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1  Using Arduino / Storage / Re: Arduino uno + SD card module on: August 21, 2013, 06:59:05 am
Mine have level conversion with a resistors, if this one doesn't have it will be very strange.
If they care about powering with 3v3 why they leave it without level conversion for communication?

Anyway CPalha, I can't guarantee that. make sure that resistors are a tensor divisor.

or do it your self like this http://img441.imageshack.us/img441/2391/schematicuo7.jpg
2  Using Arduino / Storage / Re: Arduino uno + SD card module on: August 21, 2013, 06:41:56 am
Hi CPalha,

It will work directly, that sdcard reader have a 3.3v regulator included (AMS1117), so you don't need to care about voltages.
Just put 5v or the 3.3v from arduino directly in the corresponding pin 3v3 or 5v.

I'm using a similar one in one of my projects.

3  Using Arduino / General Electronics / Re: help power an Arduino with a regulated 3,3v (using lipo) on: August 14, 2013, 04:40:28 am
Thank you very much, I've already order a couple of MCP1824 samples on microchip website. smiley-grin
4  Using Arduino / General Electronics / help power an Arduino with a regulated 3,3v (using lipo) on: August 14, 2013, 03:50:41 am
Hi everyone,

I've made and standalone Arduino uno to interface with a Nokia 5110 display.
I'm powering the circuit with a lipo battery directly, I have 3,85v now, but if I charge it, I will have 4,2v +/-

The maximum voltage for the display it is 3.3v, so it will be risky having 4,2v.

which is the best way to regulate the power to 3.3v with a Lipo? I'm thinking in a zener diode, what do you think?
(the lm 1117 for example needs an input of at least 4,5v)

Regards
5  Using Arduino / Programming Questions / Re: DHT11/22 Isis Proteus Library on: January 15, 2013, 01:07:58 pm
Does anyone uses another simulator like proteus? maybe with more libraries..

Proteus Seems very goods, I've already played with pcd8544 display+adafruit library and it works like a charm.

Thanks
6  Using Arduino / Programming Questions / DHT11/22 Isis Proteus Library on: January 15, 2013, 10:01:50 am
Hi,

I've already searched on internet without success.
Does anyone have it?

Thanks in advance
7  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth Module TX HELP on: April 24, 2012, 06:33:34 pm
Well, there is a few things that I don't realise.

With USB connected tx and rx doesn't work, so if you want to be able to use it, you cant power arduino with usb cable.

I already establish connection between pc and arduino via bluetooth
8  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth Module TX HELP on: March 31, 2012, 09:37:38 am
Ok, with a delay(2000); between the commands it does'nt happen.

code:
void setup() {

  Serial.begin(9600);
  delay(3000);
  Serial.println("AT+NAMEteste1");
  delay(30000);
  Serial.println("AT+NAMEtest2");
  delay(30000);
  Serial.println("AT+NAMEtest3");
  delay(30000);
  Serial.println("AT+NAMEtest4");
  delay(30000);
  Serial.println("AT+NAMEtest5");
}

The name of module change successfully every 30seconds, but without response

any ideas?
9  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth Module TX HELP on: March 30, 2012, 07:20:36 pm
Ok, now I discover something..

When I send 2 "AT" commands the BT module don't assume the "enter" between the two commands, see the image attached.
 the 2nd image is a capture from my phone, look what I found.. name+ second command I sent

10  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth Module TX HELP on: March 30, 2012, 05:01:47 pm
Now I connect bt 3 GND pins to ground, instead just one..

still not working..
11  Using Arduino / Networking, Protocols, and Devices / Re: Bluetooth Module TX HELP on: March 29, 2012, 11:11:35 am
I've already disconnect led pin, and add a 1k resistor between tx bt pin and rx arduino pin, but its the same, no response from bt module.

any ideas?

thanks
12  Using Arduino / Networking, Protocols, and Devices / Bluetooth Module TX HELP on: March 28, 2012, 06:30:15 pm
Hi guys,

I bought bluetooth module, you can find the datasheet here:
http://www.e-gizmo.com/KIT/images/EGBT-04/EGBT-045MS-046S%20Bluetooth%20Module%20Manual%20rev%201r0.pdf

I can successfully set speed and name with AT commands, but I never receive any RESPONSE, like "OK" as supposed.
I've double check the bluetooth TX  wire, it seems its everything ok.

code:
void setup() {
  pinMode(13, OUTPUT);
  Serial.begin(9600);
  Serial.println("AT+NAMEBrownie");
  digitalWrite(13, HIGH);
}

Thanks in advance
13  Using Arduino / Project Guidance / Re: self balancing bot on: December 09, 2011, 09:29:07 am
I thing the l293d maximum power is 0.6A, and the l293ne support 1A.
For more you should use l298..
14  Using Arduino / Project Guidance / help on Floppy\CDROM bipolar Stepper on: December 09, 2011, 09:04:57 am
Hello everyone,

I'm newbie in arduino world, but I have some basics in electronics.
I'm trying to put a floppy stepper working, but I'm not sure if it works without a floppy chassis.. motor seems broken when I try to moved manually.

Does anyone already do this?

Basically I'm using an l293ne (without diodes, I think they aren't necessary with this small motor) (I can't find l293d anywhere)

with the flow schematic: (pinout of sn754410ne its the same)



- The motor seems to do something, it make noise, how can I identify motor coils? I match the IC outputs 1-4 with motor pinout 1-4.
- for motor power supply I'm using 5v of arduino, I supposed it's OK, no?

Thanks in advance


15  Using Arduino / Project Guidance / Re: Help Choosing Arduino and BT module on: July 13, 2011, 09:42:15 am
i'm not familiarized with xbee too, but at least bluetooth sounds more "standart".

does xbee "talk" with bluetooth devices? pc? android devices?
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