I am continuing this from my "cheapest AVR programmer" thread:
I am using an M48 on a breadboard.
I have assembled the ladyada kit.
When driven from my laptop USB port, the green power LED in ON and I have measured the voltage at the JP3 connector and it is 5V.
Now, I have connected the 6 pin connector from the Ladyada kit to my breadboard as shown in the schematic attached. (except pin 2 which is VCC on the 6 pin connector).
I tried shorting JP3 connector and connecting it to my VCC on my M48. When I measured the voltage on my M48, I saw about 1V. What is happening here? Why is my micro loading the ladyada supply?
Now, my understanding is that you can either 1)use the JP3 supply from the ladyada kit to drive your micro OR 2) you can use an external supply to drive the micro.
Since option 1 was not working, I removed the pin 2 connector and used an external regulated (LM7805) 5V supply to power the chip. All the GND pins (breadboard and ladyada kit) are common.
After connecting the board and starting my AVRStudio, I could not get it to recognize my M48.
What am I missing here?
The one thing I noticed on the ladyada schematic, is that it mentions
Buffers are powered by ext target power when OUTPWR jumper not installed.
Maybe this is what I am missing?
Or could it be that the Attiny on the ladyada kit is not programmed as Lee mentioned in my previous post?
Any help appreciated.