Show Posts
Pages: 1 ... 285 286 [287] 288 289 ... 539
4291  Using Arduino / Microcontrollers / Re: Ardu Pilot Mega on: July 11, 2012, 08:59:13 am
and if i wanted to find the pins for the OILPAN as they call it ?

Again a quick Google search finds it in the sparkfun catalog:

They provide the Eagle (CAD) files so you will need to install the free version of Eagle to read the schematic.
4292  Using Arduino / Motors, Mechanics, and Power / Re: Arduino to control Sybian or other Sex Machine on: July 11, 2012, 08:55:58 am
The KBWD-13 manual shows how to substitute a PWM output for the pot.  See Figure 5c.  This would likely be a better choice than the digital pot.

I wonder if the same thing would work for the KBIC-120.
4293  Using Arduino / Microcontrollers / Re: Ardu Pilot Mega on: July 10, 2012, 07:45:09 pm

4294  Using Arduino / Installation & Troubleshooting / Re: Connecting via USB and external DC trips house power... on: July 10, 2012, 07:10:04 pm
Does the circuit breaker have a Ground Fault Circuit Interrupter (GFCI)?  That's fairly common for kitchen and bathroom circuits.  A very small current from the AC line to Ground will trip one of those.
4295  Using Arduino / Project Guidance / Re: Are there 3 PWM ATtiny chips? on: July 10, 2012, 06:54:13 pm
The ATtiny2313A/4313 has four PWM channels.

The ATtiny24/44/84 has four PWM channels.

The ATtiny25/45/85 has some PWM channels that share pins with OTHER PWM channels so you can't use all four.
4296  Using Arduino / Installation & Troubleshooting / Re: Is my Arduino broken on: July 10, 2012, 06:37:45 pm
The USB ports can only supply 500 mA (1/2 Amp).  If you draw too much current the USB port power is shut down to protect it.  Try shutting down the PC and starting it up again.
4297  Using Arduino / Networking, Protocols, and Devices / Re: bi-directional ethernet (TCP) on: July 10, 2012, 06:21:16 pm
I want one so that the uno can send data out when it wants (uno as client) and I want one so that the uno can be sent information when required (uno as server).

That's not quite the definition of client and server.  The naming depends on which side initiates the connection request.  It's the Client that sends a connection request and a Server that accepts a connection request.  Once the connection has been established then either end can send at any time.

To accept connections, use an EthernetServer object.  To initiate connections, use an EthernetClient object.
4298  Using Arduino / Audio / Re: midi multichannel on: July 10, 2012, 04:44:18 pm
Aren't there other/more timers you can use/utilize?

The ATmega328P has three hardware timer/counters.  The Tone library uses one timer per Tone.

The processor on the Arduino Mega has 6 timers.
4299  Using Arduino / Project Guidance / Re: holding ckt causing problem!!!! on: July 10, 2012, 04:40:52 pm
What are you using for the variable voltage source?  Hope it's not a PWM pin since they are switching between 0V and 5V very quickly.
4300  Using Arduino / Microcontrollers / Re: AVR ISP mkII bootloader being deleted on each programming run on: July 09, 2012, 03:27:11 pm
Usually when you can only use the bootloader once it means the Autoreset feature is not properly implemented.  Try a manual reset when you see the "Binary sketch size:" message.  If that works you need to fix your autoreset hardware.
4301  Using Arduino / Programming Questions / Re: Question about pins on: July 09, 2012, 02:50:34 pm
On the switch, that can connect from a pin to ground. The internal pullup is used to hold the pin High when the switch is open, and the switch connects the pin to ground when closed. No other resistors are needed.

Many people writing examples seem to think it's wrong for an input pin to go from HIGH to LOW when you push a button.  They insist on adding a pull-down resistor (to make the pin LOW when the switch is open) and a switch between the pin and +5V (to make the pin HIGH when the button is pressed).   As CrossRoads says you can avoid the external pull-down resistor buy reversing the action of the button and using the internal pull-up resistor.

In answer to another question: Yes, you could use 3.3V instead of 5V for the switch.  The voltage is high enough to register as HIGH on a 5V input.  The only advantage is that the external pull-down resistor will use 0.33 milliwatts instead of 0.5 milliwatts while the button is pressed.  Not a significant advantage.
4302  Using Arduino / Programming Questions / Re: Help: debug two attachInterrupt(). Is there a limitation?? on: July 09, 2012, 09:42:40 am
If Pin 3 is left open/floating it is possible that a signal on the adjacent Pin 2 is leaking in.  Try connecting Pin 3 to Ground.
4303  Using Arduino / Project Guidance / Re: holding ckt causing problem!!!! on: July 09, 2012, 08:54:52 am
As long as Enable is LOW the input voltage is connected to one of the outputs.  If you change the input voltage without setting Enable HIGH you will be connecting the new voltage to the currently addressed capacitor.  If you change the address pins without setting Enable HIGH you will be connecting the old voltage to the newly addressed capacitor, and if you need to change more then one address bit there will be multiple intermediate capacitors.
4304  Using Arduino / Project Guidance / Re: holding ckt causing problem!!!! on: July 09, 2012, 08:03:45 am
Do you set the Enable pin HIGH (disabled) before you change address bits?

4305  Using Arduino / Sensors / Re: AS5040 rotary encoder and quadrature output on: July 09, 2012, 07:47:05 am
Maybe the magnet is off-center.  You have to get it centered within 0.25 mm.

Maybe the chip you got was programmed for 9-bit resolution (one of the options).
Pages: 1 ... 285 286 [287] 288 289 ... 539