Using normally closed pressure sensor with arduino board to avoid the energy consumption of monitoring

Other Hardware Sensors
1

Hi, sorry for a little bit a noobie question. I am trying to devise a pressure sensor with an arduino board that only fires when the pressure sensor is released (ie. the weight comes off the pressure sensor). I am trying for the sensor and arduino board not to use any energy to constantly monitor the pressure sensor (24 hours a day, 7 days a week) so as to avoid draining the battery. By going through chatgpt, it suggested using a "normally closed pressure sensor" to do this. Is that the right route to have the pressure sensor fire only when the weight comes off it without the need to constantly use energy.

2

Must it be battery operated ? or can you use a wall adapter ?
Which Arduino board do you have in mind ?
If you want to measure weight, then you need a weight sensor.

3

A pressure sensor switch could be used to power up the Arduino and do something when "the weight comes off". Depends on the switch configuration.

Alternatively you put the Arduino to deep sleep, with wakeups every so often to check the sensor.

4

You might ask the robot again.

5

This is the part where a link to what you call a pressure sensor would help as well as what Arduino you are using or plan to use.

Ron

6

Do you need an Arduino? What will be its role that it plays?

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An FSR of suitable range combined with an appropriately sized series resistor you can get the output voltage when pressed to be a LOW signal, and the output voltage when released can be a HIGH signal. That can wake up an Arduino.

Of course you do have a little current flowing through the FSR and its series resistor at all times, that can't be avoided. It can be limited to <100µA for sure.

Another option is a pressure switch, which when pressed is open, then closes when the pressure is released. No power consumption when the switch is open of course, a small current when the switch is closed. Again this can be used to wake up an Arduino.

I can't think of simple systems that only produce a short signal upon state change.

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