一.arduino
1.校准 ：当模拟量输入时，在初始化过程中确定模拟量的范围。检测到一个最大值，一个最小值。
int sensorMax=0；int sensorMin = 1023;
while (millis() < 5000) {
int sensorValue = analogRead(sensorPin);
if (sensorValue >sensorMax) {
sensorMax = sensorValue;}
if (sensorValue < sensorMin) {
sensorMin = sensorValue;}}
2.限定变量范围：constrain(x, 0, 255);
3.平滑取输入（10个值平均值，新值与前9个值）
int readings[numReadings];
void loop() {
total= total - readings[readIndex];
readings[readIndex] = analogRead(inputPin);
total= total + readings[readIndex];
readIndex = readIndex + 1;
if (readIndex >= numReadings)
readIndex = 0;
average = total / numReadings;}
