What is it?

Using an ESP32-S2 controller, this device can sample 8 onboard analog inputs, any device connected to the I2C, SPI or UART header interface, storing the data to an onboard SD card, and or sending to a server over WIFI

Why did you make it?

• Designed and built to monitor the discharge cycle of many batteries at once. With the server interface I could keep an eye on voltages from anywhere. Additions to the digital IO allowed external sources to be enabled, charging the batteries, or enabling loads to discharge
• Has been used further to sample particle monitors, store data to a webServer for tracking with LEDs locally to show immediate levels of bad particles output from a laser cutter.
• Using this board, a DB level meter was created showing how loud the current environment was on the 12 LED board that I also sell.

What makes it special?

The inputs can be from a multitude of devices, voltages can be measured from sensors like temperature, light or humidity for example. Others can be monitored over I2C like particle monitors, accelerometers or even more ADCs. The UART can be used for taking data from a GPS receiver for example

What is received?

Buyers will receive an all parts soldered and tested product with example code that can be saved onto the ESP32, with also example code that can run on a server to receive data to publish onto websites Where possible I like to run the RTC for at least a week and have it calibrated before shipping, but I try to keep a stock of boards ready calibrated and ready to go.