Hi
Thanks to support I now know about noise from the sensor so have worked that all out. I'm using a 5k resistor connected to the sensor via a 3.3 V Nano IOT, but the range is only from about 85-400. I presume just changing the resistor will make no difference to the range, is this range of output as expected? I thought I might get more of a resistance range from the sensor.
Steve
Short Flex Sensor
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- barshatriplee
- Posts: 200
- Joined: Wed Mar 22, 2023 10:11 am
Re: Short Flex Sensor
Since you are using a 3.3V board, 400 is normal I think. Because when connected to an Arduino UNO, the highest analog value is more than 900.
https://learn.adafruit.com/force-sensit ... ing-an-fsr
But 80 looks too much to be the lowest value. Because, when there is no external pressure, the value must be zero as far as I can see in the adafruit documentation. If it is possible, implement your circuit with an Arduino UNO or any other 5V Arduino. Thus, you can cross-check if the sensor is behaving as described in adafruit documentation.
https://learn.adafruit.com/force-sensit ... ing-an-fsr
But 80 looks too much to be the lowest value. Because, when there is no external pressure, the value must be zero as far as I can see in the adafruit documentation. If it is possible, implement your circuit with an Arduino UNO or any other 5V Arduino. Thus, you can cross-check if the sensor is behaving as described in adafruit documentation.
Last edited by barshatriplee on Wed Mar 29, 2023 11:30 am, edited 1 time in total.
- barshatriplee
- Posts: 200
- Joined: Wed Mar 22, 2023 10:11 am
Re: Short Flex Sensor
Since you are using a 3.3V board, 400 is normal I think. Because when connected to an Arduino UNO, the highest analog value is more than 900.
https://learn.adafruit.com/force-sensit ... ing-an-fsr
But 80 looks too much to be the lowest value. Because, when there is no external pressure, the value must be zero as far as I can see in the adafruit documentation. If it is possible, implement your circuit with an Arduino UNO or any other 5V Arduino. Thus, you can cross-check if the sensor is behaving as described in adafruit documentation.
https://learn.adafruit.com/force-sensit ... ing-an-fsr
But 80 looks too much to be the lowest value. Because, when there is no external pressure, the value must be zero as far as I can see in the adafruit documentation. If it is possible, implement your circuit with an Arduino UNO or any other 5V Arduino. Thus, you can cross-check if the sensor is behaving as described in adafruit documentation.
- Bipman
- Posts: 14
- Joined: Wed Jan 11, 2023 6:29 pm
Re: Short Flex Sensor
I've got one somewhere so I'll give it a go thanks.
Steve
Steve
- adafruit_support_mike
- Posts: 67454
- Joined: Thu Feb 11, 2010 2:51 pm
Re: Short Flex Sensor
That's incorrect.
The flex sensor is a variable resistor. Putting it in series with a fixed-value resistor gives you a voltage divider that makes the flex sensor's change in resistance visible. Using a lower fixed-value resistance makes the flex sensor span more of the voltage divider's range.
Please be positive and constructive with your questions and comments.