Elegoo 37 sensor kit

I’ve tried out the laser module which works great. I’ve connected it to the 5 volt output of my Wemos D1 esp8266 and the signal on the D4 pin.

The code (very basic) is on https://github.com/paulgreg/Elegoo-37-sensors-kit/tree/main/laser

I’ve tried the RGB LED modules (both the normal led and the SMD version).

They work great on 3.3 V. You can find a basic demo version here : https://github.com/paulgreg/Elegoo-37-sensors-kit/tree/main/SMD-RGB

I’ve tried the humidity / temperature module with an esp8266 and an Oled I2C screen.

The module is connected to d5 / GPIO14 and works great in 3.3V.

You can find the example code here.

Also, I’m using it in my eCO2 sensor project to add more precision to the SGP30 sensor.

The first module I tried is the LCD 1602, connected to an ESP8266 Wemos D1.

Connection are a little bit different than for an arduino. I’ve found a great explanation on that nice french blog.

Instead of using a potentiometer, I’ve directly connected the V0 pin to ground to set maximum contrast.

You can find the example code here.

The kit includes a power supply module.

It is designed to be mounted on a full size breadcrumb and can output 2 voltage (one for each row).

Voltage can be selected by a jumper : 3.3 V or 5 V.
The switch next to the pin turns on or off the module.

I’ve used a 12 V HDD power adapter that fitted perfectly.