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Reddit mentions of Longruner 5X Geared Stepper Motor 28byj 48 Uln2003 5v Stepper Motor Uln2003 Driver Board with ArduinoIDE (no Wire)
Sentiment score: 1
Reddit mentions: 1
We found 1 Reddit mentions of Longruner 5X Geared Stepper Motor 28byj 48 Uln2003 5v Stepper Motor Uln2003 Driver Board with ArduinoIDE (no Wire). Here are the top ones.
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5pcs Stepper motor and driver board compatible with 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi.Stepper motor with a standard interface. A, B, C, D four-phase LED indicates the status of the stepper motor work.Motor diameter: 1.1 inches.Wire length：9.05 inchs. Stepping angle: 5.625 x 1/64.Reduction ratio: 1/6.Drive Module Board Size:1.26 inchsX1.38inchs. Cable length: about 20cm /8-inch.Great packing in a box : 5 set Uln2003 Stepper Motor + Driver Board.Good after-sales service.
Specs:
| Color | normal |
| Number of items | 5 |
| Release date | November 2018 |
| Size | no wire |
This might be bass-ackward but you could rig a small peristaltic pump to draw 5ml of water from the tank into a test tube, and another to drip-in the usual chemical test kit solution, then a webcam (or other optical sensor) to compare the color and produce a digital result. After testing, you would need to tip and flush the test tube a couple of times. It sounds like you would need 3 stepper motors, and these $2 ones might do the trick: https://www.amazon.com/Longruner-Stepper-Uln2003-arduino-LK67/dp/B015RQ97W8/ref=sr_1_4?keywords=stepper+motors&qid=1557919422&s=electronics&sr=1-4
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There are plans on Thingiverse for 3D-printed peristaltic pumps made from stepper motors and skate bearings.