I belong to a Kendo club in France.
We bought a timer to pace our sessions.
Unfortunately, the sound of the round start and end beeps is too quiet for everyone to hear.
I’d like to improve this without modifying the timer.
The idea is as follows:
I would like to:
1 - Detect the word “work” on the display using a light-sensitive sensor and play an MP3 file on a speaker via Bluetooth.
2 - Detect the word “rest” on the display using a light-sensitive sensor and play an MP3 file on a speaker via Bluetooth. I thought about using this module:
My questions:
1 - Can we connect two photosensitive sensors to this module?
2 - Can we transmit to a Bluetooth speaker?
I think you might actually be able to get something to work with just the photo sensors if you still want to give it a try. The display does appear to have big, well-separated Work / Rest lights and I think you could read them without even opening (tampering?) the timer case and by simply temporarily applying sensor(s) over the front.
Have some fun with it. I’m picturing an old 70’s night light, the 1 Watt incand bulb one in granny’s bathroom still working after all these years, with the sensor side taped to the timer, monitoring the Rest light. The Timer Official starts the clock and sets the alarm, a weak electromagnet in place of the bulb and holding a steel cowbell. When Rest rises in the East, the night light powers down and the cowbell clatters to the ground. Elegant!
I actually want to place the sensors in front of the timer. I don’t want to open it and damage it. I’m not an Arduino board expert, but I’ll do my best. I wouldn’t mind some help if I’m having too much trouble.