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AVR ATmega Development Board v1
Posted at - 16th December 2017
Simple Atmega1284-PU / Atmega32-PU development board. It helps with the firmware development and new projects prototyping thanks to the following features:
- Easy connectivity design
- 16MHz Quartz
- Onboard RESET button
- 5V regulator
- Filtered power supply
- Filtered power supply for AVCC (ADC module)
- Auxiliary outputs for power supply
- All of 32 GPIO pins available
Other potential improvements:
- Power supply presence by LED indicator
- Switching power supply instead 7805 in order to increase power efficiency (and noise ;) )
- Coaxial jack for power supply input
- Lowering the value of 2k2 resistor from RESET line
- ZIF socket
- Reverse polarity protection diode
- Fuse + fuse socket
The schematic
Construction Details
Because I'm in a hurry most of the time I did'n draw this into *CAD programs, maybe I'll do for version two.
Other Notes
- Fuse bits of MCU should be modified in order to use external crystal
- The current consumption is about 32mA with 16MHz crystal oscillator set to full swing, CPU in while loop, JTAG disabled and no loads to any pin
Updates:
- The RESET button it is hard to press because it is placed near a big cap, so it should moved in next designs.
- The capacitor at ADC-REF pin was changed to a lower value - 100nF. That's because it is a high impedant voltage supply and a big caps. charge slowly.
73 de YO3BN
