3 Dollar Speaking Thermometer Using an ATTINY85 - Please Watch the Video

This is a 3 dollar speaking thermometer using an ATTINY85 to read temperature from a a Dallas DBS1820 thermometer and announce it every 30 seconds through a DF Player Mini.

To do this you need to build the circuit shown above

You need

A DFPlayer Mini

ATTINY85

Breadboard and 3.3 volt power supply

A passive speaker ( I used a recycled one from Poundland)

A DBS1820 Dallas thermometer

An SD card, ideally 4 gb or less (FAT32)

Arduino IDE environment and UBASP avr programmer

You then need to download the code from https://github.com/scanos/connectmyplace/blob/mai... To program the ATTINY85 use the following links,https://www.instructables.com/15-Dollar-Attiny85-HOW-TO-PROGRAM-IT/

You then need to format an SD card in FAT32 format and add your mp3 files to it. Each MP3 file corresponds to a number but there is an offset of 30 so that 0.mp3 is -30C etc. The files must be numbered 000x.mp3 as shown in the image above.

This is a very effective yet simple circuit. The modus operandi is that the temperature is announced every 30 seconds so could be used to check for hot and cold spots in buildings or domiciliary care etc.