We see more watch PCB exchange projects because there are more people working on these projects, or because we saw a project and it came to our minds? The world may never know, but when it comes to design constraints, here is a very interesting challenge, both to install your electronic magic within the confines of an injection molded case, and to put your creation on the straw in the power budget Run battery power.
Just this morning, we met [Joey Castillo’s] Sensor watch project. He chose Casio F-91W as a donation watch. It has a segment LCD display with a classic Casio appearance, capable of displaying hours, minutes and seconds, as well as date and date. But the added benefit is that we know they have good water resistance, while still providing three buttons for user input.Of course, it has fewer buttons than the pink calculator watch we saw [Dave Darko] Worked earlier this week, but which one in the pool would you trust?
We saw [Joey] I also chose to use the ATSAML22 microcontroller and explain why: it includes a built-in segment LCD controller!If you are a peripheral geek like us, you can Read about the SLCD controller on page 924 of the data sheet (PDF), it is a complete data sheet.
The sensor part of the sensor watch is a flexible PCB tap that allows you to replace any sensor that suits your needs.The first to be refluxed [Joey’s] The bench is a BME280 humidity sensor, which is most obviously useful for the temperature measurement included, but maybe it can also alert when moisture enters? [Joey] Say you can replace other parts as long as they are within the QFN or LGA size range. We think IMU is appropriate because there are a lot of interesting interactions, such as the reaction of the watch to being placed in front of you, or click-based input.
We think it’s great to start with donating watches, because pulling out a watch case, especially a waterproof watch, is 97% of the battle. But when your UI is unique to the watch world, sometimes you need to start from scratch like this wooden clock watch.