Antes de mais nada, como os motores serão ligados ao Arduino? Através de um shield ou diretamente?

Se através de shield, qual o shield? Por qual IC é feita a interface com o Arduino?

Se diretamente, qual a potência dos motores, qual seu consumo de corrente, qual sua corrente de partida, etc...

O seu Delay(5000) está definitivamente atrapalhando o seu programa.

Isto quer dizer que enquanto ele está processando o "delay()", mais nada poderá acontecer por 5 segundos, o que é muito tempo. Dependendo de quanto tempo ele fica na parte útil do loop(), seu arduino provavelmente fica o tempo todo no delay().

Use a função millis() ao invés de delay()

Is it possible to send real time image and sound through the bluetooth?

I don't think so. Bluetooth has a very limited throughput (2.1 Mbit/s for Bluetooth 2.0 + EDR). Not only that, but the Arduino would have to process and the A/V data to send it over bluetooth as a stream. I don't thing it is possible to implement a codec + protocol in an Arduino without the help of dedicated chips.

I don't know of any devices that transmits live video through bluetooth.

[won't]

I didn't realise that, so you've got a double whammy then, low wages and high costs.

Exactly. Cars in Brazil, for example, cost a lot more than anywhere else. The least expensive car in Brazil, the Fiat Mille (no AC, no power windows/doors/steering, no alarm, tinted windows, no nothing) costs the equivalent to US$ 14,600 today.

The question with wages is that an employee costs a lot to the employer, bacause there are so much taxes and duties to be payed, such as social security, IRS, and so on. An employee that has a liquid income of about R$ 1,000 costs his employer exactly R$ 2,240.

All of the Australians I know are very nice people, and my sister-in-law's husband is Australian. I know I'd get along with them beautifully, but I also know Australia has 4 distinct seasons: hot, damn hot, even hotter and "I can't believe it isn't summer".

Obnoxious import regulations, as well, apparently.

Don't get me started on those!

On the other hand, our senators and representatives (both state and federal) are among the most well paid politicians in the world.

The Olympics in Rio de Janeiro were being discussed on the radio recently, they were saying i'ts going to be very expensive for the guests coming in to see events.
http://en.wikipedia.org/wiki/2016_Summer_Olympics

CrossRoads, I remember in a recent thread we talked about Boston, and I mentioned how much I loved it. You were in the thread, as well as another user from Boston. I mentioned how much I loved the city when I visited (twice) it in 1991 and 1992. I am so sorry about what happened there and I hope you and your family are ok.

Before the 2016 Olympics we will host a FIFA World Cup (Soccer), next year. My city is one of the host cities, and you can be sure I won't stay here! There will be a total of 11 host cities, although most of them will only have 1 or 2 matches at most (there will be 10-14 games in my city).

Most cities in Brazil have absolutely no infra-structure able to comfortably receive the amount of tourists a World Cup brings. I work about 9.3 miles (15km) from my house, and yet most times it takes me 45 minutes to go from home to work and vice versa, by car, in a normal sunny day. Public transportation sucks and is expensive. Riding a bike would be a solution I'd love, but there are too many hills here and there aren't many bike-only lanes in the streets. Besides there is no place to shower where I work, which makes riding a bike an even worse choice.

Now take all those problems and condense it to a single city: Rio de Janeiro, one of Brazil's most violent cities. That is what the 2016 Olympics will be, except there are no hills there: the city is mostly flat. It is hot, however. Do you guys think Australia is hot? Rio de Janeiro is hotter and I am willing to bet money on that!!! I don't know how much news you guys get about Rio de Janeiro, but every now and then the Army and our poor-man's version of the Marines have to invade the favelas (fortified slums, made fortresses by drug lords).

If you get the chance, ask any athlete who was in Rio de Janeiro for the 2007 PanAmerican Games what it was like.

Don't get me wrong, there are many things I love in Brazil: fruits are inexpensive, there are beautiful places to go (last week I was here: Cataratas do Iguaçu), and we have beautiful women. The problem is that over 50% + 1 of our population is ignorant and illiterate, and keep on voting on politicians that want nothing but steal from and screw us, so the same old people keep running the country indefinitely. Nothing changes, ever.

