When creating an MVP (minimum viable product) we should try to limit the number of physical items as much as we possibly can. Increase countdown seconds – rotary encoder turn rightĭecrease countdown mins – rotary encoder turn leftĭecrease countdown seconds – rotary encoder turn left Increase countdown mins – rotary encoder turn right Power off – turn power switch to the left Power on – turn power switch to the right Now – let’s decide how our physical controls can initiate those actions. Increase countdown seconds – adjust the countdown timer on the deviceĭecrease countdown mins – adjust the countdown timer on the deviceĭecrease countdown seconds – adjust the countdown timer on the device Increase countdown mins – adjust the countdown timer on the device Power off – cut power to the device, turn it off Power on – give power to the device, start it up Once we know these we can determine what physical controls our device needs. Next – let’s list the actions that the user will want to execute when interfacing with our device. All my previous devices needed to be connected to a USB socket, so this will be an exciting step forward for me. I have some Lithium ion polymer batteries and charging modules, so I can use them along with a step-up convertor to get a steady 5 volts for my microcontroller. Project box – the device needs to be contained inside a small box which can survive in a kitchen setting I grabbed some components that I think could be used in the device Lights – for a visual alarm at the end of the countdown and to show the mode statusīattery pack – to power the device as it needs to be portable Speaker – for an audible alarm at the end of the countdown Several buttons to set mode / start and stop timer On/Off switch – a switch that turns power to the device on and off The basic requirement is a device that allows a countdown timer to be set, for a certain number of minutes and seconds, after which the device audibly and visually alerts that the countdown is complete.įirstly – let’s brainstorm the key components that we know will be used in our device.Ĭlock – a display showing visually how many minutes/seconds are left in the countdown I’m writing this blog post while I’m building the device, hopefully this will make it more interesting as I’m sure I’ll come up against some problems and this will document solutions that I find. We don’t have one in our kitchen and it feels like the perfect project for a hot August weekend. In this project I plan to design and build a kitchen timer.
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