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by CosmoNerd
Sat May 05, 2018 1:28 pm
Forum: Beginners
Topic: Electrical Resistance Calculation Help
Replies: 61
Views: 5412

Re: Electrical Resistance Calculation Help

First an apology, my calculation was not quite correct. However, the good news is here is some corrected code: print("Conductance calculation demo") # Voltage values should be provided in volts, feed resistance value in kOhms def conductance(V_measured, cal_factor = 1.0, V_supply = 3.3, R_feed = 1.0...
by CosmoNerd
Thu May 03, 2018 1:59 pm
Forum: Beginners
Topic: Electrical Resistance Calculation Help
Replies: 61
Views: 5412

Re: Electrical Resistance Calculation Help

I have a 3.3V pin connected to a 1,000 Ohm resistor With pins touching, the voltage reading is: 3.227126v pins in drinking water: 1.05v~ pins in tap water: 1.915v~ Can someone help me with the calculation that results in the EC/PPM? Any suggested reading? I've been reading up on ohm's law. Using Oh...
by CosmoNerd
Thu May 03, 2018 12:46 pm
Forum: Beginners
Topic: Capabilities of the SPI1 interface
Replies: 0
Views: 210

Capabilities of the SPI1 interface

Hi all, I'm a complete beginner with the Pi trying to use it for testing another board. My problem is that I really need to do 16-bit SPI transfers and SPI0 is limited to 8/9 bit transfers. I'm bit-bashing the interface at the moment just to get started but while that's OK for transmitting as a mast...

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