Final part on a prototype of time based high voltage power supply controller using ESP8266 and relay module. I added the buzzer, tried usb power supply module, and did the final test on the circuit... Part 1: https://www.youtube.com/watch?v=639YIeMRmho Part 2: https://www.youtube.com/watch?v=rsTtjtg6vhE You can find the code here: https://github.com/ttarnowski/100DaysOfCodeInIoT/tree/Day7 Social Media: Twitter: https://twitter.com/t_tarnowski​ Linkedin: https://www.linkedin.com/in/tomasz-ta...​ Signup for my newsletter: https://tomasztarnowski.com/#newsletter GitHub: https://github.com/ttarnowski​ Parts and components used in the video: High Voltage: Extension Lead Cable: UK: https://www.amazon.co.uk/s?k=extension+lead+single US: https://www.amazon.com/s?k=extension+lead+single Couldn't find coffee maker model, sorry. Low Voltage: Option 1 (simplest): - ESP8266 microcontroller (~5$ a piece): UK: https://www.amazon.co.uk/s?k=nodemcu+esp8266 US: https://www.amazon.com/s?k=esp8266 - Development kit: UK: https://www.amazon.co.uk/ELEGOO-Electronic-Breadboard-Potentiometer-compatible/dp/B01ERP6WL4/ref=sr_1_9?dchild=1&keywords=elegoo+starter+kit&qid=1617284544&sr=8-9 US: https://www.amazon.com/EL-CK-002-Electronic-Breadboard-Capacitor-Potentiometer/dp/B01ERP6WL4/ref=sr_1_8?dchild=1&keywords=elegoo+starter+kit&qid=1617284844&sr=8-8 - Relay module: UK: https://www.amazon.co.uk/s?k=relay+module+5v US: https://www.amazon.com/s?k=relay+module+5v - AC to DC Adapter: UK: https://www.amazon.co.uk/s?k=ac%2Fdc+adapter US: https://www.amazon.com/s?k=ac%2Fdc+adapter - micro USB cable: UK: https://www.amazon.co.uk/s?k=micro+usb+cables US: https://www.amazon.com/s?k=micro+usb+cables or (for mac) UK: https://www.amazon.co.uk/s?k=type+c+to+micro+usb US: https://www.amazon.com/s?k=type+c+to+micro+usb Option 2 (independent parts): - ESP8266 microcontroller (~5$ a piece): UK: https://www.amazon.co.uk/s?k=nodemcu+esp8266 US: https://www.amazon.com/s?k=esp8266 - Breadboard: UK: https://www.amazon.co.uk/s?k=breadboard US: https://www.amazon.com/s?k=breadboard - LED diode: UK: https://www.amazon.co.uk/s?k=led+diode US: https://www.amazon.com/s?k=led+diode - Button: UK: https://www.amazon.co.uk/s?k=arduino+push+button US: https://www.amazon.com/s?k=arduino+push+button - Buzzer: UK: https://www.amazon.co.uk/s?k=passive+buzzer US: https://www.amazon.com/s?k=passive+buzzer - Power supply module: UK: https://www.amazon.co.uk/s?k=breadboard+power+supply+module+3.3v%2F5v US: https://www.amazon.com/s?k=breadboard+power+supply+module+3.3v%2F5v - AC to DC Adapter: UK: https://www.amazon.co.uk/s?k=ac%2Fdc+adapter US: https://www.amazon.com/s?k=ac%2Fdc+adapter - Wires: UK: https://www.amazon.co.uk/s?k=arduino+wires US: https://www.amazon.com/s?k=arduino+wires - micro USB cable: UK: https://www.amazon.co.uk/s?k=micro+usb+cables US: https://www.amazon.com/s?k=micro+usb+cables or (for mac) UK: https://www.amazon.co.uk/s?k=type+c+to+micro+usb US: https://www.amazon.com/s?k=type+c+to+micro+usb Optional: - Battery box: UK: https://www.amazon.co.uk/s?k=battery+case+holder+arduino+2+slots US: https://www.amazon.com/s?k=battery+case+holder+arduino+2+slots Alternative to standard Power Supply Module and AC to DC adapter: - USB Power Supply: UK: https://www.amazon.co.uk/s?k=Serial+Converter+Adapter+Module+usb+3.3v+5v+ttl US: https://www.amazon.com/s?k=Serial+Converter+Adapter+Module+usb+3.3v+5v+ttl - Step-down voltage regulator 5v to 3.3v: UK: https://www.amazon.co.uk/s?k=ams1117-3.3+step-down US: https://www.amazon.com/s?k=ams1117-3.3+step-down Software used in the video: 1. Visual Studio Code IDE: https://code.visualstudio.com/ 2. C/C++ VSCode extension: https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools 3. Clang-Format VSCode extension: https://marketplace.visualstudio.com/items?itemName=xaver.clang-format 4. PlatformIO VSCode extension: https://marketplace.visualstudio.com/items?itemName=platformio.platformio-ide Thanks for watching and see you tomorrow! 00:00 Introduction 00:38 Connecting the buzzer 03:43 Circuit summary 06:30 Testing the "test circuit" with the buzzer connected 07:56 Trying different, usb power supply with step-down voltage regulator 12:21 Quick test with usb power supply 13:22 Connecting high voltage circuit to the relay 15:50 Last code modification (waiting time increase) 17:40 Final test with the Coffee Maker - preparing the coffee and connecting everything 20:38 Switching on the device 21:24 Relay switches off 22:13 Plan for tomorrow and end of the last part