Make a Standalone Arduino

1st version
                          
SCHEMATIC
Here are the parts used in both version :

10uf electrolytic capacitors, 22pf ceramic capacitors

10K and 220Ohms resistors

16MHz crystal, tact switch and 3mm LED

2nd version

                            

PARTS USED

1.

                                                  18650 x2 Battery Holder

2.

                                           ATMEGA328 with Arduino Bootloader

3.

                                        DC Connector Adapter Plugs 2.1×5.5mm

4.

                                            Jumper Wires male to male – 65pcs

5.

                                       Standalone Arduino ATMEGA328P-PU Kit

6.

                             Step Down Switching power DC-DC converter module

7.

                                                                             UNO R3

In first version of the making of standalone arduino we are using the popular LM7805 to regulate the power down to 5V.

The LM7805 is not the most efficient (approx. 55%), but if your project is connected to the grid, than this doesn’t really matter.

Now in the second version we are using a more efficient (up to 96%) miniature switching power supply.

If using batteries this would save power and make your project last longer.

Also it requires less connections since all the component are included on the switching board, unlike the LM7805 that requires capacitors and jumpers.

We are using 2x 18650 Protected batteries of 3.7V and 4500mAh each.

Connected in series they will provide between 7.4 – 8.4V and have a capacity of 4500mAh.

Using Protected 18650 batteries is important to make sure that they don’t get over-discharged.