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1  Topics / Home Automation and Networked Objects / Re: Functiodomo - New open and wireless home automation system based in Arduino on: November 25, 2012, 12:30:52 pm
How much are you planning to sell the modules for? Are they electrically certified? Do you have manuals or schematics available?
2  Using Arduino / Project Guidance / Re: Serial port, RS232/422/485, DE-9M or screw terminal? on: November 20, 2012, 11:46:14 am
Still on the fence about going with the DE-9M and looking at the ISL3330 as a inexpensive replacement for the the MAX3160.

A six screw terminal block, 5V,TX,RX,CTS,RTS,GND seems tempting since with the ISL3330 you have to jumper the RS422 outputs to the inputs to put it in RS485 mode. (the MAX3160 does not).
3  Using Arduino / Motors, Mechanics, and Power / Driving 4 LEDs and 4 Relays with a ULN2803? on: November 18, 2012, 11:20:58 am
Any thoughts on problems driving (sinking) 4 LEDs on the 5V rail and 4 Relays on the 12V rail with the same ULN2803? (diode clamp on 12V rail)
4  Using Arduino / Networking, Protocols, and Devices / ATmega328P I2C, SPI to XBee & I/O expander? on: November 15, 2012, 11:18:58 am
I'm connecting an ATmega328P, PIC18F26J11 or Rasberry Pi to an I/O extender and I've attached my current I/O map.
The I2C is a SC16IS750 8 bit + UART I2C expander with an interrupt and reset.
RS485/232 is a mode pin set by DIP switch on a MAX3160 (the half/full duplex pin isn't brought to the RPi GPIO)
The XBee is a common XBee radio, the SPI stuff is for the Bluetooth Bee.
1 Wire is an option, PWM might be handy.
Comments, questions welcome. Don't like the I/O choices; I'm listening.
5  Using Arduino / Networking, Protocols, and Devices / Re: I recall seeing an XBee socket device that used SPI. Can't remember what it was. on: November 14, 2012, 09:27:42 am
That's one, thanks. I did find the one I was interested in. It was a BlueTooth Bee.
Seems like all the recent XBee socket devices all use serial.
6  Using Arduino / Networking, Protocols, and Devices / I recall seeing an XBee socket device that used SPI. Can't remember what it was. on: November 13, 2012, 11:59:59 pm
About a month ago I recall seeing an XBee socket compatible device that used pins 17-20 as SPI.
I thought it was a Bluetooth Bee, but alas they're RX,TX.
Anyone ideas?
7  Topics / Home Automation and Networked Objects / Re: Power line communication on: November 13, 2012, 11:07:44 pm
I see, but I want something simpler. Perhaps a non-isolated circuit (no transformer).

Bad idea.
8  Using Arduino / Programming Questions / Re: Can you modulate the PWM output pin? e.g. IR blaster LED. on: November 13, 2012, 10:37:28 pm
Thank you. So it still requires two GPIO pins? Are you generating the 38kHz signal with PWM (timer 1) and the 500 Hz with Timer 2?
Quote
generates a 38 KHz signal and then turns that carrier on and off with a 500 Hz signal (generated by Timer 2) with a variable duty cycle controlled by a potentiometer. The 500 Hz duty cycle is output on pin 3 which causes a pin change interrupt which is used to turn pin 9 on and off.
9  Using Arduino / Programming Questions / Can you modulate the PWM output pin? e.g. IR blaster LED. on: November 13, 2012, 09:58:04 pm
Some microcontrollers have a gated PWM output, others you can disable or tristate the PWM output pin.
example, you set the PWM module (carrier) for 38kHz and toggle out the output pin for the data (control pulses).
Are any of these features available on the ATmega328P?
10  Using Arduino / Microcontrollers / Re: Is a ATmega328P @ 3.3V within spec for 10MHz? on: November 09, 2012, 05:59:14 pm
Thank ye. Seems 8MHz is a standard I'll stick with that.
I was hoping to use 9.8304 MHz as it's available on another IC.
11  Using Arduino / Microcontrollers / Is a ATmega328P @ 3.3V within spec for 10MHz? on: November 09, 2012, 05:50:01 pm
Is a ATmega328P @ 3.3V within spec for 10MHz?

Bonus question, can the Sketch software and bootloader be easily modified for this crystal frequency?
12  Using Arduino / Sensors / Re: Capture module (pin) in Arduino like a PICs CCP input (manchester decode) on: November 07, 2012, 11:32:05 am
Or maybe the timer/counter's capture pins, a trigger on them will latch the current counter value.

______
Rob

Yes that's the idea. Interrupts would also work but using the timers makes the chore less tedious.
13  Using Arduino / Sensors / Capture module (pin) in Arduino like a PICs CCP input (manchester decode) on: November 07, 2012, 12:30:26 am
Does the Arduino UNO have a pin with a hardware capture module? Its primary use would be pulse width decoding.
14  Using Arduino / Project Guidance / Re: Power Saving Options on the WiFi Shield on: November 06, 2012, 03:36:54 pm
Then you'll need to control the WiFi's power supply. A P-channel FET or relay might work. Of course it can't transmit or receive when off.
15  Using Arduino / Project Guidance / Re: Power Saving Options on the WiFi Shield on: November 05, 2012, 07:24:36 pm
Do you have to use WiFi?

Why not use ZigBee and a bridge, or BlueTooth, or 433MHz or Optical...
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