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๐Ÿ” gaohou ph0-14 electrode detector for arduino logo

๐Ÿ” GAOHOU PH0-14 Electrode Detector for Arduino Review

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Revainrating 3 out of 5ย ย 
Ratingย 
3.0
๐Ÿ”ฌ Substance Analysis Instrumentation, ๐Ÿ” Test, Measure & Inspect

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Description of ๐Ÿ” GAOHOU PH0-14 Electrode Detector for Arduino

Response time:โ‰ค5S;Settling Time:โ‰ค60S;Component Power:โ‰ค0.5W;Detectable concentration range: PH0-14;Module Size: 42mmร—32mmร—20mm;Output: analog voltage signal output;With 4pcs M3 Mounting Holes. Getting the voltage varies on what you're using. The PH for this sensor is not at 0v for a PH7 it's around 2.51v from the multi-meter and PH4 at 3.03. If you calculate the step, 2.51-3.03 =-0.52. The difference between ph4.01 and PH7 is 2.99. If you're using a Particle product like the Photon or Argon, be aware of a bug. It's a hardware issue with the analog ports fluctuating a ghost voltage. This fluctuation is enough at these low voltages reading to make your ph sway by .7 or more. To fix this, you'll need to add a 0.1uF cap between the analog port your using and ground. This PH electrode probe must be calibrated with standard buffer solution before each use, and the electrode probe cannot be tested continuously for a long time, which will shorten its life. There are two trimmers on the circuit board. One of them is for offset adjustment (closest to BNC connector) accomplished by removing the Ph probe and shorting the BNC connector with a wire. The other trimmer is an upper limit threshold for the digital output pin.

Reviews

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Type of review

Revainrating 1 out of 5

Board illustrations inaccurate, sensor also defective

The board I received came with a printed board, there were two different illustrations and neither matched the board supplied. So it took trial and error to figure out which pins were which. The probe is also broken, hooked up to an oscilloscope without a board and measuring full voltage regardless of the solution. So much time wasted on these Revain products. I would tell myself to others: Pay 10x elsewhere (avoid Revain at all costs) and you'll save yourself money and a lot of troubleshooting

Pros
  • Robust construction
Cons
  • No machine

Revainrating 4 out of 5

The board seems to work, the probe seems to be broken

Of course, this kit comes without instructions. The instructions here show two different boards - the photo differs from the schematic (6 pins vs 7 pins). What I have is the 6 pin version. The silkscreen information on the plaque appears to be simple. The board powers up, but the sensor doesn't respond to the calibration solution and is stuck at 3.78V. After some additional fiddling (connecting and disconnecting the sensor), I've verified that the board is working - I suspect the sensor isโ€ฆ

Pros
  • Cool product
Cons
  • Something different

Revainrating 4 out of 5

Decent quality, no electrical isolation

I am using this probe in a hydroponic system with a Raspberry Pi and an Adafruit ADS-1015 ADC. Setup was quick and easy and the device works more or less as expected. I calibrated the system using linear regression on Atlas Scientific standards at pH 4.0, 7.0 and 10.0. My pH reading code takes samples from this device 50 times and returns the average value. I repeat this three times, taking the average of the median and rounding it up to the nearest tenth of the pH. One would expect the pH toโ€ฆ

Pros
  • Consistent test results
Cons
  • Could have chosen a newer model