adafruit_veml6070
- VEML6070 UV Sensor¶
CircuitPython library to support VEML6070 UV Index sensor.
- Author(s): Limor Fried & Michael Schroeder
Implementation Notes¶
Hardware:
- Adafruit VEML6070 UV Index Sensor Breakout (Product ID: 2899)
Software and Dependencies:
- Adafruit CircuitPython firmware (2.2.0+) for the ESP8622 and M0-based boards: https://github.com/adafruit/circuitpython/releases
- Adafruit’s Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice
Notes:
-
class
adafruit_veml6070.
VEML6070
(i2c_bus, _veml6070_it='VEML6070_1_T', ack=False)[source]¶ Driver base for the VEML6070 UV Light Sensor
Parameters: - i2c_bus – The
busio.I2C
object to use. This is the only required parameter. - _veml6070_it (str) – The integration time you’d like to set initially. Availble
options:
VEML6070_HALF_T
,VEML6070_1_T
,VEML6070_2_T
, andVEML6070_4_T
. The higher the ‘_x_’ value, the more accurate the reading is (at the cost of less samples per reading). Defaults toVEML6070_1_T
if parameter not passed. To change setting after intialization, use[veml6070].set_integration_time(new_it)
. - ack (bool) – The inital setting of
ACKnowledge
on alert. Defaults toFalse
if parameter not passed. To change setting after intialization, use[veml6070].set_ack(new_ack)
.
Example:
from board import * import busio, veml6070, time with busio.I2C(SCL, SDA) as i2c: uv = veml6070.VEML6070(i2c, 'VEML6070_1_T', True) # take 10 readings for j in range(10): uv_raw = uv.uv_raw risk_level = uv.get_index(uv_raw) print('Reading: ', uv_raw, ' | Risk Level: ', risk_level) time.sleep(1)
-
ack
¶ Turns on or off the ACKnowledge function of the sensor. The ACK function will send a signal to the host when the value of the sensed UV light changes beyond the programmed threshold.
-
ack_threshold
¶ The ACKnowledge Threshold, which alerts the host controller to value changes greater than the threshold. Available settings are:
0
= 102 steps;1
= 145 steps.0
is the default setting.
-
get_index
(_raw)[source]¶ Calculates the UV Risk Level based on the captured UV reading. Requres the
_raw
argument (fromveml6070.uv_raw
). Risk level is available for Integration Times (IT) 1, 2, & 4. The result is automatically scaled to the current IT setting.LEVEL* UV Index ===== ======== LOW 0-2 MODERATE 3-5 HIGH 6-7 VERY HIGH 8-10 EXTREME >=11- Not to be considered as accurate condition reporting. Calculation is based on VEML6070 Application Notes: http://www.vishay.com/docs/84310/designingveml6070.pdf
-
integration_time
¶ The Integration Time of the sensor, which is the refresh interval of the sensor. The higher the refresh interval, the more accurate the reading is (at the cost of less sampling). The available settings are:
VEML6070_HALF_T
,VEML6070_1_T
,VEML6070_2_T
,VEML6070_4_T
.
-
sleep
()[source]¶ Puts the VEML6070 into sleep (‘shutdown’) mode. Datasheet claims a current draw of 1uA while in shutdown.
-
uv_raw
¶ Reads and returns the value of the UV intensity.
- i2c_bus – The