Welcome to Raspbot V2 repository

07.Tracking module status printing

1. Learning objectives

Read and print the status of the four-way patrol module.

2. Experimental preparation

2.1 Wiring

As shown in the figure below, connect the four-way patrol module to the expansion board.

2.2 Debugging the four-way patrol module

(1) Place the four-way patrol module on a white paper or other white background.

(2) Place the first probe above the black line and adjust the knob to make the indicator light on.

(3) Then continue to adjust the second and third probes and adjust the knob to make the indicator light on. Similarly, debug the fourth probe

Finally, the indicator light is on when the probe is above the black line, and off when the probe is not above the black line.

3. Core code analysis

Raspbot_Lib library function required to read the status of the four-way patrol module:

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hsla(0, 0%, 100%, 0)); \\r\\n}\\r\\n\\n\\n\\n\u003C\u002Fstyle\u003E\u003Cstyle\u003Eol { list-style-type: decimal !important; }ul { list-style-type: disc !important; }\u003C\u002Fstyle\u003E\u003C!doctype html\u003E\\n\u003Chtml\u003E\\n\u003Chead\u003E\\n\u003Cmeta charset='UTF-8'\u003E\u003Cmeta name='viewport' content='width=device-width initial-scale=1'\u003E\\n\\n\u003Clink href='https:\u002F\u002Ffonts.loli.net\u002Fcss?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext' rel='stylesheet' type='text\u002Fcss' \u002F\u003E\u003Ctitle\u003E7.Tracking module status printing\u003C\u002Ftitle\u003E\\n\u003C\u002Fhead\u003E\\n\u003Cbody class='typora-export os-windows'\u003E\u003Cdiv class='typora-export-content'\u003E\\n\u003Cdiv id='write'  class=''\u003E\u003Ch3 id='07tracking-module-status-printing'\u003E\u003Cspan\u003E07.Tracking module status printing\u003C\u002Fspan\u003E\u003C\u002Fh3\u003E\u003Cdiv class='md-toc' mdtype='toc'\u003E\u003Cp class=\\\"md-toc-content\\\" role=\\\"list\\\"\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h3\\\" data-ref=\\\"n0\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#07tracking-module-status-printing\\\"\u003E07.Tracking module status printing\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h4\\\" data-ref=\\\"n3\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#1-learning-objectives\\\"\u003E1. Learning objectives\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h4\\\" data-ref=\\\"n5\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#2-experimental-preparation\\\"\u003E2. Experimental preparation\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h5\\\" data-ref=\\\"n6\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#21-wiring\\\"\u003E2.1 Wiring\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h5\\\" data-ref=\\\"n9\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#22-debugging-the-four-way-patrol-module\\\"\u003E2.2 Debugging the four-way patrol module\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h4\\\" data-ref=\\\"n19\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#3-core-code-analysis\\\"\u003E3. Core code analysis\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003Cspan role=\\\"listitem\\\" class=\\\"md-toc-item md-toc-h4\\\" data-ref=\\\"n26\\\"\u003E\u003Ca class=\\\"md-toc-inner\\\" href=\\\"#4-experimental-phenomenon\\\"\u003E4. Experimental phenomenon\u003C\u002Fa\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fdiv\u003E\u003Ch4 id='1-learning-objectives'\u003E\u003Cspan\u003E1. Learning objectives\u003C\u002Fspan\u003E\u003C\u002Fh4\u003E\u003Cp\u003E\u003Cspan\u003ERead and print the status of the four-way patrol module.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Ch4 id='2-experimental-preparation'\u003E\u003Cspan\u003E2. Experimental preparation\u003C\u002Fspan\u003E\u003C\u002Fh4\u003E\u003Ch5 id='21-wiring'\u003E\u003Cspan\u003E2.1 Wiring\u003C\u002Fspan\u003E\u003C\u002Fh5\u003E\u003Cp\u003E\u003Cspan\u003EAs shown in the figure below, connect the four-way patrol module to the expansion board.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002Fw1.png\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Ch5 id='22-debugging-the-four-way-patrol-module'\u003E\u003Cspan\u003E2.2 Debugging the four-way patrol module\u003C\u002Fspan\u003E\u003C\u002Fh5\u003E\u003Cp\u003E\u003Cspan\u003E(1) Place the four-way patrol module on a white paper or other white background.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002F0.png\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cspan\u003E(2) Place the first probe above the black line and adjust the knob to make the indicator light on.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002F1.jpg\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cspan\u003E(3) Then continue to adjust the second and third probes and adjust the knob to make the indicator light on. Similarly, debug the fourth probe\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002F2.jpg\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002F4.png\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cspan\u003EFinally, the indicator light is on when the probe is above the black line, and off when the probe is not above the black line.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp\u003E\u003Cimg src=\\\"http:\u002F\u002Fwww.yahboom.net\u002Fpublic\u002Fupload\u002Fupload-html\u002F1725433987\u002F5.jpg\\\" referrerpolicy=\\\"no-referrer\\\" loading=\\\"lazy\\\"\u003E\u003C\u002Fp\u003E\u003Ch4 id='3-core-code-analysis'\u003E\u003Cspan\u003E3. Core code analysis\u003C\u002Fspan\u003E\u003C\u002Fh4\u003E\u003Cp\u003E\u003Cspan\u003ERaspbot_Lib library function required to read the status of the four-way patrol module:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cpre class=\\\"md-fences md-end-block ty-contain-cm modeLoaded\\\" spellcheck=\\\"false\\\" lang=\\\"\\\"\u003E\u003Cdiv class=\\\"CodeMirror cm-s-inner cm-s-null-scroll CodeMirror-wrap\\\" lang=\\\"\\\"\u003E\u003Cdiv style=\\\"overflow: hidden; position: relative; width: 3px; height: 0px; top: 9.52344px; left: 8px;\\\"\u003E\u003Ctextarea autocorre\",\"videotype\":2,\"videoname_1\":\"`\u003Ciframe width=\\\"600\\\" height=\\\"420\\\" src=\\\"https:\u002F\u002Fwww.youtube.com\u002Fembed\u002F9kvBhZ6V91k\\\" title=\\\"Yahboom Raspbot V2 Robot Car - 1 7 4 channel tracking module status\\\" frameborder=\\\"0\\\" allow=\\\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\\\" referrerpolicy=\\\"strict-origin-when-cross-origin\\\" allowfullscreen\u003E\u003C\u002Fiframe\u003E`\",\"videoname_2\":\"``\",\"videoname_3\":\"``\",\"videoname_4\":\"``\",\"videoname_5\":\"``\",\"videoname_6\":\"``\",\"newimg\":0,\"dataurl\":\"\",\"customurl\":\"\",\"documentation_switch\":\"1\",\"classificationid\":0,\"paixu\":0,\"adddate\":\"1725433807\",\"updated_at\":\"2026-09-28 16:24:57\",\"productCname\":\"RASPBOT-V2\",\"productName\":\"Raspbot V2\"},\"video\":[[\"\",\"\u003Ciframe width=\\\"600\\\" height=\\\"420\\\" src=\\\"https:\u002F\u002Fwww.youtube.com\u002Fembed\u002F9kvBhZ6V91k\\\" title=\\\"Yahboom Raspbot V2 Robot Car - 1 7 4 channel tracking module status\\\" frameborder=\\\"0\\\" allow=\\\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\\\" referrerpolicy=\\\"strict-origin-when-cross-origin\\\" allowfullscreen\u003E\u003C\u002Fiframe\u003E\",\"\",\"\"]],\"forbidden\":false}}}"</script>
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