Curling stopwatch DIY
This is my second version of the curling training stopwatch. The major improvements in comparison to the older version are: better power management, stable software and new control function.
The new system has two photocells, where the master of the system is the stop one. The start photocell is a slave, like the other module. There are two ways to show the information from the system: first one with a smartphone connected via Bluetooth to the Stop photocell. The second one is a dedicated slave module (like the Start photocell) where the communication between modules is made with a nRF24l01 (I use the version with pa+lna). In my redesign I only updated the software of my old display module but I didn’t do any other change because I chose to develop a better Android app to show the information.
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