JUGEMテーマ：電子工作
照度センサーTSL2572をESP32のmicropythonで使う
秋月から照度センサーTSL2572が届いたので、ESP32に繋いで測定してみた。
秋月のページにサンプルとして掲載されている
プログラムにラズパイ用が有ったのでこれをベースにESP32のmicropythonで使えるようにしました。
■回路図
■ソース
ほぼそのままですが、ESP32のmicropythonに合わせて書き換えています。
#
#
# ESP32 micro python system
#
# 接続（秋月の商品No=K-15536の場合）
# TSL2572----------ESP32
# VIN 3V3
# 3V3 3V3
# GND GND
# SDA 21
# SCL 22
#
# 仕様
#
# 光の強さをルクス（LUX）単位で取得して表示する
#
import time
from machine import Pin, I2C
import sys
time.sleep(3.5)
print("TSL25721-get-LUX Build0.2")
i2c=I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)
addr_tsl25721=0x39
print(i2c.scan())
#TSL2572 Register Set
TSL2572_ADR = 0x39
TSL2572_COMMAND = 0x80
TSL2572_TYPE_REP = 0x00
TSL2572_TYPE_INC = 0x20
TSL2572_ALSIFC = 0x66
TSL2572_SAI = 0x40
TSL2572_AIEN = 0x10
TSL2572_WEN = 0x80
TSL2572_AEN = 0x02
TSL2572_PON = 0x01
TSL2572_ENABLE = 0x00
TSL2572_ATIME = 0x01
TSL2572_WTIME = 0x03
TSL2572_AILTL = 0x04
TSL2572_AILTH = 0x05
TSL2572_AIHTL = 0x06
TSL2572_AIHTH = 0x07
TSL2572_PRES = 0x0C
TSL2572_CONFIG = 0x0D
TSL2572_CONTROL = 0x0F
TSL2572_ID = 0x12
TSL2572_STATUS = 0x13
TSL2572_C0DATA = 0x14
TSL2572_C0DATAH = 0x15
TSL2572_C1DATA = 0x16
TSL2572_C1DATAH = 0x17
#TSL2572 setings
atime = 0xC0
gain = 1.0
buf = bytearray(1)
def initTSL2572() :
if (getTSL2572reg(TSL2572_ID)!=0x34) :
#check TSL2572 ID
return -1
setTSL2572reg(TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_CONTROL, 0x00)
setTSL2572reg(TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_CONFIG, 0x00)
setTSL2572reg(TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_ATIME, atime)
setTSL2572reg(TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_ENABLE, TSL2572_AEN | TSL2572_PON)
return 0
def getTSL2572reg(reg) :
#dat = i2c.read_i2c_block_data(TSL2572_ADR,TSL2572_COMMAND | TSL2572_TYPE_INC | reg,1)
dat = i2c.readfrom_mem(addr_tsl25721, TSL2572_COMMAND | TSL2572_TYPE_INC | reg, 1)
print("dat="+str(dat[0]))
return dat[0]
def setTSL2572reg(reg, dat) :
#i2c.write_byte_data(TSL2572_ADR,reg,dat)
buf[0]=dat
i2c.writeto_mem(TSL2572_ADR, reg, buf)
def getTSL2572adc() :
#dat = i2c.read_i2c_block_data(TSL2572_ADR,TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_C0DATA,4)
dat = i2c.readfrom_mem(addr_tsl25721, TSL2572_COMMAND | TSL2572_TYPE_INC | TSL2572_C0DATA, 4)
adc0 = (dat[1] << 8) | dat[0]
adc1 = (dat[3] << 8) | dat[2]
return[adc0,adc1]
#main
print("init....")
if (initTSL2572()!=0) :
print("Failed. Check connection!!")
sys.exit()
while 1:
adc = getTSL2572adc()
cpl = 0.0
lux1 = 0.0
lux2 = 0.0
cpl = (2.73 * (256 - atime) * gain)/(60.0)
lux1 = ((adc[0] * 1.00) - (adc[1] * 1.87)) / cpl
lux2 = ((adc[0] * 0.63) - (adc[1] * 1.00)) / cpl
if ((lux1 <= 0) and (lux2 <= 0)) :
print("0 Lx")
elif (lux1 > lux2) :
print("{:.1f} Lx".format(lux1))
elif (lux1 < lux2) :
print("{:.1f} Lx".format(lux2))
time.sleep(1.0)