2 digit 7 segment 0-99 counting with arduino两位7段数码管计数器：
http://fritzing.org/projects/2-digit-7-segment-0-99-counting-with-arduino/

simple ldr最简单的Ledong环境光测试仪：
http://fritzing.org/projects/simple-ldr/
the code：
// simple ldr sensor
// connected to analog in 0

int senseur=0;

void setup(){
Serial.begin(9600);
}

void loop(){
int val=analogRead(senseur);
Serial.println(val);
delay(100);
}

Thermistor output to LCD液晶温度计：
http://fritzing.org/projects/thermistor-output-to-lcd/

Fade Between Two LEDs两个LED灯交替闪烁：
http://fritzing.org/projects/fade-between-two-leds/

Thermistor热敏电阻：
http://fritzing.org/projects/analog-input-thermistor/