{"id":2384,"date":"2019-02-07T07:21:33","date_gmt":"2019-02-07T07:21:33","guid":{"rendered":"https:\/\/www.keithstestgarage.com\/?p=2384"},"modified":"2019-03-04T14:15:23","modified_gmt":"2019-03-04T14:15:23","slug":"analog-tester","status":"publish","type":"post","link":"https:\/\/www.keithstestgarage.com\/old\/2019\/02\/07\/analog-tester\/","title":{"rendered":"Analog Tester"},"content":{"rendered":"\n

Sometimes I need to read an analog value <\/em>but don’t want to tether to a computer, load the Arduino IDE, and open Serial Monitor.<\/p>\n\n\n\n

The solution involves an Arduino Pro Mini, a 4-segment display, a battery and some spring terminals, all hot melt glued to an AA battery pack. <\/span><\/p>\n\n\n\n

The spring terminals expose a GND, 5V, and 2x A0 inputs. This allows easy pairings of an analog device along with your preference of pull-up or pull-down resistor. <\/p>\n\n\n\n

Since the range of analog value readings is 0-1023, an inexpensive 4-digit display fits the bill perfectly. <\/p>\n\n\n\n

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Both A0 inputs go to the same A0 pin since that’s often hooked up to both the resistor and the analog device.<\/em><\/p>\n\n\n\n

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Now, I can test values of photo-resistors, electret mics, infrared diodes, potentiometers, and anything else that has an analog output suited for reading by an Arduino. <\/p>\n\n\n\n

Code<\/h2>\n\n\n\n

The code is very simple. <\/p>\n\n\n\n

First, install the library “TM1637 by Avishay Orpaz” <\/strong>through the Arduino IDE’s library manager:<\/p>\n\n\n\n

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TM1637 by Avishay Orpaz<\/figcaption><\/figure>\n\n\n\n

Or, get it from GitHub: https:\/\/github.com\/avishorp\/TM1637<\/a><\/p>\n\n\n\n

Arduino Sketch<\/h2>\n\n\n\n
\/\/ library:  https:\/\/github.com\/avishorp\/TM1637\n#include <TM1637Display.h> \n\n#define APIN A0 \/\/ Analog input pin\n#define CLK 5 \/\/ TM1637 CLK pin to D5\n#define DIO 4 \/\/ TM1637 DIO pin to D4\n\nTM1637Display display(CLK, DIO);\n\nvoid setup(){  \n  display.setBrightness(5); \/\/ range is 1 to 7\n}\n\nvoid loop(){\n  \/\/ read the analog value and display it\n  \/\/ (false indicates no leading zeroes)\n  display.showNumberDec(analogRead(APIN), false); \/\/ 0...1023\n  delay(100); \/\/ wait 100ms\n}<\/pre>\n\n\n\n
Parts & Links<\/h2>\n\n\n\n