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December 15, 2007
about 11 months ago
The linked product page says “Use both vertically and horizontally!” How well this will work depends greatly on the weight of your camera (or whatever) and the torque of the motor you use: you need a motor powerful enough to raise the load against gravity. A small stepper and a heavy DSLR are going to be a bad combination!
I don’t think the first concern is gear slippage, as the belt can be seen in the assembly instructions to be a toothed belt.
“Features” section says 3.3V ± 0.5V but datasheet says “2.7~5V”. Which is right?
I needed to convert from a 1.8V device to a 3.3V device. When the 1.8V was connected connected via unpaired 6" jumper wires, the result was unworkable. Shorter wires (under 1") might have helped, but I went whole hog and ended up doing a custom board with the TXB so that there was only a half inch of PCB trace (with nice ground plane) instead of wires. That seems to work like a champ.
about 2 years ago
There seems to be no shortage of threads about “Access denied” with genuine Arduino boards for that matter: https://www.google.com/search?q=access+denied"+site:arduino.cc
perhaps one of them holds the answer to your problem. For what its worth, I suspect any Access Denied error is due to a Windows software issue, and unlikely to stem from any difference between the genuine Arduino Uno and this board.
about 2 years ago
Oh yes! Or just an arrangement of a SMT loading resistor + 2 pads for you to solder this on yourself. ADC6/7 just cry out for any use at all. Other ideas include pads for a SMT thermistor (again, would require a loading resistor) or the TMP36 temperature sensor. I’m not saying to increase cost by $1 by populating them, but give us some pads that might turn out to be useful.
The BOM calls Y1 a 16MHz resonator, so I’m guessing it’s the less expensive and less accurate part. A typical* resonator has .5% tolerance, or 7.2 minutes/day, so it’s a poor solution for timekeeping needs.
*typical = first 16MHz SMT resonator I read a datasheet for
Yes, this board has the same functionality as the Arduino Uno: USBVCC is gated to +5V when VIN (barrel jack voltage) is below a threshold. Have a look at the “Comparator / 3.3V Regulator” section of the schematic as compared to the Arduino Uno reference schematic.
Any tips on how to get eagle 5.6.0 free version to route this board? It seems to not want to route to those SMD headers, whether in autoroute or follow-me mode. I wanted to try modifying the board design with some of the ideas mentioned in this thread, but (re)routing everything is quite a chore.
5V according to the schematic. Color me confused that they don’t explicitly mention this in the bullet points.
Hey, just another crazy idea. The atmega328 in the surface-mount package has ADC6/7 pins, but these are no-connects in the redboard’s schematic. Why not route these to arduino pins A4/5 with surface mount jumpers (connected at the time of manufacture) to atmega pins ADC4/5.
As shipped this looks like it would be fully arduino-compatible (hm, possibly excepting input impedance of A4/5, so complicate the bridge a bit so folks affected by this can sever ADC6/7 from A4/5) but once the jumpers are cut you have 8 ADCs available, or you can use 2-wire serial and 6 ADCs simultaneously, all within the UNO R3 form factor.
Ascii schematic in case it clears things up (same for PC5/ADC7/A5/SCL):
PC4 ---+-(-|-)---- ADC6 (avr pin names)
SDA --' `------ A4 (arduino pin names)
with (-|-) representing a 3-way surface mount jumper (SJ2 or SJ2W) manufactured with all pads connected.
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