Module TXD serial port RXD, Module RXD serial TXD, VCC 3.3V 5V must be burned, is the current increases, the phenomenon is chip ) VCC 3.3V 5V must be burned, is the current increase, chip ) Using the PC software can the error status of the module, such as measuring distance too tight, measured movements too quickly, or there is no reflection, reflection, such as error messages, Objects blocking the or lens, you can the fourth error. On the front of the module, one or two centimetres in the block, you can the first error, As long as the module can return data, response data, indicates the module is OK, Range when operating current, 120mAIf the is not working failure driver 110V, if the receiver part of the bad, you are prompted to receive failure Currently both a hard error, if no data is mostly lines connection problem or software problem, you can try to reset Measuring range: 0.05-40 m Measurement accuracy (standard deviation): 2.mm (10 m) 10 m formula 2+0.05* (D-10), and d is the distance Distance unit: m type: 620-690nm class: class , Less than 1mW (B-level security) Single measurement time: 0.25-1S(4HZ) Spot diameter at the distance m: 6mm@10m,30mm@50 Operating temperature: -10~+60 c Storage temperature: -20~+80 c Power supply voltage: DC3v-3.3v IO Voltage:TTL Level compatible 3v-5v Voltage In harsh environments such as:Sunlight is too strong, temperature fluctuations are too big,Relatively weak reflector,System voltage high/low,Measuring distance is near,The could be greater errors,Recommended to use with the in this case reflector Modules use the beyond the marked electrical range,Does not meet the required supply voltage can damage module, 5v IO Directly setto drive,If AVR Or STC Single-chip microcomputer,List of series 1K Ohm resistor. Material: plastic colour: black Package Contents: 1 x Sensor Range Finder Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.