Etched a Purpose-Built Arduino - It Does Nothing!

Forum 2005-2010 (read only) Hardware Troubleshooting
8

I'd try...

[1] Check there is zero resistance between pins 8 and 22 of the AtMega

[2] Plug in power, and make sure you get +5V on pins 7 and 20 of the AtMEga

[3] With power still on, check you get > ~3.5V on pin 1 of the AtMega

[4] Check the LED lights up if you take out the AtMega, apply power, and plut a bit of jumper wire between pins 7 and 19 of the empty socket

  1. Check - 0.7 ohms between them (which is what I get if I short the probes)
  2. Check - 4.84v on each pin
  3. Check 0.84v on Pin 1
  4. Nothing happens. I tried powering the LED by applying 3.3v from the Duemilanove to the anode of the LED, with the ground wire connected to the Duemilanove's ground, and it didnt light up either. Perhaps the LED is bad aswell. Ill swap that out right now.

EDIT replaced the LED and now it lights when I connect 19 and 7, but it still doesnt flash when I apply power with the chip on.