Cannot read value from Round Force Sensor FSR402

Archives GrovePi
1

Hi,

I wanted to read data from Round Force Sensor FSR402. Unfortunately on Grove wikipage there’s no sample code for Raspberry Pi & GrovePi+ but I found other analog sensor as a reference: Grove Gas Sensor MQ2. At the end of the day I created code like this:

import grovepi

sensor = 0
grovepi.pinMode(sensor, "INPUT")
print("AAA")
value = grovepi.analogRead(0)
print("BBB")

The output of this code is:
AAA

Probably analogRead is wating for a data and cannot get them. I plugged sensor into the A0 port. Could you please help me to figure this out?

2

Disclaimer: I am not DI and do not own a GrovePi

Perhaps compare to this sample (it looks like 14 for A0 rather than 0?). https://github.com/DexterInd/GrovePi/blob/master/Software/Python/grove_analog_read.py

3

Thanks for the link you provided. Unfortunately I can’t test this solution now because I burned my Raspberry week ago. I found a link on the web which confirms your theory - https://www.dexterindustries.com/GrovePi/engineering/port-description/

On an Arduino Uno (same ATmega328 chip) the digital pins are marked as D0-D13 and analog pins A0-A5 .
The analog pins are actually aliases for digital channels.
A0 = D14
A1 = D15
A2 = D16
A3 = D17
A4 = D18
A5 = D19

From the other hand in the “official documentation” for Grove Eagleye 530s (http://wiki.seeedstudio.com/Eagleye_530s/#play-with-grovepi) which is analog sensor you can find this code:

# Connect the Grove Rotary Angle Sensor to analog port A0
# SIG,NC,VCC,GND
potentiometer = 0

# Connect the LED to digital port D5
# SIG,NC,VCC,GND
led = 5

grovepi.pinMode(potentiometer,"INPUT")
grovepi.pinMode(led,"OUTPUT")

For sure without raspberry pi we cannot check those theories :slight_smile:

1 Like
4

Are you absolutely sure it is fried? There is a “self healing” thermal fuse somewhere in the power circuitry - I have heard of resurrected Raspberries :nerd_face: