DISCLAIMER: This tool is there to help you. It is not bulletproof and may be mistaken (false positive). But if it tells you that there is a wiring issue, you can be certain that there is indeed a hardware problem. The tool suggests a possibility but it can be something else.
Be also very careful and do not invert wires just to try. Reversing pins can damage the BLTouch and in the worst case, can also damage the motherboard of your printer.
This tool helps you detect problems with the wiring of a BLTouch. The first panel checks if the sensor is correctly powered:
- If your BLTouch is illuminated (with a red color), tap on Yes. Otherwise, tap No and the tool will tell you which wires to check.
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If your BLTouch is illuminated but blinks, tap on one of the two Yes buttons:
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If the red LED blinks slowly (20%), it means that the BLTouch itself has detected a wiring issue. The most common reason is when the +5V (red - VCC) and the ground (brown - GND) are reversed.
BE CAREFULL: reversing those two pins can damage the BLTouch and in the worst case, can also damage the motherboard of your printer. -
If the red LED blinks quickly (50%), it means that the BLTouch was not able to deploy its pin. Power off the printer, remove the USB cable and check the probe to see if it is not dirty. Try pulling the pin manually to see if it moves easily and freely.
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The next step helps you detect problems with the Servo (orange) wire of the BLTouch:
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If the pin deploys and stows itself, tap on Yes. Otherwise, tap No and the tool will tell you which wires to check.
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The next step helps you detect problems with the End-Stop part of the sensor. The pin should deploy, retract itself and then again deploy. Then the following panel is displayed:
As instructed, touch gently the pin and it should retract. If it is the case, try again gently or wait for the 30 seconds to elapse.
- At this stage, all the wires of the sensor have been tested and you get the kind of BLTouch detected (pre-3.1 or 3.1):
Even if everthing is green, it does not mean that there is no issue. It just means that this tool has not detected any issue.
- If there is something wrong, the tool tells you what to do. For example:
This is only a suggestion, the tool suggests a possibility but it can be something else.