My son and I purchased the Blinky Grid SMT kit at recent Maker Faire. Today my son soldered all the components to the board, but when we powered it up, it did not work. I would appreciate if you could help us debug the problem.
This is what we tried so far:
1. I inspected all the soldered connections. I think they look good. No obvious blobs of solder or unconnected wires. Please see the photo here https://plus.google.com/photos/111956285780546048166/albums/5745944859299091889
so you can see for yourself.
2. Checked the ‘G’ and ‘+’ holes at the top corners of the board with a Voltmeter. They measured 3.1v as expected.
3. Tried to measure the voltage to the IC by putting a voltmeter across pins 1 and 14. I thought this should also be 3.1v but it was not. It was .5v. I also tried measuring across pins 7 and 8. One time this measured 3.1v, but later I could not repeat this and it measured .1v.
My suspicion is that the IC is installed backwards. (since the voltage would be in the correct place if the IC is backwards--but I am confused why pins 7 and 8 do not always measure 3.1v). In my board, the dot is to the left. What should be the correct orientation?
4. At various times either after turning on the power or probing different pins with a volt meter some of the LEDs randomly light. I think this would be expected if the IC is installed backwards.
Please advise. What should I do to get my Blinky Grid to work?