emwta/pxt-iBit 5.0.1 GitHub

iBIT block package for i-BIT robot kit

powered by micro:bit

The package adds support for the i-BIT conroller board from Innovative Experiment INEX.

micro:bit Pin Assignment

The following micro:bit pins are used for analog and digital sensors, DC motor drivers and servo motors:

• P0 – Analog Input 0 (micro:bit default)
• P1 – Analog Input 1 (micro:bit default)
• P2 – Analog Input 2 (micro:bit default)
• P8 – Digital Input/Output and AnalogWrite/Servo1
• P12 – Digital Input/Output and AnalogWrite/Servo2
• P13 – DigitalWrite Pin for DC motor control direction 1
• P14 – AnalogWrite Pin for DC motor speed control 1
• P15 – DigitalWrite Pin for DC motor control direction 2
• P16 – AnalogWrite Pin for DC motor speed control 2
• P19 – SCL connected to I2C-based 12-bit ADC chip (ADS7828)
• P20 – SDA connected to I2C-based 12-bit ADC chip (ADS7828)

Motor control Block

Use iBIT’s motor block to drives motor forward and backward. The speed motor is adjustable between 0 to 100.

• The dirrection must be select either Forward or Backward
• Speed is an integer value between 0 - 100

iBIT.Motor(ibitMotor.Forward, 100)

iBIT.Motor(ibitMotor.Backward, 100)

Spin Block

Spin block is used to control both motors separately. For example, choose one motor spin with forward direction another one spin with backward direction.

• The Spin select direction must be either Left or Right
• Speed is an integer value between 0 - 100

iBIT.Spin(ibitSpin.Left, 100)

iBIT.Spin(ibitSpin.Right, 100)

Turn Block

The Turn block is used to to control the robot movment by turning. The one motor will stop, another one is moving. The vipot point is a center of the robot body.

• The Turn select direction must be either Left or Right
• Speed is an integer value between 0 - 100

iBIT.Turn(ibitTurn.Left, 100)

iBIT.Turn(ibitTurn.Right, 100)

Motor Stop Block

The Motor Stop block is used to stop both motors. The speed is set to 0 automatic.

iBIT.MotorStop()

Servo Block

Use this block for control the servo’s moving degree from 0 to 180

• Degree is an integer value between 0 - 180

iBIT.Servo(ibitServo.SV1, 90)

ReadAD Block

This block is used to read the analog input data from the I2C-based ADC integrated circuit, ADS7828. The resolution of conversion is 12-bit. Data will be 0 to 4095. iBIT have 8-ch analog inputs. The pinout voltage range is 0 to +3.3V

• Analog sensor port are ADC0 - ADC7
• Select analog channel from ADC0 - ADC7 for reading the analog sensor.
• Get the analog value to set the conditions for the robot’s mission.

Example

• Read the analog input 0 and display the conversion data on micro:bit. User can change the analog channel any time.

basic.showNumber(iBIT.ReadADC(ibitReadADC.ADC0))

• Drive the motors with Forward and Backward by counting speed 0 - 100

let speed = 0
basic.forever(() => {
    for (let speed = 0; speed <= 100; speed++) {
        iBIT.Motor(ibitMotor.Forward, speed)
        basic.pause(50)
    }
    for (let speed = 0; speed <= 100; speed++) {
        iBIT.Motor(ibitMotor.Backward, speed)
        basic.pause(50)
    }
})

• Drive the motors by pressing button A and B. Turn Left by speed 50 when pressed button A and Turn Right by speed 50 when pressed button B.

input.onButtonPressed(Button.A, () => {
    iBIT.Turn(ibitTurn.Left, 50)
})
input.onButtonPressed(Button.B, () => {
    iBIT.Turn(ibitTurn.Right, 50)
})

• Spin the motors by pressing button A and B. Spin Left by speed 50 when pressed button A and Spin Right by speed 50 when pressed button B.

input.onButtonPressed(Button.A, () => {
    iBIT.Spin(ibitSpin.Left, 50)
})
input.onButtonPressed(Button.B, () => {
    iBIT.Spin(ibitSpin.Right, 50)
})

• Example for Servo, drive the servo motor’s movement angle at Servo output 1 and 2 from 0 - 180 and back to 0 to restart again.

basic.forever(() => {
    for (let Degree = 0; Degree <= 180; Degree++) {
        iBIT.Servo(ibitServo.SV1, Degree)
        iBIT.Servo(ibitServo.SV2, Degree)
        basic.pause(10)
        while (Degree == 180) {
            Degree = 0
        }
    }
})

• Example for set Servo Stop or set freedom servo.

input.onButtonPressed(Button.A, () => {
    iBIT.Servo(ibitServo.SV1, 90)
})
input.onButtonPressed(Button.B, () => {
    iBIT.ServoStop(ibitServo.SV1)
})

License

MIT

Supported targets

• for PXT/microbit

iBIT=github:emwta/pxt-iBit#v5.0.1