Hello, we use cyc84148AZI to design our faucet project. we use two channels to sense object(like hand) one for faucet , another for Soap pump. the system has two parts, one is called universal controller, there are two buttons and led display for monitor and setting on the controller, other part is sensor with cypress chip. the controller supply 3.3v to sensor . the system is basically work, but we cannot understand some phenomena.
We have three ways to handle steel sink: faucet shield connected to the sink, ground connected to the sink, and sink floating(no connection of any ground or shield.
- When the sink is ground or float, touch sink will cause both faucet and soap signal go up that could cause fake trigger, while when sink is connected to faucet shield, the both signals go down that could prevent false trigger
- In all scenarios , when grab universal controller or touch button, both senses signal of faucet and soap will rise, that can cause false activation
- When touch faucet or soap spout , the touching signal will go to saturation value, the non-touched signal will drop down
- When sink is shield the approached signal will increase much, while the other signal will increase a little. as for sink grounded or floating, the non-approached signal will keep unaffected
We are not clear why it work like that and how can we prevent from some performances that can cause fake activation, like grabbing universal controller cord, tapping the sink or pressing universal controller buttons.
could you please explain why like this and give us a solution
Thanks
soap pumper.
