vl53l1xで距離測定


# はじめに
vl53l1xという距離センサを使いました
githubからソースコードを引っ張ってくる
https://github.com/openmv/openmv/blob/master/scripts/libraries/vl53l1x.py
上記の内容はめちゃくちゃ長いので一応、一番下に書いときます

この記事では以下の環境で動作確認をしております。
MicroPython：v1.14
ハードウェア：ESP-WROOM-32

# 実行コード
上記のプログラムをいれた後に下記のコードで実行する
```get.py
import time
from machine import I2C,Pin
from vl53l1x import VL53L1X

""" パラメータ """
I2C_SCL_PIN = 22  #自分で指定
I2C_SDA_PIN = 21  #自分で指定
""" パラメータ(終わり) """
i2c = I2C(scl=Pin(I2C_SCL_PIN), sda=Pin(I2C_SDA_PIN))

distance = VL53L1X(i2c) #20mm~400mm
while True:
    print("range: mm ", distance.read())
    time.sleep_ms(50)
```
# 結果
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/2298143/359a87b0-317a-d391-60fb-29847508c060.png)


手を近づけると値が小さくなり離すと大きくなります。
検知範囲は20cm~400cmで安定します

# ソースコード
```vl53l1x.py
import machine

VL51L1X_DEFAULT_CONFIGURATION = bytes([
0x00, # 0x2d : set bit 2 and 5 to 1 for fast plus mode (1MHz I2C), else don't touch */
0x00, # 0x2e : bit 0 if I2C pulled up at 1.8V, else set bit 0 to 1 (pull up at AVDD) */
0x00, # 0x2f : bit 0 if GPIO pulled up at 1.8V, else set bit 0 to 1 (pull up at AVDD) */
0x01, # 0x30 : set bit 4 to 0 for active high interrupt and 1 for active low (bits 3:0 must be 0x1), use SetInterruptPolarity() */
0x02, # 0x31 : bit 1 = interrupt depending on the polarity, use CheckForDataReady() */
0x00, # 0x32 : not user-modifiable */
0x02, # 0x33 : not user-modifiable */
0x08, # 0x34 : not user-modifiable */
0x00, # 0x35 : not user-modifiable */
0x08, # 0x36 : not user-modifiable */
0x10, # 0x37 : not user-modifiable */
0x01, # 0x38 : not user-modifiable */
0x01, # 0x39 : not user-modifiable */
0x00, # 0x3a : not user-modifiable */
0x00, # 0x3b : not user-modifiable */
0x00, # 0x3c : not user-modifiable */
0x00, # 0x3d : not user-modifiable */
0xff, # 0x3e : not user-modifiable */
0x00, # 0x3f : not user-modifiable */
0x0F, # 0x40 : not user-modifiable */
0x00, # 0x41 : not user-modifiable */
0x00, # 0x42 : not user-modifiable */
0x00, # 0x43 : not user-modifiable */
0x00, # 0x44 : not user-modifiable */
0x00, # 0x45 : not user-modifiable */
0x20, # 0x46 : interrupt configuration 0->level low detection, 1-> level high, 2-> Out of window, 3->In window, 0x20-> New sample ready , TBC */
0x0b, # 0x47 : not user-modifiable */
0x00, # 0x48 : not user-modifiable */
0x00, # 0x49 : not user-modifiable */
0x02, # 0x4a : not user-modifiable */
0x0a, # 0x4b : not user-modifiable */
0x21, # 0x4c : not user-modifiable */
0x00, # 0x4d : not user-modifiable */
0x00, # 0x4e : not user-modifiable */
0x05, # 0x4f : not user-modifiable */
0x00, # 0x50 : not user-modifiable */
0x00, # 0x51 : not user-modifiable */
0x00, # 0x52 : not user-modifiable */
0x00, # 0x53 : not user-modifiable */
0xc8, # 0x54 : not user-modifiable */
0x00, # 0x55 : not user-modifiable */
0x00, # 0x56 : not user-modifiable */
0x38, # 0x57 : not user-modifiable */
0xff, # 0x58 : not user-modifiable */
0x01, # 0x59 : not user-modifiable */
0x00, # 0x5a : not user-modifiable */
0x08, # 0x5b : not user-modifiable */
0x00, # 0x5c : not user-modifiable */
0x00, # 0x5d : not user-modifiable */
0x01, # 0x5e : not user-modifiable */
0xdb, # 0x5f : not user-modifiable */
0x0f, # 0x60 : not user-modifiable */
0x01, # 0x61 : not user-modifiable */
0xf1, # 0x62 : not user-modifiable */
0x0d, # 0x63 : not user-modifiable */
0x01, # 0x64 : Sigma threshold MSB (mm in 14.2 format for MSB+LSB), use SetSigmaThreshold(), default value 90 mm  */
0x68, # 0x65 : Sigma threshold LSB */
0x00, # 0x66 : Min count Rate MSB (MCPS in 9.7 format for MSB+LSB), use SetSignalThreshold() */
0x80, # 0x67 : Min count Rate LSB */
0x08, # 0x68 : not user-modifiable */
0xb8, # 0x69 : not user-modifiable */
0x00, # 0x6a : not user-modifiable */
0x00, # 0x6b : not user-modifiable */
0x00, # 0x6c : Intermeasurement period MSB, 32 bits register, use SetIntermeasurementInMs() */
0x00, # 0x6d : Intermeasurement period */
0x0f, # 0x6e : Intermeasurement period */
0x89, # 0x6f : Intermeasurement period LSB */
0x00, # 0x70 : not user-modifiable */
0x00, # 0x71 : not user-modifiable */
