1I have connected a square Adafruit Force Sensitive Resistor 406 up to a Raspberry Pi following the instructions given here: Using an FSR with a Raspberry Pi

I have wired everything up exactly as mentioned and used the code linked in the text.[Wiring Config]

However when I run the program the reading from the FSR is either 2047 or 0. It seems to make no difference whether I apply any force to the sensor.

I am wondering if you can give me advice on what could be causing this problem and how to resolve it?

  • Something is wired incorrectly.
    – joan
    Commented Jan 29, 2017 at 17:55
  • thanks for your comment, I have tried wiring direct to the pins and also via the breadboard but the same result each time. Could it be a possibility that the MCP3008 is faulty? I will need to buy a new analog component to test if this is the case
    – alkey
    Commented Jan 29, 2017 at 18:16
  • Yes,that is possible. Incorrect wiring is more likely. Have you wired without the cobbler? People connect the ribbon cable the wrong way around. You need to post a photo of your connections.
    – joan
    Commented Jan 29, 2017 at 18:19
  • I am pretty certain it is all wired up correctly, as I have tried with and without the cobbler. I have attached a picture of my wiring. Under the ribbon cable is a connection from the 3v3 to the live rail.
    – alkey
    Commented Jan 29, 2017 at 18:54
  • You need to show the actual text of the script you are using. Most people would use the dedicated SPI GPIO rather than bit-bang (the scripts pointed to are ancient in Pi terms).
    – joan
    Commented Jan 29, 2017 at 20:43

1 Answer 1


The code I copied from the linked pages is redundant. The most simple way of getting a reading using the MCP3008 with the FSR connected as illustrated above is as follows:

from gpiozero import MCP3008
from time import sleep
read = MCP3008(channel=0, device=0)

while True:
    readingVolts = read.value * 1000

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