None of the population was favourable to Brazil hosting the Olympics or the FIFA World Cup. What we need is more schools, hospitals, road paving, libraries, and not stadiums. Those 2 events are only happening because of our former president's ego (Lula, hated by everyone with an IQ > 1, **THE MOST** corrupt politician we ever had). Now we are short over US$ 43 BILLION (with a capital "B"), just so we can please Lula, a few tourists and a handfull of soccer players, and not a single school has been built.

Sorry for the long post.

Já pesquisaste quanto custa enviar um chip comparativamente ao preco de compra?

Para mim, com ninguém que fale Português perto de onde vivo, não tem interesse... e também não tenho assim tantos componentes de sobra que possa trocar. Mas acredito que em zonas com mais gente perto umas das outras isso seja uma boa ideia.

Já pesquisaste o programa de samples das principais empresas de electrónica? A TI, Maxim, OnSemi e Fairchild são muito liberais com as suas amostras. Ainda melhor que trocado, só à borla.

Oi bubulindo!

Eu pretendo fazer algo regional, de forma que o custo de envio fosse irrelevante. Por exemplo, uma carta simples de minha cidade a Sao Paulo ou Rio de Janeiro custa menos de US$ 1,00, portanto ficaria bem barato.

We discussed money the other day, I asked how much an EE would expect to get in Brazil and the answer was $2000, "A week?" I asked, no that was a month. Of course it's cheaper to live there so it's not a fair comparison but it's still a lot less than in the west.

We decided that things were back to front, I should move to Brazil and do work for companies in Oz/US/EU.

By truckloads of money I mean over US$ 300K / year.

A good EE with a solid background and experience can earn up to US$ 10K in Brazil, working for multinational or mining companies. My cousin is an EE, with a masters degree, and hìs monthly income is > US$ 15K, and he works for a mining company.

Brazil is a very expensive country to live in. I was just in Argentina and Paraguay last week and food there is 1/4 of what it costs here. Everything else is less expensive there as well. I can't believe other people actually want to come live in Brazil, when most people just want to get out. Since our government is extremely corrupt and extremely badly managed, our tax money goes down the drain, and taxes increase everyday. We are in 20-year high inflation rate, and the inflation for the first 4 months of 2013 has already surpassed the entire inflation for 2012.

We have the most expensive gasoline in the world, yet we don't import any oil. Gasoline in Argentina is half the price of what it costs here, and they buy oil from us! Can you believe that?

A simple indicator is tourism: it is cheaper for a Brazilian to go sightseeing in Argentina, Chile, Uruguay, Mexico, Miami and NYC than to go to places in Brazil. For example: a place round-trip ticket from my city (Belo Horizonte, Brazil's 4th largest city with almost 3 million inhabitants) to Miami costs about US$ 700. From my city to Joao Pessoa, a city in northeastern Brazil, it is over US$ 1,200. Since I`ve been to Miami a few times, I can tell for sure everything there is less expensive than in Joao Pessoa. Not to mention Miami is a lot safer.

My sister in law has invited my and my wife to move to Australia a few times. Once my wife finishes here post-doctorate, we might just accept her offer.

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I don't see that happening. Good luck.

That's the thing. I feel that no matter what we do we're still looking at over $20. The breadboard is around $10 alone, and ATmega328 is $5. A couple of dollars for the 16MHz crystal, wires, shipping, etc.

You can make your own board at home, for very little money. If you already have a blank PCB and ferric chloride, we are talking about ZERO investment. Both of the previous items are very cheap.

The only real expensive part is the Atmega328P-PU chip, but you can buy them for $2.95 from Amazon.com. There is one seller (Baligna) there selling the non-P version of the 328-PU for $1 each.

I have 5 Arduino boards I built at home. None of them have built-in USB port, but I expose both the serial port header for a FTDI USB adapter and the ICSP header (for using with ArduinoISP, USBasp or avrisp).

Below are 2 examples of Arduino clones I built at home. The first is a specialized arduino board, with a buzzer, header for bluetooth, FTDI Basic header plus a few other connectors I need. I don't need to make all the arduino pins available in this board.

The other is a general purpose Arduino, also dependant on an external FTDI adapter.

