A New Design.

A project log for Flexible Coffee Cup Buddy

The aim of this project is to design a flexible PCB that can be attached to a coffee cup and will visually represent the temperature.

Billy-BogardusBilly-Bogardus 04/27/2019 at 06:260 Comments

It has been a while since I posted.

Two weeks ago I completed the first revision of the board and was not happy with how it turned out.

First there were only 3 LED's on the board, which is OK, but I wanted more LED's.

Second, the LED's lowest supported voltage was 3.5V and the Temperature sensor chip I originally chose required a 3V power supply. Having two different Voltage levels required me to use a I2C logic level shifter and a LDO for the 3.3V supply.

For the new board I chose a smaller Microcontroller, as well as a different Temperature sensor.

I added pads so that the multiple strips can be wired together. the pads should also be compatible with standard WS2812B Strips.

For the New temperature sensors I chose the LM75BDP,118 from NXP because they were a good size and they used I2c.

I Chose PIC16F18426-I/ST as my processor because it was in a nice small package.