Sensor-Controlled Coffee Grinder for Consistent Brew Strength
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Solution Overview
Problem
Domestic coffee makers require constant adjustment of water and coffee measurements for each brew, leading to variable brew quality and often result in coffee wastage or insufficient coffee due to imprecise methods.
Innovation Solution
A coffee maker with a water level sensor, controller, and coffee bean grinder that automatically adjusts the quantity of coffee grounds based on user input and water level, ensuring consistent coffee strength and flavor by controlling the grinding time and water heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If users manually measure and adjust coffee and water quantities for each brew, then they can adapt to different cup quantities, but brew quality becomes variable and measurement time increases
Solution Approach 1:
The system automatically determines the required coffee bean quantity based on water level sensor signals indicating water volume, eliminating manual measurement. The controller autonomously controls the grinder operation time and coffee dispensing amount, making the system self-regulating without user intervention for quantity adjustments.
Solution Approach 2:
The water level sensor provides feedback signals to the controller about the water volume in the reservoir. The controller uses this feedback to automatically adjust the grinder operation time and coffee dispensing amount, creating a closed-loop control system that ensures consistent coffee-to-water ratio regardless of brew size.
2Ease of operation
If users manually measure coffee quantities, then they can adjust for different brew sizes, but coffee wastage occurs due to imprecise measurements
Solution Approach 1:
The system automatically determines the exact coffee bean quantity needed based on real-time water level sensor signals. The controller precisely controls the grinder operation time and coffee dispensing amount, eliminating over-measurement and coffee wastage associated with manual estimation methods.
Solution Approach 2:
The manual mechanical measurement process (scoops, spoons, visual estimation) is replaced by an automated electronic control system with sensors and motorized grinder control. This substitution enables precise quantity determination without the errors and wastage inherent in manual measurement methods.
3Loss of time
If a fixed quantity of coffee is used for each brew, then measurement time is reduced, but coffee shortage or excess occurs requiring multiple brews
Solution Approach 1:
The system transitions from static fixed-quantity coffee dispensing to dynamic quantity adjustment. The controller automatically varies the coffee bean dispensing amount based on real-time water level sensor signals, enabling the system to adapt to different brew sizes without manual intervention while maintaining accurate coffee-to-water ratios.
Solution Approach 2:
The coffee dispensing quantity parameter is dynamically changed based on water volume detection. The controller adjusts the grinder operation time and coffee dispensing amount according to the detected water level, allowing flexible adaptation to different brew sizes while eliminating the need for fixed quantity limitations.
4Manufacturing precision
If automatic grinder control is added to determine coffee quantity, then brew consistency is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it processes water level sensor signals, determines required coffee quantity, controls grinder motor operation timing, and coordinates the brewing process. By making the controller multi-functional, the system achieves automated consistent brewing without adding separate dedicated components for each function.
Solution Approach 2:
The water level sensing system, coffee quantity determination logic, and grinder control system are merged into an integrated automated control mechanism. The controller combines these functions into a unified system that automatically adjusts coffee dispensing based on water volume, achieving brew consistency without proportionally increasing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coffee maker produces consistently strong and flavorful coffee regardless of the number of cups being brewed, simplifying the measurement process and reducing waste by accurately determining the required coffee and water quantities.
Implementation Method 1
The water level sensor comprises a float and a variable resistance device operated by a position of the float
Implementation Method 2
an in-line water heater, a brew basket for receiving coffee grounds. A delivery tube or other water passage takes water from the water reservoir, through an in-line water heater
Data Source
AI summary
A coffee maker has a water reservoir, an in-line water heater, a brew basket for receiving coffee grounds, a water passage between the water reservoir and the brew basket, a water level sensor located in the water reservoir, a water level indicator, and a controller in communication with the water level sensor and the water level indicator. The passage passes through the in-line water heater for delivering heated water to the brew basket. The controller activates the water level indicator in response to a signal from the water level sensor. A method of making coffee in the coffee maker includes determining, in the controller, an operating condition for a coffee bean grinder and operating the coffee bean grinder based on the operating condition to grind coffee beans and produce a quantity of ground coffee beans.