Figure B:
Pins 23–28 of the
ATmega go directly to screw
terminals for analog pins
0– 5.
1
2
Pins 15–19 of the
ATmega go directly to screw
terminals for digital pins
9–13 (from right to left).
3
5
4
6
The power LED is tied
to +5V and a 330Ω resistor
to ground.
8
The reset button goes
from ground to pin 1 of the
ATmega. Pin 1 also needs a
10K pull-up resistor. If you
don’t want a reset button,
put a 10K resistor from pin 1
to +5V.
7
9
B
10
11
12
Pins 7, 20, and 21 are
tied to +5V. Pins 8 and 22
are tied to ground.
The power supply consists of a 7805 5V regulator,
2 capacitors, and a screw
terminal. The 7805 can
accept up to 36V DC input
and will deliver 5V to the
ATmega. The green capacitor is a 0.1μf decoupling
capacitor and the larger
blue one is a 220μf 10V.
13
14
15
16
17
Pins 2–6 of the ATmega
go directly to screw terminals for digital pins 0, 1, 3,
and 4.
18
C
The 16MHz crystal resonator goes to pins 9 and 10
of the ATmega (center pin
of the resonator to ground).
terminals to the desired
ATmega pin’s screw
terminals.
pull-up resistor from pin 1
to +5V.
Pins 11–14 of the
ATmega go directly to screw
terminals for digital pins
5–8.
Figure C:
Pins 23–28 go to screw
terminals for analog pins
0– 5.
The first 6 screw
terminals go directly to the
6 channels from the R/C
receiver. None of these
wires are connected to the
ATmega. You must route the
wires from these screw
These 2 screw terminals
are connected to the 2 sets
of male servo pins below.
The top pin is signal, middle
pin is +5V, and the bottom
pin is ground.
This header is for the
R/C receiver. The top row
breaks out each channel to
a screw terminal. The second row is +5V. The third
row is ground.
terminal, and 2 capacitors.
I put in several capacitors
I had lying around (they
must be above 10V rating),
but it only needs a 220μf
capacitor at the output and
a 0.1μf decoupling capacitor close to the ATmega.
If you’re not using bulk
capacitors in your motor
controller, use several here.
I also added a 1N4001 diode
to protect against reverse
polarity.
The reset button goes
from ground to pin 1 of the
ATmega. Also use a 10K
The power supply: a
7805 5V regulator, screw
Screw terminals for
digital pins 2–11. I don’t
use digital pins 0 and 1 on
this board, and pins 12 and
13 are being used by the 2
neutral indicator LEDs.
45 Make:
