CUSTOMER REQUIREMENTS
MR.1– The base station, temperature and color modules will wirelessly communicate with one another.
MR.2 – The system will accurately regulate the mash’s temperature, dependent upon the user selected recipe.
MR.3– The system will log data from all sensors to a csv file that will be made accessible to the user.
MR.4 – The color detection system will be able to identify the where the beer rates on the SRM (Standard Reference method) color chart.
MR. 5– The temperature sensor nodes will universally connect to any mash kettle.
MR. 6 – The 7” touchscreen on the base station will displaying all of the data.
MR.7 The base station should be able to connect to the WiFi network of the home and should be portable, which means the data transfer range should be 10 meters (32 ft) or more.
MR.8 The complete systems should be of a plug and play format and will contain a troubleshoot guide if any queries or problems arise.
MR.9 Each module will have a custom enclosure.
MR.10 Thermocouple sensor should be easily replaceable on the temperature module.
ENGINEERING REQUIREMENTS
ER.1 All nodes should have a data transfer range of ten meters (32 ft.) or greater using wireless technology from a Zigbee 802.15.4 Module XBee ZB S1 TH PCB Antenna operating in the 2.4 GHZ frequency ban
ER.2 All Nodes should be powered by a 5 V DC connection and must include an on/off switch excluding the relay node
ER.3 The temperature node shall use a thermocouple sensor that are able to measure temperatures between 32°F - 212°F (0°C - 100°C) and shall have a measurement, repeatability and reproducibility accuracy of ±0.5 °F (±0.25 °C)
ER.4 The temperature node shall be connected to an on-board processor preferably a PIC18F45K20, that has the capability to send and receive data from the base station
ER.5 The base station will use a Raspberry Pi 3, with Quad Core 1.2GHz Broadcom BCM 2837 64bit CPU, 1GB RAM, BCM43438 wireless LAN and Bluetooth Low Energy (BLE) on board, 40-pin extended GPIO, Micro SD port for loading your operating system and storing data and an upgraded switched Micro USB power source up to 2.5 A.
ER.6 The color node shall have a led source of λ=430 nm blue wavelength light.
ER.7 The color node shall have a photometric sensor that is sensitive to λ=430 nm.
ER.8 The color sensor shall be able to measure color between 1.0 SRM (Pale-Yellow Color) and 20 SRM (Black).
ER.9 – The relay module will use Solid state relays (SSR), capable of turning on and off a 4450-Watt heating element to increase the brew’s temperature to the proper range during the mash step.
ER. 10 – The GUI will use a python powered system to display data vital to the user’s experience.