4-Channel I2C 4-20mA Current Receiver Board w/ I2C Interface

sepp182 · August 28, 2021, 12:12pm

i didnt find any step by step - Explanation / Blog Site
Code
für Raspberry Pi
Some Example / HowTo
for

for Logging 2 or 3 or 4 4-20ma Sensors

some lib or something online

like for example https://www.az-delivery.de/en/products/2-relais-modul-kostenfreies-e-book

igor_X · August 29, 2021, 2:49pm

Hi @sepp182 and welcome to our forum!

You can find some resources on manufacturer’s website: https://store.ncd.io/product/4-channel-i2c-4-20ma-current-receiver-with-i2c-interface/

sepp182 · September 11, 2021, 7:10pm

i read everything, and searched the web a lot but i cant read channel 2 (or 3 or 4) of the board
allways the value of channel 1 is displayed .

pi@raspberry#~ i2cget -y 0x68 0x00 w
0x01
0x02
change this parameter does not change the printed value !

github.com

ControlEverythingCommunity/MCP3428/blob/master/C/MCP3428.c

// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// MCP3428
// This code is designed to work with the MCP3428_I2CADC I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Analog-Digital-Converters?sku=MCP3428_I2CADC#tabs-0-product_tabset-2

#include <stdio.h>
#include <stdlib.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <fcntl.h>

void main() 
{
	// Create I2C bus
	int file;
	char *bus = "/dev/i2c-1";
	if((file = open(bus, O_RDWR)) < 0) 
	{
		printf("Failed to open the bus. \n");

This file has been truncated. show original

35 char reg[1] = {0x00};

change to 0x01

no Effect ?

thx