Introducing the 3AD: 3-axis digital (I2C) accelerometer in DIP-8 package for $8
Rayman
Posts: 14,887
The Rayslogic.com 3AD is a 3-axis accelerometer with a DIP-8 footprint.
It communicates digitally with the Propeller over an I2C bus.
You can use the Propeller's existing I2C bus on pins 28&29 so you can keep your pins free.
Best part is it's·available now at the introductory price of·$8 (+shipping)!
Now available·for order·at GadgetGangster.com:·
http://www.gadgetgangster.com/find-a-project/56.html?projectnum=322
Or, you can order from me (but cheaper shipping from GadgetGangster):
Limit 3 per customer (limited quantities available).
I you wish to order one, just send me an email:·· ray@rayslogic.com·
Shipping is via USPS Priority, which is $5 for US, $11 for Canada/Mexico and $13 for International
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
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Post Edited (Rayman) : 4/30/2010 10:14:01 PM GMT
It communicates digitally with the Propeller over an I2C bus.
You can use the Propeller's existing I2C bus on pins 28&29 so you can keep your pins free.
Best part is it's·available now at the introductory price of·$8 (+shipping)!
Now available·for order·at GadgetGangster.com:·
http://www.gadgetgangster.com/find-a-project/56.html?projectnum=322
Or, you can order from me (but cheaper shipping from GadgetGangster):
Limit 3 per customer (limited quantities available).
I you wish to order one, just send me an email:·· ray@rayslogic.com·
Shipping is via USPS Priority, which is $5 for US, $11 for Canada/Mexico and $13 for International
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
Post Edited (Rayman) : 4/30/2010 10:14:01 PM GMT
Comments
It doesn't get much easier.
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Post Edited (Rayman) : 4/24/2010 8:32:53 PM GMT
When plugged into the Prop Platform's EEPROM slot, AVDD and DVDD are tied together to 3.3 VDC.· The INT outputs are tied to ground (so they're not usable) but the onboard 1k resistors prevent problems.· The address pin, A0 is tied to ground (in principle you could have two of these things on the same I2C bus).·
You probably should add a 10uF tantalum capacitor nearby to bypass the 3.3 VDC.
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Post Edited (Rayman) : 4/25/2010 12:14:19 AM GMT
It'd nice to supply without the headers soldered, that way we can use stackable headers, or even apply it underneath the bottom of a board which has the EEPROM under the prop
Please put me down for 2
tubular
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Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
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I always have someone watching my back.
This part is small enough that you could ship to Canada in a regular envelope if the headers were not soldered on. I would offer to be a Canadian distributor but I don't think there are that many of us up here to make it worth the middle man.
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I've just pinned up and tested the first batch and they're ready to ship to GadgetGangster.com.
Actually, I left a few without pins for those who may want them that way.· Also, I may keep a few here since I've already gotten orders...
I could make another 60 by the end of the week should the need arise [noparse]:)[/noparse]
Here's a photo of the first batch:
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
I didn't make too many this first run because I wasn't completely sure it was going to work out...
But, I'm going to make a bunch more in about 3 days. I'll ship most of those to GadgetGangster too, but I'll save a few in case anybody wants to order from me...
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On looking up the Freescale MMA7455 part, there are three varieties: LT, LR1 and LR2. Which one do you use?
I don't have a feel for g-force. What would some typical values or ranges be for things such as being mounted in a vehicle taking quick start/stops, tight cornering, or if mounted on one's arm, swinging a bat. I'm wondering how sensitive it is in the 2g setting? 1 g would be a person/thingy falling free; a spooky feeling. I jumped up on a going down on an elevator at the start and nearly crashed into the ceiling; testing, testing, testing...
How far removed from the Prop could these parts be located and not affect the data transfers; several feet? Sorry to ask so many questions, but this is a totally new area for me and need some sort of handle. I've downloaded the MMA7455LT data sheet, so can at least study that for some additional clues. Thanks for any help.
I too would like it if one could ship them without the headers on, if they could 'ship' via USPS in a padded envelope. Interested in at least two modules.
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Harley Shanko
I think these things are used in cell phones for orientation detection and in hard drives for freefall detection.
The tip of a bat might exceed the 8G range of this device, but I imagine that your hand doesn't.
1G is actually what you measure in one direction when it's standing still...· That's earth's gravity and that's how it can be used in a cell phone to tell which way is up.· It's also how I test them to see if they're working.
The I2C bus really isn't meant to go more than a few feet.· But, I've used I2C bus extenders that can greatly extend the range.
I'd like to sell all of them without the headers!· But, I have to think that most people will want the headers on.· So, I suppose I have to provide them both ways for now...
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
Any chance you'll be bringing some of these to the expos? I'll wait to buy them there save shipping?
Also, any chance that you could do a compatible module based on that SPI chip that does RTC and onboard ram?
OBC
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I'd love to have a small board that would handle 4 devices..
1. EEPROM
2. EEPROM or RAM
3. RTC
4. Accelerometer
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I always have someone watching my back.
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Are you familiar with the connector on the old PC/104 cards? Its essentially a female header but with longer pcb mounting pins. You can get them for standard .025" square posts (as per pc104), or in a machined pin version from companies like Mill-max.
Here's a photo of something similar
I've begged ST for some of their new digital gyro's, but they won't give me any yet [noparse]:([/noparse]
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(I assume Nick is coming, since he chipped in for the T-Shirts...)
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This should keep him stocked up for a while...
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I noticed Gadget Gangster is selling these with a 8 pin DIP socket and a 10K resistor for the Platform Platform's 2nd EEPROM location. Do you need to populate R5 with the 10K resistor for the accelerometer to work?
Forrest
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