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September 23, 2010
Ham Radio Operator, Electronics Tech, Network Engineer, Programmer.
“ A wind speed of 1.492 MPH produces a switch closure once per second.” Can’t be right. That would equal a 8.363" diameter anemometer. Correct me if I’m wrong, the diameter is 5.5", so 60 rpm (1 RPS) = a wind speed of 0.98125 MPH.
Tutorial - ProtoScrewShield Kit Retail
about 3 weeks ago
Momentarily connects A5 to ground.
about 7 months ago
OK, so even though the sketch says a 1k Ohm resistor should be added (and mixes up rx and tx), the data sheet says this unit is 5v friendly. I have both the enroll and the ID sample sketches operating fine, with no resistor. Pin 1 on the fingerprint scanner (black wire) is TX and connects to RX on the Arduino (Pin 4 in sample sketch), and Pin 2 (RX) on the fingerprint scanner connects to pin 5 (TX) on the Arduino. Pin 3 on the Finger print scanner connects to Arduino Gnd, and Pin 4 to 3.3v or 5v. I’m using 5v on the UNO.
OK, cable arrived, but reading the sample sketches, it appears a 1k Ohm resistor is needed because this fingerprint unit is 3v logic. I feel that this should be prominently mentioned in the part description!
The S&H costs more than the cable. Will have to wait for next order.
Wouldn’t 3.3 - 6 mean any voltage from 3.3v through 6v ……
I suggest just include the cable, and up the price of the scanner $1.50
It’s not like it can be used without it.
My fingerprint scanner did not come with a cable. It’s unusable without one. For a >$30 sensor, I expect better. I suggest you ship a cable with these in the future. What cable do I need to order?
about 11 months ago
What firmware version are you shipping now? Need 1.0.5, NOT 1.0.2 (1.0.2 does not work right with 1.0.5 IDE, and upgrading the firmware tends to brick the shield!)
about a year ago
the 1nf cap should be included.
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