1.0.10 • Published 3 years ago
node-red-contrib-redplc-rpi-pcf8574 v1.0.10
node-red-contrib-redplc-rpi-pcf8574
Node-Red node for pcf8574/pcf8574a 8bit I/O Expander
Node Features
- 8 x Digital Inputs or Digital Outputs
- Inputs with Pullup
- Outputs are Active Low
- Eight selectable Device Addresses for pcf8574
- Eight selectable Device Addresses for pcf8574a
Install
For using with Ladder-Logic install redPlc nodes
For using with other nodes, install module nodes
Install with Node-Red Palette Manager or npm command:
cd ~/.node-red
npm install node-red-contrib-redplc-rpi-pcf8574Usage
This node reads/writes from/to Node-Red global variables Update is triggered by redPlc cpu node or module-update node This node works only on Raspberry Pi with Raspberry Pi OS Enable I2C with raspi-config. Consult datasheet for absolute maximum ratings
Digital Input (Variable I):
Digital Output (Variable Q):
| Pin | Bit |
|---|---|
| P0 | 0 |
| P1 | 1 |
| P2 | 2 |
| P3 | 3 |
| P4 | 4 |
| P5 | 5 |
| P6 | 6 |
| P7 | 7 |
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