LCD display thermometer circuit design

This paper introduces a new type of thermometer that uses DSl8820 to measure temperature and display with SMCl602A liquid crystal. Compared with other digital thermometers, this thermometer has the advantages of high measurement accuracy, simple circuit and easy observation.
1 Circuit principle The thermometer is roughly divided into three working processes. First, the current temperature is measured by the DS18B20 temperature sensor chip and the result is sent to the microcontroller. Then, the measured temperature reading sent by the 89C205I single-chip microcomputer chip is calculated and converted, and the result is sent to the liquid crystal display module. Finally, the SMC1602A chip will display the value sent on the display. The overall circuit diagram of the thermometer is shown in Figure 1.
Src="http://i.bosscdn.com/blog/20/17/56/163538478643.jpg" /> As can be seen from Figure 1, this circuit is mainly composed of DSl8820 temperature sensor chip, SMCl602A liquid crystal display Module chip and 89C2051 microcontroller chip. Among them, the DSI8B20 temperature sensor chip is connected to the single-chip microcomputer by “one-wire system”, which independently performs temperature measurement and sends the temperature measurement result to the work of the single chip microcomputer. The connection pin diagram of the DSl8820 is shown in Figure 2. <img alt=
SMCI602A liquid crystal display module chip is a liquid crystal display chip produced by Changsha Sunren Electronics Co., Ltd. The chip can display 16 × 2 characters, much more than the number of characters displayed in the previous seven-segment LED display. In addition, because SMCl602 chip programming is simple and intuitive, it is easier for users to operate and observe. The interface signals of the SMCl602A chip are listed in Table 1.
Src="http://i.bosscdn.com/blog/20/17/56/163552275234.jpg" /> 2 Software Design The program flow is shown in Figure 3. <img alt=
The data format of the DSl8B20 output is specifically illustrated in Figure 4, where MS represents the upper 8 bits of the data and LS represents the lower 8 bits of the data. Since the temperature is a positive temperature above 0 °C and a negative temperature below 0 °C, the positive and negative numbers must be discriminated before the conversion, and then converted.
Src="http://i.bosscdn.com/blog/20/17/56/16367231983.jpg" /> When S=0, it means a positive number; when S=1, it means a negative number. For negative numbers, the "first inversion plus one" is used in the processing. The method of converting the complement to the original code. At the same time, in order to improve the measurement accuracy, the DSl8820 adopts a 12-bit data conversion method, in which the sign bit occupies 1 bit, the integer occupies 7 bits, and the decimal number occupies 4 bits. Therefore, in calculation and processing, integers and decimals must also be processed separately. After the "rounding" of the percentile data, the temperature can be displayed from -99 °C to 99.9C. </p> </div> <div class="tech-detail-share"> <!-- Baidu Button BEGIN --> <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(

Led Screen


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