This program controls a DC motor attached to the microcontroller via a transistor or relay. Adaptation to make the motor speed change by Ryan Holsopple.<\/p>\n
A simple version is at the bottom of the page<\/p>\n
<\/p>\n
\n\/*\n DC motor control\n by Ryan Holsopple\n \n modification of Tom Igoe's DC motor code \n I added function to start motor turning in one direction\n I raised the threshold for my pot to work\n **r.holsopple\n \n Created 8 Feb. 2006\n\n*\/\n\n\nint sensorValue = 0; \/\/ the variable to hold the analog sensor value\nint sensorPin = 0; \/\/ the analog pin with the sensor on it\nint motorPin = 9; \/\/ the digital pin with the motor on it\nint threshold = 300; \/\/ the theshold of the analog sensor below which the motor should turn on\nint forwardPin = 7;\nint backwardPin = 8;\n\n\/\/ prototype of the function that changes the motor's speed:\nvoid changeMotorSpeed();\n\n\/\/function to begin motor turning in one direction\nvoid forwardDirection();\n\nvoid setup() {\n \/\/ declare the inputs and outputs:\n pinMode(motorPin, OUTPUT);\n pinMode(forwardPin, OUTPUT);\n pinMode(backwardPin, OUTPUT);\n pinMode(sensorPin, INPUT);\n}\n\nvoid loop() {\n \/\/ read the analog sensor\n sensorValue = analogRead(sensorPin);\n \/\/ determine whether its above or below the threshold\n if (sensorValue > threshold) { \/\/ it's above the threshold\n \/\/ turn off the motor\n digitalWrite(motorPin, LOW);\n } \n else {\n \/\/start motor turning forward\n forwardDirection();\n \/\/ change the speed of the motor based on the sensor value:\n changeMotorSpeed();\n }\n}\n\n\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\nvoid forwardDirection(){\n digitalWrite (forwardPin, HIGH);\n digitalWrite (backwardPin, LOW);\n}\nvoid changeMotorSpeed() {\n analogWrite(motorPin, sensorValue);\n}\n\n<\/pre>\nThe simple version:<\/p>\n
\n\nint motorPin = 9; \/\/ where the transistor's base is attached\nint analogPin = 0; \/\/ Analog input number for the potentiometer\n\nint analogValue = 0; \/\/ variable for the analog reading\n\nvoid setup() {\npinMode(motorPin, OUTPUT);\n\n}\n\nvoid loop() {\n analogValue = analogRead(analogPin);\n \n if (analogValue > 512) {\n \/\/ turn the motor on\n digitalWrite(motorPin, HIGH);\n } else {\n \/\/ turn the motor off\n digitalWrite(motorPin, LOW);\n }\n\n}\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"This program controls a DC motor attached to the microcontroller via a transistor or relay. Adaptation to make the motor speed change by Ryan Holsopple.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-28","post","type-post","status-publish","format-standard","hentry","category-arduinowiring"],"_links":{"self":[{"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/posts\/28","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/comments?post=28"}],"version-history":[{"count":0,"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/posts\/28\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/media?parent=28"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/categories?post=28"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tigoe.com\/pcomp\/code\/wp-json\/wp\/v2\/tags?post=28"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}