I am in the other end of you canoe!
I did run across the below post will shed a littlt light!
By:Kraut 2017-04-24 08:27:31
I received my module and the measuring column is missing. The PCB on the back of the module has a 2 pin connector, a 3 pin connector, and two small pushbuttons. There are no instructions and the power supply that came with it does not have a connector that matches the connectors on the module so I am unable to use it.
Banggood Reply:
Dear Customer,
Thanks for your review.
1. The measuring column is less than 2cm long and very easy to be ignored in the package. Could you try to find it in the outside package bag?
2. The 3pin connector is PWM, the 2pin connector is TTL, the left side push button is used for switching PWM or TTL mode. The right side push botton is used for adjusting the power. Power supply is shown on our description.
3. About the matching connector ,we are consulting with our supplier to improve it.
If you have other product question, please feel free to contact our custoner service: cservice@banggood.com. We will solve it asap. Hope you can understand. Thank you very much.