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How to Create Temperature Gauge Using Pi Pico
- Abdulrahman Alhamed
- 14 Jul 2023
- Tutorial
- Beginner
- 1472
Join us in this tutorial as we create a temperature gauge using Raspberry Pi Pico and a servo motor! We'll cut a cardboard paper into a half circle, label it with temperature ranges, and attach a servo horn for the temperature indicator. With coding, we'll make the servo move the dial, displaying different temperatures interactively.
Video Tutorial
Components Required
Hardware Components
SG90 Micro Servo
S$2.90 S$2.90
x 1 unit(s)
Raspberry Pi Pico Microcontroller Board
S$7.11++ S$7.11
x 1 unit(s)
Best SellerRobo Pico: Simplifying Robotics with Raspberry ...
S$21.29++ S$21.29
x 1 unit(s)
SG90 Micro Servo
Not Available
x 1 unit(s)
Connection
Connect servo motor to port GP12.
Get Familiar with Thonny and CircuitPython
In this tutorial, we'll use Thonny editor & CircuitPython to build the code for this project. If you're not familiar with Thonny, check out the video below to learn how to get started with it.
Code
Visit the official CircuitPython website and download the latest library bundle. Make sure to select the correct bundle for your version of CircuitPython.
Unzip the file, and locate this library:
- adafruit_motor
Copy and paste it into "lib" folder on your CIRCUITPY drive.
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| import time | |
| import board | |
| import pwmio | |
| from adafruit_motor import servo | |
| import microcontroller | |
| # Create a PWMOut object on Pin GP12 | |
| pwm = pwmio.PWMOut(board.GP12, duty_cycle=2 ** 15, frequency=50) | |
| # Create a servo object, my_servo | |
| my_servo = servo.Servo(pwm) | |
| # Function to map temperature range to servo angle range | |
| def map_temperature_to_angle(temperature, min_temp, max_temp, min_angle, max_angle): | |
| temperature = max(min(temperature, max_temp), min_temp) # Limit temperature within the given range | |
| temperature_range = max_temp - min_temp | |
| angle_range = max_angle - min_angle | |
| angle = ((temperature - min_temp) / temperature_range) * angle_range + min_angle | |
| return int(angle) | |
| while True: | |
| # Read the onboard temperature in Celsius | |
| temperature = microcontroller.cpu.temperature | |
| # Map temperature to servo angle | |
| angle = map_temperature_to_angle(temperature, 18, 35, 180, 0) | |
| # Set the servo angle | |
| my_servo.angle = angle | |
| # Print temperature and servo angle | |
| print("Temperature: {:.2f}°C, Servo Angle: {}".format(temperature, angle)) | |
| time.sleep(1) # Pause for 1 second |
Project complete
Take a piece of cardboard and cut it into a shape that looks like a half circle. You can use a compass to draw the curved line. Remember to write down the numbers on the cardboard to show the temperature range you want.
Next, make a small hole in the cardboard. This hole will be used to attach the servo horn, which will act as the temperature indicator. By moving the servo, we can show different temperatures on the gauge.