From 60bd9c9b9cdb67d390e6de16b65c42e7c5baaad7 Mon Sep 17 00:00:00 2001 From: Justin Kruger <20767264@student.uwa.edu.au> Date: Sun, 4 Aug 2013 19:41:45 +0800 Subject: [PATCH] Testing git stuff Brief notes on sensor types --- notes/sensors notes - justin.txt | 37 ++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 notes/sensors notes - justin.txt diff --git a/notes/sensors notes - justin.txt b/notes/sensors notes - justin.txt new file mode 100644 index 0000000..e6bd836 --- /dev/null +++ b/notes/sensors notes - justin.txt @@ -0,0 +1,37 @@ +PRESSURE SENSORS + +- A cheap, pretty good pressure sensor in the range required is the MPX2202 manufactured by Freescale (costs about $15). +- For the system several will be needed? One or two inside the box, maybe a couple in the piping/pneumatics system. +- Sensor has 3 used pins: supply voltage, ground and output voltage, and one unused. +- Pressure is measured by the sensor and given as a scaled linear output voltage. +- Range of 0-40mV over 0-200kPa. +- Most Freescale sensors have analog output as far as I can tell. +- More expensive sensors are more accurate (with less error), which might be necessary for the project. +- Honeywell make the Truestability series which cost around $35. +- These have an amplified analog output, and resolution of 0.03%. +- Output voltage range is from 0 to the supply voltage (either 3.3V or 5.0V) +- Sensor has 3 used pins: supply voltage, ground and output voltage, and 4/8 pins total +- Pressure sensors which donft have pins (i.e. plug in via cables) are generally much more expensive and heavy-duty + +STRAIN GAUGES + +- Cheap strain gauges are available from Omega ($30-40 for a pack of 5) +- Input/output varies but it is generally a pair of solder pads or input leads. +- Voltage is applied to the input and a small voltage is read from the output, proportional to the strain. +- Analog output usually in the millivolt range. +- Number of leads/solder pads can vary, but most common is just one input wire and one output wire. +- Multiple strain gauges can be connected to a single epadf. +- For the coke can we shouldnft need more than one or two gauges (and maybe one to measure strain on the box for safety?). +- Micron also make strain gauges. +- Input and output are thin 1.5cm leads or small contact pads. Same type of analog, low voltage output. +- One input lead & one output lead. +- Strain gauges have different shapes (bar, U-shape, M-shape) which might change the number of wires etc, but it depends on what the sensors team chooses. + +REGULATORS + +- Electronic pressure regulators are made by Parker. +- Require 12-24V supply voltage, 0-5V input voltage, and 0-5V output voltage. +- Electrical connector has 8 contact pins: 5 for input, 2 for output, and one unused. +- Pins are absolute zero control, supply voltage, setpoint, valve current, signal common, pressure output and valve test voltage output. +- Emerson also make regulators that can accept both analog and digital inputs from a computer, and have can give an analog or digital output (with a single cable). +- These are more expensive though and I'm not sure what connector the cable has. -- 2.20.1