** 3.7V LiPO battery not included but a wire with 1.25mm connector is provided **

This project uses an ESP32-S3 processor along with an MLX90640 thermal imaging sensor. Using the bare chip allowed everything to fit on the backside of a 1.69" screen. Previous revisions used a SPI bus but the refresh rate was too slow. Changing to an 8-bit bus type improved this dramatically. The MLX90640 image sensor and MAX17048G+ liPo monitor are on the same i2c bus. Two right angle pushbuttons are on one side if needed and two small vertical ones needed when first powering up the board to bring up the com port. When first plugged in the com port will appear and disappear over and over. Holding down the boot button (B) and tapping the reset (R) button once sorts this out. The original sketch here: https://github.com/Uspizig/MLX90640 was very helpful in getting things up and running. It has since been modified to use the TFT_eSPI library needed for the faster bus and tighter code.

Hardware used on this board

• -Processor (ESP32-S3FN8)
• -1.69" LCD (https://www.buydisplay.com/1-69-inch-color-280x240-round-rectangle-ips-tft-lcd-display-panel-st7789)
• -3.3V LDO (HT7833)
• -LiPo charger (MCP73831T-2ACI)
• -LiPo connector (1.25mm JST type)
• -Thermal Sensor (MLX90640ESF-BAB-000-TU)
• -LiPo battery monitor (MAX17048G+)

FAQ

How do I updload my own sketch?

• -Plug the board into your pc. If your com port appears and disappears over and over, hold down the B (Boot button), tap on the R (Reset) button, let go of the Boot button. This should hold the com port
• -Install the latest Arduino IDE, install the ESP32 Board libraries, Install the sensor libraries, Install an older TFT eSPI library 2.5.43 or compile issues may appear, delete the UserSetup.h and UserSetup_Select.h files and replace with mine
• -Upload your sketch

Where do I get a battery?

• -Source a 300mAh to 500mAh LiPo with a 1.25mm battery from Aliexpress. Just make sure the positive and negative wires are in the correct locations as noted on the board. If not, they can be removed by lifting the tab and swapping around

Why does my battery never charge?

• -The charger cannot power the board and charge the battery at the same time. To properly charge the battery turn the device off and leave the USB-C plugged in. The red light will go off once charged

Why is this often out of stock?

• Each board is hand assembled using a hot plate and hot air wand. Parts are usually purchased in small quantities in case it does not sell. Proper testing, packaging and hardware debugging takes time

A video describing it in detail is located here: https://youtu.be/gFyTLF9ZPXU?si=N3TifqqDhR3nqf9g