{"id":21798,"date":"2021-02-27T11:39:43","date_gmt":"2021-02-27T11:39:43","guid":{"rendered":"https:\/\/electropeak.com\/learn\/?p=21798"},"modified":"2021-06-19T09:19:51","modified_gmt":"2021-06-19T09:19:51","slug":"interfacing-mt8870-dtmf-decoder-module-with-arduino","status":"publish","type":"post","link":"https:\/\/electropeak.com\/learn\/interfacing-mt8870-dtmf-decoder-module-with-arduino\/","title":{"rendered":"Interfacing MT8870 DTMF Decoder Module with Arduino"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"21798\" class=\"elementor elementor-21798\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3a396c3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3a396c3\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a42d168\" data-id=\"a42d168\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2f9b121d elementor-widget elementor-widget-heading\" data-id=\"2f9b121d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">MT8870 DTMF Decoder Module Features <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-314433e3 elementor-widget elementor-widget-text-editor\" data-id=\"314433e3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>DTMF stands for Dual-tone-multi-frequency. This module is for sending signals using the voice-frequency band over telephone lines to switching centers. This module has two important applications: First, to specify the desired number to telecommunication through switching centers; second, it is capable of transmitting commands to these centers and other telecommunication devices.<\/p><p><strong>Technical specifications<\/strong>:<\/p><ul><li>Input voltage: 5V<\/li><li>5mm input jack<\/li><li>LED to indicate the binary outputs status<\/li><li>Recognize numbers 0-9, letters A-D and symbols *, #<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6db721b6 elementor-widget elementor-widget-image\" data-id=\"6db721b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Module.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-Module\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MDcsInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLU1vZHVsZS5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"560\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Module.jpg\" class=\"attachment-large size-large wp-image-21807\" alt=\"MT8870 DTMF Decoder Module\" srcset=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Module.jpg 600w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Module-429x400.jpg 429w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-581e1cf2 elementor-widget elementor-widget-heading\" data-id=\"581e1cf2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">MT8870 DTMF Decoder Module Pinout<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2016efa2 elementor-widget elementor-widget-text-editor\" data-id=\"2016efa2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This module has 6 pins:<\/p><ul><li><strong>VCC<\/strong>: Module power supply<\/li><li><strong>GND<\/strong>: Ground<\/li><li><strong>Q[1-4]:<\/strong> Binary Output<\/li><li><strong>EST: <\/strong>Early Steering (Output)<\/li><li><strong>INH:<\/strong> Inhibit (Input)<\/li><li><strong>TOE:<\/strong> Three State Output Enable (Input)<\/li><\/ul><p>You can see the pinout of this module here.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-125f9d8a elementor-widget elementor-widget-image\" data-id=\"125f9d8a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-Pinout\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MDgsInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLVBpbm91dC5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout.jpg\" class=\"attachment-large size-large wp-image-21808\" alt=\"MT8870 DTMF Decoder Module Pinout\" srcset=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout.jpg 800w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout-533x400.jpg 533w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout-400x300.jpg 400w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Pinout-768x576.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-31d556b elementor-widget elementor-widget-text-editor\" data-id=\"31d556b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Different modes in each pin represent different data. The following table shows different modes:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d9224f elementor-widget elementor-widget-image\" data-id=\"8d9224f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-State.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-State\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MDksInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLVN0YXRlLmpwZyJ9\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"400\" height=\"520\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-State.jpg\" class=\"attachment-large size-large wp-image-21809\" alt=\"\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f453dbb elementor-widget elementor-widget-heading\" data-id=\"f453dbb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Required Materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7f98be04 elementor-widget elementor-widget-image\" data-id=\"7f98be04\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Required-Materials.