Digital 16bit Serial Output Type Ambient Light Sensor IC by ROHM, Ambient light sensor (Illuminance to digital converter). Forked from Kenji Arai BH1750, minor changes.
BH1750.h
- Committer:
- kenjiArai
- Date:
- 2017-08-23
- Revision:
- 1:4a02a8fbf021
- Parent:
- 0:d95f6ac4c8d6
- Child:
- 2:74dba61588ed
File content as of revision 1:4a02a8fbf021:
/* * mbed library program * light intensity sensor module with built-in a 16 bit AD converter generating digital signal. * BH1750 by ROHM Co.,Ltd. * * Copyright (c) 2015,'17 Kenji Arai / JH1PJL * http://www.page.sannet.ne.jp/kenjia/index.html * http://mbed.org/users/kenjiArai/ * Created: March 7th, 2015 * Revised: August 23rd, 2017 */ /* *---------------- REFERENCE ---------------------------------------------------------------------- * Original Information * http://www.rohm.co.jp/web/japan/products/-/product/BH1750FVI * Device kit * http://www.aitendo.com/product/10240 */ #ifndef BH1750_H #define BH1750_H #include "mbed.h" // light intensity sensor, BH1750 // 7bit address = 0b0100011(0x23) or 0b1011100(0x5c) #define BH1750_G_CHIP_ADDR (0x23 << 1) #define BH1750_V_CHIP_ADDR (0x5c << 1) ////////////// COMMAND //////////////////////////////////// #define CMD_PWR_DWN 0x00 #define CMD_PWR_UP 0x01 #define CMD_RESET 0x07 #define CMD_C_H_RES_M 0x10 #define CMD_C_H_RES_M2 0x11 #define CMD_C_L_RES_M 0x13 #define CMD_1_H_RES_M 0x20 #define CMD_1_H_RES_M2 0x21 #define CMD_1_L_RES_M 0x23 #define CMD_M_TIME_H 0x40 #define CMD_M_TIME_L 0x60 ////////////// SENSITIVITY //////////////////////////////// #define SENS_1R00 69 #define SENS_3R68 254 #define SENS_0R45 31 #define SENS_2R00 138 #define SENS_0R50 35 /** Interface for Luminosity sensor, BH1750 * @code * #include "mbed.h" * #include "BH1750.h" * * // I2C Communication * BH1750 lum(dp5,dp27); // BH1750 SDA, SCL * // If you connected I2C line not only this device but also other devices, * // you need to declare following method. * I2C i2c(dp5,dp27); // SDA, SCL * BH1750 lum(i2c); // BH1750 SDA, SCL (Data available every 120mSec) * * int main() {; * while(true){ * printf("Illuminance: %+7.2f [Lux]\r\n", lum.lux()); * wait(1.0); * } * } * @endcode */ class BH1750 { public: /** Configure data pin * @param data SDA and SCL pins */ BH1750(PinName p_sda, PinName p_scl); BH1750(PinName p_sda, PinName p_scl, uint8_t addr); /** Configure data pin (with other devices on I2C line) * @param I2C previous definition */ BH1750(I2C& p_i2c); BH1750(I2C& p_i2c, uint8_t addr); /** Get Illuminance, unit of Lux * @param none * @return Lux */ float lux(void); /** Set sensor sensitivity adjustment * @param sensitivity parameter * @return none */ void set_sensitivity(uint8_t parameter); /** Set I2C clock frequency * @param freq. * @return none */ void frequency(int hz); /** Power Up/Down * @param none * @return none */ void power_up(void); void power_down(void); protected: I2C *_i2c_p; I2C &_i2c; void init(void); private: uint8_t BH1750_addr; uint8_t dt[4]; int8_t sensitivity; }; #endif // BH1750_H