Introduction to norelite npm package

On request I’ve put together a few slides that explains the concept and structure of norelite. It might help to get started.

Norelite is an npm package for Node-RED and the nodes within the package can be used to implement your home automation requirements based on rules.

Download: norelite overview 1.5.0.pdf



Figure out the esp8266 ADC Maximum voltage

In my quest to replace my current setup of Arduinos to esp8266 to gather sensor data I’ve been struggling with getting a similar output when using an LDR (light dependant resistor). I’ve been struggling with it for quite some time and I’ve finally come to a solution.

The issue being that the output graph from the LDR with an Arduino differs quite a bit from an esp8266 with an LDR.

After browsing for more details regarding the analog pin (ADC) on the esp8266 I realized that it does not measure between 0-3.3v but from 0-1v. When you do an analogRead on the input it outputs a value between 0-1024. But after I had introduced a voltage divider to get to 1v input I was still not getting the expected results.

In order to troubleshoot I measured the output from the ADC (i.e. digitalWrite(A0,1) ) and I received 0.6v. I thought that maybe it will output the expected max input value (but actually it was half the value).

const byte LDRpin=A0;

void setup() {
 pinMode(LDRpin, OUTPUT);
 digitalWrite(LDRpin,1); //or analogWrite(LDRpin,255);

void loop() {

As a second step I wrote a small code and instead of a voltage divider I used a potentiometer to trim the input voltage to the ADC pin and the code did output 1024 when I reached 1.2v.

const byte LDRpin=A0;
volatile unsigned int ldr;

void setup() {
 pinMode(LDRpin, INPUT);

void loop() {
 ldr = analogRead(LDRpin);

As a summary the maximum voltage for my esp8266 is 0-1.2v. I don’t know if this is a common value for the esp8266 or if it was unique only for my esp8266-12e but at least there is a fairly simple way to find out.

So instead of using a 100Ω (R2) and 220Ω (R1) resistors to get to 1.0v I used 100Ω (R2) and 180Ω (R1) in the voltage divider to bring down 3.3v to 1.2v as input to the LDR. R1 was calculated using this online tool