43oh

# juani_c

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## Posts posted by juani_c

### Fuzzy Logic controller for an Iverted pendulum

it looks like the pot has quite some friction and is able to hold the pendulum?

yes, that's due to a crappy potentiometer and a lightweight pendulum, in this kind of setups the device used to mesure the angle is usually some sort of optical encoder or something like that in order to avoid any kind of friction. Unfortunately I don't have such a device and I thought about making one but the potentiometer was a faster option.

### Fuzzy Logic controller for an Iverted pendulum

My project is an inverted pendulum. The pendulum is a kind of excuse; I wanted to make something to show a library I

### [ ENDED ] June 2011 - 43oh Project of the Month Contest

My project is an inverted pendulum. The pendulum is a kind of excuse; I wanted to make something to show a library I

inverted pendulum.zip

### how to optimize code?

In an equation like this, the time-killer is the division.f

Having this in mind I did a little search and found this;

"Efficient Multiplication and Division Using MSP430"-> http://focus.ti.com/lit/an/slaa329/slaa329.pdf

There is a table on page 7 showing the results from using different methods and there is a big improvement using those described in the app note.

### how to optimize code?

I would like to make it as fast as possible. I'll try to find that book. Thanks!

### how to optimize code?

suppose I have to calcule this;

y=(((x2-x1)+(x3-x1))/3)+x1;

and I want to know how to break it down in order to have the best code in C. Does anyone know of any good resources for learning how to optimize this kind of tasks?

### Ideas to share more code

- Shipping costs. Reasonable(<\$5) shipping costs are ok. But international shipping might be a problem...

Some places (like Seeedstudio or Iteadstudio) have quite low international shipping rates

### MSP-EXP430FR5739 Experimenter Board - New DEV board

I really hope TI throws out some 1/2 off coupons like they have before..

Me too!!! nowadays currency conversion isn't that good for me. Perhaps in a while...

### TI introduces new line of value chips MSP430AF

I've just seen a mail about TI buying National Semiconductor. I thought it was another (late) April Fools joke but apparently it's true;

http://www.ti.com/ww/en/acquire/index.shtml

### demo-breathing-led (Part Deux)

Are we to assume the main body code is from the prior example?

I think is the one on page 339, wich has the port and timer configurations.

### demo-breathing-led (Part Deux)

In "MSP430 Microcontrollers Basics" on page 341 there is an example code with a similar approach for a LED driven with an exponential ramp using PWM.

### 50% off from Ti e-store............

Can you recall if the Smart Metering Board is one of these two devices?

I found these boards and thought that maybe is one those but I really can't tell. I made a search in TI's e-Shop and there is nothing similar to a Smart metering board. Kind of a mistery....

I'll show my ignorance of spanish here by guessing the meaning for fun:

"Cheap horse?"

Is something like Gift horse actually. The complete phrase is; A caballo regalado no se le miran los dientes. I found a very similar phrase in English; Don't look a gift horse in the mouth.

### 50% off from Ti e-store............

Talking about RF( and cheap/free RF) this came with TI's RF newsletter, perhaps you have already seen it, anyway;

"Radiocrafts offers free RF module plug-in boards to the TI Smart Metering Board

RC2400HP As a partnering company with Texas Instruments, Radiocrafts offers free RF module plug-in boards to the TI Smart Metering Board, providing users with a quick and easy access to wireless metering. The plug-in board can be delivered with Radiocrafts

### MSP430F2274 TSSOP 38 Breakout board?

and you can submit an Eagle file (if you use Eagle, like I do), rather than generating in the multi-file Gerber format (though Laen will take those, too).

that's good to know. I've seen that most o this kind of service asks you for GERBER files and I don't really know how to make those and, what it's more important, how to make them right. INternational shipping is only 5U\$S so I might try them in the future

### MSP430F2274 TSSOP 38 Breakout board?

If you end up designing your own board, I highly recommend The Dorkbot/PDX order. I had some made, and they are excellent quality and cheap! (Do be sure to double-check your designs, though. :oops: )

I don't if anybody know about the PCB service that seeestudio has, well there is another place called itead studio that has the same service but is cheaper, 12 U\$S for 5x5cm boards and shipping is quite cheap if you don't mind waiting. You can order max. 10 boards and the minimum is 3 boards but as you are paying anyway the 12 U\$S you should order 10.

I haven't used the service but i've heard good things about it.

### Free eZ430-F2013, just pay shipping

When I opened the invoice from TI Singapore, it was mentioned as "DDP Delivered Duty Paid", means no duty is required.

Unnecessarily got harassed by local Customs & Courier, but finally went through.

Mines said that too and they charged me anyway. I will be more careful next time.

P/S: the bill is from FeDex but the delivery was made by DHL

### Free eZ430-F2013, just pay shipping

if u live outside US, be prepared to pay (1) tax, (2) custom clearance (brokage), even w/ free shipping. i end-up paying \$20+ canadian for 2 of these when i order in september.

That's rigth. I had to pay 50% of the value (in Argentina) due to custom taxes. I thougth that maybe I would not have to pay since i'm not "actually paying" but the bill was inside the package and they considered as a purchase.

### Is this an MSP430?

Thanks I'll check out those books.

The EKG

### Is this an MSP430?

If theres interest, I might be able to post some code with a circuit to do this. I'm currently working on a small side project where I do some DSP to recognize the heart beat in an EKG (called QRS detection for those who are curious).

I'm studying bioengineering and i really like those projects that involve biomedical data acquisition and processing. I want be able to implement it but it would be intersting to see how it is done.

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