0x00, # 0x72 : distance threshold high MSB (in mm, MSB+LSB), use SetD:tanceThreshold() */
0x00, # 0x73 : distance threshold high LSB */
0x00, # 0x74 : distance threshold low MSB ( in mm, MSB+LSB), use SetD:tanceThreshold() */
0x00, # 0x75 : distance threshold low LSB */
0x00, # 0x76 : not user-modifiable */
0x01, # 0x77 : not user-modifiable */
0x0f, # 0x78 : not user-modifiable */
0x0d, # 0x79 : not user-modifiable */
0x0e, # 0x7a : not user-modifiable */
0x0e, # 0x7b : not user-modifiable */
0x00, # 0x7c : not user-modifiable */
0x00, # 0x7d : not user-modifiable */
0x02, # 0x7e : not user-modifiable */
0xc7, # 0x7f : ROI center, use SetROI() */
0xff, # 0x80 : XY ROI (X=Width, Y=Height), use SetROI() */
0x9B, # 0x81 : not user-modifiable */
0x00, # 0x82 : not user-modifiable */
0x00, # 0x83 : not user-modifiable */
0x00, # 0x84 : not user-modifiable */
0x01, # 0x85 : not user-modifiable */
0x01, # 0x86 : clear interrupt, use ClearInterrupt() */
0x40  # 0x87 : start ranging, use StartRanging() or StopRanging(), If you want an automatic start after VL53L1X_init() call, put 0x40 in location 0x87 */
])
class VL53L1X:
    def __init__(self,i2c, address=0x29):
        self.i2c = i2c
        self.address = address
        self.reset()
        machine.lightsleep(1)
        if self.read_model_id() != 0xEACC:
            raise RuntimeError('Failed to find expected ID register values. Check wiring!')
        # write default configuration
        self.i2c.writeto_mem(self.address, 0x2D, VL51L1X_DEFAULT_CONFIGURATION, addrsize=16)
        #machine.lightsleep(100)
        # the API triggers this change in VL53L1_init_and_start_range() once a
        # measurement is started; assumes MM1 and MM2 are disabled
        self.writeReg16Bit(0x001E, self.readReg16Bit(0x0022) * 4)
        machine.lightsleep(200)

    def writeReg(self, reg, value):
        return self.i2c.writeto_mem(self.address, reg, bytes([value]), addrsize=16)
    def writeReg16Bit(self, reg, value):
        return self.i2c.writeto_mem(self.address, reg, bytes([(value >> 8) & 0xFF, value & 0xFF]), addrsize=16)
    def readReg(self, reg):
        return self.i2c.readfrom_mem(self.address, reg, 1, addrsize=16)[0]
    def readReg16Bit(self, reg):
        data = self.i2c.readfrom_mem(self.address, reg, 2, addrsize=16)
        return (data[0]<<8) + data[1]
    def read_model_id(self):
        return self.readReg16Bit(0x010F)
    def reset(self):
        self.writeReg(0x0000, 0x00)
        machine.lightsleep(100)
        self.writeReg(0x0000, 0x01)
    def read(self):
        data = self.i2c.readfrom_mem(self.address, 0x0089, 17, addrsize=16) # RESULT__RANGE_STATUS
        range_status = data[0]
        # report_status = data[1]
        stream_count = data[2]
        dss_actual_effective_spads_sd0 = (data[3]<<8) + data[4]
        # peak_signal_count_rate_mcps_sd0 = (data[5]<<8) + data[6]
        ambient_count_rate_mcps_sd0 = (data[7]<<8) + data[8]
        # sigma_sd0 = (data[9]<<8) + data[10]
        # phase_sd0 = (data[11]<<8) + data[12]
        final_crosstalk_corrected_range_mm_sd0 = (data[13]<<8) + data[14]
        peak_signal_count_rate_crosstalk_corrected_mcps_sd0 = (data[15]<<8) + data[16]
        #status = None
        #if range_status in (17, 2, 1, 3):
            #status = "HardwareFail"
        #elif range_status == 13:
            #status = "MinRangeFail"
        #elif range_status == 18:
            #status = "SynchronizationInt"
        #elif range_status == 5:
            #status = "OutOfBoundsFail"
        #elif range_status == 4:
            #status = "SignalFail"
        #elif range_status == 6:
            #status = "SignalFail"
        #elif range_status == 7:
            #status = "WrapTargetFail"
        #elif range_status == 12:
            #status = "XtalkSignalFail"
        #elif range_status == 8:
            #status = "RangeValidMinRangeClipped"
        #elif range_status == 9:
            #if stream_count == 0:
                #status = "RangeValidNoWrapCheckFail"
            #else:
                #status = "OK"
        return final_crosstalk_corrected_range_mm_sd0
```