ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13964
load:0x40080400,len:3600
entry 0x400805f0
Scanning...
Unknow error at address 0x01
Unknow error at address 0x02
Unknow error at address 0x03
Unknow error at address 0x04
Unknow error at address 0x05
Unknow error at address 0x06
...
Unknow error at address 0x77
Unknow error at address 0x78
Unknow error at address 0x79
Unknow error at address 0x7A
Unknow error at address 0x7B
Unknow error at address 0x7C
Unknow error at address 0x7D
Unknow error at address 0x7E
No I2C devices found

/*********
 Rui Santos
 Complete project details at https://randomnerdtutorials.com 
*********/
#include <Wire.h>
 
void setup() {
 Wire.begin();
 Serial.begin(115200);
 Serial.println("\nI2C Scanner");
}
 
void loop() {
 byte error, address;
 int nDevices;
 Serial.println("Scanning...");
 nDevices = 0;
 for(address = 1; address < 127; address++ ) {
 Wire.beginTransmission(address);
 error = Wire.endTransmission();
 if (error == 0) {
 Serial.print("I2C device found at address 0x");
 if (address<16) {
 Serial.print("0");
 }
 Serial.println(address,HEX);
 nDevices++;
 }
 else if (error==4) {
 Serial.print("Unknow error at address 0x");
 if (address<16) {
 Serial.print("0");
 }
 Serial.println(address,HEX);
 } 
 }
 if (nDevices == 0) {
 Serial.println("No I2C devices found\n");
 }
 else {
 Serial.println("done\n");
 }
 delay(5000); 
}

#include <math.h>
#include "BluetoothSerial.h"
#include <Wire.h>
const int LDR_PIN = 34;
const float Vcc = 3.3;
const float R_fixed = 10000;
uint8_t temp_msb, temp_lsb;
const int temp_address = 0x4C;
uint16_t temp_reg;
float temperatureC;
BluetoothSerial SerialBT;
void setup() {
 Serial.begin(115200);
 pinMode(2, OUTPUT);
 SerialBT.begin("CDHTVL11L114N7B7");
 searchI2C();
}
void loop() {
 Wire.beginTransmission(temp_address);
 Wire.write(0x00);
 Wire.endTransmission();
 Wire.requestFrom(temp_address, 2);
 temp_msb = Wire.read();
 temp_lsb = Wire.read();
 temp_reg = (temp_msb << 8) | temp_lsb;
 temperatureC = temp_reg/256.0f;
 int adcValue = analogRead(LDR_PIN);
 float lux = calculateLux(adcValue);
 // Serial.printf("Lux: %.2f\n", lux);
 // Serial.printf("Temp: %.2f\n", temperatureC);
 if (lux < 100) {
 digitalWrite(2, HIGH);
 } else {
 digitalWrite(2, LOW);
 }
 SerialBT.println(lux);
 SerialBT.println(temperatureC,3);
 delay(100);
}
float calculateLux(int analogValue) {
 const float R_fixed = 10000.0;
 const float Vcc = 3.3;
 const float R0 = 45000.0; // 32500.0;
 const float luxAtR0 = 10.0;
 float Vout = (analogValue * Vcc) / 4095.0;
 float RLDR = (R_fixed * (Vcc - Vout)) / Vout;
 float lux = luxAtR0 * pow((R0 / RLDR), 1.0);
 return lux * 10;
}
void searchI2C() {
 byte error, address;
 int nDevices;
 Serial.println("Scanning...");
 nDevices = 0;
 for(address = 1; address < 127; address++ ) {
 Wire.beginTransmission(address);
 error = Wire.endTransmission();
 if (error == 0) {
 Serial.print("I2C device found at address 0x");
 if (address<16) {
 Serial.print("0");
 }
 Serial.println(address,HEX);
 nDevices++;
 }
 else if (error==4) {
 Serial.print("Unknow error at address 0x");
 if (address<16) {
 Serial.print("0");
 }
 Serial.println(address,HEX);
 } 
 }
 if (nDevices == 0) {
 Serial.println("No I2C devices found\n");
 }
 else {
 Serial.println("done\n");
 }
}

ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13964
load:0x40080400,len:3600
entry 0x400805f0
Scanning...
Unknow error at address 0x01
Unknow error at address 0x02
Unknow error at address 0x03
Unknow error at address 0x04
Unknow error at address 0x05
Unknow error at address 0x06
...
Unknow error at address 0x77
Unknow error at address 0x78
Unknow error at address 0x79
Unknow error at address 0x7A
Unknow error at address 0x7B
Unknow error at address 0x7C
Unknow error at address 0x7D
Unknow error at address 0x7E
No I2C devices found