hello! I am not very good with coding, but I am working on a project where I am connecting an FSR sensor to a neopixel strip. It's pretty simple: when weight is applied, the strip does its crawling rainbow effect. when weight is lifted, the lights, obviously, go off
I am not sure how to code the setup, letting my arduino know of the sensor and lighting up the strip, then loop ... help? please!! :)
thanks!
fsr>neopixel strip
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- adafruit_support_bill
- Posts: 88096
- Joined: Sat Feb 07, 2009 10:11 am
Re: fsr>neopixel strip
I'd start by connecting up the FSR and testing to make sure it is working. Have you run the code from the tutorial?
https://learn.adafruit.com/force-sensit ... ing-an-fsr
https://learn.adafruit.com/force-sensit ... ing-an-fsr
- roxanne
- Posts: 9
- Joined: Wed Dec 03, 2014 11:30 pm
Re: fsr>neopixel strip
Yes, it seems to all work fine. Now just the setup code is what I am having trouble with accurately including the pressure sensor into the rainbow code
- adafruit_support_bill
- Posts: 88096
- Joined: Sat Feb 07, 2009 10:11 am
Re: fsr>neopixel strip
So open the serial monitor and observe the output as you press on the FSR. Find the level of pressure that you want to trigger the led strip and remember that number. Then you can test for that in your code and use it to trigger the RainbowCycle from the NeoPixel StrandTest example.Yes, it seems to all work fine.
Code: Select all
fsrReading = analogRead(fsrAnalogPin);
Serial.print("Analog reading = ");
Serial.println(fsrReading);
if (fsrReading > 500) // when pressure is greater than threshold
{
rainbowCycle(5); // rainbow cycle
}
- roxanne
- Posts: 9
- Joined: Wed Dec 03, 2014 11:30 pm
Re: fsr>neopixel strip
So I think for the most part I have to declare the rainbowcycle in the scope, not sure how to work on that one. I really appreciate all your help, hope I'm not asking too much at this point !! :)
Errors:
Arduino: 1.6.3 (Windows 7), Board: "Arduino Uno"
sketch_apr29b.ino: In function 'void loop()':
sketch_apr29b.ino:13:27: error: 'fsrAnalogPin' was not declared in this scope
sketch_apr29b.ino: In function 'void rainbowCycle(uint8_t)':
sketch_apr29b.ino:29:77: error: 'Wheel' was not declared in this scope
Error compiling.
Code: Select all
#include <Adafruit_NeoPixel.h>
int fsrPin = 0;
int fsrReading;
void setup(void) {
Serial.begin(9600);
}
Adafruit_NeoPixel strip = Adafruit_NeoPixel(60, 6, NEO_GRB + NEO_KHZ800);
void loop() {
fsrReading = analogRead(fsrAnalogPin);
Serial.print("Analog reading = ");
Serial.println(fsrReading);
if (fsrReading > 240) // when pressure is greater than threshold
{
rainbowCycle(5); // rainbow cycle
}
}
void rainbowCycle(uint8_t wait) {
uint16_t i, j;
for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
}
}
Arduino: 1.6.3 (Windows 7), Board: "Arduino Uno"
sketch_apr29b.ino: In function 'void loop()':
sketch_apr29b.ino:13:27: error: 'fsrAnalogPin' was not declared in this scope
sketch_apr29b.ino: In function 'void rainbowCycle(uint8_t)':
sketch_apr29b.ino:29:77: error: 'Wheel' was not declared in this scope
Error compiling.
- adafruit_support_bill
- Posts: 88096
- Joined: Sat Feb 07, 2009 10:11 am
Re: fsr>neopixel strip
You have it declared as "fsrPin". Change one or the other so that they agree.sketch_apr29b.ino:13:27: error: 'fsrAnalogPin' was not declared in this scope
You will need to copy the Wheel function from strandTest into your sketch also.sketch_apr29b.ino:29:77: error: 'Wheel' was not declared in this scope
Please be positive and constructive with your questions and comments.