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--- soft-robotics:sensors:mps-20n004d0d [2019/02/16 16:25]
avnerus
+++ soft-robotics:sensors:mps-20n004d0d [2021/12/15 16:11] (current)
avnerus
@@ Line 5: / Line 5: @@
 ===== Description =====
-This is a cheap yet ubiquitous pressure sensor. Unlike the [[soft-robotics:sensors:mis-2500|MIS-2500]], it requires amplification using an Op-Amp.
+This is a cheap yet ubiquitous pressure sensor based om a Wheatstone bridge. Unlike the [[soft-robotics:sensors:mis-2500|MIS-2500]], it requires amplification using an Op-Amp.
+===== Datasheet =====
-==== Datasheet ====
 {{ :soft-robotics:sensors:mps20n0040d-s_datasheet.pdf |Download here.}}
+===== Circuit Design =====
+After plenty of reading and experimenting I came up with the following LM358 based circuit that I am satisfied with.
+==== Pinout ====
+This pin diagram is for the version of the sensor that I ordered.
+{{:soft-robotics:sensors:mps-pinout.png?400|}}
+==== Circuit ====
+The circuits I have seen online use two connections to the LM358, first as a differential amplifier and then as a normal amplifier.
+I believe that I can manage with just differential amplification, because it provides both amplification to the signal and eliminating the 2.5v offset of the output.
+**The following setup is for 3.3v on the Teensy**
+{{:soft-robotics:sensors:pressure_sensor_connection_avner.png?800|}}
+*Based on the image in "The answer is 42"
+==== Breadboard image ====
+{{:soft-robotics:sensors:breadboard_pressure_sensor.jpg?400|}}
+* I also added 100Uf capacitors because seems like that was recommended.
+==== Raspberry Pi Circuit ====
+To connect the pressure sensor to a Raspberry Pi, the ADS1115 board may be used.
+Below is a Fritzing image of the circuit:
+{{:soft-robotics:sensors:mps20n0040d_pressure_sensor_-_raspberry_pi_bb.png?400|}}
+The pressure is measured as a differential pressure, counting the difference between A0 and A1.
+The Fritzing sketch is available [[https://version.aalto.fi/gitlab/peleda1/puppetbots/-/blob/439b3ef9cbe7f46207e2e06fb6bcbe6fcdbf993c/prototype/fritzing/MPS20N0040D%20Pressure%20Sensor%20-%20Raspberry%20Pi.fzz|here]].

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