Data Sheet

ManualsBrandsPimoroni ManualsInfrared & Light SensorsLTR-559 Light & Proximity Sensor Breakout Board

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Part No. : LTR-559ALS-01

BNS-OD-FC002/A4

Optical Sensor

LTR-559ALS-01

ALS Threshold Registers

// The ALS_THRES_UP and ALS_THRES_LOW registers determines the upper and lower limit of the interrupt threshold value.

// Following example illustrates the setting of the ALS threshold window of decimal values of 200 (lower threshold)

// and 1000 (upper threshold)

Slave_Addr = 0x23 // Slave address of LTR-559 device

// Upper Threshold Setting (decimal 1000)

ALS_Upp_Threshold_Reg_0 = 0x97 // ALS Upper Threshold Low Byte Register address

ALS_Upp_Threshold_Reg_1 = 0x98 // ALS Upper Threshold High Byte Register address

Data1 = 1000 >> 8 // To convert decimal 1000 into two eight bytes register values

Data0 = 1000 & 0xFF

WriteByte(Slave_Addr, ALS_Upp_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, ALS_Upp_Threshold_Reg_1, Data1)

// Lower Threshold Setting (decimal 200)

ALS_Low_Threshold_Reg_0 = 0x99 // ALS Lower Threshold Low Byte Register address

ALS_Low_Threshold_Reg_1 = 0x9A // ALS Lower Threshold High Byte Register address

Data1 = 200 >> 8 // To convert decimal 200 into two eight bytes register values

Data0 = 200 & 0xFF

WriteByte(Slave_Addr, ALS_Low_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, ALS_Low_Threshold_Reg_1, Data1)

PS Threshold Registers

// The PS_THRES_UP and PS_THRES_LOW registers determines the upper and lower limit of the interrupt threshold value.

// Following example illustrates the setting of the PS dynamic threshold with hysteresis interruption for

// decimal value 1000 (for NEAR detection) and 500 (for FAR detection)

Slave_Addr = 0x23 // Slave address of LTR-559 device

//For NEAR detection (decimal 1000)

PS_Upp_Threshold_Reg_0 = 0x90 // PS Upper Threshold Low Byte Register address

PS_Upp_Threshold_Reg_1 = 0x91 // PS Upper Threshold High Byte Register address

Data1 = 1000 >> 8 // To convert decimal 1000 into two eight bytes register values

Data0 = 1000 & 0xFF

WriteByte(Slave_Addr, PS_Upp_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, PS_Upp_Threshold_Reg_1, Data1)

PS_Low_Threshold_Reg_0 = 0x92 // PS Lower Threshold Low Byte Register address

PS_Low_Threshold_Reg_1 = 0x93 // PS Lower Threshold High Byte Register address

Data1 = 0 >> 8 // To convert decimal 0 into two eight bytes register values

Data0 = 0 & 0xFF

WriteByte(Slave_Addr, PS_Low_Threshold_Reg_0, Data0)

WriteByte(Slave_Addr, PS_Low_Threshold_Reg_1, Data1)

//For FAR detection (decimal 500)

PS_Upp_Threshold_Reg_0 = 0x90 // PS Upper Threshold Low Byte Register address

PS_Upp_Threshold_Reg_1 = 0x91 // PS Upper Threshold High Byte Register address

Data1 = 2047 >> 8 // To convert decimal 2047 into two eight bytes register values

Data0 = 2047 & 0xFF