DIY Solar Panel Monitoring System

I have designed a new PCB by incorporating all the features that i have explained in my last log.

I have designed a new PCB by incorporating all the features that i have explained in my last log.

I have drawn a new schematic with the following new features

1. Replaced the ESP32 development board with onboard ESP32­ WROOM-­32 to reduce the power consumption. Also added the USB programming interface.

2. Replaced the XL7015 module by using an onboard buck converter for the power supply

3. Added battery charging circuit for using a Li-ion battery as backup 

4. Added two new I2C ports for using additional sensors

5. Added SD card slot for storing the data for analysis

6. Added an external ADC ( ADS1115 )  for accurate analog readings 

7. Added a voltage reference IC for getting a stable voltage reference for  calibration of sensor readings

I have drawn the schematic by using EasyEDA online software and then designed a custom PCB for this project. The PCB is designed for mounting the different modules instead of using a lot of components. I have ordered my PCB from JLCPCB and received it within 7 days.

You can download the Gerber files attached below.

To give a nice commercial product look, I have designed an enclosure for this project by using Autodesk Fusion 360. The dimensions of all the components and PCB mounting holes are measured by a vernier caliper then the same were considered during the design.

The enclosure has two parts: 1. Main Body 2. Top Lid The

The main body is basically designed to keep the PCB board. The top lid is to cover up the main body opening and mount the OLED display.

I used my Creality CR-10 printer and 1.75 mm green PLA filament to print the parts. It took me about 6 hours to print the main body and around 2 hours to print the top lid. My settings are:

Print Speed : 60 mm/s

Layer height: 0.2mm ( 0.3 also works well)

Fill Density: 20%

Extruder Temperature: 200 deg C

Bed Temp: 60 deg C

Download the STL files from Thingiverse