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January 1, 2009
Server side software development.
Tutorial - Spectral Triad (AS7265x) Hookup Guide
about 2 months ago
For those wanting to use this with a Raspberry Pi (or other linux embedded computer), I've started working on a Linux / Raspberry Pi library for the I2C interface:
Tutorial - AS726X NIR/VIS Spectral Sensor Hookup Guide
about 4 months ago
Worth pointing out that the UART baud rate is 115200 (doc is a little vague on this).
Tutorial - GPS-RTK Hookup Guide
about 5 months ago
A fully worked example of using rtklib with two of these modules for a post-processed RTK solution would be very much appreciated (preferably command line for Linux, and including the data files). I'm working with two of these Sparkfun modules right now and not quite getting a RTK fix yet. I suspect I'm not getting enough sky, or my antennas are not good enough. It would be nice to compare satellite SNRs, receiver settings etc from a known working example.
Tutorial - What is GPS RTK?
about 5 months ago
a minor error: "about 20km or 12,000 miles away.". I think you mean 20,000km.
about 3 years ago
I had a look at the level converter circuit and had a hunch the 1k resistor values (R7, R8) were too low (sending too much current into the Intel Galileo UART TX pin while low). I repaced R7, R8 with 6K8 and it's working now.
When used with a Intel Galileo (Gen1) board we're having difficulty transmitting data from the Galileo to the XBee. We can receive from XBee ok. We've verified that the same shield works fine in both directions when used with a genuine Arduino Leonardo R3. We have also verified that the Intel Galileo works fine in both directions when the XBee is used with another manufacturer's shield.
Looking at signals reaching the DIN line on the XBee, we get a 3.3V (or thereabouts) level with no activity on line. When transmitting data to the XBee, the voltage alternates between 3.3 and about 1.5V (approx), not 3.3 and 0V as expected. Initially I thought that we had older boards which I know had some level conversion problems, but these are recently purchased WRL-12847. Any suggestions?
about 5 years ago
"Note: Due to the manufacturer's restrictions in other countries, we can only ship these to the USA and Canada." This is why I now actively avoid Digi products. Anything Digi seems to be accompanied by a cloud of confusion. I have found their website, product structure and documentation ... unhelpful. And then when you locate what you want, nobody knows about it or refuses to sell it to you. Also my local Digi supplier (BB Electronics) suddenly dropped Digi recently (suspect they were having problems also).
News - Where does the Pro Mini 5…
about 6 years ago
Since pretty much all modes of long distance transport burn oil (in one form or another)  why not use transport costs as a means of calculating your carbon foot print. Transport companies don't operate at a loss... else they won't exist. But let's put an upper bound on this by assuming that they spend 100% of their fees on fuel. So assume crude oil is $100 barrel, and you spend $1000 on transport, then that's 10 barrels of oil. I believe that's approx 0.5 tonnes CO2 / barrel  .. so 5 metric tonnes of CO2.
 Ya, JetA1 != Diesel != Petrol ... but it must be in the same ball park.
News - SparkFun in MicroCenter
about 8 years ago
For UK/Ireland you should talk to Maplin (http://www.maplin.co.uk ) a Radio Shack clone with retail outlets in most towns. They could badly use some fresh modern kit to sell. This is their idea of a PIC programmer: http://www.maplin.co.uk/pic-programmer-48074
about 8 years ago
I just started to use two of these boards a few weeks ago. A curious thing has happened in the past week: the power LED (next to the mini USB connector) on one started flickering a few days ago and the LED no longer illuminates now. But the XBee and communication to/from the XBee seems to be working OK. The power LED on the second board is flicking also but remains mostly fully illuminated (for now).
Both devices are powered from a USB hub (powered from the PC). I think there is plenty of power available -- I don't have any problems with the other peripherals on the bus.
I'm hoping this is just a dud LED or LED resistor and nothing more serious.
The date on the PCB is 10-8-08.
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