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STEMMA QT / Qwiic JST SH 4-Pin Cable - 400mm long
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SparkFun Qwiic Ecosystem
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This 4-wire cable is a little over 400mm / 15.7" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these ar...
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This 4-wire cable is a little over 400mm / 15.7" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
This cable can be used with Qwiic boards, to easily connect sensors and drivers to boards with 0.1" socket headers or to solder-less breadboards. When used with Qwiic the colors are:
- Red - 3.3VDC Power
- Black - Ground
- Blue - I2C SDA Data
- Yellow - I2C SCL Clock
We've interleaved the data wire with ground and power to reduce cross-talk, but note that this cable is long for an I2C connection, so you may have difficulty using it with 1MHz/800KHz or even 400KHz signals. Try lowering your I2C clock if you're getting connection or data issues.
Jargon buster
Plain-language definitions for the technical terms used above.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
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