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March 31, 2006
Tutorial - MPU-9250 Hookup Guide
The Fritzing diagram showing the "setup", a Pro Mini connected to the sensor, is an abomination and an excellent example of why Fritzing should not be used.
The diagram does not label the I2C connections on the Pro Mini, and fails to make it clear to beginners how to connect SDA and SCL to any other MCU board.
I am really sorry to see that Sparkfun has abandoned clear communications in favor of idiot diagrams.
about 2 years ago
"The AS7263 should not be confused with highly complex mass spectrometers". True, since mass spectrometers measure PARTICLE MASS, not light.
about 3 years ago
In addition to the comment about "overclocking" below, the RXI input on OpenLog (advertised as 3.3-6V) is 3.3 V ONLY. The schematic shows no RXI series resistor or level shifting, so it is presumed unsafe to connect this line to 5V TX pins. I've complained about this irresponsible advertising to SparkFun, but the engineers can't seem to get the web pages corrected.
OpenLog does work very well. My approach, when connecting OpenLog to a 5V TX line, is to put a 4.7K resistor in the line to protect the input clamp diode and the uSD card.
News - Announcing AVC 2014!
about 5 years ago
Does anyone know if President Obama will be entering a drone?
about 8 years ago
This product has an unresolved issue with crashing and watchdog resets and is thus unreliable even in normal applications. See the RF/Wireless forum for more information.
News - Solar Economics
about 11 years ago
Your calculation does not include the cost of storage batteries or an inverter, which is often about equal to the cost of the panels.
Xcel Energy says "A common size ... for systems in Colorado is 2-3 kilowatts, and total payments to customers for this size would be in the $9,000 to $13,500 range ... typical photovoltaic systems are priced at $8,000 to $10,000 per kilowatt."
However, a 2-3 kW system probably won't cover your electrical needs, unless you are very frugal.
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