Show Posts
Pages: 1 2 [3] 4 5 ... 157
31  Using Arduino / Networking, Protocols, and Devices / Re: How to use the HC-06 without having it connected to the PC on: October 04, 2014, 08:46:53 pm
6v is the bottom limit, 7v is the minimum recommended. See the data sheets. You need either 5v applied directly, or 7>12v applied via the jack, i.e. through the regulators. If you must use a battery, you would be better off with 6x1.2v AA rechargeables.
32  Using Arduino / Networking, Protocols, and Devices / Re: Blutooth - I can only send data, not recive on: October 03, 2014, 05:55:28 pm
OK, you have proved the code is kosher. I would not have thought the app was a problem. I use Bluetooth Graphics Terminal.
33  Using Arduino / Networking, Protocols, and Devices / Re: Blutooth - I can only send data, not recive on: October 03, 2014, 09:46:59 am
I don't think charset has anything to do with it, and 9600 is the default baudrate. If you are using a phone, you are absolved from making the USB cable mistake. One way traffic should be sufficient to prove the comms, are kosher but there may be a mechanical fault. You should be able to test the code with a PC with cable - no bluetooth.

You might find the following background notes useful

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

34  Using Arduino / Project Guidance / Re: Temperature reading on: October 03, 2014, 09:29:07 am
I found this the best tutorial

http://www.hacktronics.com/Tutorials/arduino-1-wire-tutorial.html
35  Using Arduino / Networking, Protocols, and Devices / Re: Blutooth - I can only send data, not recive on: October 03, 2014, 09:23:01 am
Do you have the Arduino connected via USB cable to the same computer you are trying to  communicate with via bluetooth. If so disconnect the cable. The alternative is to use a different computer for bluetooth comms.
36  Using Arduino / Sensors / Re: Arduino Uno, converting signals on: October 02, 2014, 07:22:36 pm
Here is a typical interface for 4-20Ma. I think it was for an ultrasonic flow meter. If your flow meter is a Hall effect device, there is a project that can be downloaded from Jaycar or Freetronics. PT100s are typically used with an op-amp.

37  Using Arduino / Networking, Protocols, and Devices / Re: HC05 baud rate confusion on: October 02, 2014, 03:52:25 am
I understand that the command mode is always 38400
38  Using Arduino / Project Guidance / Re: How I can get pulse frequency value? [Arduino-Matlab Two Flowmeter code] on: October 01, 2014, 07:40:20 pm
The information you need should come with the flowmeter.
39  Using Arduino / Project Guidance / Re: Arduino Mega 2560 5v on: October 01, 2014, 11:09:21 am
I was suspecting lack of power from usb

You might be right. Inadequate power from a USB port is a common problem but a 9v battery is likely to have less power and therefore not a solution.

" all on-board leds turn off." doesn't say much. It may be lots of LEDs improperly installed, which is likely to be a problem, or just the original LEDs the board comes with, which are innocent, and the real problem is caused by other peripherals. Ultimately, the solution is to use a proper power supply, like a 9v wall wart.
40  Using Arduino / Project Guidance / Re: Data logging without an sd card on: October 01, 2014, 10:59:21 am
Use a terminal programme, like RealTerm
41  Using Arduino / Project Guidance / Re: Data logging without an sd card on: September 30, 2014, 07:51:28 pm
You can send the data direct to Excel which then does all the translating in real time. This is done using a freebie Excel macro PLX-DAQ

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2PLX.pdf
42  Using Arduino / Project Guidance / Re: Small board + LCD + Ethernet looking for advice on: September 30, 2014, 07:40:27 pm
I don't know anything about those small micros but they are well endowed with pins and have the SPI and I2C busses, so there should be no problem. I understand they are powered the same way as any other Arduino. While "laptop type" is a pretty loose term, a laptop power supply per se would be a bad choice as they are typically 19v.

No comment on Firmata, and I have never heard of Johnny Five. I understand those micros have similar memory to a Uno and thus will run the same software. You just need to check that. Your project doesn't sound too demanding and you shouldn't have any problems. I understand the ENC28J60 module is just as easy to use as the standard Ethernet these days, but I haven't actually use mine.
43  Using Arduino / Project Guidance / Re: Small board + LCD + Ethernet looking for advice on: September 30, 2014, 11:50:54 am
Ethernet shields are about the same size as a Uno. An ENC28J60 board is half the size.
44  Using Arduino / Project Guidance / Re: GSM board questions on: September 26, 2014, 07:02:16 pm
too cryptic
45  Using Arduino / Project Guidance / Re: GSM board questions on: September 25, 2014, 06:46:56 pm
So it a GSM Shield is $88 and does not come with a board. You have to buy them separately right?

You might like to let some sanity revail before you come up with $88 by googling

ebay 281015256067
Pages: 1 2 [3] 4 5 ... 157