node-red-contrib-i2c-motorhat

Node-red nodes communicate with the Raspberry Pi I2C Motor Hat

Nodes Introduction

i2c motor scan

Return a list of addresses of i2c devices connected to raspebrry pi.

i2c DC motor

Node config:

• Bus Number: default to 1
• Bus Address: default to 96

Node input:

• index
  • motor index, choose from {1,2,3,4}
• speed
  • motor speed, range from [0, 255]
• command
  • 1 - Forward
  • 2 - Backward
  • 3 - Brake
  • 4 - Release
• runtime
  • < 0 - Run till Release command
  • Otherwise - Run for input seconds

example input node - 4th DC motor runs for 2 seconds with 250/255 of full speed and forward direction.

controlMsg = {};

// varialbles
controlMsg["index"] = 4;
controlMsg["speed"] = 250;
controlMsg["command"] = 1;
controlMsg["runtime"] = 2;
return controlMsg;

Output:

Error msg.

i2c Stepper motor

Node config

• Bus Number: default to 1
• Bus Address: default to 96

Node input

• index
  • Stepper index, choose from {1,2}
• speed
  • motor speed
• command
  • 1 - Forward
  • 2 - Backward
  • 3 - Brake
  • 4 - Release
• Style
  • 1 - Single
  • 2 - Double
  • 3 - Interleave
  • 4 - Microstep
• step
  • number of steps

example input node

controlMsg = {};

// varialbles
controlMsg["index"] = 2;
controlMsg["speed"] = 120;
controlMsg["step"] = 200;
controlMsg["command"] = 1;
controlMsg["style"] = 2;
return controlMsg;

Output:

Error msg.