通过LCN系列液位传感器测量水位,传送信号给单片机STC89c52,提前设定阈值为200ml,当水位高于阈值,控制电磁阀2打开,电磁阀1关闭,当水位低于阈值,控制电磁阀3打开,电磁阀2关闭,电磁阀1关闭,如何使用Verilog实
时间: 2023-10-01 08:05:54 浏览: 129
基于AT89C52单片机的液位检测系统
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现在,让我们来看看如何使用Verilog实现上述功能。
首先,我们需要定义输入和输出端口,以及内部信号。我们需要将液位传感器的信号(水位高/低)作为输入,将电磁阀1、2、3的控制信号作为输出。还需要定义一个阈值(200ml)作为内部参数。
```verilog
module water_level(
input high_low, // 液位传感器信号
output valve1, // 电磁阀1控制信号
output valve2, // 电磁阀2控制信号
output valve3 // 电磁阀3控制信号
);
reg [7:0] threshold = 200; // 阈值
// 内部信号
reg high; // 水位高
reg low; // 水位低
// 实现代码
endmodule
```
接下来,我们要编写实现代码,根据输入信号和阈值控制输出信号:
```verilog
always @(high_low) begin
if (high_low) begin
high <= 1;
low <= 0;
end else begin
high <= 0;
low <= 1;
end
end
always @(*) begin
if (high && valve2 == 0) begin
valve1 <= 0;
valve2 <= 1;
valve3 <= 0;
end else if (low && valve3 == 0) begin
valve1 <= 0;
valve2 <= 0;
valve3 <= 1;
end else if (valve2 == 1) begin
valve1 <= 0;
valve2 <= 1;
valve3 <= 0;
end else if (valve3 == 1) begin
valve1 <= 0;
valve2 <= 0;
valve3 <= 1;
end else begin
valve1 <= 1;
valve2 <= 0;
valve3 <= 0;
end
end
```
在第一个always块中,我们根据输入信号(高/低)设置内部信号。在第二个always块中,我们根据内部信号和控制信号的状态,设置输出信号。
最后,我们需要编写测试代码,模拟液位传感器的输入信号,并验证输出信号是否符合预期:
```verilog
module water_level_testbench;
// 实例化被测试的模块
water_level dut (
.high_low(high_low),
.valve1(valve1),
.valve2(valve2),
.valve3(valve3)
);
// 定义输入信号
reg high_low;
// 定义输出信号
wire valve1;
wire valve2;
wire valve3;
// 模拟输入信号
initial begin
high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 high_low = 1;
#10 high_low = 0;
#10 $finish;
end
// 验证输出信号
always @(valve1, valve2, valve3) begin
$display("valve1 = %b, valve2 = %b, valve3 = %b", valve1, valve2, valve3);
end
endmodule
```
在测试代码中,我们模拟了一系列的输入信号,并在每次输入信号改变时打印输出信号。我们可以通过观察输出信号来验证水位控制是否正确。
以上就是使用Verilog实现水位控制的全部过程。
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