so my contribution is the pic below.

63  Using Arduino / Motors, Mechanics, and Power / Re: What can I do to change the turning direction of a DC motor automatically? on: September 28, 2014, 11:30:55 am
if you got a motor that can run on the arduino I/O pins, this little bit of code i wrote will work:
.....
Your motor MUST be able to handle the voltage and amperage an arduino provides, but most DC motors can to my knowledge.

On the contrary.... very few motors will consume as little as 40mA which is max an i/o pin can provide, 20-30 rather for safety.

You really don't want to do it this way, it's asking to pop something.

Use an h-bridge,.
64  Using Arduino / Motors, Mechanics, and Power / Re: Digital protractor on: September 28, 2014, 10:05:11 am
Or a farm vehicle for those who drive it for a living, a Pro(fessional) Tractor.
65  Using Arduino / Motors, Mechanics, and Power / Re: What can I do to change the turning direction of a DC motor automatically? on: September 28, 2014, 06:47:44 am
You need what's called an H-bridge, and there are a number of chips and chips on boards that do that.

The oldest and best known are the L293 and L298, Google those, and there are loads of motor driver chips of differing voltage and current specs here at Pololu.

edit.... also look here in the Playground.
66  Using Arduino / Programming Questions / Re: How to self_reset arduino on: September 28, 2014, 06:34:17 am
Check here in the Playground
67  Using Arduino / Sensors / Re: How to make a pressure sensor? on: September 28, 2014, 06:02:24 am
Have a look here at what adafruit has.
68  Using Arduino / Sensors / Re: Ultrasonic on: September 28, 2014, 05:46:59 am
I think you should share it anyway, even if nobody wants it today.... it might help someone in a year or more, you never know.
69  Using Arduino / Sensors / Re: sensor selection on: September 28, 2014, 05:45:40 am
There was a thread recently that used an ultrasonic one for that, but I can't remember the member's name. There was something clever about the use of two sensors if I recall, one on the human and one on the robot, that made sure it followed "the" human not just "a" human.

Have a search of the forum.... it was in the last few weeks, maybe a month back.
70  Using Arduino / Programming Questions / Re: AC signal voltage on: September 28, 2014, 05:30:29 am
I bought a nice 240VAC:20VAC fused transformer the other day too

The fuse worked  smiley ...... what a jackass  smiley-red
71  Using Arduino / Programming Questions / Re: Virtual Wire library error on: September 28, 2014, 04:59:25 am
You sure the library's in the right place?- easy to get the unzip into the wrong folder layer.

Also, some libraries- I don't know about that one- have  "-Master" or similar on the end and I end up renaming; not sure if that's the right way but it works for me.
72  Using Arduino / Project Guidance / Re: What's happening with my robot? on: September 28, 2014, 04:23:57 am
Pretty sure "across" means joining them, kind of parallel thing rather than in-line, series.

edit.... added pic
73  Using Arduino / Storage / Re: EEPROM storing infromation? on: September 28, 2014, 03:01:30 am
But while it's true that a digital pin is a mere bit, won't you need to read a digital port (as opposed to pin) as a byte, else you'll end up writing a byte for each pin.

And the 10-bit analog pin is presumably going to cost 2x 8-bit bytes?

(At least, that's the way I see it.)
74  Using Arduino / General Electronics / Re: Breadboard voltages on: September 28, 2014, 02:56:36 am
Very interesting.... I have a mains output UPS so I'll do some playing.
75  Using Arduino / General Electronics / Re: Breadboard voltages on: September 28, 2014, 02:41:37 am
I'll watch those thanks Larry.

That guy sounds South African....
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