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-Required-Materials\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MTAsInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLVJlcXVpcmVkLU1hdGVyaWFscy5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"500\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Required-Materials.jpg\" class=\"attachment-large size-large wp-image-21810\" alt=\"\" srcset=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Required-Materials.jpg 600w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Required-Materials-480x400.jpg 480w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7754eeb5 elementor-widget elementor-widget-heading\" data-id=\"7754eeb5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Hardware Components<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-abe24a4 elementor-widget elementor-widget-html\" data-id=\"abe24a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"table-2\">\r\n<table width=\"100%\" class=\"zebra\">\r\n<tbody>\r\n\r\n<tr>\r\n\t<td width=\"70%\">Arduino UNO R3 \r\n<\/td>\r\n\t<td class=\"center\" width=\"10%\">\u00d7<\/td>\r\n    <td class=\"center\" width=\"10%\">1<\/td>\r\n\t<td class=\"center\" width=\"10%\"><a href=\"https:\/\/electropeak.com\/arduino-uno-r3-original\" target=\"_blank\"><i class=\"fa fa-shopping-cart\" style=\"\"><\/i><\/a><\/td>\r\n<\/tr>\r\n<tr>\r\n\t<td width=\"70%\">MT8870 DTMF Decoder Module\r\n<\/td>\r\n\t<td class=\"center\" width=\"10%\">\u00d7<\/td>\r\n    <td class=\"center\" width=\"10%\">1<\/td>\r\n\t<td class=\"center\" width=\"10%\"><a href=\"https:\/\/electropeak.com\/mt8870-dtmf-reciever-module\" target=\"_blank\"><i class=\"fa fa-shopping-cart\" style=\"\"><\/i><\/a><\/td>\r\n<\/tr>\r\n<tr>\r\n\t<td width=\"70%\">Male to Female Jumper wire \r\n<\/td>\r\n\t<td class=\"center\" width=\"10%\">\u00d7<\/td>\r\n    <td class=\"center\" width=\"10%\">1<\/td>\r\n\t<td class=\"center\" width=\"10%\"><a href=\"https:\/\/electropeak.com\/30cm-40p-male-to-female-jumper-wire\" target=\"_blank\"><i class=\"fa fa-shopping-cart\" style=\"\"><\/i><\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1d9c63 elementor-widget elementor-widget-heading\" data-id=\"d1d9c63\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Software Apps<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-740990bc elementor-widget elementor-widget-html\" data-id=\"740990bc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"table-2\">\r\n<table width=\"100%\" class=\"zebra\">\r\n<tbody>\r\n\r\n<tr>\r\n\t<td width=\"90%\">Arduino IDE<\/td>\r\n\t<td class=\"center\" width=\"10%\"><a href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\"><i class=\"fa fa-info\" style=\"\"><\/i><\/a><\/td>\r\n<\/tr>\r\n\r\n\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-67938bd6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"67938bd6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-7c88f9b1\" data-id=\"7c88f9b1\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-26bf8316 elementor-view-stacked elementor-widget__width-auto elementor-absolute elementor-shape-circle elementor-widget elementor-widget-icon\" data-id=\"26bf8316\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"icon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<div class=\"elementor-icon\">\n\t\t\t<i aria-hidden=\"true\" class=\"far fa-lightbulb\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7cb9669a elementor-widget elementor-widget-heading\" data-id=\"7cb9669a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">Note<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3429568d elementor-widget elementor-widget-text-editor\" data-id=\"3429568d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>You need an AUX cable to interface this module.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e02863a elementor-widget elementor-widget-heading\" data-id=\"3e02863a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Interfacing MT8870 DTMF Decoder Module with Arduino <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-18717549 elementor-widget elementor-widget-heading\" data-id=\"18717549\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Step 1: Circuit<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-23045b89 elementor-widget elementor-widget-text-editor\" data-id=\"23045b89\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The following circuit shows how you should connect MT8870 module to Arduino and to the mobile phone using the AUX cable. Connect wires accordingly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51c5e2e6 elementor-widget elementor-widget-image\" data-id=\"51c5e2e6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit-.