---
growth: sprout
---
# Concepts — PSB (Post Secondary Brewing)

Chris and Susan's craft brewery. Three agents: psb-thinking (planning), psb-gemma (brewhouse ops), psb-business (business side).

## Active Projects

| Project | Status | Key Concepts |
|---------|--------|---------------|
| Fermentation Dashboard | Planning | Home Assistant, TILT hydrometer, Grafana, dashboarding |
| Brewery PID Replacement | Prototyping | ESP32-S3, ESPHome, Home Assistant, PID, PT100, custom PCB |
| Toast POS | In use | Point of sale, product mix reports, email export |
| Pi-hole (brewery) | Not started | DNS, ad-blocking (separate from home Pi-hole) |

## Core Skills

- **Brewing chemistry** — fermentation, yeast, malt, hops
- **Home Assistant** — telemetry dashboards, TILT integration
- **ESP32/ESPhome** — brewery sensor integration
- **Toast POS** — sales reporting, product mix analysis
- **PCB design** — custom PID controllers (Chris's growing skill)
- **PID control** — temperature regulation for brewing vessels

## Knowledge Dependencies

```
Brewery PID Control
├── Temperature sensing (PT100, MAX31865)
├── PID algorithm fundamentals
├── ESP32-S3 + ESPHome
├── Home Assistant integration
└── Solid-state relay (SSR) control

Fermentation Dashboard
├── Home Assistant ( Lovelace dashboards)
├── TILT hydrometer / Bluetooth bridge
├── Grafana (optional, for pretty charts)
└── ESP32 bridge programming

Toast POS
├── Report generation (product mix)
├── CSV export
├── Email automation
└── Google Sheets integration
```

## Gap Analysis for Chris (at brewery)

Chris is strong on: brewing, electronics, PCB design
Chris is weak on:
- **Home Assistant YAML** — configuration, automations, templating
- **Dashboard design** — making data look good (Grafana, Lovelace)
- **Software integration** — wiring multiple systems together

## Recurring Topics

1. **Temperature control** — PID for vessels (HLT, mash tun, boil kettle, fermenters)
2. **Home Assistant** — telemetry dashboards, sensor integration
3. **Custom hardware** — ESP32 + PT100 + SSR for temperature control
4. **Data visualization** — making fermentation data readable
5. **PCB design** — custom brewery controller boards