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Arduino-Servo-Switch

This has the codes for the Servo examples including switching between tasks.

Introduction

These codes were put together to explore the best way to control servos. Example use is illustrated on the Arduino Hardware page on the Knowledgebase.

https://www.merg.org.uk/merg_wiki/doku.php?id=arduino:hardware

These codes use the IO_Abstraction library for task scheduling.

https://www.merg.org.uk/merg_wiki/doku.php?id=arduino:codeing:scheduling

Sweep

These examples are derived from a code on the Arduino site which shows how to make a servo sweep from one end of its range to the other and back again. This code can be obtained here:

http://www.arduino.cc/en/Tutorial/Sweep

This uses the hardware servo library <servo.h> which will be used throughout these examples.

These examples now have the heading code and version 1.0.0 unless otherwise noted.

Sweep with scheduling

sweepIOabs

This example uses the simple callback as in the case TCRT5000_IOAbs_Callback in Arduino-IR-Task. The callback handles the switching between moving the servo up and down.

Sweep with switching

The examples are extended to include switching when a signal is received from an IR detector.

switchIOAbs3

In this case there is one detector. When a signal is received the servo moves and while it is moving no further signal is processed. When the move is finished the servo returns to the start.

This features a more complex use of task scheduling where the movement of the servo is controlled from a task which can be switched on and off.

This is now working again (2022)

switch2IOAbs3

In this case there are two IR detectors and each controls the move in one of the directions.

Simple example of switching

diceEvent3

This is a simple example of the switching. It simulates a dice being rolled and checks for a particular result (3). When 10 successes have been achieved it stops.

This is included to help with understanding the operation of the other switching examples.

Requirements

All of these examples will run on an Arduino UNO. I have in fact used a NANO and a backplane which has more ground pins available. There is a need for a TCRT5000 IR detector and a servo and connecting wiring.

The Task scheduling examples require the library IO_Abstraction which is available from the Arduino IDE.

Library documentation is available from the links on the Knowledgebase.

Location

The local files are located at E:\GitHub\Arduino\Arduino-Servo-Switch

John Fletcher (M6777)