Espresso timer and PID

Development of a machine-independent espresso timer with a round display driven by a ESP8266 or ESP32 microcontroller. This can be used as a timer only but an additional feature is a PID.

Components:

• 1.28" TFT screen (GC9A01)
• ESP32 or ESP8266
• 220V to 3.3V converter
• Reed Sensor
• 3D printed parts
• 7 wire cable
• K-type temperature probe
• MAX6675 Amplifier
• SSR40-DA
• KY-040

Connections:

GC9A01 to ESP8266 NodeMCU V3

• RST ==> Not connected
• CS ==> D8
• DC ==> D3
• SDA/DIN ==> D7
• SCL/CLK ==> D5
• GND ==> GND
• VCC ==> 3V3

Reed Sensor to ESP8266 NodeMCU V3

• Lead1 ==> 3V3
• Lead2 ==> A0

MAX6675 probe to ESP8266

• VCC ==> 3V3
• GND ==> GND
• CLK ==> D5
• CS ==> D4
• SO ==> D7

SSR40 to ESP8266

• + ==> D1
• - ==> GND

KY-040 to ESP8266

• CLK ==> D6
• DT ==> D2
• SW ==> D0
• + ==> 3V3
• GND ==> GND

Setup steps:

1. Open Arduino IDE
2. Configure the board
3. Upload SensorTimer.ino file

Installation in machine:

1. Open espresso machine
2. Locate water pump
3. Attach Reed sensor to pump
4. Route screen cable to desired position

Notes:

• Save set temperature value to EEPROM Arduino Forum
• Video on use of PID Youtube video