adafruit_veml6070 - VEML6070 UV Sensor

CircuitPython library to support VEML6070 UV Index sensor.

  • Author(s): Limor Fried & Michael Schroeder

Implementation Notes

Hardware:

Software and Dependencies:

Notes:

  1. Datasheet: https://cdn-learn.adafruit.com/assets/assets/000/032/482/original/veml6070.pdf
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, and VEML6070_4_T. The higher the ‘_x_’ value, the more accurate the reading is (at the cost of less samples per reading). Defaults to VEML6070_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 to False 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.read
        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 (from veml6070.read). 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
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.

read

Reads and returns the value of the UV intensity.

sleep()[source]

Puts the VEML6070 into sleep (‘shutdown’) mode. Datasheet claims a current draw of 1uA while in shutdown.

wake()[source]

Wakes the VEML6070 from sleep. [veml6070].read will also wake from sleep.