@redplc/node-red-rpi-gpio v2.0.7

@redplc/node-red-rpi-gpio

Node-RED nodes for Raspberry Pi GPIO using with redPlc nodes.

Nodes

• rpi-gpio-in: Reads GPIO inputs and store in boolean array.
• rpi-gpio-out: Sets GPIO outputs from boolean array.
• rpi-gpio-pwm: Sets GPIO pwm duty cycles from number array.
• rpi-gpio-cnt: Counts GPIO inputs pulse and store in number array.

Usage

• Install redPlc nodes.
• Use redPlc s-inject node for trigger update.
• Connect to first output on s-inject node.
• Daisy chain nodes in series.
• For logical operations use redPlc nodes.
• Data is exchanged with global context variable arrays.
• Array index is equal gpio number for easy handling.
• Select different gpio pins for input, output and pwm.
• For open inputs select pull down/up resistors.
• This node works on Raspberry Pi with 32bit or 64bit OS.
• Check with raspi-config for alternate functions on GPIO.

Array Index Mapping

Examples

Example 1

This example is a self holding circuit used for push buttons. Led turns on, if switch GPIO21 is closed. Led turns off, if switch GPIO20 is closed.

• Connect LED with resistor (~220 Ohms) to GPIO26 and ground pin.
• Connect switches to GPIO20 and GPIO21 and ground pin.
• Select GPIO20 and GPIO21 as pullup inputs.
• Select GPIO26 as output.

Example 2

This example sets led brightness to 25%, 50% or 100% with switches.

• Connect LED with resistor (~220 Ohms) to GPIO26 and ground pin.
• Connect switches to GPIO16, GPIO20 and GPIO21 and ground pin.
• Select GPIO16, GPIO20 and GPIO21 as pullup inputs.
• Select GPIO26 as pwm.