Home Circuitpython Adafruit Feather M0 and GUVA-S12SD UV Sensor circuitpython example

Adafruit Feather M0 and GUVA-S12SD UV Sensor circuitpython example

by shedboy71

In this example we connect a GUVA-S12SD UV Sensor to an Adafruit Feather M0 running Circuitpython

First lets look at some information about the sensor

Description

The GUVA-S12SD UV Sensor chip is suitable for detecting the UV radiation in sunlight. It can be used in any application where you want monitor for the amount of UV light and is simple to connect to any microcontroller. I recently noticed that some sellers had little modules for this sensor at a reasonable price so decided to purchase one

The module, with a typical UV detection wavelength of 200 – 370nm, outputs a calibrated analog voltage which varies with the UV light intensity so basically all you need to do is connect this to an ADC input and read in the value.

This value ties in with the UV index, this looks something like this

Connection

The connections are straightforward and described below, I used 3.3v from my Micro:bit. This was mainly for compatibility with other development boards but the module works with 5v.

1. GND: 0V (Ground)
2. VCC: 3.3V to 5.5V
3. OUT: 0V to 1V ( 0 to 10 UV Index)

 

Parts Required

 

Name Link
Adafruit Feather M0 Express Adafruit (PID 3403) Feather M0 Express – Designed for CircuitPython – ATSAMD21 Cortex M0
guva-s12sd UV Sensor GUVA-S12SD Solar Ultraviolet Intensity Sensor 240nm-370nm 2.5V-5V
Connecting cables Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire

 

Schematic/Connection

feather and guva-s12sd layout

feather and guva-s12sd layout

Code Example

I used Mu for development

import time
import board
from digitalio import DigitalInOut, Direction, Pull
from analogio import AnalogIn
 
pin = AnalogIn(board.A1)
 
def get_voltage(pin):
	return (pin.value * 3.3) / 65536
 
while True:
    print(get_voltage(pin))
    #print(pin.value)
    time.sleep(1)

Output

Here is what I saw in Mu REPL window

0.0185303
0.0185303
0.0128906
0.0169189
0.0153076
0.0169189
0.0128906
0.0161133
0.0185303
0.0177246
0.0112793

Links

 

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