StemHat Python Package Documentation

The StemHat Python package provides an easy-to-use interface for controlling the StemHat hardware. It includes functions for managing LEDs, motors, servos, buzzers, and reading sensor data like temperature, humidity, light, and analog inputs. It also supports controlling an OLED display.

Installation

Install the package using pip:

pip install StemHat

Usage

Importing the Package

import StemHat

Functions

LED Control

SetLED(led, red, blue, green)

Sets the color of the specified LED.

Parameters:

• led (int): The LED to control (0 or 1).
• red (int): The red component (0-255).
• blue (int): The blue component (0-255).
• green (int): The green component (0-255).

Buzzer Control

SetBuzzer(frequency)

Sets the buzzer frequency.

Parameters:

• frequency (int): The frequency in Hz (0-2550).

Motor Control

SetMotors(LeftMotorSpeed, RightMotorSpeed)

Sets the speed of the left and right motors.

Parameters:

• LeftMotorSpeed (int): Speed of the left motor (-100 to 100).
• RightMotorSpeed (int): Speed of the right motor (-100 to 100).

Servo Control

SetServo(servo, angle)

Sets the angle of the specified servo.

Parameters:

• servo (int): The servo to control (1, 2, 3, or 4).
• angle (int): The angle to set (0-180).

Sensor Readings

GetAnalog(analog)

Reads the analog value from the specified analog input.

Parameters:

• analog (int): The analog input to read (0 or 1).

Returns:

• (int): The analog value.

GetLightSensor()

Reads the light sensor value.

Returns:

• (int): The light sensor value.

GetVoltage()

Reads the input voltage.

Returns:

• (int): The voltage value.

GetButton(button)

Reads the state of the specified button.

Parameters:

• button (int): The button to read (5 or 6).

Returns:

• (bool): The button state (True if pressed, False otherwise).

GetUltrasonic()

Reads the ultrasonic sensor value.

Returns:

• (int): The ultrasonic sensor value in centimeters.

GetTemperature()

Reads the temperature from the AHT20 sensor.

Returns:

• (float): The temperature in Celsius.

GetHumidity()

Reads the humidity from the AHT20 sensor.

Returns:

• (float): The Humidity in percentage.

OLED Screen Control

OledLine(x1, y1, x2, y2)

Draws a line on the OLED display.

Parameters:

• x1 (int): The x-coordinate of the start point.
• y1 (int): The y-coordinate of the start point.
• x2 (int): The x-coordinate of the end point.
• y2 (int): The y-coordinate of the end point.

OledPoint(x, y, color)

Draws a point on the OLED display.

Parameters:

• x (int): The x-coordinate of the point.
• y (int): The y-coordinate of the point.
• color (int): The color of the point (0 for black, 1 for white).

OledRectangle(x, y, height, width, fill, outline_width)

Draws a rectangle on the OLED display.

Parameters:

• x (int): The x-coordinate of the top-left corner.
• y (int): The y-coordinate of the top-left corner.
• height (int): The height of the rectangle (must be a positive integer).
• width (int): The width of the rectangle (must be a positive integer).
• fill (int): Fill mode (0 for outline, 1 for solid).
• outline_width (int): The width of the rectangle's outline (must be a positive integer).

OledCircles(x, y, radius, outline, outline_width)

Draws a circle on the OLED display.

Parameters:

• x (int): The x-coordinate of the center.
• y (int): The y-coordinate of the center.
• radius (int): The radius of the circle.
• outline (int): Outline mode (0 for outline, 1 for solid).
• outline_width (int): The width of the outline.

OledText(x, y, text, size, color)

Draws text on the OLED display.

Parameters:

• x (int): The x-coordinate of the text.
• y (int): The y-coordinate of the text.
• text (str): The text to display.
• size (int): The font size.
• color (int): The text color (0 for black, 1 for white).

OledImage(x, y, img_path, scale, invert)

Draws an image on the OLED display. (bmp,jpeg or png)

Parameters:

• x (int): The x-coordinate of the image.
• y (int): The y-coordinate of the image.
• img_path (str): The path to the image file.
• scale (int): Scale mode (0 for no scaling, 1 for scaling).
• invert (int): Invert mode (0 for no inversion, 1 for inversion).

OledScroll(direction, speed, start_page, end_page)

Configures and starts scrolling on the OLED display.

Parameters:

• direction (int): Scrolling direction (0 = left, 1 = right).
• speed (int): Scrolling speed (0-8).
• start_page (int): The starting page (0-7).
• end_page (int): The ending page (0-7), must be greater than start_page.

OledScrollStop()

Stop the scolling of the OLED display.

OledClear()

Clears the OLED display.

OledUpdate()

Updates the OLED display with the current drawing.

APDS Gesture,Color and Proximity Sensor

APDSsetMode(mode)

Description: Sets the APDS-9960 sensor to one of three modes: Proximity, Gesture, or Color detection.

Parameters:

• mode (int):
  • 1: Enable Proximity Mode
  • 2: Enable Gesture Mode
  • 3: Enable Color Mode

Usage:

APDSsetMode(1)  # Enable proximity sensing
APDSsetMode(2)  # Enable gesture recognition
APDSsetMode(3)  # Enable color detection

APDSread_gesture()

Description: Reads and returns the detected gesture.

Returns:

• string: The detected gesture (e.g., 'up', 'down', 'left', 'right').
• 0: If no gesture is detected.

Usage:

gesture = APDSread_gesture()
if gesture:
    print(f"Gesture detected: {gesture}")

APDSread_color()

Description: Reads the RGB and Clear values from the sensor.

Returns:

• tuple (R, G, B, Clear): The detected red, green, blue, and clear (ambient light) values.
• None: If no valid color data is available.

Usage:

color = APDSread_color()
if color:
    print(f"Color detected: R={color[0]}, G={color[1]}, B={color[2]}, Clear={color[3]}")

APDSread_proximity()

Description: Reads the proximity value, which represents the distance of an object from the sensor (0-255).

Returns:

• int: A proximity value between 0 (far) and 255 (very close).

Usage:

proximity = APDSread_proximity()
print(f"Proximity: {proximity}")

Reset Stemhat

Reset()

Reset Stemhat to start state.

🎉 Now you're ready to use StemHat with Python! 🚀