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cn
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
package veml6070
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// I2C addresses and other constants
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const (
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ADDR_L = 0x38 // 7bit address of the VEML6070 (write, read)
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ADDR_H = 0x39 // 7bit address of the VEML6070 (read)
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)
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// Some possible values for resistance value (in ohm) of VEML6070 calibration resistor
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const (
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RSET_240K = 240000
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RSET_270K = 270000
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RSET_300K = 300000
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RSET_600K = 600000
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)
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// Possible values for integration time of VEML6070
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// (internally represents the config register bit mask)
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const (
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IT_HALF = 0x00
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IT_1 = 0x04
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IT_2 = 0x08
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IT_4 = 0x0C
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)
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// Possible values for UVI (UV index) risk level estimations - the VEML6070 can
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// only estimate UVI risk levels since it can only sense UVA rays but the vendor
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// tried to come up with some coarse thresholds, from application notes
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const (
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UVI_RISK_LOW = iota
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UVI_RISK_MODERATE
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UVI_RISK_HIGH
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UVI_RISK_VERY_HIGH
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UVI_RISK_EXTREME
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)
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// Scale factor in milliseconds / ohm to determine refresh time
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// (aka sampling time) without IT_FACTOR for any given RSET, from datasheet.
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// Note: 100.0 milliseconds are applicable for RSET=240 kOhm and IT_FACTOR=1
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const RSET_TO_REFRESHTIME_SCALE = 100.0 / RSET_240K
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// The refresh time in milliseconds for which NORMALIZED_UVA_SENSITIVITY
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// is applicable to a step count
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const NORMALIZED_REFRESHTIME = 100.0
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// The UVA sensitivity in mW/(m*m)/step which is applicable to a step count
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// normalized to the NORMALIZED_REFRESHTIME, from datasheet for RSET=240 kOhm
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// and IT_FACTOR=1
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const NORMALIZED_UVA_SENSITIVITY = 50.0
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// Config register
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// Possible values for shutdown
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const (
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CONFIG_SD_DISABLE = 0x00
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CONFIG_SD_ENABLE = 0x01
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)
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// Enable / disable
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const (
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CONFIG_DEFAULTS = 0x02
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CONFIG_ENABLE = CONFIG_SD_DISABLE | CONFIG_DEFAULTS
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CONFIG_DISABLE = CONFIG_SD_ENABLE | CONFIG_DEFAULTS
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)
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