VellemanKA05 I/O Shield for Arduino Kit, 1 Grade to 12 Grade, 2.67" Height, 2.08" Length

me encanto, esamblsr la tarjeta desde cero y lo bien que funciona

1) THIS IS A KIT that will require solderingI knew this ahead of time, but it's not clear in the desciption unless you click on more details. Do yourself a favor and buy the assembled kit. Save yourself hours and $30(unless you have a decent 30W pencil soldering iron, solder and flux on hand) I've done more than my fair share of board level soldering and repair, but if I had realized there was an assembled product available (this is why I should google things more) for about $20 more I wouldn't have hesitated. There's roughly 30 components in this kit including transistors and relays, so that's about 80 solder points at a minimum. It took me about 2 hours by the time I cleaned the board.Having said that, velleman does lay the diodes and resistors on a taped roll in the order of installation in the manual. This is nice, because the printing on the 2 different types of diodes of insanely small.This is the kit: KA05, what you want is the assembled board get VMA05, Jameco has it for $42, don't pay the $73 here on amazon.2) the board does work as advertised.it uses outputs 8-13 and digital inputs 2-7. In addition there are terminals that go to the analog inputs 0-5 with 5V zener diodes for protection. It requires a 12VDC supply for the arduino to drive the relays. The relays contacts are rated at 1A(120VAC/24VDC); good enough to using for inputs to an alarm panel(my application) but you would probably want buffer relays for light or motor control.The Inputs are pulled up to to 5VDC and need to be grounded for activation.the teminals are small and OK for 22-24 guage wire, but will be tight for 18 guage. There only three terminals for grounding the inputs.I was able to use this on both my UNO and Mega clone. Also the pins are nice and long, they'll fit above the Arduino board or stacked above an ethernet shield quite comfortably.