Analog and Digital I/O Quiz 4 PDF
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This document discusses the fundamental differences between analog and digital input/output (I/O) systems and details various input and output devices with examples. It explains the typical applications of these systems, including force sensors, potentiometers, light sensors, vision sensors, conveyor belts, relays as well as other control valves, lighting and audio alarms, focusing on their practical roles in robotic systems and related areas.
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**[The Basic Difference Between Analog and Digital I/O]** - Analog I/O is used when you need to detect or control an event which involves a range of values. - Digital I/O is used when you need to detect or control an event which is binary (yes/no, on/off). #### **[Analog Input Devices...
**[The Basic Difference Between Analog and Digital I/O]** - Analog I/O is used when you need to detect or control an event which involves a range of values. - Digital I/O is used when you need to detect or control an event which is binary (yes/no, on/off). #### **[Analog Input Devices]** - **Force Sensors** --- [[Either attached to the robot]](http://robotiq.com/products/robotics-force-torque-sensor/) or fixed elsewhere, these measure the magnitude of forces applied to them as an analog value. - **Potentiometers** --- These are used for a variety of applications, from simple control knobs to detecting the position of a motor. - **Light sensors** --- These can be single or multi-color sensors. They detect the amount of light hitting them and are used in photoelectric part detection sensors to measure the distance to objects. - **Vision sensors** --- These are analog input devices as they measure the amount of light hitting a sensor. ### **[Analog Output Devices]** - **Conveyor belt motor speed** --- For advanced conveyor applications, the speed of the belt can be integrated into the robot controller. - **Analog control valves** --- When a fluid is involved in a process, analog control valves are a way to precisely control the amount of fluid which is released. These are used in hydraulics. - **Lamp brightness** --- The brightness of an LED or lamp can be set precisely. ### **[Digital Input Devices]** - **Limit switches** --- Detecting when a safety door is opened or when a robot reaches an external limit. - **Basic part detection sensors** --- Detect when an object is present. - **Single-beam laser safety sensors** --- Used in safety curtains, these sensors detect when a laser beam is broken, to indicate that someone has entered an unsafe area. - **Push buttons** --- A simple but important sensor. Push buttons are an effective way to start or stop a pre-programmed sequence. ### **[Digital Output Devices]** - **Relays** --- These are electronically controllable switches, which allow high-power circuits to be operated by low-power electronics. - **Warning lights** --- Often used in circuits with safety sensors, these can be switched on to show that a robot is in operation and workers should not enter the area. - **Conveyor on/off** --- A simpler way of controlling conveyor belts than speed control is just to allow the robot controller to activate the belt. - **Audio alarms** --- Like warning lights, these are often used to indicate that a safety-related event has occurred.
