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Read Sensor Value

This guide will show you how to read the analog and digital sensor value from Grove Port or GPIO breakout.

 

Analog Read

The figure below shows the GPIO that can read analog sensor value.

Note: You may look for the pins labelled "ADC" at the back of the board.

1. While your Robo Pico is connected to your computer, open your editor software (for example Thonny). Select the code.py file in your drive.


2. Connect your sensor module to the Robo Pico, to Grove Port 6 using Grove to 4 female pins / grove cable.
OR connect to the GPIO breakout using male-to-female jumper wires togetther with grove cables (if applicable).

Example module used: Maker Soil Moisture Sensor

 

3. Copy and paste the following code to your editor.

Copy 
"""
DESCRIPTION:
This example code will uses: Robo Pico and Raspberry Pi Pico / Pico W
to read analog value on the Maker Soil.
This code applicable to other analog sensor.
 
CONNECTION:
Robo Pico : Maker Line
GROVE 6   - Maker Line Grove
GP27      - OUT
 
AUTHOR  : Cytron Technologies Sdn Bhd
WEBSITE  : www.cytron.io
EMAIL    : support@cytron.io
 
REFERENCE:
Tutorial link:
https://www.cytron.io/tutorial/get-started-robo-pico-circuitpython-read-analog-sensor-value
Maker Soil:
https://my.cytron.io/p-maker-soil-moisture-sensor
"""
#Import necessary libraries
import board
import time
import analogio
 
#Define analog pin GP27 used on the board
sensor = analogio.AnalogIn(board.GP27)
 
while True:
    #Serial print the sensor value every 1 second
    raw_value = sensor.value
    voltage_value = (raw_value * 3.3) / 65536
    print('Raw Value : ', raw_value)
    print('Voltage Value : ', voltage_value)
    print('-------------------------')
    time.sleep(1)
view raw Getting_Started_Guide/CircuitPython/Analog_Read/code.py delivered with ❤ by emgithub

 

4. Flash the codes to your Raspberry Pi Pico / Pico W. And your CIRCUITPY drive should look like this (no lib file is used):

 

Digital Read

We will show all 3 types of connections for this application, including Grove Ports, Maker Port and GPIO Breakout.

In this example, we will use the generic module of HC-SR04 Ultrasonic Sensor as illustration.

 

Grove Port and GPIO Breakout

1. While your Robo Pico is connected to your computer, open your editor software (for example Thonny). Select the code.py file in your drive.


2. Connect your sensor module to the Robo Pico, to Grove Port 4 using Grove to 4 female pins / grove cable.
OR connect to the GPIO breakout using male-to-female jumper wires.

3. Copy and paste the following code to your editor.

Copy 
"""
DESCRIPTION:
This example code will uses: Robo Pico and Raspberry Pi Pico / Pico W
to read distance from Ultrasonic Sensor HC-SR04P.
 
CONNECTION:
Robo Pico Grove 4 : HC-SR04P
GP16              - Echo
GP17              - Trig
 
AUTHOR  : Cytron Technologies Sdn Bhd
WEBSITE  : www.cytron.io
EMAIL    : support@cytron.io
 
REFERENCE:
Tutorial link:
https://www.cytron.io/tutorial/get-started-robo-pico-circuitpython-read-analog-sensor-value
"""
#Import necessary libraries
import time
import board
import digitalio
import adafruit_hcsr04
 
#Define pin GP16 and GP17 used on the board
sonar = adafruit_hcsr04.HCSR04(trigger_pin=board.GP16, echo_pin=board.GP17)
 
while True:
    Distance = sonar.distance
    print('Distance : ', Distance, 'cm')
    time.sleep(1)
view raw Getting_Started_Guide/CircuitPython/Ultrasonic_Sensor_HC-SR04P/code.py delivered with ❤ by emgithub

 

4. Flash the codes to your Raspberry Pi Pico / Pico W. And your CIRCUITPY drive should look like this:

Library file(s) required:
    adafruit_hcsr04.mpy

If you don't have this file in your computer, download the lib bundle here and search for this file inside the "lib" folder.

 

Maker Port

1. While your Robo Pico is connected to your computer, open your editor software (for example Thonny). Select the code.py file in your drive.


2. Connect your sensor module to the Robo Pico, to Maker Port using JST SH to 4 female pins / grove cable.

3. Copy and paste the following code to your editor.

 

Copy 
"""
DESCRIPTION:
This example code will uses: Robo Pico and Raspberry Pi Pico / Pico W
to read distance from Ultrasonic Sensor HC-SR04P.
 
CONNECTION:
Robo Pico Maker Port : HC-SR04P
GP2                 - Echo
GP3                 - Trig
 
AUTHOR  : Cytron Technologies Sdn Bhd
WEBSITE  : www.cytron.io
EMAIL    : support@cytron.io
 
REFERENCE:
Tutorial link:
https://www.cytron.io/tutorial/get-started-robo-pico-circuitpython-read-analog-sensor-value
"""
#Import necessary libraries
import time
import board
import digitalio
import adafruit_hcsr04
 
#Define pin GP16 and GP17 used on the board
sonar = adafruit_hcsr04.HCSR04(trigger_pin=board.GP3, echo_pin=board.GP2)
 
while True:
    Distance = sonar.distance
    print('Distance : ', Distance, 'cm')
    time.sleep(1)
view raw Getting_Started_Guide/CircuitPython/Ultrasonic_Sensor_HC-SR04P/Ultrasonic_HCSR04_Maker_Port.py delivered with ❤ by emgithub

 

4. Flash the codes to your Raspberry Pi Pico / Pico W. And your CIRCUITPY drive should look like this:

Library file(s) required:
    adafruit_hcsr04.mpy

If you don't have this file in your computer, download the lib bundle here and search for this file inside the "lib" folder.

 

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