| esp8266 | ht1621 |
|---|---|
| GPIO4 | CS |
| GPIO13 | DATA |
| GPIO14 | WR |
| esp8266 | MCP23S17 |
|---|---|
| GPIO16 | CS |
| GPIO14 | SCK |
| GPIO13 | SI |
| GPIO12 | SO |
| MCP23S17 | WHAT |
|---|---|
| GPA0 | LED UP |
| GPA1 | LED DOWN |
| GPA2 | SCREEN LED |
| GPA3 | ??? |
| GPA4 | GRINDER (header ???) |
| GPA5 | PUMP WATER (water is hot) (header pin5) |
| GPA6 | WARMING PAD (header 1) |
| GPA7 | ??? |
| GPB0 | BUTTON 1 |
| GPB1 | BUTTON 2 |
| GPB2 | BUTTON 3 |
| GPB3 | ??? |
| GPB4 | ??? |
| GPB5 | ??? |
| GPB6 | BUTTON DOWN |
| GPB7 | BUTTON UP |
With the board facing away from you the header pins start at 1 from the left.
In order to brew coffee predicably, we'll need to know how the hardware timings work
- From cold start to first drop: 25sec
- From first drop to full pot: 6min 30sec
http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf