Be aware that hall sensors consume a lot of power per switch and reed switches consume virtually zero power.
In particular the A3144 you mention typically consumes 4.4mA and can consume up to 9mA. Going with an easy rough overestimating calculation I get, 10mA * 64 devices = 640mA = 0.64A.
Compare that to reed switches which consume roughly 0A for 64 switches. (note both reed and hall need pull-ups that consume power as well)
Good quality reed switches will last for 1,000,000 or more closures, whereas hall switches have infinite switching life. So if you need more than a 1 million closure life you will need to use a different technology.
Some of the newer hall switches, have built-in sleep timers to reduce the power consumption significantly by only periodically waking and reading the sensor before latching the output state. It's been a few years since I looked but my memory is that some of them get well below 0.1mA.
In particular the A3144 you mention typically consumes 4.4mA and can consume up to 9mA. Going with an easy rough overestimating calculation I get, 10mA * 64 devices = 640mA = 0.64A.
Compare that to reed switches which consume roughly 0A for 64 switches. (note both reed and hall need pull-ups that consume power as well)
Good quality reed switches will last for 1,000,000 or more closures, whereas hall switches have infinite switching life. So if you need more than a 1 million closure life you will need to use a different technology.
Some of the newer hall switches, have built-in sleep timers to reduce the power consumption significantly by only periodically waking and reading the sensor before latching the output state. It's been a few years since I looked but my memory is that some of them get well below 0.1mA.
Statistics: Posted by Paul Hutch — Fri May 10, 2024 1:11 pm