iot4-0521-01 (16 analog input 0-20ma)

The board consists of the mcu-ESP8266 module and 4 modules with ADS1015 for the A / D conversion of the 16 inputs. The chip shown converts the analog size to 11 bits + sign. By inserting in parallel to the inputs 100 ohm resistors e program the PGA to a gain of 2 there are current inputs (0-20mA). If 100k resistors are used on the PCB, we get a multichannel voltmeter with inputs at voltages below the 3 volt supply of the chip. But by means of resistances of the dividers provided on the PCB the voltages can be higher. If you need more precision you can use the modules with ADS1115 which offer a resolution of 15bit + sign. The values ​​of the inputs are shown locally on the display. Values ​​that are sent from the esp8266 MCU via WiFi to the remote server connected to the network.