Show Posts
Pages: 1 2 [3] 4 5 ... 155
31  Using Arduino / Project Guidance / Re: Easy and Simple Wireless on: September 05, 2014, 09:01:18 am
You forgot what is probably the most vital criterion - the range.
32  Using Arduino / Displays / Re: interfacing i2C DS3231 RTC with IIC / I2C 2004 204 20 x 4 Character LCD Display on: September 05, 2014, 02:02:53 am
This is what I use for the clock

I understand the 3231 uses the same. Note that there are two programmes, one to set the clock and one to run.

You neede to know the clock's I2C address so you can use a line like

#define DS1307_ADDRESS 0x68

for the LCD it is likely to be like

LiquidCrystal_I2C lcd(0x27,20,4);

There is a programme around that can sniff the address if you don't have it
33  Using Arduino / Project Guidance / Re: Simple Data Logger PC Software for Arduino on: September 05, 2014, 01:45:15 am
Sounds like time to read reply #2 - again...
34  Using Arduino / Sensors / Re: Bike Tire Pressure on: September 04, 2014, 10:14:54 pm
.I can figure out all the mechanical stuff and how to mount everything.

This sounds more like a bike you would brag about rather than ride, but wireless tire pressure monitors are available commercially and spare sensors are available on eBay.  The TPMS sensor reads to 87 psi, and is therefore good for a mountain bike. I imagine it is a bluetooth device and thus probably conversant with an Arduino if required.
35  Using Arduino / Project Guidance / Re: Camera self-timer on: September 04, 2014, 09:48:43 pm

So, what I want to do is to control the connection between those two wires via Arduino.

I would be a bit careful about this. I have a JYC controller that will do just about everything you can think of, plus a few you probably won't,  and I'm sure it cost a lot less than an Arduino.

Secondly, unless you are already certain of what you are about, you might question what those holes are for, or at least advise us what the camera is, as a single jack is more or less de rigueur. I have never seen an electric release socket that has two holes, but my Graflex has a three hole socket for a combination release and flash.  If you really mean old, the shutter release will more likely be mechanical and part of the shutter button, and two holes is more likely for the flash contacts 
36  Using Arduino / Project Guidance / Re: Multiple Bluetooth Modules on: September 04, 2014, 09:28:49 pm
Unless you are really PC-savvy, you might find it easier to use one Arduino as a hub for the others, thereby providing a single data feed to PC. I imagine this might be a Mega doing whatever sensing you might need and carrying an HC-06 to talk to PC, plus  two HC-05s to talk to the other Arduinos.

I say Mega because it has four proper serial ports but it may be OK to have something smaller and use software serial instead, particularly if the data traffic is one-way.

With this arrangement, I believe the peripheral Arduinos need HC-05s too. I think they are a better choice anyway, being more versatile and about the same price.

37  Using Arduino / Project Guidance / Re: Pro BTBee and Arduino UNO and android on: September 04, 2014, 08:59:15 pm
I think you will find a number of Android apps that are good for this sort of thing and it might pay to look there first.
38  Using Arduino / Project Guidance / Re: Simple Data Logger PC Software for Arduino on: September 04, 2014, 09:14:19 am
we use the time the data is sent to the arduino

You need to be more clear about your intentions. What I understood was that data would be fed to the PC, and in that event, RealTerm can receive the data and timestamp it. I don't think RealTerm would be able to to send time signals to Arduino, and one would have to wonder why you would want to do that anyway.
39  Using Arduino / Project Guidance / Re: maximum datalogging frequency with one wire thermocouple breakout on: September 03, 2014, 06:20:33 pm
The only thing I can find in the MAX31850 data sheet is

 "Temperature Conversion Time
(Thermocouple, Cold Junction,
Fault Detection)"

Which says max is 100mS (consistant with what you said, but I'm wondering how you came up with that number)

Sorry, it looks like I'm singing the wrong song. I thought from the code in your reply #1 that you were using a DS18B20, and I was alluding to the DS18B20 datasheet from Maxxim.

Does that seem right??

Yes. See my previous.
40  Using Arduino / Project Guidance / Re: maximum datalogging frequency with one wire thermocouple breakout on: September 03, 2014, 12:03:03 pm
I'm trying to figure out what it is that determines when or how fast it prints to serial,

As far as the sensor goes, the speed is governed by the resolution. With 9-bit resolution, you might get the project to run at 10Hz as the conversion takes about 93mS, but there may be other issues. You might find the SD card is a limiting factor. You might also question if you really need 10Hz. If you really do, it is probably better to use a simpler device than the DS18B20.

Check the Maxxim datasheet. The Hacktronics DS18B20 tutorial is considerably less convoluted than what you are using.
41  Using Arduino / Project Guidance / Re: Simple Data Logger PC Software for Arduino on: September 03, 2014, 11:05:53 am
I think you just use RealTerm for that.   It uses the PC clock for local timestamping.
42  Using Arduino / Project Guidance / Re: Arduino appears to be crashing. on: September 02, 2014, 01:56:41 am
The software could be stumbling over itself. You might try increasing the delay. Do you really need LCD readings every quarter of a second?
43  Using Arduino / Networking, Protocols, and Devices / Re: Android device controlling Arduino via Wi-Fi on: August 31, 2014, 07:31:14 pm

So is there a Wi-Fi module that can communicate with Android device without connecting to network?

Probably not, since the sole purpose of WiFi is to enable you to participate in a network. Your first problem is to find an Android app that enables you to bypass the network.

While bluetooth is typically only good for 10m, you can get more powerful types good for 100m which may be suitable.
44  Using Arduino / Networking, Protocols, and Devices / Re: progs needed for I2C Tiny RTC DS1307 Real Time Clock Module AT24C32 Board for ar on: August 31, 2014, 07:21:06 pm
I found this the best

and it is the most efficient as far as code space is concerned.  I have four of the eBay cheapies, and they are fine. They aren't chronometers, but who expects a chronometer for $1.99?  They gain about a minute in a month, which is fine for most people.

Their most common use is for timestamping locally stored data, you will find plenty of use4ful examples round here.
45  Using Arduino / Sensors / Re: A lot of flowsensors on: August 29, 2014, 11:23:54 pm

That's the sort I use. Mine are 3/4 BSP. They work the same way.
You might find this useful.
I find reading the rate is pretty useless but the flow quantity is very accurate.

so output is a pulsing signal and connected at digital pin 2. So i tought a Mega has 54 dig. pins. but since i will be using 4 megas i only need 90/4 = 23 digital input pins. Correct me if i'm wrong.

I believe only six pins can be used for interrupt on a Mega, hence my previous.

Pages: 1 2 [3] 4 5 ... 155