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July 23, 2007
Creator of the Colorganic Spectralizer and Colorganic Spectralizer Kit (Sparkfun product KIT-10446).
News - March Caption Contest
about 2 months ago
ALL GLORY TO THE HYPNOTAZ
News - Headers or No Headers?
about 3 months ago
Include the headers but don’t solder them into place. Sometimes I want to use a different style of header, or none, so they have to be removed anyway. Plus boards usually survive shipping better without the headers attached.
about 5 months ago
The Tx pin is wired, not Rx, and it’ll send out a default information stream by itself. The Rx pin is needed to send it commands, but the skimpy documentation leaves us guessing at what commands will work.
News - The Arduino popularity co…
about 6 months ago
He’s right; just taking into account the number of Pro Mini’s that I’ve bought on eBay would wreck their pie chart.
News - Standing with Ahmed, and …
about 8 months ago
Since this was a fake bomb, the proper procedure is to throw it out the window, at which time it should immediately detonate and provide an entertaining fake explosion.
News - Quantified Living: Fight …
about 9 months ago
CBT can be quite effective against some types of depression. But it requires self-awareness to recognize the onset of a depression episode. The sooner the onset of an episode is detected the more effective the CBT becomes, so if you can create a device that detects the onset of depression quickly it could certainly help people.
Anxiety disorder is tough to fight and I feel for you. Avoid retriggering, stress, caffeine, artificial sweeteners, hope for the best, and never give up.
about 11 months ago
It’s most likely just tracking the amount of power it takes for the IR receiver to detect the signal (by varying the LED power with the PIC DAC); the power required corresponds to the distance to the object. This is done with each LED separately and then the results are combined to calculate the X and Z positions.
Sure it would work; it should be interesting to see if you get better performance than a simple voltage divider and a 10 bit A/D. The eTape Wheatstone bridge configuration will give a full scale signal that’s practically linear, which is very convenient. Referring to the eTape datasheet, try using 75K for R1,R2 and 900 Ohms for Rref to get a +/-40mV signal for the HX711.
You are correct; this is not a true RS485 implementation. It’s more like SAE J1708, which is an OR-tied differential bus that runs at 9600 baud.
News - Your March Caption Contes…
about a year ago
In Soviet Russia, Redbot programs you to follow lines.
The major parts for Joel’s RFID garage door opener.
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