@redplc/node-red-rpi-gpio 2.0.7
Node-RED nodes for Raspberry Pi gpio using with redPlc nodes.
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
| Index | Funct. | Pin | Pin | Funct. | Index |
|---|---|---|---|---|---|
| 3V3 | 1 | 2 | 5V | ||
| 2 | GPIO02 | 3 | 4 | 5V | |
| 3 | GPIO03 | 5 | 6 | GND | |
| 4 | GPIO04 | 7 | 8 | GPIO14 | 14 |
| GND | 9 | 10 | GPIO15 | 15 | |
| 17 | GPIO17 | 11 | 12 | GPIO18 | 18 |
| 27 | GPIO27 | 13 | 14 | GND | |
| 22 | GPIO22 | 15 | 16 | GPIO23 | 23 |
| 3V3 | 17 | 18 | GPIO24 | 24 | |
| 10 | GPIO10 | 19 | 20 | GND | |
| 9 | GPIO09 | 21 | 22 | GPIO25 | 25 |
| 11 | GPIO11 | 23 | 24 | GPIO08 | 8 |
| GND | 25 | 26 | GPIO07 | 7 | |
| 27 | 28 | ||||
| 5 | GPIO05 | 29 | 30 | GND | |
| 6 | GPIO06 | 31 | 32 | GPIO12 | 12 |
| 13 | GPIO13 | 33 | 34 | GND | |
| 19 | GPIO19 | 35 | 36 | GPIO16 | 15 |
| 26 | GPIO26 | 37 | 38 | GPIO20 | 20 |
| GND | 39 | 40 | GPIO21 | 21 |
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.