Both feature an Atmega328-PU (of the non-P type), but flashed with the regular UNO bootloader. I used an Arduino as ISP  and breadboard to flash the bootloader on these 2 chips.

You are absolutely correct, and I also feel that way sometimes.

2-3 of my classmates from college, who left the engineering field even before graduating are doing *very* well, financially. One was a trainee at PriceWaterhouse (there was no Coopers yet back then!) in our junior year. The other started working in banking and now is in finances.

Those who are still in the engineering field, but are making money by the truckloads, left Brazil some time after graduation and are working in aerospace engineering in the US, Germany and France.

Although I went to engineering school, I never worked with engineering. My day job is as a systems analyst and MS SQL Server DBA. The engineering knowledge helps me every single day, however.

I'm too lazy to create an account just to see what your pricing is like.

That makes two of us. I am not going to register unless I am decided to buy, and knowig prices beforehand is a requirement.

I don't understand why people make such bad business decisions, specially when their competitors aren't going down that road.

You can use a cheap Bluetooth adapter for the Arduino, and then control the ROV through your phone's bluetooth.

If you already has a RC controller and receiver, that may also work, although I belive the programming for the in the Arduino side might be a little more complicated.

You left the important part out, wildbill: flick the switch off and on a bunch of times in the hope that the result will differ one time and the light will start working. What a colleague of mine used to call POPO.... power off, power on.

Power switches are nondeterministic, therefore the POPO approach often works!

Olá a todos!

Vários hobbistas de Arduino - eu entre eles - provavelmente possui diversos componentes eletrônicos que não vão mais usar ou não precisam, sejam componentes novos ou usados mas funcionando.

Eu, por exemplo, possuo vários motores, CIs, leitores de cartão SD para Arduino, relés, etc que não uso nem usarei. Por outro lado, tenho demanda para vários componentes que não consigo comprar com facilidade aqui no Brasil.

A minha proposta é criar um mecanismo de escambo, de troca, entre nós usuários do fórum Arduino, baseado em uma relação de confiança mútua, destes componentes. Ao invés de ficarmos comprando, vamos trocar o que temos sobrando com quem tem o que precisamos! Em nenhum momento estas "negociações" deverão envolver dinheiro: apenas escambo!

A longo prazo, teremos uma lista de pessoas que são confiáveis ou não para se negociar, criada através de avaliação de outras pessoas.

O que acham?

Usar qualquer regulador de tensão que seja linear, como o LM7812, é, literalmente, DESPERDIÇAR energia.

Toda a diferença de energia entre os 24V que o regulador linear recebe e os 12V que ele precisa entregar, serão desperdiçadas na forma de calor. Dependendo da corrente do circuito que o regulador irá alimentar, você precisará de um dissipador de calor gigante, ou então o LM7812 nem será capaz de te atender (1.5A máximo)

Você não terá qualquer vantagem usando uma bateria de 24V. Use várias de 12V ligadas em paralelo (para aumentar a capacidade de carga sem interferir na tensão), despense o regulador de tensão, coloque algum mecanismo para proteção contra inversão de corrente ou sobretensão e pronto.

Cara, sério: o cara que pediu uma bateria de 24V achando que será melhor, não tem a menor noção do que está dizendo. 2 baterias de 12V ligadas em paralelo são 10 vezes melhor do que uma única bateria de 24V.

Além disto, seu projeto ficará mais barato e mais simples, pois não precisa de qualquer circuito adicional para regular corrente.

No entanto, se seu cliente burramente insistir em uma bateria de 24V, use um mecanismo de regular tensão baseado em SMPS (Switching Mode Power Supply), que tem um mínimo de desperdício de energia e suporta cargas muito maiores do que os reguladores lineares. No entanto são mais caros e mais complexos.

Eu uso o DS1337+ (também da Maxim), e ele possui alarmes, que funcionam via interrupts.

Este é um vídeo do shield que eu criei usando o DS1337+:



Note que o Shield possui 2 jumpers, que permitem ativar ou não as 2 linhas de interrupções do DS1337+ ao Arduino. Ou seja, se eu desejar, eu libero os pinos para outros shields usarem livremente ou então deixo o que eu desejar acionado pelo DS1337+ caso tenha algum evento de alarme programado.