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soft-robotics:sensors:mps-20n004d0d [2019/02/16 16:54] avnerus |
soft-robotics:sensors:mps-20n004d0d [2019/02/19 08:56] avnerus |
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===== Description ===== | ===== 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 ===== | ||
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===== Circuit Design ===== | ===== Circuit Design ===== | ||
- | After plenty of reading and experimenting I came up with the following circuit that I am satisfied with. | + | After plenty of reading and experimenting I came up with the following LM358 based circuit that I am satisfied with. |
==== Pinout ==== | ==== Pinout ==== | ||
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{{:soft-robotics:sensors:mps-pinout.png?400|}} | {{: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. | ||