By: Tinkerer
The I2C addressing shouldn’t be a problem; on the site it says that spi is also available, which is also faster than i2c. Another option: use Atmel ATxMega128a1 which has 4 i2c ports; this way...
View ArticleBy: bty
a robot with a knife somehow seems much scarier than one with a machine gun. Looks a bit like Roberto too.
View ArticleBy: Chris C.
Correction: “…one-to-a-project BECAUSE they have a fixed I2C address.” Interesting. This could be very repeatable and accurate, depending on the rubber used. It might be useful for other force sensing...
View ArticleBy: Stu
Oh yes, we all have degassing chambers! In my crappy country we’re talking about £500 for all the equipment needed to make a degassing setup. I sometimes make silicone rubber molds, I checked the...
View ArticleBy: ChrisC
Hi Stu. As you used £’s I’ll assume you’re in the UK. I had difficulty doing the same. In many cases I find that these things have odd names which you don’t expect. Try looking for ‘Vacuum desiccator’...
View ArticleBy: tinkerer
I guess that if an air bubble is trapped inside you’d still have problems with changing air pressure (weather, doors opening and closing, HVAC) in your measurements
View ArticleBy: Eirinn
Use silicone that doesn’t need degassing? Look for smooth-on products. I think they have some :)
View ArticleBy: Chris C.
If that’s the case, then it can be solved by using one sensor just for its intended purpose, and subtracting changes in its reading from the others.
View ArticleBy: Chris C.
I don’t think the issue is bubbles in the rubber. The article’s diagram shows that they’re trying fully replace the air in the sensor casing with rubber, through a hole 1mm in diameter. Though I don’t...
View ArticleBy: Necromant
You can easily mux i2c bus. I’ve done such reading of an array of color sensors via using a cpld and a custom mux. The trick is, that the DATA line gets passed as is, while clock gets muxed. The cpld...
View ArticleBy: Hugo
You don’t need a vacuum chamber to do degassing. You simply need a syringe (without needle). Suck up some of your rubber liquid and squirt back out any big air bubbles that you can. The syringe should...
View ArticleBy: bandit
There is a /SHDN line on the sensor. It takes a max of 5 mSec to wakeup, and a max of 3 mSec to read. So, you could use a ’238 to address. However, I have deep grooves in my brain from I2C, and will go...
View ArticleBy: Stu
Interesting, never thought to search for ‘dessicator’, thanks ChrisC! Still, £200-300 is still a bit steep for essentially a hobbyist activity imo. I always get the impression that if you’re in the...
View ArticleBy: Tim
You can make a pretty decent vacuum pump for purposes like this (or plasma experiments, vacuum forming, etc.) with the compressor from an old dead (refrigerant leaked) refrigerator or dehumidifier.
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