Dear Bob, thanks a lot for you help, sure after what you told me, I made a mistake in assembly. For sure the I connect in 5 VDC because I used an Arduino bord connected on computer by usb as source of enerfgy. I'll try reassembly it and also I'll buy another kit and try it again. Could you send the the schematic for my email? I don't know why I couldn't download it from here. my email is this login + @eba.ufmg.br . Thanks. Marilia

Sorry, this is the device: https://www.sparkfun.com/products/10140

Dear MarkT

Thanks for answering, yes I connected it with arduino to give 5vc suply. The thing is, I`m not sure if I sold it correct because I couldn`t find a picture that ilustrates it and I can`t read the schematics.. I just followed the print graphics on the board. The care I took was to put the capacitor on negative corret position. My question is, once we put the 5vc suply does the monitor should start imidiatly?

Hi, I'm not new with arduino, but I'm new with kits. I just bought and assembly the Frequency Counter Kit from sparkfun. Does anyone know how do I turn it on... or may I have assembly it wrong that is why it shows nothing?