Here is shown, how to build an alternating blinker circuit.
Try out and enjoy!
Step 1: Materiallist & Schematics
What you need:
Power source (USB TTL Module 5V OUT)
Resistor 1K Ohm
Resistor 10K Ohm
2 X Resistor 220 Ohm
2 X LED
Capacitors ( 16V - 22uF/33uF/100uF/120uF/220uF/330uF/470uF/680uF/1000uF)
Plug all together as shown in schematics and test it.