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Sparkfun系列 美國原裝 LIDAR-Lite v3、Arduino 雷射測距模組 ( SEN-14032)
INTRODUCTION
It’s back! This is the LIDAR-Lite v3, a compact, high-performance optical distance measurement sensor from Garmin™. When space and weight requirements are tight, the LIDAR-Lite v3 soars. The LIDAR-Lite v3 is the ideal solution for drone, robot or unmanned vehicle applications.
This easy-to-use 40-meter laser-based optical ranging sensor has all the core features that made the LIDAR-Lite v2 so popular. Small in form and light in weight with low power consumption of less than 130mA during an acquisition. And it’s user-configurable so you can adjust between accuracy, operating range and measurement time.
Each LIDAR-Lite v3 features an edge-emitting, 905nm (1.3 watts), single-stripe laser transmitter, 4 m Radian x 2 m Radian beam divergence, and an optical aperture of 12.5mm. The third version of the LIDAR-Lite still operates at 5V DC with a current consumption rate of <100mA at continuous operation. On top of everything else, the LIDAR-Lite is user-configurable, allowing adjustment between accuracy, operating range and measurement time. It can be interfaced via I2C or PWM with the included 200mm accessory cable.
Note: CLASS 1 LASER PRODUCT CLASSIFIED EN/IEC 60825-1 2014. This product is in conformity with performance standards for laser products under 21 CFR 1040, except with respect to those characteristics authorized by Variance Number FDA-2016-V-2943 effective September 27, 2016.
Features
- Range: 0-40m Laser Emitter
- Accuracy: +/- 2.5cm at distances greater than 1m
- Power: 4.75–5V DC; 6V Max
- Current Consumption: 105mA idle; 130mA continuous
- Rep Rate: 1–500Hz
- Laser Wave Length/Peak Power: 905nm/1.3 watts
- Beam Divergence: 4m Radian x 2m Radian
- Optical Aperture: 12.5mm
- Interface: I2C or PWM
- 20 x 48 x 40 mm (0.8 x 1.9 x 1.6 inches)
Documents
Hardware Overview
Differences Between v3 and v3HP
Functionally, the LIDAR-Lite v3 and LIDAR-Lite v3HP are quite similar. The primary differences are listed here:
| Specs | LIDAR-Lite v3 | LIDAR-Lite v3HP |
| Update Rate | 500 Hz | > 1kHz |
| 消耗電流（閒置）
Current Consumption (idle) | 105 mA | 65 mA |
| 消耗電流（購置）
Current Consumption (acquisition) | 130 mA | 85 mA |
| Casing | None | IPX7 rated casing |
Note: An IPX7 rating means that the body of this device can withstand incidental exposure to water of up to 1meter for up to 30 minutes. The bare wire portion of the wiring harness is not water resistant. All bare wire connections must either be made in a water tight location or properly sealed.
說明：https://learn.sparkfun.com/tutorials/lidar-lite-v3-hookup-guide?_ga=2.244750726.2032197004.1529903910-2007213171.1517364630
案件
LIDAR-Lite在前面有兩個管子，包含一個發射器（激光器）和接收器。你會想要面對你的目標。
此步驟僅適用於LIDAR-Lite v3：
在側面，您會發現連接到隨附的6線電纜的電氣端口。將線束插入端口以分離引腳。
在背面，您會發現4個安裝孔，用於安裝＃6或M3.5螺釘或螺栓。
電線：LIDAR-Lite有6根導線可用於與傳感器進行通信。
注意： 這是看單位的背面
| 顏色 | 銷 | 描述 |
| 紅 | 5V | 電源（5V） |
| 橙子 | PWR EN | 電源啟用（內部上拉） |
| 黃色 | 模式 | 模式控制（用於PWM模式） |
| 綠色 | SCL | 我2 C時鐘 |
| 藍色 | SDA | I 2 C數據 |
| 黑色 | GND | 地面 |
功率：LIDAR-Lite v3以及LIDAR-Lite v3HP設備都需要4.5V至5.5V的直流電源（標稱值為5V）。LIDAR-LITE v3在連續工作時可以吸收135 mA的電流（怠速時為105 mA）。相反，v3HP單元在連續工作期間（怠速時為65 mA）吸收高達85 mA的電流。為了保持電平電壓，Garmin建議在電源（5V）和地（GND）之間放置一個680μF電容，盡可能靠近LIDAR單元。
⚡ 請注意電流消耗的差異！請注意，雖然LIDAR-Lite v3和v3HP的輸入電壓相同，但電流消耗不同
硬件組裝
按照下圖將LIDAR單元連接到RedBoard或其他Arduino兼容板。LIDAR-Lite可以通過I 2 C 進行通信，也可以使用脈寬調製（PWM）信號來表示測量距離。在本指南中，我們將展示如何使用I 2 C與LIDAR單元進行通信。
注意： Garmin建議使用680μF，但接近該值的任何東西都可以使用。在這個例子中，我使用了一個1000μF的電容。確保將電解電容正確添加到電路中，因為它具有極性。
