Digital voltmeter designed by single chip microcomputer, including circuit diagram, hardware connection, source program

Single chip microcomputer STM32L151CCU6

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

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1. Experimental task

Using a single-chip AT89S51 and ADC0809 to design a digital voltmeter, it can measure the DC voltage value between 0-5V, four-digit digital display, but the minimum number of components required

2. Circuit schematic

$Src="http://i.bosscdn.com/blog/nophoto.gif" /></p><p>3. Hardware connection on the system board a) Connect the P1.0-P1.7 in the "SCM System" area to the ABCDEFGH port in the "Dynamic Digital Display" area with an 8-core cable. b) Connect the P2.0-P2.7 in the "SCM System" area to the S1S2S3S4S5S6S7S8 port in the "Dynamic Digital Display" area with an 8-pin cable. c) Connect the P3.0 in the "Single-Chip System" area to the ST terminal in the "Analog-to-Digital Converter Module" area. d) Connect the P3.1 in the "Single-Chip System" area to the OE terminal in the "Analog-to-Digital Converter Module" area. e) Connect the P3.2 in the "SCM System" area to the EOC terminal in the "Analog-to-Digital Converter Module" area. f) Connect the P3.3 in the "SCM System" area to the CLK terminal in the "Analog-to-Digital Converter Module" area with wires. g) Connect the A2A1A0 terminal in the "Analog-to-Digital Converter Module" area to the GND terminal in the "Power Module" area. h) Connect the IN0 terminal in the â€œAnalog-to-Digital Converter Moduleâ€ area to the VR1 terminal in the â€œThree-way Adjustable Voltage Moduleâ€ area. i) Connect the P0.0-P0.7 in the "Microcontroller System" area to the D0D1D2D3D4D5D6D7 terminal in the "Analog-to-Digital Converter Module" area with an 8-pin cable. </p><p>For information on designing digital voltmeters, see the PDF document</p> </div> </div> <div class="tech-detail-share">  <div class="bdsharebuttonbox"> <a href="#" class="bds_qzone" data-cmd="qzone" title="Share to QQ Space"></a> <a href="#" class=" Bds_tsina" data-cmd="tsina" title="Share to Sina Weibo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"> </a> <span>Share to:</span> </div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": " 1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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