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-Circuit\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MTEsInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLUNpcmN1aXQtLmpwZyJ9\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit-.jpg\" class=\"attachment-large size-large wp-image-21811\" alt=\"MT8870 Module Arduino circuit\" srcset=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit-.jpg 800w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit--533x400.jpg 533w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit--400x300.jpg 400w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-Circuit--768x576.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-662dcb54 elementor-widget elementor-widget-heading\" data-id=\"662dcb54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Step 2: Code<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6bd86ffc elementor-widget elementor-widget-text-editor\" data-id=\"6bd86ffc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Upload the following code to your Arduino.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2e1cc183 elementor-widget elementor-widget-html\" data-id=\"2e1cc183\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<pre class=\"line-numbers lang-arduino\"><code>   \/*\r\nMT8870-DTMF-Receiver-Module\r\nMade on 09 Feb, 2021\r\nhttps:\/\/electropeak.com\/learn\/\r\n\r\n*\/\r\n\r\nvoid setup() {\r\n  Serial.begin(9600);\r\n  pinMode(3, INPUT);\r\n  pinMode(4, INPUT);\r\n  pinMode(5, INPUT);\r\n  pinMode(6, INPUT);\r\n  pinMode(7, INPUT);\r\n}\r\n\r\nvoid loop() {\r\n  uint8_t number;\r\n  bool signal;\r\n  signal = digitalRead(7);\r\n  if (signal == HIGH)     \/*When DTMF tone is detected, STQ will read HIGH for the duration of the tone*\/\r\n  {\r\n    delay(100);\r\n    number = ( 0x00 | (digitalRead(3) &lt;&lt; 0) | (digitalRead(4) &lt;&lt; 1) | (digitalRead(5) &lt;&lt; 2) | (digitalRead(6) &lt;&lt; 3) );\r\n    switch (number)\r\n    {\r\n      case 0x01:\r\n        Serial.println(&quot;Pin Pressed: 1&quot;);\r\n        break;\r\n      case 0x02:\r\n        Serial.println(&quot;Pin Pressed: 2&quot;);\r\n        break;\r\n      case 0x03:\r\n        Serial.println(&quot;Pin Pressed: 3&quot;);\r\n        break;\r\n      case 0x04:\r\n        Serial.println(&quot;Pin Pressed: 4&quot;);\r\n        break;\r\n      case 0x05:\r\n        Serial.println(&quot;Pin Pressed: 5&quot;);\r\n        break;\r\n      case 0x06:\r\n        Serial.println(&quot;Pin Pressed: 6&quot;);\r\n        break;\r\n      case 7:\r\n        Serial.println(&quot;Pin Pressed: 7&quot;);\r\n        break;\r\n      case 0x08:\r\n        Serial.println(&quot;Pin Pressed: 8&quot;);\r\n        break;\r\n      case 0x09:\r\n        Serial.println(&quot;Pin Pressed: 9&quot;);\r\n        break;\r\n      case 0x0A:\r\n        Serial.println(&quot;Pin Pressed: 0&quot;);\r\n        break;\r\n      case 0x0B:\r\n        Serial.println(&quot;Pin Pressed: *&quot;);\r\n        break;\r\n      case 0x0C:\r\n        Serial.println(&quot;Pin Pressed: #&quot;);\r\n        break;\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ce0b762 elementor-widget elementor-widget-text-editor\" data-id=\"1ce0b762\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In this program, you can evaluate the performance of this module using the mobile keyboard. By touching each number 0 to 9 and also the # and * symbols, you can see them in the Serial Monitor.<\/p><p>The output is as follows:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-49894600 elementor-widget elementor-widget-image\" data-id=\"49894600\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-result.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"MT8870-result\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjE4MTIsInVybCI6Imh0dHBzOlwvXC9lbGVjdHJvcGVhay5jb21cL2xlYXJuXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIxXC8wMlwvTVQ4ODcwLXJlc3VsdC5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"563\" src=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-result.jpg\" class=\"attachment-large size-large wp-image-21812\" alt=\"\" srcset=\"https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-result.jpg 800w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-result-568x400.jpg 568w, https:\/\/electropeak.com\/learn\/wp-content\/uploads\/2021\/02\/MT8870-result-768x540.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>MT8870 DTMF Decoder Module Features DTMF stands for Dual-tone-multi-frequency. This module is for sending signals using the voice-frequency band over telephone lines to switching centers. This module has two important applications: First, to specify the desired number to telecommunication through switching centers; second, it is capable of transmitting commands to these centers and other telecommunication [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":21799,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[932],"tags":[4435],"platform":[1071],"bytype":[1075],"difficulty":[1077],"related_products":[4394],"class_list":["post-21798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sensors","tag-audio-music","platform-arduino","bytype-hookup-guides","difficulty-beginner","related_products-misc-04-012"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interfacing MT8870 DTMF Decoder Module with Arduino - Electropeak<\/title>\n<meta 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