lu sheng
模拟量输入-电位器
Revision 0:1082d8e6442f, committed 2016-10-19
- Comitter:
- anywill
- Date:
- Wed Oct 19 13:49:54 2016 +0000
- Commit message:
- ?????potentiometer
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 1082d8e6442f main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Oct 19 13:49:54 2016 +0000
@@ -0,0 +1,28 @@
+//平台nucleo+mbed
+//实验内容:GPIO读取电位器电压
+//A0接电位器输出端 一端接3.3v 另一端接GND
+//注:由于电阻发热实际输入最大显示不了3300
+#include "mbed.h"
+
+AnalogIn analog_value(A0);//读取模拟值
+
+DigitalOut led(LED1); //D13 板载LED
+
+int main() {
+ float meas;
+
+ printf("\nAnalogIn example\n");
+
+ while(1) {
+ meas = analog_value.read(); // 转换并读取输入的模拟量 (value from 0.0 to 1.0)
+ meas = meas * 3300; // 将模拟量映射到 0 to 3300mv
+ printf("measure = %.0f mV\n", meas);
+ if (meas > 2000) { // 若输入电压大于2V则点亮LED
+ led = 1;
+ }
+ else {
+ led = 0;
+ }
+ wait(1); // 1s
+ }
+}
diff -r 000000000000 -r 1082d8e6442f mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Oct 19 13:49:54 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/25aea2a3f4e3 \ No newline at end of file