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Most escape room tech puzzles (and electronic systems in general) use digital inputs and outputs - those that can only have one of a discrete range of values: a button is either pressed or it is not pressed; a rotary switch can only be in one of a number of fixed positions; a maglock is either secured or it is open, etc. But, in this video, I'll describe how to create an Arduino-based escape room puzzle that uses analogue inputs and outputs - sliding linear potentiometers and ammeters that can express a smooth, continuous range of values, with an almost limitless degree of precision. These allow you to create puzzles that require a different sort of interesting interaction for players, but they do also present some interesting challenges - I'll cover some of the trickier aspects of using the built-in Arduino Analogue-To-Digital Converter (ADC) to convert analog input into a digital value, and how to use Pulse Width Modulation (PWM) on GPIO pins to control an analog output. Timings --- 00:00:00-00:00:13 Introduction 00:00:14-00:02:17 Puzzle Demonstration 00:02:18-00:04:40 Comparing Analog vs Digital signals 00:04:41-00:11:20 Retrieving Analog Input using "Ax" pins and the Arduino Analog-to-Digital Convertor (ADC) 00:11:21-00:18:49 Sending Analog Output using "~x" pins and Pulse Width Modulation (PWM) 00:18:50-00:23:20 Grounding, noise, and isolation of analog components 00:23:21-00:26:53 Wiring Diagram 00:26:54-00:51:40 Arduino Code 00:51:41-00:53:20 Wrap up Components Used --- 4x 1mA Ammeter, ~£2 each from https://www.aliexpress.com/item/10000... 4x Slide Potentiometer, buy 5 for $12 from https://www.banggood.com/custlink/vGG... Arduino UNO, $10 from https://amzn.to/2ZcuS82 4x LED ($0.01 each, from almost anywhere) 4x220 and 4x 4.7kohm resistors ($0.01 each, from almost anywhere) 5V 1-channel Relay Module, $2 from https://www.aliexpress.com/item/32905... Conductive Copper Strip, $5 for 3m from https://www.ebay.co.uk/itm/184340220340 Support Me! (or let me support you :) ) --- This video is made possible with the generous support of my Patreon donors - thankyou! For more details of this, and to access downloads, wiring diagrams, and additional resources and support for all my escape room technology projects, please go to / playfultech