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Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Motor shield  is a platform for robotics and mechanical applications based on L298P. It can be used to drive double DC motor or a 4-wire stepper. When controlling double DC motor, there are Only 4 control pins are used, which makes more easily to control, and saves the control pins for controller. The Drive current can be up to 2A per motor output for the adding of the heat sink. Measure the driver current by the additional resistance, makes the system more smartly. 

The requirements of wire cloth and wiring   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  In general, PCB multilayer board wiring is performed according to circuit function. In outer wiring, it is required to have a lot of wiring in the welding surface, and the components are less wiring, which is beneficial to the maintenance and platoon of printing plate. Thin, tight conductor and easily disturbed signal lines, usually arranged in the inner layer. The large area of copper foil should be evenly distributed in the outer layer, which will help to reduce the warping of the plate and make the plating more uniform on the surface. In order to prevent the short circuit between the surface and the printed wire and the mechanical processing, the distance of the conductive graph in the inner and outer layers should be greater than 50mil. Wire direction and line widt...

6. Basic requirement of designing multiple layer PCB       Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Determine out shape, size, layers. Any plate, there are problems with other structural parts, so the shape and size of the printing plate must be based on the product machine structure. However, in terms of production process, it should be as simple as possible, generally for the long width ratio not too wide of the rectangle, to facilitate assembly, improve production efficiency, lower labor cost. The number of layers must be based on the circuit performance, the size of the plate and the intensity of the line. In the case of PCB multilayer, the application of four layers and six laminates is the most widely used, with four layers as an example, which is two conductor layers (surface and welding surface), a power supply layer and a layer. Th...

Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  The SIM808 GPRS/GSM+GPS Shield V1.0 is based on the chip named SIM808, it communicates with Catduino Uno via pins (RX, TX) with GPS data and GPRS data. For the operate voltage could either at 3.3V or 5V, it can be totally compatible to the Arduino. It can be also used to making/answering call, sending/receiving SMS messages and local the position. By the way, SIM GPRS/GSM+GPS Shield V1.0 suppose an SIM card holder at the opposite side. http://juvtmall.com/sim808-btgsmgps-sheild_p0813.html

  Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Here, you can know the details:  http://juvtmall.com/simduino_p0814.html Contact me: ann@juvtmall.com