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Strain Gauge Rosette RAW Bridge Output
04/20/2015 at 13:49 • 1 commentI tested the strain indicator unit with a rosette, next step would be calibrating the readings with a commercial strain indicator at college.
The readings shown on display are just the raw voltage from the Wheatstone bridges in milli-Volts, Later I'll add the rosette as well as the linear gauges equations to calculate strain using these readings, GF (gauge factor or sensitivity) which is dependant on gauge material/type and finally the orientation and bridge configuration (Full-Bridge / Quarter-Bridge).
In my case all the channels are quarter bridges with 120 Ohm SMD resistors.
Awaiting feedback =)
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PCB soldering & testing
04/14/2015 at 23:21 • 0 commentsHurrah!!!
I just finished soldering all of the components to the PCB and I found out I missed a track from Teensy's VIN to the VCC of the display and all I got was the backlight LED, after a little troubleshooting with the multimeter continuity mode and reviewing my designs I added a wire (the yellow one in the photos below) going from VCC to VIN and it worked!
Btw this is my 1st try with a hot air soldering station and it went great, I used it to solder the 120 Ohm SMD resistors on the board. The rest of the components were soldered using a normal iron.
Here are some photos along the way, enjoy!
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SeeedStudio's PCBs delivered!
04/14/2015 at 16:49 • 2 commentsJust received my PCBs from SeeedStudio Fusion PCB service, the finish and the silkscreen are great. This is my first order with them.
Here is a photo of the PCBs and next to it is the home made version (using photoresist method).