PCF8591

From Let's Control It
Jump to: navigation, search

Introduction

The ESP-01 module has no analog input. Only boards like the ESP-07 and ESP-12 break out the single ADC (TOUT) pin on the ESP chip. But we can provide all ESP modules with 4 analog inputs using the PCF8591 I2C ADC chip.

Hardware

PCF8591Module.jpg PCF8591.jpg

The PCF8591 can be bought on eBay as a bare chip or a plug and play module.

Software

Custom Sketch

ESP Easy

Use the device tab on the ESP Easy webinterface and create a new task by editing one of the available tasks. Select "PCF8591 Analog input" from the dropdown box.

EasyConfigPCFA.png

Enter the IDX found in the Domoticz device page. Also select the port on the PCF8591 that you want to read (Numbered 0 - 3). That should be all.

Optional settings

Use of formulas

Use of value names

ESP Connexio

Command:

ExtWiredAnalog <poort>, <Variabele>
Parameter: Beschrijving: Bereik: Opmerking:
Poort 1 t/m 32
Variabele 1 t/m 15

Sample

ExtWiredAnalog 1,3