Crowtail pH sensor 2.0: specs
A pH interface board from Elecrow (model CRT14016P) with a combined glass pH electrode on a BNC-style probe. It outputs an analog signal for the hydrogen-ion concentration that an Arduino reads on an analog pin. It connects through a 4-pin Crowtail connector, and the package includes one 4-pin Crowtail cable. Elecrow's own wiring uses a Crowtail Base Shield (not sold here); the cable's free-end connector and wire order are not documented.
Specs
| Spec | Value | Source |
|---|---|---|
| Model | CRT14016P | source Description |
| Measuring range | 0 to 14 pH | source Features; Specification table |
| Measuring temperature | 0 to 60 C | source Features; Specification table |
| Response time | Less than 2 minutes | source Features |
| Working voltage | 5 V | source Specification table |
| Output | Analog signal read on an analog pin (the wiki connects it to analog port A0 of a base shield through the Crowtail cable); output voltage range not given | source Specification table; Usage step 1 |
| Board dimensions | 58.8 mm x 20.0 mm x 27.0 mm | source Specification |
| Included in the box | Sensor board, 4-pin Crowtail cable, pH electrode | source Product page: Package list |
| Electrode | Combined glass electrode and reference electrode; full-screen type to reduce interference from external electric fields | source Product page: Description and Features |
Power
| Value | Source | |
|---|---|---|
| Supply | 5 V | source Specification table (no current figure is given) |
Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.
Elecrow connects the board to analog port A0 of a Crowtail base shield with a 4-pin Crowtail cable and gives no pin-by-pin table for it. The schematic archive on the wiki is labelled v1.0 and shows a 3-pin header, so it is not used as the pinout of this 2.0 module. Check the board's silkscreen before wiring.
Build with it
Project ideas for the Crowtail pH sensor 2.0. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.
- Uno pH readout: The board needs 5 V and the Uno provides it with a 5 V analog input. Learning project for comparing solutions, not for water safety or health decisions. Calibrate in a neutral solution first as Elecrow's wiki steps describe. Connection: the Uno has no Crowtail socket, so use the Crowtail cable that ships with the sensor (if the cable's far end is a plug, cut that connector off first), strip the free end and identify the 5 V, GND and signal wires with a meter against the board silkscreen before powering (Elecrow does not publish the wire order); Elecrow's wiki wires the signal to A0.
- pH and temperature logger: Elecrow gives a 0 to 60 C measuring range, so log temperature next to pH and keep the water inside that range. The DS18B20 needs a data pull-up resistor from the resistor pack of 4.7 kohm (check that your resistor pack contains that value). Learning project only. Connection: the Uno has no Crowtail socket, so use the Crowtail cable that ships with the sensor (if the cable's far end is a plug, cut that connector off first), strip the free end and identify the 5 V, GND and signal wires with a meter against the board silkscreen before powering (Elecrow does not publish the wire order); Elecrow's wiki wires the signal to A0.
- Spot-check notebook: Press the button after the reading settles (under 2 minutes) to record a time-stamped value on the OLED. A learning project for comparing samples, not a measurement for safety or health decisions. Connection: the Uno has no Crowtail socket, so use the Crowtail cable that ships with the sensor (if the cable's far end is a plug, cut that connector off first), strip the free end and identify the 5 V, GND and signal wires with a meter against the board silkscreen before powering (Elecrow does not publish the wire order); Elecrow's wiki wires the signal to A0.
Common mistakes
- Powering it from 3.3 V or driving a 3.3 V board's ADC from it: Elecrow specifies a 5 V working voltage and does not give the output range, so use a 5 V Arduino analog input unless you measure the output first (source: link, Specification)
- Using the example code unchanged: the sample sketch assumes a 4.95 V reference, an offset of 365 counts and 59.16 mV per pH unit, so check the reading in a neutral solution first and adjust the constants (source: link, Usage steps 3 to 5)
- Reading too soon: the response time is under 2 minutes, so wait for the reading to settle after moving the electrode between solutions (source: link, Features)
Not covered by the official source
- No current figure, output voltage range, accuracy or calibration-solution procedure is given.
- The wiki says the electrode's plastic guard can be used as a stirring rod, while the product page says it cannot, so no handling advice is given here.
- The wiki page is titled 'Crowtail- PH Sensor' and the schematic archive is labelled v1.0; no separate 2.0 document is available.
- The far end of the supplied Crowtail cable and its wire order are not documented; no Crowtail base shield is sold here.