Mounting a Smapler v0002 step by step

Step 4 Hooking up the Pots and Knobs

This is an important step. If you were careful with the wiring, you must have been doing a proper color coding of your potentiometers. Note that I always use red for power, black for ground, yellow/white for signals and other colors for other digital bus-like signals.

In this Instructable I am using the following:

- red: power, 5V
- black: ground or analog Vref. In the end Vref and ground are connected together at one point in the circuit that makes the digital noise affect as little as possible to the analog sound
- yellow: the gain value for the amplifiers
- white: the analog sensors or the input of a switch

You have to be careful in the Smapler because the potentiometers to control the gain -located at the circuit's front- use a red-yellow-black (power - signal - ground) connection, while the sensors use a white-black-red (signal - ground - power) one. If you happened to connect this wrong, you could burn a potentiometer because of a short-circuit. To check this, you just need to zoom in the picture.

You will also notice that the switches are only using two pins: signal and ground. This is so because we will use the internal pull-up resistors to save some wiring.