Today I've made another MCU-based device: breadboard-like unit with Atmel Mega88 MCU core.
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| EV-X2 board with my USBASP connected |
Device contains:
- Built-in 5V supply (L78M05) for MCU
- 3pcs 5V outputs for external devices
- Onboard AVRISP socket
- Reset button
- Clamping zeners for ADC6 and ADC7 inputs
- Switched I2C pull-up's (not exists on photos, I don't have dual DIP switches now, it will be installed later =( )
Notes:
- There is no special place for XTAL crystal
- MCU powered with 5V, so take care of level shifting when connecting 3.3V logics
Supported MCU's (without any PCB changes), TQFP-32 case:
- Atmega8/8L
- Atmega48
- Atmega88
- Atmega168
- Atmega328
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| Circuit schematic |
Components:
- Atmega MCU =)
- 1x L78M05
- 3x SMD 1206 capcaitors, 0.1 uF
- 2x SMD 0805 capacitor, 0.1 uF
- 1x SMD 1812 inductor, 120 uH
- 1x SMD 1210 inductor, 220 uH
- 2x SMD 1206 resistors, 4.7 K
- 2x SMD 1206 resistors, 150 Ohm
- 1x SMD 1206 resistor, 10 K
- 1x SMD 1206 jumper, 0 Ohm
- 1x SMD 1206 resistor, 510 Ohm
- 2x zener diodes BZX55C5V1 or similar
- 1x SMD 1206 resistor, 510 Ohm
- 1x LED
- 1x general purpose diode like M1 or M7
- 3x PBD-16 connector
- 1x PBS-4 connector
- 1x PBD-6 connector
- 1x IDC-10M connector
- 1x dual DIP switch
- 1x push button
- 1x 306-021-12 screw terminal
- 1x electrolythic capacitor 1000..2200 uF / 16V
- 1x electrolythic capacitor 470..1500 uF / 6.3V
Photos:
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| Etched PCB |
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| Mounted SMD stuff |
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| Assembled device |
Top "mask" printed on paper, glued to PCB after installing all wire jumpers and covered by scotch tape =)
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| Assembled device (bottom view) |
Files (DipTrace 2.4):
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