SHARP GP2Y0A21YK0F 紅外線距離感測器 Analog 測距感測器 測量範圍10~80cm

商品說明

夏普 GP2Y0A21YK0F 紅外線距離感測器 測距感測器模組 測量範圍 10~80cm

SHARP GP2Y0A21YK0F Analog Distance Measuring Sensor Unit

• SHARP GP2Y0A21YK0F
• 距離測量範圍：10 ~ 80cm
• 輸出類型：類比電壓輸出
• 消耗電流： Typ. 30mA
• 電源電壓：4.5 ~ 5.5 V
• 應用：觸摸開關 (衛浴設備，照明控制等)、機器人清潔器、節能感測器(自動取款機、複印機、自動售貨機)、遊樂設備(街機遊戲機、機器人)

官方提供的資料 http://www.sharpsma.com/webfm_send/1489

Arduino 範例碼

int IRpin = 1;                                    // analog pin for reading the IR sensor

void setup() {
 Serial.begin(9600);                             // start the serial port
}

void loop() {
 float volts = analogRead(IRpin)*0.0048828125;   // value from sensor * (5/1024) - if running 3.3.volts then change 5 to 3.3
 float distance = 65*pow(volts, -1.10);          // worked out from graph 65 = theretical distance / (1/Volts)S 
 Serial.println(distance);                       // print the distance
 delay(100);                                     // arbitary wait time.
}

 

GP2Y0A21YK0F 紅外線距離感測器 是一種距離測量傳感器組件，由一個PSD (位置靈敏感測器)、IRED(紅外發光二極管) 和信號處理電路組成， 採用三角測量法：檢測距離不易受到，各種物體反射率，對環境的溫度和持續操作時間的影響。輸出的電壓對應檢測距離。因此，這種感測器也可以用來作為接近感測器。

Sharp GP2Y0A21YK0F Analog Distance Sensor 10-80cm

Overview

The Sharp distance sensors are a popular choice for many projects that require accurate distance measurements. This IR sensor is more economical than sonar rangefinders, yet it provides much better performance than other IR alternatives. Interfacing to most microcontrollers is straightforward: the single analog output can be connected to an analog-to-digital converter for taking distance measurements, or the output can be connected to a comparator for threshold detection. The detection range of this version is approximately 10 cm to 80 cm (4″ to 32″); a plot of distance versus output voltage is shown below.
The GP2Y0A21 uses a 3-pin JST connector that works with our 3-pin JST cables for Sharp distance sensors (not included) as shown in the upper picture on the right. It is also simple to solder three wires to the sensor where the connector pins are mounted (see the lower picture to the right). When looking at the back, the three connections from left to right are power, ground, and the output signal.

Feature summary

• operating voltage: 4.5 V to 5.5 V
• average current consumption: 30 mA (typical)
• distance measuring range: 10 cm to 80 cm (4″ to 32″)
• output type: analog voltage
• output voltage differential over distance range: 1.9 V (typical)
• response time: 38 ± 10 ms
• package size: 29.5×13.0×13.5 mm (1.16×0.5×0.53″)

• weight: 3.5 g (0.12 oz)

Linearizing the output

The relationship between the sensor’s output voltage and the inverse of the measured distance is approximately linear over the sensor’s usable range. The GP2Y0A21YK data sheet (374k pdf) contains a plot of analog output voltage as a function of the inverse of distance to a reflective object. You can use this plot to convert the sensor output voltage to an approximate distance by constructing a best-fit line that relates the inverse of the output voltage (V) to distance (cm). In its simplest form, the linearizing equation can be that the distance to the reflective object is approximately equal to a constant scale factor (~27 V*cm) divided by the sensor’s output voltage. Adding a constant distance offset and modifying the scale factor can improve the fit of this line.

Alternative Sharp Distance Sensors

We carry a longer-range version of this sensor as well: the Sharp GP2Y0A02YK0F analog distance sensor (20 – 150 cm). Both analog Sharp distance sensors have identical pin-outs and very similar packages, making it easy to swap one version for another should your application requirements change. We also sell a digital Sharp distance sensor, which has a very low minimum detection distance, quicker response time, lower current draw, and a much smaller package.

Note

The GP2Y0A21YK0F model is a lead-free (RoHS-compliant) version of the Sharp GP2Y0A21 Distance Sensor. The manufacturer recommends you insert a bypass capacitor of 10 uF or more between Vcc and GND near this sensor to stabilize your power supply line.