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soft-robotics:sensors:mps-20n004d0d [2019/02/16 16:25] avnerus |
soft-robotics:sensors:mps-20n004d0d [2019/02/16 17:39] 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 ==== | ||
{{ :soft-robotics:sensors:mps20n0040d-s_datasheet.pdf |Download here.}} | {{ :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. | ||
+ | |||
+ | {{: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. | ||