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This project consists of two circuits (the blinking LED circuit and the servo motor circuit) connected to the same power source. I intended the circuits to be used as the beginnings of creating a toy robot, but you could probably find a multitude of uses for it.

The controllable servo motor circuit is modified from this project with what parts I had available. I only managed to get about 120º of rotation opposed to the full 180º with my circuit, so if you can get your hands on the parts for that project I would recommend using that as a guide for your servo circuit instead.

The LEDs blink indefinitely, and the servo rotations can be controlled by turning the knob on the potentiometer.

Step 1: Parts List

6V battery (I used four 1.5V batteries in a battery pack)
Solderless breadboard
Perforated breadboard
(2) 8-pin sockets

Blinking LEDs:
555 timer integrated circuit
1kΩ resistor
150kΩ resistor
4.7μF capacitor
(2) LEDs
(2) 470Ω resistors

Servo motor:
555 timer integrated circuit
470Ω resistor
LED
220Ω resistor
(2) 1N4148 diodes
10nF nonpolarized capacitor
100nF nonpolarized capacitor
47kΩ resistor
100kΩresistor
100kΩ potentiometer
HS-55 micro servo, but you could probably use any servomotor that gives you 180º rotation

Tools:
Soldering iron
Solder
Solid wire
Stranded wire
Pliers
Wire strippers/cutters

Step 2: Schematic

Step 3: Build It on the Solderless Breadboard

Build your project on a solderless breadboard first! This way you can test if it works and make sure all your connections are correct before you solder everything together.

Step 4: Solder Your Circuit Together

Once you've got the circuits working on the solderless breadboard, you can solder everything to your perforated breadboard. Use a socket to place your chip in so you don't damage the chip while soldering. I recommend soldering parts one at a time to avoid confusing wires and connections. I also ran bare wire across the board as battery and ground connections to keep things organized.

Step 5: Notes

You can vary the length of blinking intervals in the blinking LED circuit by changing the capacitance. You could change to a 10μF capacitor for slower blinking or to a 3.3μF capacitor for faster blinking. However, if the capacitance is too low the blinking may be too fast to show as blinking.

Have fun building!

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