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by BlueBill
Mon Dec 03, 2012 1:05 pm
Forum: General discussion
Topic: Relays or Opto Isolated inputs, which do you use more?
Replies: 3
Views: 1301

Re: Relays or Opto Isolated inputs, which do you use more?

Thanks for the replies. To clarify the optos would have been used as inputs, not to drive the relay coils (a transistor or ULN2803 would be my choice)

Seems I'll drop the optos in favor of 8 relays, since it's I2C adding an input board would be fairly straight forward.
by BlueBill
Fri Nov 30, 2012 4:16 pm
Forum: General discussion
Topic: Relays or Opto Isolated inputs, which do you use more?
Replies: 3
Views: 1301

Relays or Opto Isolated inputs, which do you use more?

I'm putting together an I/O board and would like your opinion on…

What's more useful to you.

4 Relays & 4 Opto isolators.

or

8 Relays

or

8 Relays & a GPIO (8 or 16 unbuffered I/O pins with optional pull-ups)

All above are expandable via ribbon cable up to x8
by BlueBill
Fri Nov 30, 2012 12:26 am
Forum: Other projects
Topic: Where is the new mounting hole located on the model B?
Replies: 2
Views: 1465

Re: Where is the new mounting hole located on the model B?

That's perfect. Thank you.
by BlueBill
Thu Nov 29, 2012 3:35 pm
Forum: Other projects
Topic: Where is the new mounting hole located on the model B?
Replies: 2
Views: 1465

Where is the new mounting hole located on the model B?

Is there an official layout diagram with dimensions on the new RPi?
Mainly where exactly is the mount hole located and what diameter is it?
by BlueBill
Wed Nov 21, 2012 4:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CTS, RTS & DTR in hardware?
Replies: 6
Views: 7587

CTS, RTS & DTR in hardware?

Does the console serial port have CTS, RTS & DTR pins on the GPIO connector?
by BlueBill
Wed Nov 21, 2012 2:00 pm
Forum: General discussion
Topic: Which (if any) GPIO pins can trigger a hardware interrupt?
Replies: 4
Views: 1107

Which (if any) GPIO pins can trigger a hardware interrupt?

Which (if any) GPIO pins can trigger a hardware interrupt?
I need at least two input pins that support an edge triggered interrupt.
by BlueBill
Tue Nov 20, 2012 9:53 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Not using the serial port as console?
Replies: 3
Views: 872

Not using the serial port as console?

I was reading an article about turning off the console on the RPi serial port.
http://www.irrational.net/2012/04/19/us ... rial-port/
Is this possible on most RPi recommended distros or is the TX/RX tied to the console?
by BlueBill
Sat Nov 17, 2012 12:21 am
Forum: Beginners
Topic: Can the RPi be powered by 3.3V only?
Replies: 17
Views: 3491

Re: Can the RPi be powered by 3.3V only?

The BCM2835 has 5V on its pins so that might be an issue.

Anyways I'll put use an LM2675 5V & NCP1117 for 3.3V on my project. Even though I'm only using the 2675 to power the RPi.
by BlueBill
Fri Nov 16, 2012 11:51 pm
Forum: Beginners
Topic: Can the RPi be powered by 3.3V only?
Replies: 17
Views: 3491

Re: Can the RPi be powered by 3.3V only?

Thanks, that kills that idea.
by BlueBill
Fri Nov 16, 2012 11:33 pm
Forum: Beginners
Topic: Can the RPi be powered by 3.3V only?
Replies: 17
Views: 3491

Can the RPi be powered by 3.3V only?

Is it possible to bypass the 5V regulator and power an RPi from a 3.3V supply via the 26pin GPIO header?
by BlueBill
Thu Nov 15, 2012 4:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO, I2C, SPI to XBee & I/O expander?
Replies: 0
Views: 1989

GPIO, I2C, SPI to XBee & I/O expander?

I'm connecting a 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 XBe...
by BlueBill
Thu Nov 15, 2012 12:49 am
Forum: Automation, sensing and robotics
Topic: Thermostat314 - rPi/python powered Thermostat
Replies: 7
Views: 5816

Re: Thermostat314 - rPi/python powered Thermostat

The fun part is getting the temperature reliably and accurately. Opps yes 100ohms & 0.1uF It doesn't matter which order, it's bidirectional. Your 1/4w & 50V should be fine for your 24VAC application. And 1 snubber per relay. http://static.electro-tech-online.com/imgcache/8772-io25.gif Typical relay ...
by BlueBill
Wed Nov 14, 2012 11:45 pm
Forum: General discussion
Topic: Price Gouging
Replies: 23
Views: 7075

Re: Price Gouging

Sosukodo wrote:My only recourse is to speak with my wallet. I've chosen to abandon my Raspberry hopes in favor of a more affordable device.
Curious as to what?

There's a local vendor here in Toronto, Canada that sells them for $42 retail.
by BlueBill
Wed Nov 14, 2012 11:39 pm
Forum: Automation, sensing and robotics
Topic: Thermostat314 - rPi/python powered Thermostat
Replies: 7
Views: 5816

Re: Thermostat314 - rPi/python powered Thermostat

Want a PID challenge? Try a Sous-vide controller.

The 3M-50 works like a charm, but could use some features that could be added with software. Anticipation would be one e.g. You've got it set for temperature at time, a top of the line stat would have it at that temperature at that time.
by BlueBill
Wed Nov 14, 2012 4:10 pm
Forum: Automation, sensing and robotics
Topic: New RPi Relay, Opto, XBee, Serial board
Replies: 1
Views: 1278

New RPi Relay, Opto, XBee, Serial board

I'm working on a new Raspberry Pi, Arduino (ATmega328) & PIC (18F26J11) extender board. 4 Relays 5A 4 Opto inputs 3-30V XBee socket (XBee, WiFi Bee, GPS Bee & Bluetooth Bee compatible) SC16IS750 (I2C, UART & 8bit I/O port) MAX3160 (RS232,422,485) Supports either Raspberry Pi, AVR or PIC (28pin DIP s...
by BlueBill
Wed Nov 14, 2012 3:43 pm
Forum: General discussion
Topic: Bitcoin production power
Replies: 4
Views: 1727

Re: Bitcoin production power

The electricity would cost more than the bitcoin.
by BlueBill
Wed Nov 14, 2012 5:06 am
Forum: Automation, sensing and robotics
Topic: Thermostat314 - rPi/python powered Thermostat
Replies: 7
Views: 5816

Re: Thermostat314 - rPi/python powered Thermostat

Was considering doing the same. Until... I bought a Radio Thermostat 3M-50 WiFi thermostat. Seems it's possible to control via a Python script, sounds like an ideal task for the Raspberry Pi. The API is available from Radio Thermostat. PS don't forget those relay contacts need snubbers else they'll ...
by BlueBill
Wed Nov 14, 2012 4:56 am
Forum: Automation, sensing and robotics
Topic: RF Host-Slave Control For Home Automation
Replies: 25
Views: 9084

Re: RF Host-Slave Control For Home Automation

Great blog, I'm building my own Raspberry Pi I/O board with PIC, AVR & XBee socket support.

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