How to Use PICAXE-14M: Examples, Pinouts, and Specs

The PICAXE-14M is a versatile microcontroller designed for educational and hobbyist projects. It features 14 pins, including input/output capabilities, and is programmable using a simple BASIC-like language. This makes it an excellent choice for beginners and those looking to quickly prototype electronic projects. The PICAXE-14M is ideal for controlling sensors, actuators, and other peripherals, offering a user-friendly platform for learning and experimentation.

• Educational projects for learning microcontroller programming
• Prototyping simple automation systems
• Controlling LEDs, motors, and servos
• Interfacing with sensors (e.g., temperature, light, or motion sensors)
• Building interactive devices and games

• Microcontroller Type: PICAXE-14M
• Number of Pins: 14
• Operating Voltage: 3V to 5V
• Programming Language: BASIC-like syntax
• Clock Speed: 4 MHz (internal resonator)
• Memory: 256 bytes (program memory)
• Input/Output Pins: 5 configurable I/O pins
• ADC Channels: 4 (10-bit resolution)
• PWM Outputs: 2
• Serial Communication: Supported (via programming pins)

The PICAXE-14M has 14 pins, each with specific functions. Below is the pinout and description:

1. Power Supply: Connect the V+ pin (Pin 1) to a 3V-5V power source and the 0V (GND) pin (Pin 8) to ground.
2. Programming: Use the PICAXE programming cable to connect the Serial In (Pin 13) and Serial Out (Pin 14) to your computer. Install the PICAXE Editor software to write and upload programs.
3. Connecting Peripherals: Attach sensors, LEDs, or other components to the I/O pins (C.0 to C.5, B.0 to B.3) as needed. Use resistors where appropriate to limit current.
4. Running the Program: Once programmed, the PICAXE-14M will execute the uploaded code automatically when powered on.

• Voltage Levels: Ensure the operating voltage does not exceed 5V to avoid damaging the microcontroller.
• Pull-Down Resistors: Use pull-down resistors on input pins to prevent floating states.
• Decoupling Capacitor: Place a 0.1 µF capacitor between V+ and GND to stabilize the power supply.
• Programming Cable: Use the official PICAXE USB programming cable for reliable communication.
• Pin Limitations: Avoid exceeding the current limits of the I/O pins (20 mA per pin, 90 mA total).

Below is an example program to blink an LED connected to Pin B.0:

' Blink an LED connected to Pin B.0
' Ensure a current-limiting resistor (e.g., 330 ohms) is used with the LED.

main:               ' Start of the program
  high B.0          ' Turn on the LED
  pause 1000        ' Wait for 1 second (1000 ms)
  low B.0           ' Turn off the LED
  pause 1000        ' Wait for 1 second
  goto main         ' Repeat the loop

This example reads a value from an analog sensor connected to Pin C.1 and outputs it via serial communication:

' Read an analog sensor connected to Pin C.1
' and send the value to the serial monitor.

main:               ' Start of the program
  readadc C.1, b1   ' Read the analog value into variable b1 (0-255)
  sertxd ("Value: ", #b1, 13, 10) ' Send the value via serial (newline included)
  pause 500         ' Wait for 500 ms before the next reading
  goto main         ' Repeat the loop

1. The PICAXE-14M is not responding to programming commands.

   • Ensure the programming cable is securely connected to the Serial In and Serial Out pins.
   • Verify that the correct COM port is selected in the PICAXE Editor software.
   • Check the power supply to ensure the microcontroller is powered.

2. The program is not running after uploading.

   • Confirm that the microcontroller is properly reset after programming.
   • Check for syntax errors in the code and re-upload the program.

3. The sensor readings are inconsistent.

   • Use a decoupling capacitor near the sensor to reduce noise.
   • Ensure proper grounding and stable power supply connections.

4. The LED is not blinking as expected.

   • Verify the LED polarity (longer leg is positive).
   • Check the resistor value to ensure it is appropriate for the LED.

• Use the PICAXE simulator in the Editor software to test your code before uploading.
• Label your connections clearly to avoid wiring errors.
• Refer to the official PICAXE manuals for advanced programming techniques and examples.