2. Electronic Road Map

This section should take up to 15 minutes to complete.

Before we start assembling the electronics, it’s important to know how to read its electrical schematic. An electrical schematic is a drawing that shows us how electronic components fit together and where they should be placed on the printed circuit board (PCB) (assuming that there is one). Shown below is our DanceBot’s PCB.

Symbols

There are a lot of symbols that can appear in an electrical schematic. For now you only need to concern yourself with a few — refer to the table below.

Type Units Symbol Picture
Resistor Ohm (Ω) symbol_resistor part_resistor
Capacitor (non-polarized) Farad (F) symbol_capacitor part_capacitor
Capacitor (polarized)  Farad (F) symbol_capacitor_polarized part_capacitor_polarized
Light Emitting Diode (LED) symbol_LED part_LED

Now take a look at the electrical schematic. Notice that beside each symbol in the schematic is a Name (black) and a Value (blue).

The Name helps to identify the location of a part on the PCB and the Value helps to identify the value of this part. The name of the part above is C1 and its value is 100 nF (nano Farads).

Watch out for Polarity

Be careful! Some parts have a polarity. That means you need to put them in the right way, otherwise things won’t work! Diodes have a polarity, and in this project some capacitors have a polarity too (take a look at the table above). This tutorial will warn you of any components with a polarity.

> Proceed to Part-3: Electrical Assembly