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@redplc/node-red-rpi-mcp3424

v2.0.5

Published

Node-RED node for mcp3424 18bit adc using with redPlc nodes.

Downloads

59

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Links

Maintainers

redplcredplc

Keywords

node-rediotredplcplccontrolraspberry pirpianalogadcanalog to digitalmcp3421mcp3422mcp3423mcp3424mcp3425mcp3426mcp3427mcp3428

Readme

@redplc/node-red-rpi-mcp3424

platform platform platform

Node-RED node for mcp3424 18bit adc using with redPlc nodes

mcp3424 analog to digital converter

  • 12..18bit Conversion Resolution.
  • Four Analog Inputs.
  • Each input can be disabled.
  • Internal Voltage Reference.
  • Internal Oscillator.
  • Programmable Data Rate 3.75 SPS (18bits) to 240 SPS (12bits).
  • The PGA offers input ranges from ±256 mV to ±2048 V.
  • I2C Interface with Eight Pin-Selectable Addresses.
  • Works also for mcp3421..mcp3428

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 input number for easy handling.
  • This node works on Raspberry Pi with 32bit or 64bit OS.
  • Input voltage more than VCC can damage adc input.
  • The output value is mV or adc raw data.
  • Works also on Raspberry Pi 5
  • Enable I2C with raspi-config.
  • If other type then mcp3424 used, set correct parameter (see table below).
  • If you use i2c-0 port add dtparam=i2c_vc=on to /boot/config.txt, then Pin27=SDA, Pin28=SCK.
  • For other ports add this to /boot/config.txt.

Array Index

|Input|Array-Index |:----|:---:| |CH1|0| |CH2|1| |CH3|2| |CH4|3|

Address Pin Connection

|I2C Address|ADR0 Pin|ADR1 Pin| |:----|:---|:---| |68H|Open|Open| |68H|GND|GND| |69H|GND|Open| |6AH|GND|VCC| |6BH|VCC|GND| |6CH|VCC|Open| |6DH|VCC|VCC| |6EH|Open|GND| |6FH|Open|VCC|

Supported Devices

|Type|# Channel|Max. Resol.|Address-Range| |:---|:---:|:---:|:---| |mcp3421|1|18bit|68H| |mcp3422|2|18bit|68H| |mcp3423|2|18bit|68H-6FH| |mcp3424|4|18bit|68H-6FH| |mcp3425|1|16bit|68H| |mcp3426|2|16bit|68H| |mcp3427|2|16bit|68H-6FH| |mcp3428|4|16bit|68H-6FH|

Example

This example reads temperature from sensor LM35 (DZ). The temperature sensor LM35 (DZ) outputs voltage 10.0 mV/°C. The sensor measures in the range of 2°..150°. Therefore the output is 20mV..1500mV. The module node mcp3424 is set for input CH1 and CH2 to Input-Range 2048mV. Other adc inputs are disabled. The redPlc calculate node divides adc value to 10. The redPlc export nodes reads the analog variables and sends to Dashboard gauge.