【正文】 .................17 LCD Module flow chart ...........................................................................17 Clock Module flow chart..........................................................................18 Programming ....................................................................................................18 LCD circuit part of the subroutine ...........................................................19 AD part of the subroutine .........................................................................19 Clock module part of the subroutine .......................................................19 2 Conclusions ...............................................................................................................19 Acknowledgements ...................................................................................................20 References..................................................................................................................21 Hardware circuit diagram ......................................................................................22 Design System part of the source code in Appendix ...........................................24 3 第 1 章 需求分析 目前煤礦產(chǎn)業(yè)的發(fā)展概況 我國瓦斯產(chǎn)業(yè)發(fā)展現(xiàn)狀 ,2020 年 ,全國瓦斯抽采 億立方米 ,利用 億立方米。s national standards with international standards and given the mon curve of electric energy detonating detonation curves of voltage and current, voltage and current curves of inductance capacitance detonated detonated to these curves, and then refer to the insurance factor of times, people will determine in relation to certain types of gas, electrical energy to the limits specified circuit example, involves IIC gases (such as hydrogen), the standard 24VDC loop power supply (such as the aspiration, electrical switches, solenoid valves, etc.) are usually limited to pressure to set a value of so check the voltage and current limit values of detonation pressure curve, and consider the safety factor of times, can be determined at this time of the limit value can be determined at this time current limit value should be limit pressure value by taking into account the safety factor of times the capacitor voltage after the investigation detonated curve to determine the circuit capacitance value should be limited to to 119mA current limit and to consider the safety factor of times the current of inductor detonated after the search curve to determine the loop inductance value should be limited to on 51 puters gas concentration monitoring system, you can set the gas concentration limit, the buzzer alarm when the concentration exceeds the limit, to the purpose of accident prevention。 基于 51 系列單片機的瓦斯?jié)舛缺O(jiān)測系統(tǒng) ,可以設(shè)置瓦斯?jié)舛壬舷?,當(dāng)濃度超過上限蜂鳴器報警 ,達(dá)到預(yù)防事故的目的；還添加了時間顯示的功能 ,時間參數(shù)可調(diào)。 例如 ,涉及 IIC 類氣體 (如氫氣 )時 ,對標(biāo)準(zhǔn)24VDC 供電的回路 (如變送氣 ,電氣轉(zhuǎn)換器 ,電磁閥等 )通常設(shè)定限壓值為 28V。如果我們在工作中處處按照標(biāo)準(zhǔn)、規(guī)程作業(yè) ,把事故降低到最低甚至是實現(xiàn)零事故。 摘 要 我國當(dāng)前煤炭能源的開采和利用一直占到重要地位 ,在相當(dāng)長時期內(nèi)仍將是我國的主要能源。 人們普遍認(rèn)為 ,煤礦企業(yè)屬于高危險行業(yè) ,發(fā)生事故是必然的 ,不發(fā)生事故是偶然的。根據(jù)這些曲線 ,再參考 倍的保險系數(shù) ,人們便可以確定在涉及某類氣體時 ,對指定回路的電能量限制參數(shù) 。依 119mA 限流值并考慮 倍的保險系數(shù)后查電流電感引爆曲線 ,可確定回路電感值應(yīng)限制在 。 in the vast majority of serious accidents due to gas explosion, about 70% of the total number of serious accidents the prevention and reduction of accidents that end, coal mine gas monitoring system for monitoring alarm gas exploitation to ensure the safety of coal production. People generally believe that coal panies are highrisk industries, the incident was inevitable, not the incident was we are at work everywhere in accordance with the standard operating procedures, the incidents to a minimum or even zero practice, people use spark experimental apparatus, through experiments on the different risk categories of restrictions on parameters of electric energy 39。 主要模塊硬件設(shè)計 .......................................... 6 單片機部分的設(shè)計 .................................... 7 液晶電路部分的設(shè)計 .................................. 9 AD 部分的設(shè)計 ...................................... 11 時鐘模塊部分的設(shè)計 ................................. 13 按鍵部分的設(shè)計 ..................................... 15 蜂鳴器部分的設(shè)計 .................................