Surplus "Buzz Off" PCBS (ESP-32 + solid state relay)
Hello again. It's been a while since I last posted, but I still have several hundred surplus "Buzz Off" PCBs available. (Photo Of Boards) Apologies for the "self promotion", but I believe the leftover boards from my failed project are a valuable resource for people who want to cheaply learn about ESP-32 or have projects that my boards will work with. Indeed I've sold them here in the past.
These are custom PCBs with an ESP-32-SOLO chip (single core ESP-32), a 1A Panasonic solid state relay, 800 mA voltage regulator, power in/out in the form of either micro-USB or a DC barrel connector that supports 5VDC - 20VDC, and a tri-color RGB LED daughter board connected by a flex ribbon connector, and a 4-pin flex connector that maps to DIO5, intended to connect to a membrane switch.
They do not have an onboard UART, so you'll need to connect a USB-Serial dongle to the three pin header on the board to do initial programming. There are links to the dongle in the blog post. Full specs are here: https://nosupports.com/posts/buzzoff-tech-info/
Price is $2.50 each. Parts cost alone to duplicate these boards is about $8 a unit. I'll do flat-rate $10 shipping for as many as will fit in a USPS Small Flat Rate Box (domestic USA). You can choose micro USB or barrel connect versions, or mix and match. If you are outside the USA, or want a bigger batch, DM me for a quote on shipping.
What can you do with these boards? You could make your own smart switch for a small DC load, or you can repurpose the 3 I/O lines that drive the RGB LED board to do something else, like read a temperature sensor. I've sold quite a few to STEM teachers who use them as a cheap platform to teach their students Arduino code, and they are very popular at my local Maker Faire.